Honda Accord 2001 LX Coupe V6 3.0L Workshop Manual

honda :: Honda Accord LX Coupe V6-3.0L (2001)

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm/Immobilizer Control Unit <--> [Alarm Module, (Vehicle Antitheft)] > Component Information > Locations

Alarm/Immobilizer Control Unit: Locations

97. Back Of Driver's Dashboard Lower Cover

89. Right Side Of Steering Column

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm/Immobilizer Control Unit <--> [Alarm Module, (Vehicle Antitheft)] > Component Information > Locations > Page 7

Alarm/Immobilizer Control Unit: Testing and Inspection
Control Unit Input Test

1. Before testing the keyless entry/security control functions, troubleshoot the multiplex control system with mode 1 and mode 2 tests.

Multiplex Control Unit, Driver's:

2. Remove the driver's multiplex control unit from the driver's under-dash fuse/relay box.

3. Inspect the connector and socket terminals to be sure they are all making good contact.

- If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.

- If the terminals look OK, go to step 4.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm/Immobilizer Control Unit <--> [Alarm Module, (Vehicle Antitheft)] >

Component Information > Locations > Page 8

Accord LX Coupe V6-3.0L (2001)

4. With the driver's multiplex control unit still disconnected, make these input tests at the connector and driver's under-dash fuse/relay box sockets.

- If any test indicates a problem, find and correct the cause, then recheck the system.

- If all the input tests prove OK go to step 5.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm/Immobilizer Control Unit <--> [Alarm Module, (Vehicle Antitheft)] >

Component Information > Locations > Page 9

Accord LX Coupe V6-3.0L (2001)

5. Reconnect the driver's multiplex control unit to the fuse/relay box, and perform the following input tests at the appropriate connectors on the back
of the fuse/relay box.-

If any test indicates a problem, find and correct the cause, then recheck the system.

- If all the input tests prove OK, go to step 6.

Multiplex Control Unit, Passenger's:

6. Remove the passenger's multiplex control unit from the passenger's under-dash fuse/relay box, and disconnect its connector.

7. Inspect the connector and socket terminals to be sure they are all making good contact.

- If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.

- If the terminals look OK, go to step 8.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm/Immobilizer Control Unit <--> [Alarm Module, (Vehicle Antitheft)] >

Component Information > Locations > Page 10

Accord LX Coupe V6-3.0L (2001)

8. With the passenger's multiplex control unit still disconnected, make these input tests at the connectors and the passenger's under-dash fuse/relay
box sockets.-

If any test indicates a problem, find and correct the cause, then recheck the system.

- If all the input tests prove OK, go to step 9.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm/Immobilizer Control Unit <--> [Alarm Module, (Vehicle Antitheft)] >

Component Information > Locations > Page 11

Accord LX Coupe V6-3.0L (2001)

9. Reconnect the passenger's multiplex control unit to the passenger S under-dash fuse/relay box, and perform the following input tests at the
appropriate connectors on the passenger's under-dash fuse/relay box (see connector views page 22-218). For passenger's under-dash fuse/relay boxconnector socket location.

All passenger lock knobs must be in the locked position, then unlocked and locked one at a time, or the test results will not be correct.NOTE:

- If any test indicates a problem, find and correct the cause, then recheck the system.

- If all the input tests prove OK, go to step 10.

Multiplex Control Unit, Door:

10. Remove the driver's multiplex control door unit, and disconnect its connector.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm/Immobilizer Control Unit <--> [Alarm Module, (Vehicle Antitheft)] >

Component Information > Locations > Page 12

Accord LX Coupe V6-3.0L (2001)

11. Inspect all the connector and socket terminals to be sure they are making good contact.

- If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.

- If the terminals look OK, go to step 12.

12. With the door unit still disconnected, make these input tests at the connector.

- If any test indicates a problem, find and correct the cause, then recheck the system.

- If all the input tests prove OK, go to step 13.

