Jeep XJ. Manual — part 629
TEST
ACTION
APPLICABILITY
13
Turn the ignition off.
Disconnect the PCM harness connectors.
Turn the ignition on.
With the DRB, select Engine, Bosch Controller then Inputs/Outputs.
While reading the A/C Switch input, use a jumper wire to connect the A/C Switch
Signal circuit to ground at the PCM harness connector.
Does the DRB display A/C Switch ON?
All
Yes
→
Replace and program the PCM in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
14
Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the A/C Switch Signal circuit.
Is the resistance below 100.0 ohms?
All
Yes
→
Repair the A/C Switch Signal circuit for a short to ground.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
15
Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the ECM harness connectors.
Measure the resistance of the A/C Switch Signal circuit.
Is the resistance below 10.0 ohms?
All
Yes
→
Replace and program the ECM in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Repair the A/C Switch Signal circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
16
Turn the ignition off.
Disconnect the A/C Heater Control harness connectors.
Disconnect the PCM harness connectors.
Turn the ignition on.
Measure the voltage of the A/C Select Switch Sense circuit.
Is the voltage below 1.0 volt?
All
Yes
→
No
→
Repair the A/C Select Switch Sense circuit for a short to voltage.
Perform ROAD TEST VERIFICATION - VER-2.
17
Turn the ignition off.
Disconnect the A/C Heater Control harness connectors.
Disconnect the PCM harness connectors.
Measure the resistance between ground and the A/C Select Switch Sense circuit.
Is the resistance below 100.0 ohms?
All
Yes
→
Repair the A/C Select Switch Sense circuit for a short to ground.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
168
DRIVEABILITY - DIESEL
*CHECKING THE A/C SYSTEM —
Continued
TEST
ACTION
APPLICABILITY
18
Turn the ignition off.
Disconnect the A/C Heater Control harness connectors.
Disconnect the PCM harness connectors.
Measure the resistance of the A/C Select Switch Sense circuit.
Is the resistance below 10.0 ohms?
All
Yes
→
No
→
Repair the A/C Select Switch Sense circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
19
Turn the ignition off.
Disconnect the A/C Heater Control harness connectors.
Turn the ignition on.
With the DRB, select Engine, JTEC then Inputs/Outputs
Start the Engine.
Connect a jumper wire between the A/C Select Switch Sense circuit and ground at the
A/C Heater Control harness connector.
With the DRB, read the A/C Select Switch.
Does the DRB display A/C Select Switch YES?
All
Yes
→
Refer to symptom list for problems related to A/C Select Switch
operation.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Replace and program the PCM in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.
169
DRIVEABILITY - DIESEL
*CHECKING THE A/C SYSTEM —
Continued
Symptom:
*CHECKING THE ACCELERATOR PEDAL POSITION SENSOR
CALIBRATION
POSSIBLE CAUSES
APP SENSOR
APP SENSOR - IDLE
APP SENSOR - WOT
TEST
ACTION
APPLICABILITY
1
NOTE: Ensure the Accelerator pedal is free from any restriction or binding
before continuing.
Turn the ignition on.
While back probing, measure the voltage of the APP Sensor Signal circuit at the
ECM.
NOTE: The accelerator pedal must be released for this step.
Is the voltage below 1.0 volt?
All
Yes
→
No
→
Replace the Accelerator Pedal Position Sensor in accordance with
the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
2
Turn the ignition on.
While back probing, measure the voltage of the APP Sensor Signal circuit at the
ECM.
Monitor the voltmeter while slowly pressing the accelerator pedal completely down.
Did the voltage increase smoothly with pedal travel?
All
Yes
→
No
→
Replace the Accelerator Pedal Position Sensor in accordance with
the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
3
Turn the ignition on.
While back probing, measure the voltage of the APP Sensor Signal circuit at the
ECM.
Press the accelerator pedal completely down.
Is the voltage above 3.5 volts?
All
Yes
→
Test Complete.
No
→
Replace the Accelerator Pedal Position Sensor in accordance with
the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
170
DRIVEABILITY - DIESEL
Symptom:
*CHECKING THE CHECK ENGINE LAMP OPERATION
POSSIBLE CAUSES
ACTUATE CHECK ENGINE LAMP
CHECK ENGINE CONTROL CIRCUIT SHORTED TO VOLTAGE
CHECK ENGINE LAMP BULB
ENGINE CONTROL MODULE
INSTRUMENT CLUSTER
INSTRUMENT CLUSTER - LAMP NEVER ON
POWERTRAIN CONTROL MODULE - CONTROL SHORTED TO VOLTAGE
POWERTRAIN CONTROL MODULE - INTERNAL FAULT
CHECK ENGINE LAMP CONTROL CIRCUIT SHORTED TO GROUND
CHECK ENGNINE LAMP CONTROL CIRCUIT OPEN
POWERTRAIN CONTROL MODULE - CONTROL SHORTED TO GROUND
TEST
ACTION
APPLICABILITY
1
Turn the ignition on and observe the Check Engine Lamp.
Did the Check Engine Lamp illuminate for approximately 2 seconds then go out for
a bulb check?
All
Yes
→
No
→
2
Turn the ignition on.
With the DRB, actuate the Diag/Glow Plug Lamp.
Did the Check Engine Lamp illuminate?
All
Yes
→
The Check Engine Lamp System is working properly.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
3
Turn the ignition off.
Disconnect the ECM harness connectors.
Turn the ignition on.
Measure the voltage of the Check Engine Lamp Control circuit.
Is the voltage between 4.8 and 5.5 volts?
All
Yes
→
Above
Below
171
DRIVEABILITY - DIESEL
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