EMISSION CONTROL
CONTENTS
| SPECIFICATIONS | 2 |
|---|---|
| General Specifications | 2 |
| Service Specifications | 2–2 |
| Sealants | 2–2 |
| SPECIAL TOOLS | 2–2 |
| SERVICE ADJUSTMENT PROCEDURES | 3 |
|
SERVICE ADJUSTMENT PROCEDURES
Emission Control Device Reference Table |
3
3 |
|
SERVICE ADJUSTMENT PROCEDURES
Emission Control Device Reference Table Component Layout |
3
3 4 |
|
SERVICE ADJUSTMENT PROCEDURES
Emission Control Device Reference Table Component Layout Vacuum Hose Piping Diagram |
3
3 4 8 |
| Cautions on Inspection | 11 |
|---|---|
| Crankcase Emission Control System <6G72 Engine> | 11 |
|
Crankcase Emission Control System
<6G74 Engine> 1 |
1-1 |
|
Crankcase Emission Control System
<4G64 Engine> |
12 |
| Evaporative Emission Control System | 13 |
| Exhaust Emission Control System | 15 |
| Catalytic Converter | 16 |
| Exhaust Gas Recirculation (EGR) System <4G64 Engine> | 16 |
|
Exhaust Gas Recirculation (EGR) System
<6G72 – 24 Valve Engine, 6G74 Engine) 1 |
8-1 |
|
Exhaust Gas Recirculation (EGR) System
<4D56 Engine> |
19 |
| Exhaust Gas Recirculation (EGR) System <4M40 Engine> | 25 |
E17AA--
SPECIFICATIONS GENERAL SPECIFICATIONS
6G72 Engine
| ltems | Name | Specifications |
|---|---|---|
|
Crankcase emission control sys-
tem |
Positive crankcase ventilation (PCV) valve |
Variable flow type
(Purpose: HC reduction) |
|
Evaporative emission
control system |
Canister
2-way valve Purge control solenoid valve |
Equipped
Equipped ON-OFF solenoid valve (Purpose: HC reduction) |
|
Exhaust emission control sys-
tem |
Air-fuel ratio control device-MPI sys-
tem |
Oxygen sensor feedback type
(Purpose: CO, HC, NOx reduction) |
| Catalytic converter |
Monolith type
(Purpose: CO, HC, NOx reduction) |
|
|
Exhaust gas recirculation system
<24 valve engine> EGR valve EGR solenoid |
Single type
Duty cycle type solenoid valve (Purpose: NOx reduction) |
6G74 Engine
| Items | Name | Specifications | |
|---|---|---|---|
| Crankcase emission control system | Positive crankcase ventilation (PCV) valve |
Variable flow type
(Purpose: HC reduction) |
|
|
Evaporative emission
control system |
Canister
2-way valve Purge control solenoid valve |
Equipped
Equipped ON-OFF solenoid valve (Purpose: CO, HC, NOx reduction) |
|
|
Exhaust emission control
system |
Air-fuel ratio control device-MPI
system |
Oxygen sensor feedback type
(Purpose: CO, HC, NOx reduction) |
|
| Catalytic converter |
Monolith type
(Purpose: CO, HC, NOx reduction) |
||
|
Exhaust gas recirculation system
EGR valve EGR solenoid |
Single type
Duty cycle type solenoid valve (Purpose: NOx reduction) |
||
17-2
E17CA---
4G64 Engine
| Items | Name | Specifications |
|---|---|---|
|
Crankcase emission control sys-
tem |
Positive crankcase ventilation (PCV) valve |
Variable flow type
(Purpose: HC reduction) |
|
Evaporative emission
control system |
Canister
2-way valve Purge control solenoid valve |
Equipped
Equipped ON-OFF solenoid valve (Purpose: HC reduction) |
| Exhaust emission control system | Air-fuel ratio control device-MPI system |
Oxygen sensor feedback type
(Purpose: CO, HC, NOx reduction) |
| Catalytic converter |
Monolith type
(Purpose: CO, HC, NOx reduction) |
|
|
Exhaust gas recirculation system
EGR valve Thermo valve |
Single type
Bimetal type (Purpose: NOx reduction) |
4D56 Engine
| Item | Name | Specifications |
|---|---|---|
| Evaporative emission control system | 2-way valve | Equipped |
|
Exhaust emission control sys-
tem |
Exhaust gas recirculation system
EGR valve EGR control solenoid valve |
Single type
ON-OFF and duty solenoid valve (Purpose: NOx reduction) |
4M40 Engine
| ltems | Name | Specifications | |
|---|---|---|---|