13. Reconnect the connectors to the door multiplex control unit, make these input tests at the connector.

- If any test indicates a problem, find and correct the cause, then recheck the system.

- If all the input tests prove OK, goto step 14.

14. If all the input tests prove OK, one of the control units must be faulty. Substitute a known-good control unit for the one that is most likely at fault,
then recheck the system. If the system works properly, the original control unit is faulty; replace it. If there is still a malfunction, substitute aknown-good control unit for the next most likely unit to be at fault, and recheck. If the system works properly, the original unit is faulty; replace it.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Alarm/Immobilizer Control Unit <--> [Alarm Module, (Vehicle Antitheft)] > Component Information > Locations > Page 13

Alarm/Immobilizer Control Unit: Service and Repair
Immobilizer Receiver Unit Replacement

1. Remove the driver's dashboard lower cover and steering column covers.

2. Disconnect the 5P and 7P connectors (A) from the immobilizer receiver unit (B).3. Remove the 2 screws (C) and the immobilizer receiver unit from the ignition key cylinder (D).4. Install in the reverse order of removal.5. After replacement, check the immobilizer system.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Keyless Entry Module > Component Information > Locations

97. Back Of Driver's Dashboard Lower Cover

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Keyless Entry Module > Component Information > Locations > Page 17

55 Keyless Or Keyless/Security Control Unit

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Keyless Entry Module > Component Information > Locations > Page 18

Keyless Entry Module: Testing and Inspection
Control Unit Input Test

1. Before testing the keyless entry/security control functions, troubleshoot the multiplex control system with mode 1 and mode 2 tests.

Multiplex Control Unit, Driver's:

2. Remove the driver's multiplex control unit from the driver's under-dash fuse/relay box.

3. Inspect the connector and socket terminals to be sure they are all making good contact.

- If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.

- If the terminals look OK, go to step 4.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Keyless Entry Module > Component Information > Locations > Page 19

Accord LX Coupe V6-3.0L (2001)

4. With the driver's multiplex control unit still disconnected, make these input tests at the connector and driver's under-dash fuse/relay box sockets.

- If any test indicates a problem, find and correct the cause, then recheck the system.

- If all the input tests prove OK go to step 5.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Keyless Entry Module > Component Information > Locations > Page 20

Accord LX Coupe V6-3.0L (2001)

5. Reconnect the driver's multiplex control unit to the fuse/relay box, and perform the following input tests at the appropriate connectors on the back
of the fuse/relay box.-

If any test indicates a problem, find and correct the cause, then recheck the system.

- If all the input tests prove OK, go to step 6.

Multiplex Control Unit, Passenger's:

6. Remove the passenger's multiplex control unit from the passenger's under-dash fuse/relay box, and disconnect its connector.

7. Inspect the connector and socket terminals to be sure they are all making good contact.

- If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.

- If the terminals look OK, go to step 8.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Keyless Entry Module > Component Information > Locations > Page 21

Accord LX Coupe V6-3.0L (2001)

8. With the passenger's multiplex control unit still disconnected, make these input tests at the connectors and the passenger's under-dash fuse/relay
box sockets.-

If any test indicates a problem, find and correct the cause, then recheck the system.

- If all the input tests prove OK, go to step 9.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Keyless Entry Module > Component Information > Locations > Page 22

Accord LX Coupe V6-3.0L (2001)

9. Reconnect the passenger's multiplex control unit to the passenger S under-dash fuse/relay box, and perform the following input tests at the
appropriate connectors on the passenger's under-dash fuse/relay box (see connector views page 22-218). For passenger's under-dash fuse/relay boxconnector socket location.

All passenger lock knobs must be in the locked position, then unlocked and locked one at a time, or the test results will not be correct.NOTE:

- If any test indicates a problem, find and correct the cause, then recheck the system.

- If all the input tests prove OK, go to step 10.

