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Symptom:
P0579-S/C SWITCH SIGNAL CIRCUIT PLAUSIBILITY
INTERMITTENT CONDITION
HIGH RESISTANCE IN THE S/C SWITCH SIGNAL CIRCUIT
HIGH RESISTANCE IN THE S/C SWITCH GROUND CIRCUIT
S/C SWITCHES
ENGINE CONTROL MODULE
TEST
1
Turn the ignition on.
With the DRB, erase ECM DTCs.
Test drive the vehicle and activate the Speed Control.
At some point during the test drive, actuate each of the S/C Switch buttons.
With the DRB, read ECM DTCs.
Did this DTC set again?
Yes → Go To 2
→ Go To 5
No
2
Turn the ignition off.
Disconnect the S/C Switch harness connectors.
Disconnect the ECM harness connectors.
Measure the resistance of the S/C Switch Signal circuit.
Is the resistance below 5.0 ohms?
Yes → Go To 3
→ Repair the S/C Switch Signal circuit for high resistance.
No
3
Turn the ignition off.
Disconnect the S/C Switch harness connectors.
Disconnect the ECM harness connectors.
Measure the resistance of the S/C Switch Ground circuit.
Is the resistance below 5.0 ohms?
Yes → Go To 4
→ Repair the S/C Switch Ground circuit for high resistance.
No
POSSIBLE CAUSES
ACTION
Perform SPEED CONTROL VERIFICATION - VER-4.
Perform SPEED CONTROL VERIFICATION - VER-4.
DRIVEABILITY - DIESEL
123
APPLICABILITY
All
All
All
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