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DRIVEABILITY - DIESEL
P1242-CAN BUS MESSAGE MISSING —
TEST
6
Turn the ignition off.
Replace and program the Transmission Control Module in accordance with the
Service Information.
Turn the ignition on.
With the DRB, erase all ECM and TCM DTC's.
Perform several engine run cycles, turning the engine off for at least 20 seconds
between each cycle.
With the DRBIII , read the ECM DTCs.
Does the DRBIII display this DTC?
Yes → Replace and program the Engine Control Module in accordance
→ Test Complete.
No
7
Turn the ignition off to the lock position.
Disconnect the CAB harness connector.
NOTE: Make sure both the TCM and the ECM harness connectors are
connected before taking this measurement.
Measure the resistance between the CAN Bus (+) circuit and the CAN Bus (-) circuit
in the CAB harness connector.
Is the resistance 120 ohms, ± 2.0 ohms?
Yes → Replace the CAB Module.
→ Replace the Transmission Control Module.
No
8
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
With the engine running at normal operating temperature, monitor the DRB
parameters related to the DTC while wiggling the wiring harness. Look for param-
eter values to change and/or a DTC to set.
Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the
conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?
Yes → Repair as necessary.
→ Test Complete.
No
ACTION
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
Perform ROAD TEST VERIFICATION - VER-2.
Perform ROAD TEST VERIFICATION - VER-2.
Perform ROAD TEST VERIFICATION - VER-2.
Perform ROAD TEST VERIFICATION - VER-2.
Continued
176
APPLICABILITY
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