Multiplex Control Unit, Door:

10. Remove the driver's multiplex control door unit, and disconnect its connector.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Keyless Entry Module > Component Information > Locations > Page 23

Accord LX Coupe V6-3.0L (2001)

11. Inspect all the connector and socket terminals to be sure they are making good contact.

- If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.

- If the terminals look OK, go to step 12.

12. With the door unit still disconnected, make these input tests at the connector.

- If any test indicates a problem, find and correct the cause, then recheck the system.

- If all the input tests prove OK, go to step 13.

13. Reconnect the connectors to the door multiplex control unit, make these input tests at the connector.

- If any test indicates a problem, find and correct the cause, then recheck the system.

- If all the input tests prove OK, go to step 14.

14. If all the input tests prove OK, one of the control units must be faulty. Substitute a known-good control unit for the one that is most likely at fault,
then recheck the system. If the system works properly, the original control unit is faulty; replace it. If there is still a malfunction, substitute aknown-good control unit for the next most likely unit to be at fault, and recheck. If the system works properly, the original unit is faulty; replace it.

> Relays and Modules > Relays and Modules - Body and Frame > Keyless Entry Module > Component Information > Locations

97. Back Of Driver's Dashboard Lower Cover

> Relays and Modules > Relays and Modules - Body and Frame > Keyless Entry Module > Component Information > Locations > Page 28

55 Keyless Or Keyless/Security Control Unit

> Relays and Modules > Relays and Modules - Body and Frame > Keyless Entry Module > Component Information > Locations > Page 29

Keyless Entry Module: Testing and Inspection
Control Unit Input Test

1. Before testing the keyless entry/security control functions, troubleshoot the multiplex control system with mode 1 and mode 2 tests.

Multiplex Control Unit, Driver's:

2. Remove the driver's multiplex control unit from the driver's under-dash fuse/relay box.

3. Inspect the connector and socket terminals to be sure they are all making good contact.

- If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.

- If the terminals look OK, go to step 4.

> Relays and Modules > Relays and Modules - Body and Frame > Keyless Entry Module > Component Information > Locations > Page 30

Accord LX Coupe V6-3.0L (2001)

4. With the driver's multiplex control unit still disconnected, make these input tests at the connector and driver's under-dash fuse/relay box sockets.

- If any test indicates a problem, find and correct the cause, then recheck the system.

- If all the input tests prove OK go to step 5.

> Relays and Modules > Relays and Modules - Body and Frame > Keyless Entry Module > Component Information > Locations > Page 31

Accord LX Coupe V6-3.0L (2001)

5. Reconnect the driver's multiplex control unit to the fuse/relay box, and perform the following input tests at the appropriate connectors on the back
of the fuse/relay box.-

If any test indicates a problem, find and correct the cause, then recheck the system.

- If all the input tests prove OK, go to step 6.

Multiplex Control Unit, Passenger's:

6. Remove the passenger's multiplex control unit from the passenger's under-dash fuse/relay box, and disconnect its connector.

7. Inspect the connector and socket terminals to be sure they are all making good contact.

- If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.

- If the terminals look OK, go to step 8.

> Relays and Modules > Relays and Modules - Body and Frame > Keyless Entry Module > Component Information > Locations > Page 32

Accord LX Coupe V6-3.0L (2001)

8. With the passenger's multiplex control unit still disconnected, make these input tests at the connectors and the passenger's under-dash fuse/relay
box sockets.-

If any test indicates a problem, find and correct the cause, then recheck the system.

- If all the input tests prove OK, go to step 9.

> Relays and Modules > Relays and Modules - Body and Frame > Keyless Entry Module > Component Information > Locations > Page 33

Accord LX Coupe V6-3.0L (2001)

9. Reconnect the passenger's multiplex control unit to the passenger S under-dash fuse/relay box, and perform the following input tests at the
appropriate connectors on the passenger's under-dash fuse/relay box (see connector views page 22-218). For passenger's under-dash fuse/relay boxconnector socket location.

