Chrysler Voyager 2000 GS Instruction
NS EMISSION CONTROL SYSTEMS 25 - 1
EMISSION CONTROL SYSTEMS
TABLE OF CONTENTS
page page
ON-BOARD DIAGNOSTICS ................... 1
EVAPORATIVE EMISSION CONTROLS ......... 22
ON-BOARD DIAGNOSTICS
TABLE OF CONTENTS
page page
DESCRIPTION AND OPERATION
SYSTEM DESCRIPTION ....................1
MALFUNCTION INDICATOR LAMP (MIL)........2
DRB III STATE DISPLAY TEST MODE ..........2
DRB III CIRCUIT ACTUATION TEST MODE ......2
DIAGNOSTIC TROUBLE CODES ..............2
DIAGNOSTIC TROUBLE CODE
DESCRIPTIONS .........................3
DESCRIPTION AND OPERATION
SYSTEM DESCRIPTION
DESCRIPTION
OBD II requires that vehicles falling under OBD II
guidelines utilize the following system monitors:
• Comprehensive Component Monitor (inputs/outputs for powertrain management that affect emissions, but do not have a specific major monitor)
• Fuel Control Monitor (fuel compensation
required to maintain stoichiometric ratio rich/lean)
• Misfire Monitor (change in crankshaft speed)
• Oxygen Sensor Heater Monitor (response and
performance of oxygen sensors)
• Catalyst Monitor (Performance and efficiency of
catalyst)
• Evaporative Emissions Monitor (performance of
and leaks from EVAP system)
• Exhaust Gas Recirculation Monitor (flow performance of EGR system)
The software was rewritten to enable the PCM to
carry out the responsibilities to meet these required
guidelines. The PCM now contains a Task Manager.
EXHAUST GAS RECIRCULATION (EGR)
SYSTEM............................... 27
MONITORED SYSTEMS....................12
TRIP DEFINITION ........................16
MONITORED COMPONENT.................16
NON-MONITORED CIRCUITS ...............20
HIGH AND LOW LIMITS....................21
SPECIFICATIONS
LOAD VALUE............................21
OPERATION
The Powertrain Control Module (PCM) monitors
many different circuits in the fuel injection, ignition,
emission and engine systems. If the PCM senses a
problem with a monitored circuit often enough to
indicate an actual problem, it stores a Diagnostic
Trouble Code (DTC) in the PCM’s memory. If the
code applies to a non-emissions related component or
system, and the problem is repaired or ceases to
exist, the PCM cancels the code after 40 warmup
cycles. Diagnostic trouble codes that affect vehicle
emissions illuminate the Malfunction Indicator Lamp
(MIL). Refer to Malfunction Indicator Lamp in this
section.
Certain criteria must be met before the PCM
stores a DTC in memory. The criteria may be a specific range of engine RPM, engine temperature,
and/or input voltage to the PCM.
The PCM might not store a DTC for a monitored
circuit even though a malfunction has occurred. This
may happen because one of the DTC criteria for the
circuit has not been met. For example, assume the
diagnostic trouble code criteria requires the PCM to
monitor the circuit only when the engine operates
between 750 and 2000 RPM. Suppose the sensor’s
output circuit shorts to ground when engine operates
above 2400 RPM (resulting in 0 volt input to the
25 - 2 EMISSION CONTROL SYSTEMS NS
DESCRIPTION AND OPERATION (Continued)
PCM). Because the condition happens at an engine
speed above the maximum threshold (2000 rpm), the
PCM will not store a DTC.
There are several operating conditions for which
the PCM monitors and sets DTC’s. Refer to Monitored Systems, Components, and Non-Monitored Circuits in this section.
NOTE: Various diagnostic procedures may actually
cause a diagnostic monitor to set a DTC. For
instance, pulling a spark plug wire to perform a
spark test may set the misfire code. When a repair
is completed and verified, use the DRB III scan tool
to erase all DTC’s and extinguish the MIL.
Technicians can display stored DTC’s by using the
DRB III scan tool. Refer to Diagnostic Trouble Codes
in this section. For DTC information, refer to charts
in this section.
Limp-In mode or identified a failed emission component or system. The MIL remains on until the DTC
is erased. Refer to the Diagnostic Trouble Code
charts in this group for emission related codes.
