Jeep Cherokee 2000 Service Manual page 1929

XJ
DESCRIPTION AND OPERATION (Continued)
Malfunction Indicator Lamp (MIL) illuminated during engine operation if this DTC was
(M)
recorded (depending if required by CARB and/or EPA). MIL is displayed as an engine icon on
P1282 Fuel Pump Relay Control Circuit
P1283
P1284 (M) Fuel Injection Pump Battery Voltage
P1285 (M) Fuel Injection Pump Controller
P1286 Accelerator Position Sensor (APPS)
P1287 Fuel Injection Pump Controller
P1288 Intake Manifold Short Runner
P1289 Manifold Tune Valve Solenoid Circuit
P1290 CNG Fuel System Pressure Too
P1291 No Temp Rise Seen From Intake
P1291 (M) No Temperature Rise Seen From
P1292 CNG Pressure Sensor Voltage Too
P1293 CNG Pressure Sensor Voltage Too
P1294 (M)
P1295 (M)
P1295 (M) Accelerator Position Sensor (APPS)
P1296 No 5 Volts to MAP Sensor
P1297 (M) No Change in MAP From Start To
P1298 Lean Operation at Wide Open
P1299 Vacuum Leak Found (IAC Fully
P1388 Auto Shutdown Relay Control Circuit
P1388 Auto Shutdown Relay Control Circuit
Idle Select Signal Invalid
Out-Of-Range
Always On
Supply Voltage Too High
Supply Voltage Low
Solenoid Circuit
High
Heaters
Intake Air Heaters
High
Low
Target Idle Not Reached
No 5 Volts to TP Sensor
Supply Voltage Too Low
Run
Throttle
Seated)
instrument panel.
An open or shorted condition detected in the fuel pump
ECM or fuel injection pump module internal fault condition
Fuel injection pump module internal fault condition
detected. Engine power will be derated.
Fuel injection pump module relay circuit failure detected.
ECM or fuel injection pump module internal fault condition
detected. Engine power will be derated.
An open or shorted condition detected in the short runner
An open or shorted condition detected in the manifold
tuning valve solenoid control circuit.
Compressed natural gas system pressure above normal
Energizing Heated Air Intake does not change intake air
temperature sensor an acceptable amount.
Problem detected in intake manifold air heating system.
Compressed natural gas pressure sensor reading above
Compressed natural gas pressure sensor reading below
Target RPM not achieved during drive idle condition.
Possible vacuum leak or IAC (AIS) lost steps.
Loss of a 5 volt feed to the Throttle Position Sensor has
APPS supply voltage input below the minimum
Loss of a 5 volt feed to the MAP Sensor has been
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
MAP Sensor signal does not correlate to Throttle Position
Sensor signal. Possible vacuum leak.
An open or shorted condition detected in the ASD or CNG
An open or shorted condition detected in the auto
EMISSION CONTROL SYSTEMS
relay control circuit.
detected.
Engine power will be derated.
High voltage detected at APPS.
tuning valve circuit.
operating range.
acceptable voltage.
acceptable voltage.
been detected.
acceptable voltage.
detected.
Throttle
shutoff relay control ckt.
shutdown relay circuit.
25 - 11