All passenger lock knobs must be in the locked position, then unlocked and locked one at a time, or the test results will not be correct.NOTE:

- If any test indicates a problem, find and correct the cause, then recheck the system.

- If all the input tests prove OK, go to step 10.

Multiplex Control Unit, Door:

10. Remove the driver's multiplex control door unit, and disconnect its connector.

> Relays and Modules > Relays and Modules - Body and Frame > Keyless Entry Module > Component Information > Locations > Page 34

Accord LX Coupe V6-3.0L (2001)

11. Inspect all the connector and socket terminals to be sure they are making good contact.

- If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.

- If the terminals look OK, go to step 12.

12. With the door unit still disconnected, make these input tests at the connector.

- If any test indicates a problem, find and correct the cause, then recheck the system.

- If all the input tests prove OK, go to step 13.

13. Reconnect the connectors to the door multiplex control unit, make these input tests at the connector.

- If any test indicates a problem, find and correct the cause, then recheck the system.

- If all the input tests prove OK, go to step 14.

14. If all the input tests prove OK, one of the control units must be faulty. Substitute a known-good control unit for the one that is most likely at fault,
then recheck the system. If the system works properly, the original control unit is faulty; replace it. If there is still a malfunction, substitute aknown-good control unit for the next most likely unit to be at fault, and recheck. If the system works properly, the original unit is faulty; replace it.

> Relays and Modules > Relays and Modules - Body and Frame > Power Door Lock Control Module > Component Information > Testing and Inspection

Power Door Lock Control Module: Testing and Inspection
Control Unit Input Test

1. Before testing the keyless entry/security control functions, troubleshoot the multiplex control system with mode 1 and mode 2 tests.

Multiplex Control Unit, Driver's:

2. Remove the driver's multiplex control unit from the driver's under-dash fuse/relay box.

3. Inspect the connector and socket terminals to be sure they are all making good contact.

- If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.

- If the terminals look OK, go to step 4.

> Relays and Modules > Relays and Modules - Body and Frame > Power Door Lock Control Module > Component Information > Testing and Inspection > Page 38

Accord LX Coupe V6-3.0L (2001)

4. With the driver's multiplex control unit still disconnected, make these input tests at the connector and driver's under-dash fuse/relay box sockets.

- If any test indicates a problem, find and correct the cause, then recheck the system.

- If all the input tests prove OK go to step 5.

> Relays and Modules > Relays and Modules - Body and Frame > Power Door Lock Control Module > Component Information > Testing and Inspection > Page 39

Accord LX Coupe V6-3.0L (2001)

5. Reconnect the driver's multiplex control unit to the fuse/relay box, and perform the following input tests at the appropriate connectors on the back
of the fuse/relay box.-

If any test indicates a problem, find and correct the cause, then recheck the system.

- If all the input tests prove OK, go to step 6.

Multiplex Control Unit, Passenger's:

6. Remove the passenger's multiplex control unit from the passenger's under-dash fuse/relay box, and disconnect its connector.

7. Inspect the connector and socket terminals to be sure they are all making good contact.

- If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.

- If the terminals look OK, go to step 8.

> Relays and Modules > Relays and Modules - Body and Frame > Power Door Lock Control Module > Component Information > Testing and Inspection > Page 40

Accord LX Coupe V6-3.0L (2001)

8. With the passenger's multiplex control unit still disconnected, make these input tests at the connectors and the passenger's under-dash fuse/relay
box sockets.-

If any test indicates a problem, find and correct the cause, then recheck the system.

- If all the input tests prove OK, go to step 9.

> Relays and Modules > Relays and Modules - Body and Frame > Power Door Lock Control Module > Component Information > Testing and Inspection > Page 41

Accord LX Coupe V6-3.0L (2001)

9. Reconnect the passenger's multiplex control unit to the passenger S under-dash fuse/relay box, and perform the following input tests at the
appropriate connectors on the passenger's under-dash fuse/relay box (see connector views page 22-218). For passenger's under-dash fuse/relay boxconnector socket location.

