P0579-S/C Switch Signal Circuit Signal Voltage Too High - DaimlerChrysler Jeep Grand Cherokee 2002 Service Manual

Symptom:
P0579-S/C SWITCH SIGNAL CIRCUIT SIGNAL VOLTAGE TOO
HIGH
ECM - S/C SIGNAL CIRCUIT OPEN
ECM - S/C SIGNAL CIRCUIT SHORTED TO VOLTAGE
ECM - SENSOR GROUND OPEN
S/C ON/OFF/SET SWITCH
S/C ON/OFF/SET SWITCH SIGNAL CIRCUIT OPEN
S/C SWITCH SIGNAL CIRCUIT SHORTED TO VOLTAGE
SENSOR GROUND OPEN
TEST
1 Turn the ignition off.
Disconnect the S/C ON/OFF/SET button harness connector.
Turn the ignition on.
Measure the voltage of the S/C Switch Signal circuit.
Select the appropriate voltage reading.
Below 4.5 volts.
Between 4.5 and 5.5 volts.
Above 5.5 volts
2 Turn the ignition off.
Disconnect the S/C ON/OFF/SET Switch harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the S/C Switch Signal circuit.
Is the resistance below 10.0 ohms?
Yes → Replace and program the Engine Control Module in accordance
→ Repair the S/C ON/OFF/SET Switch Signal circuit for an open.
No
3 Turn the ignition off.
Disconnect the S/C ON/OFF/SET switch harness connector.
Turn the ignition on.
Connect a jumper wire between the S/C Switch Signal circuit and the Sensor Ground
at the ON/OFF/SET Switch harness connector.
With the DRB, read the S/C Switch volts.
Does the DRB display below 0.5 volt?
Yes → Replace the S/C ON/OFF/SET Switch.
→ Go To 4
No
POSSIBLE CAUSES
ACTION
Go To 2
Go To 3
Go To 5
with the Service Information.
Perform SPEED CONTROL VERIFICATION - VER-4.
Perform SPEED CONTROL VERIFICATION - VER-4.
Perform SPEED CONTROL VERIFICATION - VER-4.
DRIVEABILITY - DIESEL
125
APPLICABILITY
All
All
All