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Symptom:
P1242-CAN BUS MUTE
When Monitored and Set Condition:
P1242-CAN BUS MUTE
When Monitored: With the ignition on.
Set Condition: The ECM does not detect any CAN Bus messages.
ENGINE CONTROL MODULE
INTERMITTENT CONDITION
CAN C BUS CIRCUIT OPEN
TEST
1
Turn the ignition on.
With the DRB, erase ECM DTCs.
Start the engine.
Monitor the DRB for ECM DTCs.
Did this DTC set again?
Yes → Go To 2
→ Go To 3
No
2
NOTE: At any time, if one of the measurements is above 5.0 ohms, answer the
question.
Turn the ignition off.
Disconnect the TCM harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the CAN C Bus (+) circuit between the ECM and the TCM
harness connectors.
Measure the resistance of the CAN C Bus (-) circuit between the ECM and the TCM
harness connectors.
Disconnect the CAB harness connector.
Measure the resistance of the CAN C Bus (+) circuit between the ECM and CAB
harness connectors.
Measure the resistance of the CAN C Bus (-) circuit between the ECM and CAB
harness connectors.
Is the resistance below 5.0 ohms for each measurement?
Yes → Replace and program the Engine Control Module in accordance
→ Repair the CAN C Bus circuit that measured greater than 5.0
No
POSSIBLE CAUSES
ACTION
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
ohms for an open.
Perform ROAD TEST VERIFICATION - VER-2.
DRIVEABILITY - DIESEL
177
APPLICABILITY
All
All
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