Also, the MIL either flashes or illuminates continuously when the PCM detects active engine misfire.
Refer to Misfire Monitoring in this section.
Additionally, the PCM may reset (turn off) the MIL
when one of the following occur:
• PCM does not detect the malfunction for 3 consecutive trips (except misfire and fuel system monitors).
• PCM does not detect a malfunction while performing three successive engine misfire or fuel system tests. The PCM performs these tests while the
engine is operating within 6 375 RPM of and within
10 % of the load of the operating condition at which
the malfunction was first detected.
DRB III STATE DISPLAY TEST MODE
OPERATION
The switch inputs to the Powertrain Control Module (PCM) have two recognized states; HIGH and
LOW. For this reason, the PCM cannot recognize the
difference between a selected switch position versus
an open circuit, a short circuit, or a defective switch.
If the State Display screen shows the change from
HIGH to LOW or LOW to HIGH, assume the entire
switch circuit to the PCM functions properly. From
the state display screen, access either State Display
Inputs and Outputs or State Display Sensors.
Fig. 1 Data Link (Diagnostic) Connector
1 – DIAGNOSTIC CONNECTOR
MALFUNCTION INDICATOR LAMP (MIL)
DESCRIPTION
The data link connector is located at the lower
edge of the instrument panel near the steering column.
OPERATION
As a functional test, the Malfunction Indicator
Lamp (MIL) illuminates at key-on before engine
cranking. Whenever the Powertrain Control Module
(PCM) sets a Diagnostic Trouble Code (DTC) that
affects vehicle emissions, it illuminates the MIL. If a
problem is detected, the PCM sends a message over
the CCD Bus to the instrument cluster to illuminate
the lamp. The PCM illuminates the MIL only for
DTC’s that affect vehicle emissions. The MIL stays
on continuously when the PCM has entered a
DRB III CIRCUIT ACTUATION TEST MODE
OPERATION
The Circuit Actuation Test Mode checks for proper
operation of output circuits or devices the Powertrain
Control Module (PCM) may not internally recognize.
The PCM attempts to activate these outputs and
allow an observer to verify proper operation. Most of
the tests provide an audible or visual indication of
device operation (click of relay contacts, fuel spray,
etc.). Except for intermittent conditions, if a device
functions properly during testing, assume the device,
its associated wiring, and driver circuit work correctly.
DIAGNOSTIC TROUBLE CODES
DESCRIPTION
A Diagnostic Trouble Code (DTC) indicates the
PCM has recognized an abnormal condition in the
system.
NS EMISSION CONTROL SYSTEMS 25 - 3
DESCRIPTION AND OPERATION (Continued)
Remember that DTC’s are the results of a system or circuit failure, but do not directly identify the failed component or components.
NOTE: For a list of DTC’s, refer to the charts in this
section.
OPERATION
BULB CHECK
Each time the ignition key is turned to the ON
position, the malfunction indicator (check engine)
lamp on the instrument panel should illuminate for
approximately 2 seconds then go out. This is done for
a bulb check.
OBTAINING DTC’S USING DRB SCAN TOOL
(1) Connect the DRB scan tool to the data link
(diagnostic) connector. This connector is located in
the passenger compartment; at the lower edge of
instrument panel; near the steering column.
(2) Turn the ignition switch on and access the
“Read Fault” screen.
(3) Record all the DTC’s and “freeze frame” information shown on the DRB scan tool.
(4) To erase DTC’s, use the “Erase Trouble Code”
data screen on the DRB scan tool. Do not erase any
DTC’s until problems have been investigated
and repairs have been performed.
DIAGNOSTIC TROUBLE CODE DESCRIPTIONS
(M) Check Engine Lamp (MIL) will illuminate during engine operation if this Diagnostic Trouble Code was
recorded.
(G) Generator Lamp Illuminated
GENERIC
SCAN TOOL
CODE
P0106 (M) Barometric Pressure Out of Range MAP sensor input voltage out of an acceptable range
P0107 (M) Map Sensor Voltage Too Low MAP sensor input below minimum acceptable voltage.
P0108 (M) Map Sensor Voltage Too High MAP sensor input above maximum acceptable voltage.