| Exhaust emission control system |
Exhaust gas recirculation system
EGR valve EGR control solenoid valve |
Single type
ON-OFF and duty solenoid valve |
|
SERVICE SPECIFICATIONS
| ltems | Specifications | |
|---|---|---|
| <6G72, 6G74 Engine> | ||
|
Purge control solenoid valve coil resistance
[at 20°C (68°F)] |
Ω | 36 – 44 |
|
EGR solenoid valve coil resistance
[at 20°C (68°F)] |
Ω | 36 – 44 |
| <4G64 Engine> | ||
| EGR valve opening vacuum | mmHg (in. Hg) | 30 (1.2) |
| Thermo valve opening temperature | °C (°F) | 65 (149) |
| <4D56, 4M40 Engine> | ||
| EGR control solenoid valve | ||
| No. 1 and No. 2 resistance [at 20°C (68°F) | ] Ω | 36 – 44 |
| Lever position sensor output voltage | V | |
| Idle position | 0.3 – 1.5 | |
| Fully open | 3.7 – 4.9 | |
| Speed sensor resistance | kΩ | 1.3 – 1.9 |
|
Engine coolant temperature sensor resistance
[at 20°C (68°F)] [at 80°C (176°F)] |
e kΩ |
3.3
0.3 |
SEALANTS
| Items | Specified sealant | Quantity |
|---|---|---|
| Thermo valve thread |
3M Nut Locking
Part No. 4171 or equivalent |
As required |
SPECIAL TOOLS
| Тооі | Number | Name | Use |
|---|---|---|---|
| MD998478 | Test harness | Lever position sensor check |
E17CB--
E17CE--
SERVICE ADJUSTMENT PROCEDURES
EMISSION CONTROL DEVICE REFERENCE TABLE
6G72 Engine
| Emission control system |
Crankcase
emission control |
Evaporative
emission control |
Air fuel ra-
tio control |
Catalytic converter |
Exhaust
emission control |
Reference
page for each part |
|---|---|---|---|---|---|---|
| Related parts | system | system | system | system | inspection | |
| PCV valve | × | 17-11 | ||||
| Purge control solenoid valve | × | 17-14 | ||||
| 2-way valve | × | 17-15 | ||||
| MPI system component | × | × |
Fuel
(Group 13) |
|||
|
EGR control solenoid valve
<24valve engine> |
× | 17-18-3 | ||||
| Catalytic converter | × | 17-16 |
6G74 Engine
|
Emission control system
Related parts |
Crankcase
emission control system |
Evaporative
emission control system |
Air fuel
ratio control system |
Catalytic
converter |
Exhaust
emission control system |
Reference
page for each part inspection |
|---|---|---|---|---|---|---|
| PCV valve | × | 17-11-1 | ||||
| Purge control solenoid valve | × | 17-14 | ||||
| 2-way valve | × | 17-15 | ||||
| MPI system component | × | × |
Fuel
(Group 13) |
|||
| EGR control solenoid valve | × | 17-18-3 | ||||
| Catalytic converter | × | 17-16 |
E17FDAF
4G64 Engine
|
Emission control system
Related parts |
Crankcase
emission control system |
Evaporative
emission control system |
Air fuel
ratio control system |
Catalytic
converter |
Exhaust
emission control system |
Reference
page for each part inspection |
|---|---|---|---|---|---|---|
| PCV valve | × | 17-12 | ||||
| Purge control solenoid valve | × | 17-14 | ||||
| 2-way valve | × | 17-15 | ||||
| MPI system component | × | × |
Fuel
(Group 13) |
|||
| Catalytic converter | - | × | 17-16 | |||
| EGR valve | × | 17-17 | ||||
| Thermo valve | × | 17-18 |
4D56 Engine
| Emission Control system | Evaporative emission control system |
Exhaust emission con-
trol system |
Reference page for each part inspection |
|---|---|---|---|
| Related parts | , | ||
| 2–way valve | х | 17–15 | |
| EGR valve | × | 17–19 | |
| EGR solenoid valve No. 1/No. 2 | х | 17–19 | |
| Lever position sensor | х | 17–20 | |
| Engine speed sensor | X | 17–21 | |
|
Engine coolant temperature sen-
sor |
х | 17–21 |
4M40 Engine
| Emission control system | Evaporative emission control system | Exhaust emission control system | Reference page for each part inspection |
|---|---|---|---|
| Related parts | |||
| 2-way valve | × | 17-15 | |
| EGR valve | × | 17-25 | |