All passenger lock knobs must be in the locked position, then unlocked and locked one at a time, or the test results will not be correct.NOTE:

- If any test indicates a problem, find and correct the cause, then recheck the system.

- If all the input tests prove OK, go to step 10.

Multiplex Control Unit, Door:

10. Remove the driver's multiplex control door unit, and disconnect its connector.

> Relays and Modules > Relays and Modules - Body and Frame > Power Door Lock Control Module > Component Information > Testing and Inspection > Page 42

Accord LX Coupe V6-3.0L (2001)

11. Inspect all the connector and socket terminals to be sure they are making good contact.

- If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.

- If the terminals look OK, go to step 12.

12. With the door unit still disconnected, make these input tests at the connector.

- If any test indicates a problem, find and correct the cause, then recheck the system.

- If all the input tests prove OK, go to step 13.

13. Reconnect the connectors to the door multiplex control unit, make these input tests at the connector.

- If any test indicates a problem, find and correct the cause, then recheck the system.

- If all the input tests prove OK, goto step 14.

14. If all the input tests prove OK, one of the control units must be faulty. Substitute a known-good control unit for the one that is most likely at fault,
then recheck the system. If the system works properly, the original control unit is faulty; replace it. If there is still a malfunction, substitute aknown-good control unit for the next most likely unit to be at fault, and recheck. If the system works properly, the original unit is faulty; replace it.

> Relays and Modules > Relays and Modules - Body and Frame > Power Door Lock Relay > Component Information > Locations

101. Behind Driver's Dashboard Lower Cover (LX)

> Relays and Modules > Relays and Modules - Body and Frame > Power Door Lock Relay > Component Information > Locations > Page 46

15. Unlock Relay

> Relays and Modules > Relays and Modules - Body and Frame > Seat Heater Relay > Component Information > Locations

Relay And Control Unit Locations - Dashboard

> Relays and Modules > Relays and Modules - Body and Frame > Seat Heater Relay > Component Information > Locations > Page 50

Seat Heater Relay: Testing and Inspection

Check for continuity between the terminals.

- There should be continuity between the No.1 and No.2 terminals when power and ground are connected to the No.3 and No.4 terminals.

- There should be no continuity between the No.1 and No.2 terminals when power is disconnected.

Type 1

Type 2

Seat heater relay

> Relays and Modules > Relays and Modules - Body and Frame > Sunroof/Moonroof Relay <--> [Sunroof / Moonroof Relay] > Component Information > Locations

105. Above Left Kick Panel

> Relays and Modules > Relays and Modules - Body and Frame > Sunroof/Moonroof Relay <--> [Sunroof / Moonroof Relay] > Component Information > Locations > Page 54

Sunroof/Moonroof Relay: Testing and Inspection

Check for continuity between the terminals.

- There should be continuity between the No.1 and No.2 terminals when power and ground are connected t9 the No.3 and No.5 terminals.

- There should be continuity between the No.1 and No.4 terminals when power is disconnected.

Moonroof Open And Close Relays

Moonroof open and close relays

> Relays and Modules > Relays and Modules - Body and Frame > Trunk / Liftgate Relay > Component Information > Locations

97. Back Of Driver's Dashboard Lower Cover

> Relays and Modules > Relays and Modules - Brakes and Traction Control > ABS Main Relay > Component Information > Locations

> Relays and Modules > Relays and Modules - Brakes and Traction Control > ABS Main Relay > Component Information > Locations > Page 62

ABS Main Relay: Testing and Inspection

Use this chart to identify the type of relay, then do the test listed for it.

See Turn Signal/Hazard Relay input test.NOTE:

> Relays and Modules > Relays and Modules - Brakes and Traction Control > ABS Main Relay > Component Information > Locations > Page 63

Accord LX Coupe V6-3.0L (2001)

Type 1

Type 2

Normally-open type A:

Check for continuity between the terminals.