P0112 (M) Intake Air Temp Sensor Voltage Low Intake air (charge) temperature sensor input below the
P0113 (M) Intake Air Temp Sensor Voltage High Intake air (charge) temperature sensor input above the
P0116 A rationatilty error has been detected in the coolant temp
P0117 (M) ECT Sensor Voltage Too Low Engine coolant temperature sensor input below the
P0118 (M) ECT Sensor Voltage Too High Engine coolant temperature sensor input above the
P0121 (M) TPS Voltage Does Not Agree With
P0122 (M) Throttle Position Sensor Voltage Low Throttle position sensor input below the acceptable
P0123 (M) Throttle Position Sensor Voltage
P0125 (M) Closed Loop Temp Not Reached Time to enter Closed Loop Operation (Fuel Control) is
P0130 1/1 O2 Sensor Heater Relay Circuit An open or shorted condition detected in the ASD or CNG
P0131 (M) 1/1 O2 Sensor Shorted To Ground Oxygen sensor input voltage maintained below normal
DRB SCAN TOOL DISPLAY DESCRIPTION OF DIAGNOSTIC TROUBLE CODE
detected during reading of barometric pressure at key-on.
minimum acceptable voltage.
maximum acceptable voltage.
sensor.
minimum acceptable voltage.
maximum acceptable voltage.
TPS signal does not correlate to MAP sensor signal.
MAP
voltage range.
Throttle position sensor input above the maximum
High
acceptable voltage.
excessive.
shutoff relay control ckt.
operating range.
25 - 4 EMISSION CONTROL SYSTEMS NS
DESCRIPTION AND OPERATION (Continued)
(M) Check Engine Lamp (MIL) will illuminate during engine operation if this Diagnostic Trouble Code was
recorded.
(G) Generator Lamp Illuminated
P0132 (M) 1/1 O2 Sensor Shorted To Voltage Oxygen sensor input voltage maintained above normal
operating range.
P0133 (M) 1/1 O2 Sensor Slow Response Oxygen sensor response slower than minimum required
switching frequency.
P0134 (M) 1/1 O2 Sensor Stays at Center Neither rich or lean condition is detected from the oxygen
sensor input.
P0135 (M) 1/1 O2 Sensor Heater Failure Oxygen sensor heater element malfunction.
P0136 1/2 O2 Sensor Heater Relay Circuit An open or shorted condition detected in the ASD or CNG
shutoff relay control ckt.
P0137 (M) 1/2 O2 Sensor Shorted To Ground Oxygen sensor input voltage maintained below normal
operating range.
P0138 (M) 1/2 O2 Sensor Shorted To Voltage Oxygen sensor input voltage maintained above normal
operating range.
P0139 (M) 1/2 O2 Sensor Slow Response Oxygen sensor response not as expected.
P0140 (M) 1/2 O2 Sensor Stays at Center Neither rich or lean condition is detected from the oxygen
sensor.
P0141 (M) 1/2 O2 Sensor Heater Failure Oxygen sensor heater element malfunction.
P0143 1/3 O2 Sensor Shorted To Ground Oxygen sensor input voltage maintained below normal
operating range.
P0144 1/3 O2 Sensor Shorted To Voltage Oxygen sensor input voltage maintained above normal
operating range.
P0145 1/3 O2 Sensor Slow Response Oxygen sensor response slower than minimum required
switching frequency.
P0146 1/3 O2 Sensor Stays at Center Neither rich or lean condition is detected from the oxygen
sensor.
P0147 1/3 O2 Sensor Heater Failure Oxygen sensor heater element malfunction.
P0151 (M) 2/1 O2 Sensor Shorted To Ground Oxygen sensor input voltage maintained below normal
operating range.
P0152 (M) 2/1 O2 Sensor Shorted To Voltage Oxygen sensor input voltage sustained above normal
operating range.
P0153 (M) 2/1 O2 Sensor Slow Response Oxygen sensor response slower than minimum required
switching frequency.
P0154 (M) 2/1 O2 Sensor Stays at Center Neither rich or lean condition is detected from the oxygen
sensor.
P0155 (M) 2/1 O2 Sensor Heater Failure Oxygen sensor heater element malfunction.