| EGR solenoid valve No. 1/No. 2 | × | 17-25 | |
| Lever position sensor | × | 17-26 | |
| Engine speed sensor | × | 17-27 | |
| Engine coolant temperature sensor | × | 17-27 |
COMPONENT LAYOUT
6G72 – 12Valve Engine
| Parts name | Symbol |
|---|---|
| Canister | А |
| Catalytic converter | В |
| PCV valve | С |
| Purge control solenoid valve | D |
| 2-way valve | E |
6G72 – 24Valve Engine
7EM0348
| Parts name | Symbol |
|---|---|
| Canister | Е |
| Catalytic converter | F |
| EGR valve | А |
| PCV valve | В |
| Purge control solenoid valve | D |
| EGR control solenoid valve | С |
| 2-way valve | G |
© Mitsubishi Motors Corporation Jun. 1994
EMISSION CONTROL – Service Adjustment Procedures
17-5-3 EMISSION CONTROL – Service Adjustment Procedures
6G74 Engine
© Mitsubishi Motors Corporation Jun. 1994
17-6
4G64 Engine
| Parts name | Symbol |
|---|---|
| Canister | А |
| Catalytic converter | В |
| EGR valve | С |
| PCV valve | D |
| Purge control solenoid valve | Е |
| Thermo valve | F |
| 2-way valve | G |
Mitsubishi Motors Corporation Feb. 1991
VACUUM HOSE PIPING DIAGRAM
6G72 – 12Valve Engine
E17
6G72 – 24Valve Engine
© Mitsubishi Motors Corporation Jun. 1994
Light blue Red Yellow
17-8-2
6G74 Engine
4G64 Engine
17-8-4
NOTES
VACUUM HOSE LAYOUT
6G72 – 24Valve Engine
17-10
6G74 Engine
CAUTIONS ON INSPECTION
17-11
E17FFAE2
- 1. Inspect the various devices only after completing engine adjustment.
- Inspect the hoses to make sure there are no disconnections, connection erros or damage.
- 3. Make sure there is no hose, pipe or port clogging, or cracks or damage in the hoses and pipes.
- When replacing device hoses, always mount the replacement hose in the same position (direction) as the original.
- When finished, check the connections as described in the service manual or service label.
CRANKCASE EMISSION CONTROL SYSTEM <6G72 Engine>
E17FAAN1
7EM0202
© Mitsubishi Motors Corporation Jun. 199
POSITIVE CRANKCASE VENTILATION SYSTEM <12Valve Engine>
System Inspection
- (1) Disconnect the ventilation hose from the air-intake plenum, and connect a hand vacuum pump to the ventilation hose.
- (2) At this time, make sure that there is leakage when vacuum is applied. If there is no leakage when vacuum is applied, either clean the positive crankcase ventilation valve or replace it.
Positive Crankcase Ventilation (PCV) Valve Inspection
- (1) Insert a thin rod from the nipple side of the positive crankcase ventilation valve, and move it back and forth to check that the plunger moves.
- (2) If the plunger does not move, there is a blockage inside the positive crankcase ventilation valve, so clean the valve or replace it.
PWJE9086-F
REVISED
17-11-1
POSITIVE CRANKCASE VENTILATION SYSTEM <24Valve Engine>
System Inspection
- (1) Disconnect the ventilation hose from the positive crankcase ventilation (PCV) valve.
- (2) Remove the PCV valve from the rocker cover.
- (3) Install the PCV valve to the ventilation valve again.
- (4) Start the engine and let it run at idle.
- (5) Plug the PCV valve by your finger and check that intake manifold vacuum can be felt.
NOTE
The plunger in the PCV valve moves back and forth at this time.
(6) If vacuum can not be felt, clean or replace the PCV valve.
Positive Crankcase Ventilation (PCV) Valve Inspection
- (1) Remove the air intake plenum.
- (2) Remove the positive crankcase ventilation valve from the rocker cover.
- (3) Insert a thin rod from the threaded side of the positive crankcase ventilation valve, and move it back and forth to check that the plunger moves.
- (4) If the plunger does not move, there is a blockage inside the positive crankcase ventilation valve, so clean the valve or replace it.
