TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the ECM harness connectors.
Remove the ASD/Diesel Power Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 in the ASD/Diesel Power
Relay connector.
Using a 12-volt test light connected to ground, check the ASD Relay Output circuit in
ECM harness connector C1 cavities 2 and 28.
Did the test light illuminate for both circuits?
All
Yes
→
Go To
5
No
→
Repair the ASD Relay Output circuit(s) for an open.
Perform ROAD TEST VERIFICATION - VER-2.
5
Disconnect the PCM harness connectors.
Using a 12-volt test light connected to ground, check the PCM Battery Supply circuit
in PCM harness connector C1 cavity 22.
Is the test light on?
All
Yes
→
Go To
6
No
→
Repair the PCM Battery Supply circuit(s) for an open.
Perform ROAD TEST VERIFICATION - VER-2.
6
Disconnect the PCM harness connectors.
Using a 12-volt test light connected to 12-volts, check both PCM Ground circuits in
PCM harness connector C1 cavities 31 and 32.
Did the test light illuminate for both cavities?
All
Yes
→
Go To
7
No
→
Repair the PCM Ground circuit(s) for an open.
Perform ROAD TEST VERIFICATION - VER-2.
7
Turn the ignition off.
Remove the ASD/Diesel Power Relay from the PDC.
Disconnect the PCM harness connectors.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD/Diesel Power
Relay connector.
Using a 12-volt test light connected to ground, check the ASD Relay Output circuit in
PCM harness connectors C1 cavity 2 and C3 cavity 12.
Did the test light illuminate for both circuits?
All
Yes
→
Test Complete.
No
→
Repair the ASD Relay Output circuit(s) for an open.
Perform ROAD TEST VERIFICATION - VER-2.
167
DRIVEABILITY - DIESEL
*CHECKING THE ECM AND PCM POWER AND GROUND CIRCUITS —
Continued