P0157 (M) 2/2 O2 Sensor Shorted To Ground Oxygen sensor input voltage maintained below normal
operating range.
P0158 (M) 2/2 O2 Sensor Shorted To Voltage Oxygen sensor input voltage maintained above normal
operating range.
P0159 2/2 O2 Sensor Slow Response Oxygen sensor response slower than minimum required
switching frequency.
P0160 (M) 2/2 O2 Sensor Stays at Center Neither rich or lean condition is detected from the oxygen
sensor.
P0161 (M) 2/2 O2 Sensor Heater Failure Oxygen sensor heater element malfunction.
NS EMISSION CONTROL SYSTEMS 25 - 5
DESCRIPTION AND OPERATION (Continued)
(M) Check Engine Lamp (MIL) will illuminate during engine operation if this Diagnostic Trouble Code was
recorded.
(G) Generator Lamp Illuminated
P0165 Starter Relay Control Circuit An open or shorted condition detected in the starter relay
control circuit.
P0171 (M) 1/1 Fuel System Lean A lean air/fuel mixture has been indicated by an
abnormally rich correction factor.
P0172 (M) 1/1 Fuel System Rich A rich air/fuel mixture has been indicated by an
abnormally lean correction factor.
P0174 (M) 2/1 Fuel System Lean A lean air/fuel mixture has been indicated by an
abnormally rich correction factor.
P0175 (M) 2/1 Fuel System Rich A rich air/fuel mixture has been indicated by an
abnormally lean correction factor.
P0178 Water in Fuel Sensor Voltage Too
Low
P0179 Flex Fuel Sensor Volts Too High Flex fuel sensor input above maximum acceptable
P0182 CNG Temp Sensor Voltage Too Low Compressed natural gas temperature sensor voltage
P0183 CNG Temp Sensor Voltage Too High Compressed natural gas temperature sensor voltage
P0201 (M) Injector #1 Control Circuit An open or shorted condition detected in control circuit for
P0202 (M) Injector #2 Control Circuit An open or shorted condition detected in control circuit for
P0203 (M) Injector #3 Control Circuit An open or shorted condition detected in control circuit for
P0204 (M) Injector #4 Control Circuit Injector #4 or INJ 4 injector bank output driver stage does
P0205 (M) Injector #5 Control Circuit Injector #5 output driver stage does not respond properly
P0206 (M) Injector #6 Control Circuit Injector #6 output driver stage does not respond properly
P0207 Injector #7 Control Circuit Injector #7 output driver stage does not respond properly
P0208 Injector #8 Control Circuit Injector #8 output driver stage does not respond properly
P0209 Injector #9 Control Circuit Injector #9 output driver stage does not respond properly
P0210 Injector #10 Control Circuit Injector #10 output driver stage does not respond properly
P0300 (M) Multiple Cylinder Mis-fire Misfire detected in multiple cylinders.
P0301 (M) CYLINDER #1 MISFIRE Misfire detected in cylinder #1.
P0302 (M) CYLINDER #2 MISFIRE Misfire detected in cylinder #2.
P0303 (M) CYLINDER #3 MISFIRE Misfire detected in cylinder #3.
P0304 (M) CYLINDER #4 MISFIRE Misfire detected in cylinder #4.
P0305 (M) CYLINDER #5 MISFIRE Misfire detected in cylinder #5.
P0306 (M) CYLINDER #6 MISFIRE Misfire detected in cylinder #6.
Flex fuel sensor input below minimum acceptable voltage.
voltage.
below acceptable voltage.
above acceptable voltage.
injector #1 or the INJ 1 injector bank.
injector #2 or the INJ 2 injector bank.
injector #3 or the INJ 3 injector bank.
not respond properly to the control signal.
to the control signal.
to the control signal.
to the control signal.
to the control signal.
to the control signal.
to the control signal.
25 - 6 EMISSION CONTROL SYSTEMS NS
DESCRIPTION AND OPERATION (Continued)
(M) Check Engine Lamp (MIL) will illuminate during engine operation if this Diagnostic Trouble Code was
recorded.
(G) Generator Lamp Illuminated
P0307 (M) CYLINDER #7 MISFIRE Misfire detected in cylinder #7
P0308 (M) CYLINDER #8 MISFIRE Misfire detected in cylinder #8.