CRANKCASE EMISSION CONTROL SYSTEM <6G74 Engine>
POSITIVE CRANKCASE VENTILATION SYSTEM
System Inspection
- (1) Disconnect the ventilation hose from the rocker cover.
- (2) Start the engine and run it at idle.
- (3) Put a finger to the ventilation hose to make sure that intake manifold vacuum is felt on the finger.
NOTE
At this time, the plunger inside the positive crankcase ventilation valve moves back and forth.
- (4) If vacuum is not felt on finger, clean the positive crankcase ventilation valve in cleaning solvent or replace if necessary.
- (5) Tighten the positive crankcase ventilation valve to the specified torque.
Tightening torque: 9.8 Nm (1.0 kgm, 7ft.lbs.)
Positive Crankcase Ventilation (PCV) Valve Inspection
- (1) Remove the air intake plenum.
- (2) Remove the positive crankcase ventilation valve from the rocker cover.
- (3) Insert a thin rod from the threaded side of the positive crankcase ventilation valve, and move it back and forth to check that the plunger moves.
- (4) If the plunger does not move, there is a blockage inside the positive crankcase ventilation valve, so clean the valve or replace it.
CRANKCASE EMISSION CONTROL SYSTEM
E17FAAN2
POSITIVE CRANKCASE VENTILATION SYSTEM
System Inspection
- (1) Disconnect the ventilation hose from the positive crankcase ventilation valve. Then, remove the positive crankcase ventilation valve from the rocker cover and reconnect it to the ventilation hose.
- (2) Idle the engine and put a finger to the open end of positive crankcase ventilation valve to make sure that intake manifold vacuum is felt on the finger.
NOTE
At this time, the plunger inside the positive crankcase ventilation valve moves back and forth.
(3) If vacuum is not felt on finger, clean the positive crankcase ventilation valve and ventilation hose in cleaning solvent or replace if necessary.
Positive Crankcase Ventilation (PCV) Valve Inspection
- (1) Insert a thin stick into the positive crankcase ventilation valve from the threaded side to check that the plunger moves.
- (2) If the plunger does not move, the positive crankcase ventilation valve is clogged. Clean it or replace.
EVAPORATIVE EMISSION CONTROL SYSTEM
E17FBBA
© Mitsubishi Motors Corporation
Dec. 1993
INSPECTION
- (1) Disconnect the vacuum hose (red stripes) from the throttle body and connect it to a hand vacuum pump.
- (2) Plug the nipple from which the vacuum hose was removed.
- (3) Check the following points when the engine is cold [coolant temperature at 40°C (104°F) or below] and when it is warm [coolant temperature at 80°C (176°F) or higher].
When engine is cold
|
Engine operating condi-
tion |
Applying vacuum | Result |
|---|---|---|
| Idling |
400 mmHg
(15.7 in.Hg.) |
Vacuum is
maintained |
| 3,000 r/min. |
When engine is warm
|
Engine operating condi-
tion |
Applying vacuum | Result |
|---|---|---|
| ldling |
400 mmHg
(15.7 in.Hg.) |
Vacuum is maintained |
|
Within 3 minutes after
engine start 3,000 r/min. |
Try applying
vacuum |
Vacuum leaks |
|
After 3 minutes have
passed after engine start 3,000 r/min. |
400 mmHg
(15.7 in.Hg.) |
Vacuum will be main-
tained momentarily, after which it will leak. NOTE The vacuum will leak continuously if the alti- tude is 2,200 m (7,200 ft.) or higher, or the intake air temperature is 50°C (122°F) or high- er. |
PWJE9086-E
Vehicles built up to May, 1992 Engine speed (r/min.) SFU262
© Mitsubishi Motors Corporation Dec. 1993
Purge Port Vacuum Inspection
Check Condition
Engine coolant temperature: 80-95°C (176-205°F)
(1) Disconnect the vacuum hose (red) from the throttle body purge hose nipple and connect a hand vacuum pump to the nipple.
(2) Vehicles built up to May, 1992
Start the engine and check to see that, after raising the engine speed by racing the engine, vacuum remains fairly constant.
NOTE
If there is no vacuum created, it is possible that the throttle body port may be clogged and require cleaning.
Vehicles built from June, 1992
Start the engine and check to see that, after raising the engine speed by racing the engine, vacuum raises proportionately with the rise in engine speed.
