Jeep Liberty KJ. Manual — part 859
10.
APP SENSOR SIGNAL CIRCUIT OPEN
Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the APP Sensor Signal circuit.
Is the resistance below 10.0 ohms?
Yes
>> Go To 11
No
>> Repair the APP Sensor Signal circuit for an open
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
11.
APP SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the APP Sensor Signal cir-
cuit.
Is the resistance below 1000 ohms?
Yes
>> Repair the APP Sensor Signal circuit for a short to ground.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
No
>> Go To 12
12.
APP SENSOR SIGNAL CIRCUIT SHORTED TO THE SENSOR GROUND CIRCUIT
Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between the APP Sensor Signal circuit and the
Sensor Ground circuit at the APP Sensor harness connector.
Is the resistance below 1000 ohms?
Yes
>> Repair the APP Sensor Signal and Sensor Ground circuits
for a short together.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
No
>> Go To 13
9 - 1394
ENGINE DIESEL DIAG
KJ
13.
APP SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Remove the ASD Relay.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD
Relay connector.
Turn the ignition on.
Measure the voltage of the APP Sensor Signal circuit.
Is the voltage above 1.0 volt?
Yes
>> Repair the APP Sensor Signal circuit for a short to voltage.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
No
>> Replace and program the Engine Control Module in accor-
dance with the Service Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
14.
APP SENSOR 5-VOLT SUPPLY CIRCUITS OPEN
Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the Accelerator Pedal Position Sensor 5-volt
Supply circuit.
Is the resistance below 10.0 ohms?
Yes
>> Go To 15
No
>> Repair the Accelerator Pedal Position Sensor 5-Volt Supply
circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
KJ
ENGINE DIESEL DIAG
9 - 1395
15.
APP SENSOR 5-VOLT SUPPLY CIRCUIT SHORTED TO SENSOR GROUND
Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between the Accelerator Pedal Position Sensor
5-Volt Supply circuit and both Sensor Ground circuits in the APP Sensor
harness connector.
Is the resistance above 1000 ohms?
Yes
>> Go To 16
No
>> Repair the 5-Volt Supply circuit for a short to the Sensor
Ground circuit.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
16.
APP SENSOR 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the Accelerator Pedal
Position Sensor 5-volt Supply circuit.
Is the resistance below 1000 ohms?
Yes
>> Repair the Accelerator Pedal Position Sensor 5-Volt Supply
circuit for a short to ground.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
No
>> Go To 17
9 - 1396
ENGINE DIESEL DIAG
KJ
17.
APP SENSOR 5-VOLT SUPPLY SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Remove the ASD Relay.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD
Relay connector.
Turn the ignition on.
Measure the voltage of the Accelerator Pedal Position Sensor 5-Volt
Supply circuit in the ECM harness connector.
Is the voltage above 1.0 volt?
Yes
>> Repair the Accelerator Pedal Position Sensor 5-Volt Supply
circuit for a short to voltage.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
No
>> Replace and program the Engine Control Module in accor-
dance with the Service Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
KJ
ENGINE DIESEL DIAG
9 - 1397
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