P0309 (M) CYLINDER #9 MISFIRE Misfire detected in cylinder #9.
P0310 (M) CYLINDER #10 MISFIRE Misfire detected in cylinder #10.
P0320 No Crank Referance Signal at PCM No reference signal (crankshaft position sensor) detected
during engine cranking.
P0325 Knock Sensor #1 Circuit Knock sensor (#1) signal above or below minimum
acceptable threshold voltage at particular engine speeds.
P0330 Knock Sensor #2 Circuit Knock sensor (#2) signal above or below minimum
acceptable threshold voltage at particular engine speeds.
P0340 (M) No Cam Signal At PCM No fuel sync
P0350 Ignition Coil Draws Too Much
Current
P0351 (M) Ignition Coil # 1 Primary Circuit Peak primary circuit current not achieved with maximum
P0352 (M) Ignition Coil # 2 Primary Circuit Peak primary circuit current not achieved with maximum
P0353 (M) Ignition Coil # 3 Primary Circuit Peak primary circuit current not achieved with maximum
P0354 (M) Ignition Coil # 4 Primary Circuit Peak primary circuit current not achieved with maximum
P0355 (M) Ignition Coil # 5 Primary Circuit Peak primary circuit current not achieved with maximum
P0356 (M) Ignition Coil # 6 Primary Circuit Peak primary circuit current not achieved with maximum
P0357 Ignition Coil # 7 Primary Circuit Peak primary circuit current not achieved with maximum
P0358 Ignition Coil # 8 Primary Circuit Peak primary circuit current not achieved with maximum
P0401 (M) EGR System Failure Required change in air/fuel ration not detected during
P0403 (M) EGR Solenoid Circuit An open or shorted condition detected in the EGR
P0404 (M) EGR Position Sensor Rationality EGR position sensor signal does not correlate to EGR
P0405 (M) EGR Position Sensor Volts Too Low EGR position sensor input below the acceptable voltage
P0406 (M) EGR Position Sensor Volts Too High EGR position sensor input above the acceptable voltage
P0412 Secondary Air Solenoid Circuit An open or shorted condition detected in the secondary
P0420 (M) 1/1 Catalytic Converter Efficiency Catalyst 1/1 efficiency below required level.
P0432 (M) 1/2 Catalytic Converter Efficiency Catalyst 2/1 efficiency below required level.
P0441 (M) Evap Purge Flow Monitor Insufficient or excessive vapor flow detected during
A coil (1-5) is drawing too much current.
dwell time.
dwell time.
dwell time.
dwell time (High Impedance).
dwell time (High Impedance).
dwell time (high impedance).
dwell time (high impedance).
dwell time (high impedance).
diagnostic test.
solenoid control circuit.
duty cycle.
range.
range.
air (air switching/aspirator) solenoid control circuit.
evaporative emission system operation.
NS EMISSION CONTROL SYSTEMS 25 - 7
DESCRIPTION AND OPERATION (Continued)
(M) Check Engine Lamp (MIL) will illuminate during engine operation if this Diagnostic Trouble Code was
recorded.
(G) Generator Lamp Illuminated
P0442 (M) Evap Leak Monitor Medium Leak
Detected
P0443 (M) Evap Purge Solenoid Circuit An open or shorted condition detected in the EVAP purge
P0455 (M) Evap Leak Monitor Large Leak
Detected
P0456 Evap Leak Monitor Small Leak
Detected
P0460 Fuel Level Unit No Change Over
Miles
P0461 Fuel Level Unit No Changeover Time No level of fuel level sender detected.
P0462 Fuel Level Sending Unit Volts Too
Low
P0463 Fuel Level Sending Unit Volts Too
High
P0500 (M) No Vehicle Speed Sensor Signal No vehicle speed sensor signal detected during road load
P0505 (M) Idle Air Control Motor Circuits Replace
P0522 Oil Pressure Sens Low Oil pressure sensor input below acceptable voltage.
P0523 Oil Pressure Sens High Oil pressure sensor input above acceptable voltage.
P0551 (M) Power Steering Switch Failure Incorrect input state detected for the power steering
P0600 (M) PCM Failure SPI Communications No communication detected between co-processors in the
P0601 (M) Internal Controller Failure Internal control module fault condition (check sum)
P0604 Internal Trans Controller Transmission control module RAM self test fault detected.