IOTE
If there is a problem with the change in vacuum, it is possible that the throttle body port may be clogged and require cleaning.
PWJE9086-E
Purge Control Solenoid Valve Inspection
NOTE
When disconnecting the vacuum hose, make an identification mark on it so that it can be reconnected to the original position.
- (1) Disconnect the vacuum hose (black with red stripe) from the solenoid valve.
- (2) Disconnect the harness connector.
- (3) Connect a hand vacuum pump to the nipple to which the red-striped vacuum hose was connected.
- (4) Apply a vacuum and check for air-tightness when voltage is applied directly to the purge-control solenoid valve and when the voltage is discontinued.
| Battery voltage | Normal condition |
|---|---|
| When applied | Vacuum leaks |
| When discontinued | Vacuum is maintained |
(5) Measure the resistance between the terminals of the solenoid valve.
Standard value: 36–44 [at 20°C (68°F)]
SIMPLE CHECKING OF THE TWO-WAY VALVE
Attach a clean hose and check the operation of the two-way valve.
| Inspection procedure | Normal condition |
|---|---|
| Lightly blow from inlet side (fuel tank side). | Air passes through with a slight feeling of resistance. |
| Lightly blow from outlet side (canister side). | Air passes through. |
AIR FLOW SENSOR, ENGINE COOLANT TEMPERATURE SENSOR AND INTAKE AIR TEMPERATURE SENSOR IN-SPECTION
Refer to GROUP 13.
CANISTER INSPECTION
Refer to GROUP 13.
EXHAUST EMISSION CONTROL SYSTEM E17FCBL AIR FUEL RATIO CONTROL SYSTEM
- To inspect the air-fuel ratio control system, refer to GROUP 13.
- For detailed information concerning the illumination pattern of the malfunction-indicator light and other aspects of the self-diagnosis function, refer to GROUP 13
CATALYTIC CONVERTER REMOVAL AND INSTALLATION
E17YA--
For removal and installation procedures, refer to GROUP 15. INSPECTION E17YCAC
Check for damage, cracks or fusion and replace if faulty. Caution
- 1. Operation of any type, including idling, should be avoided if engine misfiring occurs. Under this condition the exhaust system will operate at abnormally high temperature, which may cause damage to the catalytic converter or under-body parts of the vehicle.
- 2. Alteration or deterioration of ignition or fuel system, or any type of operating condition which result in engine misfiring must be corrected to avoid overheating the catalytic converters.
- 3. Proper maintenance and tune-up according to manufacturer's specifications should be made to correct the conditions as soon as possible.
EXHAUST GAS RECIRCULATION (EGR) SYSTEM <4G64 Engine> System Inspection
6EM0160
- (1) Disconnect the vacuum hose (green stripe) from the throttle body, and connect a hand vacuum pump to the vacuum hose.
- (2) Under the engine conditions described below, provide a vacuum by using the hand vacuum pump, and then check.
When Engine is Cold– Coolant temperature at 40°C (104°F) or below
|
Engine operating condi-
tion |
Applying vacuum | Result |
|---|---|---|
| Idling | Try applying vacuum | Vacuum leaks |
When Engine is Hot-
Coolant temperature at 80°C (176°F) or higher
|
Engine operating condi-
tion |
Applying vacuum | Result |
|---|---|---|
| Idling |
30 mmHg
(1.2 in.Hg.) |
Vacuum is maintained |
| Changes from idling to slightly unstable |
195 mmHg
(7.7 in.Hg.) |
Vacuum is maintained |
Check Condition Engine coolant temperature: 80–95°C (176–205°F) (1) Disconnect the vacuum hose (green) from the
EGR Valve Control Vacuum Inspection
(1) Disconnect the vacuum hose (green) from the throttle body EGR vacuum nipple and connect a hand vacuum pump to the nipple.
(2) Start the engine and check to see that, after raising the engine speed by racing the engine, the vacuum raises proportionately with the rise in engine speed.
NOTE
If there is a problem with the change in vacuum, it is possible that the throttle body vacuum port may be clogged and require cleaning.
EGR Valve Inspection
-
Remove the EGR valve and check it for sticking, deposit of carbon, etc.
- If such condition exists, clean with adequate solvent to ensure tight valve seat contact.
- (2) Connect a hand vacuum pump to the EGR valve.
- (3) Apply a vacuum of 500 mmHg (19.6 in.Hg.) and check air tightness.
