DaimlerChrysler Jeep Grand Cherokee 2002 Service Manual page 134

DRIVEABILITY - DIESEL
P0579-S/C SWITCH SIGNAL CIRCUIT SIGNAL VOLTAGE TOO HIGH —
Continued
TEST
4 Turn the ignition off.
Disconnect the S/C ON/OFF/SET Switch harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the Sensor Ground circuit.
Is the resistance below 10.0 ohms?
Yes → Replace and program the Engine Control Module in accordance
→ Repair the Sensor Ground circuit for an open.
No
5 Turn the ignition off.
Disconnect the S/C ON/OFF/SET Switch harness connector.
Disconnect the ECM harness connectors.
Turn the ignition on.
Measure the voltage of the S/C Switch Signal circuit.
Is the voltage above 1.0 volt?
Yes → Repair the S/C ON/OFF/SET Switch Signal circuit for a short to
→ Replace and program the Engine Control Module in accordance
No
ACTION
with the Service Information.
Perform SPEED CONTROL VERIFICATION - VER-4.
Perform SPEED CONTROL VERIFICATION - VER-4.
voltage.
Perform SPEED CONTROL VERIFICATION - VER-4.
with the Service Information.
Perform SPEED CONTROL VERIFICATION - VER-4.
126
APPLICABILITY
All
All