P0605 Internal Trans Controller Transmission control module ROM self test fault detected
P0622 (G) Generator Field Not Switching
Properly
P0645 A/C Clutch Relay Circuit An open or shorted condition detected in the A/C clutch
P0700 (M) EATX Controller DTC Present This SBEC III or JTEC DTC indicates that the EATX or
P0703 (M) Brake Switch Stuck Pressed or
Released
P0711 Trans Temp Sensor, No Temp Rise
After Start
A small leak has been detected in the evaporative
system.
solenoid control circuit.
A large leak has been detected in the evaporative system.
A small leak has been detected in the evaporative
system.
No movement of fuel level sender detected.
Fuel level sensor input below acceptable voltage.
Fuel level sensor input above acceptable voltage.
conditions.
switch circuit. PL: High pressure seen at high speed.
control module.
detected.
-Aisin transmission.
-Aisin transmission.
An open or shorted condition detected in the generator
field control circuit.
relay control circuit.
Aisin controller has an active fault and has illuminated the
MIL via a CCD (EATX) or SCI (Aisin) message. The
specific fault must be acquired from the EATX via CCD or
from the Aisin via ISO-9141.
Incorrect input state detected in the brake switch circuit.
(Changed from P1595).
Relationship between the transmission temperature and
overdrive operation and/or TCC operation indicates a
failure of the Transmission Temperature Sensor. OBD II
Rationality.
25 - 8 EMISSION CONTROL SYSTEMS NS
DESCRIPTION AND OPERATION (Continued)
(M) Check Engine Lamp (MIL) will illuminate during engine operation if this Diagnostic Trouble Code was
recorded.
(G) Generator Lamp Illuminated
P0712 Trans Temp Sensor Voltage Too Low Transmission fluid temperature sensor input below
acceptable voltage.
P0713 Trans Temp Sensor Voltage Too
High
P0720 Low Output SPD Sensor RPM,
Above 15 MPH
P0740 (M) Torq Con Clu, No RPM Drop at
Lockup
P0743 Torque Converter Clutch Solenoid/
Trans Relay Circuits
P0748 Governor Pressur Sol Control/Trans
Relay Circuits
P0751 O/D Switch Pressed (Lo) More Than
5 Minutes
P0753 Trans 3-4 Shift Sol/Trans Relay
Circuits
P0756 AW4 Shift Sol B (2-3) Functional
Failure
P0783 3-4 Shift Sol, No RPM Drop at
Lockup
P0801 Reverse Gear Lockout Circuit Open
or Short
P01192 Inlet Air Temp. Circuit Low Inlet Air Temp. sensor input below acceptable voltage
P01193 Inlet Air Temp. Circuit High Inlet Air Temp. sensor input above acceptable voltage.
P1195 (M) 1/1 O2 Sensor Slow During Catalyst
Monitor
P1196 (M) 2/1 O2 Sensor Slow During Catalyst
Monitor
P1197 1/2 O2 Sensor Slow During Catalyst
Monitor
P1198 Radiator Temperature Sensor Volts
Too High
P1199 Radiator Temperature Sensor Volts
Too Low
P1281 Engine is Cold Too Long Engine coolant temperature remains below normal
P1282 Fuel Pump Relay Control Circuit An open or shorted condition detected in the fuel pump
P1288 Intake Manifold Short Runner
Solenoid Circuit
P1289 Manifold Tune Valve Solenoid Circuit An open or shorted condition detected in the manifold
Transmission fluid temperature sensor input above
acceptable voltage.
The relationship between the Output Shaft Speed Sensor
and vehicle speed is not within acceptable limits.
Relationship between engine and vehicle speeds
indicated failure of torque convertor clutch lock-up system
(TCC/PTU sol).
An open or shorted condition detected in the torque
converter clutch (part throttle unlock) solenoid control
circuit. Shift solenoid C electrical fault - Aisin transmission
An open or shorted condition detected in the Governor
Pressure Solenoid circuit or Trans Relay Circuit in JTEC
RE transmissions.
Overdrive override switch input is in a prolonged
depressed state.