- (4) Blow in air from one passage of the EGR to check condition as follows.
| Applying vacuum | Result |
|---|---|
| 30 mmHg (1.2 in.Hg.) | Air does not blow through |
| 195 mmHg (7.7 in.Hg.) | Air blows through |
INSTALLATION
(1) Install a new gasket and EGR valve, tighten bolts to specified torque.
Specified tightening torque: 22 Nm (2.2 kgm, 16 ft.lbs.)
Thermo Valve Inspection
- (1) Disconnect the vacuum hoses from the thermo valve, and connect a hand vacuum pump to nipple of the thermo valve.
- (2) Apply a vacuum and check the air passage through the thermo valve.
| Engine coolant temperature | Result |
|---|---|
| 50°C (122°F) or less | Vacuum leaks. |
| 80°C (176°F) or more | Vacuum is maintained. |
REMOVAL
- (1) When removing the thermo valve, do not use wrenches or other tools on the resin part.
- (2) When disconnecting the vacuum hose, put a mark on the hose so that it may be reconnected at original position.
INSTALLATION
(1) Apply specified sealant to the threads of thermo valve and tighten to the specified torque. When installing the thermo valve, do not use wrenches or other tools on the resin part.
Specified sealant:
3M NUT Locking No. 4171 or equivalent Specified torque: 30 Nm (3.0 kgm, 22 ft.lbs.)
(2) Reconnect the vacuum, hose as it was before.
EXHAUST GAS RECIRCULATION (EGR) SYSTEM
<6G72 – 24Valve Engine, 6G74 Engine> System Inspection
© Mitsubishi Motors Corporation Jun. 1994
- (1) Disconnect the vacuum hose (green stripe) from the exhaust gas recirculation (EGR) valve, and then connect a hand vacuum pump via the three-way terminal.
- (2) Check the following points when the engine is cold [engine coolant temperature is 40°C (104°F) or below] and when the engine is warm [engine coolant temperature is 80°C (176°F) or higher].
When engine is cold
| Engine condition | Normal condition |
|---|---|
| Press the accelerator pedal suddenly and race the engine. |
Vacuum: no change
(atmospheric pressure) |
When engine is warm
| Engine condition | Normal condition |
|---|---|
| Press the accelerator pedal suddenly and race the engine. |
Vacuum rises temporarily to
100 mmHg (3.9 in. Hg) |
PWJE9086-F
- (3) Disconnect the three-way terminal and connect the hand vacuum pump directly to the EGR valve.
- (4) Check whether or not the engine stalls or shows idling instability when a negative pressure (vacuum) of 230 mmHg (9.1 in. Hg) or higher is applied during idling.
EGR Valve Control Vacuum Inspection Check Condition
Engine coolant temperature: 80-95°C (176-205°F)
(1) Disconnect the vacuum hose (green) from the throttle body EGR vacuum nipple and connect a hand vacuum pump to the nipple.
If there is a problem with the change in vacuum, it is possible that the throttle body vacuum port may be clogged and require cleaning.
Engine speed (r/min.)
1FU44
Acuum
EGR Valve Inspection
- (1) Remove the EGR valve and check if for sticking, deposit of carbon, etc.
- If such condition exists, clean with adequate solvent to ensure tight valve seat contact.
- (2) Connect a hand vacuum pump to the EGR valve.
- (3) Apply a vacuum of 500 mmHg (19.7 in. Hg) and check air tightness.
- (4) Blow in air from one passage of the EGR to check condition as follows:
| Applying vacuum | Result |
|---|---|
| 30 mmHg (1.2 in. Hg) or less | Air does not blow through |
|
230 mmHg (9.1 in. Hg) or
more |
Air blows through |
INSTALLATION
(1) Install a new gasket and EGR valve, tighten bolts to specified torque.
Specified tightening torque: 22 Nm (2.2 kgm, 16ft.lbs.)
EGR Control Solenoid Valve Inspection
NOTE
When disconnecting the vacuum hose, always make a mark so that it can be reconnected at original position.
- 1. Disconnect the vacuum hose (yellow stripe, green stripe) from the solenoid valve.
- 2. Disconnect the harness connector.
- 3. Connect a hand vacuum pump to the nipple to which the green-striped vacuum hose was connected.