- There should be continuity between the No.1 and No.2 terminals when power and ground are connected to the No.3 and No.4 terminals.

- There should be no continuity between the No.1 and No.2 terminals when power is disconnected.

Rear Window Defogger Relay

> Relays and Modules > Relays and Modules - Brakes and Traction Control > ABS Main Relay > Component Information > Locations > Page 64

Accord LX Coupe V6-3.0L (2001)

ABS Pump Motor Relay

Blower Motor Relay, Type 1

Blower Motor Relay, Type 2

> Relays and Modules > Relays and Modules - Brakes and Traction Control > ABS Main Relay > Component Information > Locations > Page 65

Accord LX Coupe V6-3.0L (2001)

Normally-open type B:

Check for continuity between the terminals.

- There should be continuity between the No.1 and No.3 terminals when power and ground are connected to the No.2 and No.4 terminals.

- There should be no continuity between the No.1 and No.3 terminals when power is disconnected.

Windshield Wiper Intermittent Relay

Five-terminal type A:

Check for continuity between the terminals.

- There should be continuity between the No.1 and No.2 terminals when power and ground are connected to the No.3 and No.5 terminals.

- There should be continuity between the No.2 and No.4 terminals when power is disconnected.

Moonroof Open And Close Relays

Five-terminal type B:

Check for continuity between the terminals.

- There should be continuity between the No.1 and No.2 terminals when power and ground are connected t9 the No.3 and No.5 terminals.

- There should be continuity between the No.1 and No.4 terminals when power is disconnected.

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Brake Fluid Pump Relay > Component Information > Locations

Brake Fluid Pump Relay: Locations

9. Right Rear Of Engine Compartment

Relay And Control Unit Locations - Engine Compartment

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Brake Fluid Pump Relay > Component Information > Locations > Page 69

Brake Fluid Pump Relay: Testing and Inspection

Check for continuity between the terminals.

- There should be continuity between the No.1 and No.3 terminals when power and ground are connected to the No.2 and No.4 terminals.

- There should be no continuity between the No.1 and No.3 terminals when power is disconnected.

ABS Pump Motor Relay

ABS pump motor relay

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Locations > Component Locations

Electronic Brake Control Module: Component Locations

67. Right Front Of V6 Engine Compartment

195. Behind Right Kick Panel (V6) ('01 -'02 Models)

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Locations > Component Locations > Page 74

195. Behind Right Kick Panel (V6) ('01 -'02 Models)

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Diagrams > Exploded Views

Electronic Brake Control Module: Exploded Views

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Diagrams > Exploded Views > Page 77

Electronic Brake Control Module: Connector Views

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Diagrams > Exploded Views >

Page 78

Accord LX Coupe V6-3.0L (2001)

76. ABS-TCS Control Unit Connectors A - C

77. ABS-TCS Modulator Unit

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Diagrams > Page 79

Electronic Brake Control Module: Description and Operation

ABS Control Unit

Main Control

The ABS control unit detects the wheel speed based on the wheel sensor signal it received, then it calculates the vehicle speed based on the detectedwheel speed. The control unit detects the vehicle speed during deceleration based on the rate of deceleration.The ABS control unit calculates the slip rate of each wheel, and it transmits the control signal to the modulator unit solenoid valve when the slip rate ishigh.

The pressure reduction control has 3-modes: pressure reducing, pressure retaining, and pressure intensifying.

Self-diagnosis

1. The ABS control unit is equipped with a main CPU and a sub CPU, that check each other for problems.2. The CPUs check the circuit of the system.3. Self-diagnosis can be classified into 2 categories:

- Initial diagnosis: Done right after the engine starts and until the ABS indicator goes off.

- Regular diagnosis: Done right after the initial diagnosis until the ignition switch is turned OFF.

4. When a problem is detected by self-diagnosis, the system:

- Turns the fail-safe relay OFF

- Turns the solenoid valve OFF

- Turn the pump motor OFF

- Turns the ABS indicator ON