An open or shorted condition detected in the overdrive
solenoid control circuit or Trans Relay Circuit in JTEC RE
transmissions.
Shift solenoid B (2-3) functional fault - Aisin transmission
The overdrive solenoid is unable to engage the gear
change from 3rd gear to the overdrive gear.
An open or shorted condition detected in the transmission
reverse gear lock-out solenoid control circuit.
A slow switching oxygen sensor has been detected in
bank 1/1 during catalyst monitor test. (was P0133)
A slow switching oxygen sensor has been detected in
bank 2/1 during catalyst monitor test. (was P0153)
A slow switching oxygen sensor has been detected in
bank 1/2 during catalyst monitor test. (was P0139)
Radiator coolant temperature sensor input above the
maximum acceptable voltage.
Radiator coolant temperature sensor input below the
minimum acceptable voltage.
operating temperatures during vehicle travel (Thermostat).
relay control circuit.
An open or shorted condition detected in the short runner
tuning valve circuit.
tuning valve solenoid control circuit.
NS EMISSION CONTROL SYSTEMS 25 - 9
DESCRIPTION AND OPERATION (Continued)
(M) Check Engine Lamp (MIL) will illuminate during engine operation if this Diagnostic Trouble Code was
recorded.
(G) Generator Lamp Illuminated
P1290 CNG Fuel System Pressure Too
High
P1291 No Temp Rise Seen From Intake
Heaters
P1292 CNG Pressure Sensor Voltage Too
High
P1293 CNG Pressure Sensor Voltage Too
Low
P1294 (M) Target Idle Not Reached Target RPM not achieved during drive idle condition.
P1295 No 5 Volts to TP Sensor Loss of a 5 volt feed to the Throttle Position Sensor has
P1296 No 5 Volts to MAP Sensor Loss of a 5 volt feed to the MAP Sensor has been
P1297 (M) No Change in MAP From Start To
Run
P1298 Lean Operation at Wide Open
Throttle
P1299 (M) Vacuum Leak Found (IAC Fully
Seated)
P1388 Auto Shutdown Relay Control Circuit An open or shorted condition detected in the ASD or CNG
P1389 No ASD Relay Output Voltage At
PCM
P1390 (M) Timing Belt Skipped 1 Tooth or More Relationship between Cam and Crank signals not correct.
P1391 (M) Intermittent Loss of CMP or CKP Loss of the Cam Position Sensor or Crank Position
P1398 (M) Mis-Fire Adaptive Numerator at Limit PCM is unable to learn the Crank Sensor’s signal in
P1399 Wait To Start Lamp Cicuit An open or shorted condition detected in the Wait to Start
P1403 No 5 Volts to EGR Sensor Loss of 5v feed to the EGR position sensor.
P1476 Too Little Secondary Air Insufficient flow of secondary air injection detected during
P1477 Too Much Secondary Air Excessive flow of secondary air injection detected during
P1478 (M) Battery Temp Sensor Volts Out of
Limit
P1479 Transmission Fan Relay Circuit An open or shorted condition detected in the transmission
P1480 PCV Solenoid Circuit An open or shorted condition detected in the PCV
P1482 Catalyst Temperature Sensor Circuit
Shorted Low
Compressed natural gas system pressure above normal
operating range.
Energizing Heated Air Intake does not change intake air
temperature sensor an acceptable amount.
Compressed natural gas pressure sensor reading above
acceptable voltage.
Compressed natural gas pressure sensor reading below
acceptable voltage.
Possible vacuum leak or IAC (AIS) lost steps.
been detected.
detected.
No difference is recognized between the MAP reading at
engine idle and the stored barometric pressure reading.
A prolonged lean condition is detected during Wide Open
Throttle.
MAP Sensor signal does not correlate to Throttle Position
Sensor signal. Possible vacuum leak.
shutoff relay control ckt.
No Z1 or Z2 voltage sensed when the auto shutdown
relay is energized.
sensor has occurred. For PL 2.0L
preparation for Misfire Diagnostics. Probable defective
Crank Sensor.
Lamp circuit.
aspirator test.(was P0411)
aspirator test (was P0411).
Internal temperature sensor input voltage out of an
acceptable range.
fan relay circuit.
solenoid circuit.
Catalyst temperature sensor circuit shorted low.
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