- 4. Check airtightness by applying a vacuum with voltage applied directly from the battery to the EGR control solenoid valve and without applying voltage.
| Battery voltage | Normal condition |
|---|---|
| Not applied | Vacuum leaks |
| Applied | Vacuum maintained |
5. Measure the resistance between the terminals of the solenoid valve.
Standard value: 36–44Ω (at 20°C)
© Mitsubishi Motors Corporation Jun. 1994
17-18-4
NOTES
EXHAUST GAS RECIRCULATION (EGR) SYSTEM <4D56 Engine>
System Inspection
DEM0603
FUNCTION INSPECTION
- (1) Start the engine and let it warm up until the engine coolant temperature is 65°C (149°F) or above.
- (2) When the engine is raced by suddenly depressing the accelerator pedal, check to be sure that the diaphragm of the EGR valve lifts.
EGR SOLENOID VALVE NO.1/NO.2 OPERATION INSPECTION
- (1) Remove the EGR solenoid valve No.1/No.2 connectors and vacuum hoses.
- (2) Attach a vacuum pump to each nipple of the EGR solenoid valve No.1/No.2 and apply a vacuum. Check that the valves are airtight both when voltage is applied to each terminal of the EGR solenoid valves and when it is not applied.
DEMODIA
EGR SOLENOID VALVE No.1
| Battery voltage | Normal condition |
|---|---|
| When current is flowing |
Vacuum leaks
(Vacuum is maintained when nipple B is covered) |
|
When current is not
flowing |
Vacuum is maintained |
EGR SOLENOID VALVE No.2
| Battery voltage | Normal condition |
|---|---|
| When current is flowing |
Vacuum leaks
(Vacuum is maintained when nipple ① is covered) |
|
When current is not
flowing |
Vacuum leaks
(Vacuum is maintained when nipple (E) is covered) |
EGR SOLENOID VALVE NO.1/NO.2 RESISTANCE INSPECTION
Measure the coil resistances of the EGR solenoid valve No.1 and No.2 with a circuit tester.
Standard value [At 20°C (68°F)]: 36–44Ω
LEVER POSITION SENSOR (LPS) ADJUSTMENT [Condition before adjustment]
- Engine coolant temperature 80–95°C (176–203°F)
- (1) Loosen the accelerator cable tension sufficiently.
- (2) Connect the special tool (MD998478) to the lever position sensor connector as shown in the illustration.
- (3) Connect a digital-type voltmeter between the red clip (output) and blue clip (earth) of the connected special tool.
- (4) Turn the ignition switch to ON. (Do not start the engine.)
- (5) Measure the output voltage of the lever position sensor.
Standard value:
| Lever condition | Voltage V |
|---|---|
| Idle position | 0.3 – 1.5 |
| Fully open | 3.7 – 4.9 |
If the resistance differs largely from the standard value, replace the engine coolant temperature sensor.
(3) After applying specified sealant to the thread, tighten to the specified torque.
Specified sealant: 3M Nut Locking Part No. 4171 or equivalent
Tightening torque: 10–12 Nm (1.0–1.2 kgm, 7–9 ft.lbs.)
GLOW AND EGR CONTROL UNIT <SUPER QUICK GLOW SYSTEM>
TERMINAL VOLTAGE MEASUREMENT
NOTE
- (1) Inspect with the glow & EGR control unit connectors still connected.
- (2) When measuring the voltage, the earth will be the glow & EGR unit terminal no. 30.
Terminal Voltage Reference Table
|
Glow & EGR
control unit inspection terminal |
Inspection item | Inspection conditions |
Standard
value |
|
|---|---|---|---|---|
| Ignition switc | h: OFF → ON | 11 – 13V | ||
| 2 | EGR solenoid valve No.1 | While engine suddenly race |
is idling after having warmed up,
the engine. |
Momentarily
increases |
|
3 Lever position sensor Switch:
OFF → C |
Ignition | Throttle lever idle position | 0.3 – 1.5V | |
| 3 |
switch:
OFF → ON |
Throttle lever fully open position | 3.7 – 4.9V | |
| 5 |
Sensor power supply
|
Ignition switch: OFF → ON | 4.5 – 5.5V | |
| Ignition swite | h: OFF → ON | 11 – 13V | ||
| 8 EGR solenoid valve No.2 | While engine suddenly race |
is idling after having warmed up,
the engine. |
Momentarily
decreases |
|
HARNESS CONTINUITY INSPECTION
(1) Disconnect the glow & EGR control unit connector.
