Jeep Cherokee 2000 Service Manual - page 1929
(M)
Malfunction Indicator Lamp (MIL) illuminated during engine operation if this DTC was
recorded (depending if required by CARB and/or EPA). MIL is displayed as an engine icon on
instrument panel.
P1282
Fuel Pump Relay Control Circuit
An open or shorted condition detected in the fuel pump
relay control circuit.
P1283
Idle Select Signal Invalid
ECM or fuel injection pump module internal fault condition
detected.
P1284 (M)
Fuel Injection Pump Battery Voltage
Out-Of-Range
Fuel injection pump module internal fault condition
detected. Engine power will be derated.
P1285 (M)
Fuel Injection Pump Controller
Always On
Fuel injection pump module relay circuit failure detected.
Engine power will be derated.
P1286
Accelerator Position Sensor (APPS)
Supply Voltage Too High
High voltage detected at APPS.
P1287
Fuel Injection Pump Controller
Supply Voltage Low
ECM or fuel injection pump module internal fault condition
detected. Engine power will be derated.
P1288
Intake Manifold Short Runner
Solenoid Circuit
An open or shorted condition detected in the short runner
tuning valve circuit.
P1289
Manifold Tune Valve Solenoid Circuit
An open or shorted condition detected in the manifold
tuning valve solenoid control circuit.
P1290
CNG Fuel System Pressure Too
High
Compressed natural gas system pressure above normal
operating range.
P1291
No Temp Rise Seen From Intake
Heaters
Energizing Heated Air Intake does not change intake air
temperature sensor an acceptable amount.
P1291 (M)
No Temperature Rise Seen From
Intake Air Heaters
Problem detected in intake manifold air heating system.
P1292
CNG Pressure Sensor Voltage Too
High
Compressed natural gas pressure sensor reading above
acceptable voltage.
P1293
CNG Pressure Sensor Voltage Too
Low
Compressed natural gas pressure sensor reading below
acceptable voltage.
P1294 (M)
Target Idle Not Reached
Target RPM not achieved during drive idle condition.
Possible vacuum leak or IAC (AIS) lost steps.
P1295 (M)
No 5 Volts to TP Sensor
Loss of a 5 volt feed to the Throttle Position Sensor has
been detected.
P1295 (M)
Accelerator Position Sensor (APPS)
Supply Voltage Too Low
APPS supply voltage input below the minimum
acceptable voltage.
P1296
No 5 Volts to MAP Sensor
Loss of a 5 volt feed to the MAP Sensor has been
detected.
P1297 (M)
No Change in MAP From Start To
Run
No difference is recognized between the MAP reading at
engine idle and the stored barometric pressure reading.
P1298
Lean Operation at Wide Open
Throttle
A prolonged lean condition is detected during Wide Open
Throttle
P1299
Vacuum Leak Found (IAC Fully
Seated)
MAP Sensor signal does not correlate to Throttle Position
Sensor signal. Possible vacuum leak.
P1388
Auto Shutdown Relay Control Circuit
An open or shorted condition detected in the ASD or CNG
shutoff relay control ckt.
P1388
Auto Shutdown Relay Control Circuit
An open or shorted condition detected in the auto
shutdown relay circuit.
XJ
EMISSION CONTROL SYSTEMS
25 - 11
DESCRIPTION AND OPERATION (Continued)