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P1242-CAN BUS MESSAGE MISSING —
TEST
2
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the TCM harness connectors.
Measure and note the resistance of the CAN C Bus (+) circuit between the ECM
harness connector and the TCM harness connector.
Measure and note the resistance of the CAN C Bus (-) circuit between the ECM
harness connector and the TCM harness connector.
Is the resistance below 10.0 ohms for each measurement?
Yes → Go To 3
→ Repair the CAN C Bus circuit(s) for an open.
No
3
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the TCM harness connectors.
Disconnect the CAB harness connector.
Measure and note the resistance between ground and the CAN C Bus (+) circuit at
the TCM harness connector.
Measure and note the resistance between ground and the CAN C Bus (-) circuit at the
TCM harness connector.
Is the resistance above 1000 ohms for each measurement?
Yes → Go To 4
→ Repair the CAN C Bus circuit(s) for a short to ground.
No
4
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the TCM harness connectors.
Disconnect the CAB harness connector.
Measure and note the resistance between the CAN C Bus (+) circuit and the CAN C
Bus (-) circuit at the TCM harness connector.
Is the resistance above 1000 ohms?
Yes → Go To 5
→ Repair the CAN C Bus circuit(s) for a short together.
No
5
Turn the ignition off to the lock position.
Disconnect the ECM harness connector.
NOTE: Make sure both the TCM and the CAB harness connectors are
connected before taking this measurement.
Measure the resistance between the CAN C Bus (+) circuit and the CAN C Bus (-)
circuit in the ECM harness connector.
Is the resistance 60.0 ohms, ± 3.0 ohms?
Yes → Go To 6
→ Go To 7
No
ACTION
Perform ROAD TEST VERIFICATION - VER-2.
Perform ROAD TEST VERIFICATION - VER-2.
Perform ROAD TEST VERIFICATION - VER-2.
DRIVEABILITY - DIESEL
Continued
175
APPLICABILITY
All
All
All
All
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