(2) Check to be sure that there is continuity (1.3 – 1.9 kΩ) between the harness-side connector terminals 10 – 11.
© Mitsubishi Motors Corporation Jun. 1994
PWJE9086-F
GLOW AND EGR CONTROL UNIT <SELF-REGULATING GLOW SYSTEM>
<From 1994 models>
DEM0025
TERMINAL VOLTAGE MEASUREMENT
NOTE
- (1) Inspect with the glow and EGR control unit connectors still connected.
- (2) Connect the earth to terminal No. 26 of the glow and EGR control terminal when measuring the voltage.
Terminal Voltage Table
|
Glow and EGR
control unit inspection terminal |
nspection item | Inspection condition | Standard value | |
|---|---|---|---|---|
| 3 | EGR solenoid valve No.1 | Ignition switch: OFF → ON | 11–13V | |
| While engine is idling after having warmed up, suddenly depress the accelerator pedal. | Momentarily increases | |||
| 6 | Lever position sensor |
Ignition switch
OFF → ON |
Throttle lever idle position | 0.3-1.5V |
| Throttle lever fully open position | 3.7-4.9V | |||
| 7 | Sensor power supply | Ignition switch: OFF → ON | 4.5-5.5V | |
| 16 | EGR solenoid valve No. 2 | Ignition switch: OFF → ON | 11–13V | |
| While engine is idling after having warmed up, suddenly depress the accelerator pedal. |
Momentarily
decreases |
|||
17-24
HARNESS CONTINUITY INSPECTION
- (1) Disconnect the glow and EGR control unit connectors.
- (2) Check to be sure that there is continuity (1.3-1.9Ω)
- between the harness side connector terminals (11)–(24).
EXHAUST GAS RECIRCULATION (EGR) SYSTEM <4M40 Engine>
System Inspection
DEM0603
FUNCTION INSPECTION
- (1) Start the engine and let it warm up until the engine coolant temperature is 65°C (149°F) or above.
- (2) When the engine is raced by suddenly depressing the accelerator pedal, check to be sure that the diaphragm of the EGR valve lifts.
EGR SOLENOID VALVE NO. 1/NO. 2 OPERATION IN-SPECTION
- (1) Remove the EGR solenoid valve No.1/No.2 connectors and vacuum hoses.
- (2) Attach a vacuum pump to each nipple of the EGR solenoid valve No. 1/No. 2 and apply a vacuum. Check that the valves are airtight both when voltage is applied to each terminal of the EGR solenoid valves and when it is not applied.
DEM0613
DEM0020
EGR SOLENOID VALVE NO. 1
| Battery voltage | Normal condition |
|---|---|
| When current is flowing |
Vacuum leaks
(Vacuum is maintained when nipple B is covered) |
| When current is not flowing | Vacuum is maintained |
EGR SOLENOID VALVE NO. 2
| Battery voltage | Normal condition |
|---|---|
| When current is flowing |
Vacuum leaks
(Vacuum is maintained when nipple D is covered) |
| When current is not flowing |
Vacuum leaks
(Vacuum is maintained when nipple E is covered) |
EGR SOLENOID VALVE NO. 1/NO. 2 RESISTANCE IN-SPECTION
(1) Measure the coil resistances of the EGR solenoid valve No.1/No. 2 with a circuit tester.
| Solenoid valve No.1/No.2 resistance | |
|---|---|
|
Standard value
[At 20°C (68°F)] |
36–44 Ω |
LEVER POSITION SENSOR (LPS) ADJUSTMENT [Condition before adjustment]
- Engine coolant temperature 80–95°C (176–203°F)
- (1) Loosen the accelerator cable tension sufficiently.
- (2) Connect the special tool (MD998478) to the lever position sensor connector shown in the illustration.
- (3) Connect a digital-type voltmeter between the red clip (output) and blue clip (earth) to which the special tool has been connected.
- (4) Turn the ignition switch to ON. (Do not start the engine.)
- (5) Measure the output voltage of the lever position sensor.Standard value:
| Lever condition | Voltage V |
|---|---|
| Idle position | 0.3–1.5 |
| Fully open | 3.7–4.9 |
If the resistance differs largely from the standard value, replace the engine coolant temperature sensor.
17-28 EMISSION CONTROL – Service Adjustment Procedures
GLOW AND EGR CONTROL UNIT
Refer to P.17-23
HARNESS CONTINUITY INSPECTION
Refer to P.17-24
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