DaimlerChrysler Jeep Grand Cherokee 2002 Service Manual page 218

DRIVEABILITY - DIESEL
P2120-ACC PEDAL POSITION SENSOR 1 CKT PLAUSIBILITY —
TEST
13 Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Remove the ASD Relay from the PDC.
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.
→ Replace and program the Engine Control Module in accordance
No
14 Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the 5-volt Supply (Sensor Reference Voltage A on Sensor
#2) circuit.
Is the resistance below 10.0 ohms?
Yes → Go To 15
→ Repair the 5-volt Supply (Sensor Reference Voltage A on Sensor
No
15 Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between the 5-volt Supply (Sensor Reference Voltage A on
Sensor #2) circuit and the Sensor Ground circuit at the APP Sensor harness
connector.
Is the resistance above 1000 ohms?
Yes → Go To 16
→ Repair the 5-volt Supply (Sensor Reference Voltage A on Sensor
No
16 Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the 5-volt Supply (Sensor Reference
Voltage A on Sensor #2) circuit.
Is the resistance below 1000 ohms?
Yes → Repair the 5-volt Supply (Sensor Reference Voltage A on Sensor
→ Go To 17
No
ACTION
Perform ROAD TEST VERIFICATION - VER-2.
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
#2) circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
#2) circuit for a short to the Sensor Ground circuit.
Perform ROAD TEST VERIFICATION - VER-2.
#2) circuit for a short to ground.
Perform ROAD TEST VERIFICATION - VER-2.
210
Continued
APPLICABILITY
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