TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the ECM harness connectors.
Remove the ECM/PCM Relay from the IPM.
Connect a jumper wire between cavity 30 and cavity 87 in the ECM/PCM Relay
connector.
Using a 12-volt test light connected to ground, check the ECM/PCM Relay Output
circuit in ECM harness connector C1 cavities 4 and 5.
Did the test light illuminate for both circuits?
All
Yes
→ Go To 5
No
→ Repair the ECM/PCM Relay Output circuit(s) for an open.
Perform ROAD TEST VERIFICATION - VER-2.
5
Turn the ignition off.
Install a substitute relay in place of the ECM/PCM Relay.
Turn the ignition on.
With the DRB, attempt to communicate with the ECM.
With the DRB, can you communicate with the ECM?
All
Yes
→ Replace the ECM/PCM Relay.
Perform ROAD TEST VERIFICATION - VER-2.
No
→ Go To 6
6
Turn the ignition off.
Disconnect the ECM harness connectors.
Remove the ECM/PCM Relay from the IPM.
Connect a jumper wire between cavity 30 and cavity 87 in the ECM/PCM Relay
connector.
Using a 12-volt test light connected to ground, check the ECM/PCM Relay Output
circuit in ECM harness connector C1 cavities 4 and 5.
Does the test light illuminate brightly?
All
Yes
→ Go To 7
No
→ Repair the ECM/PCM Relay Control circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
7
Turn the ignition off.
Disconnect the ECM harness connectors.
Remove the ECM/PCM Relay from the IPM.
Connect a jumper wire between cavity 30 and cavity 87 of the ECM/PCM Relay
connector in the IPM.
Turn the ignition on.
Measure the voltage of the ECM/PCM Relay Control circuit.
Is the voltage above 1.0 volt?
All
Yes
→ Repair the ECM/PCM Relay Control circuit for a short to voltage.
Perform ROAD TEST VERIFICATION - VER-2.
No
→ Test Complete.
207
DRIVEABILITY - DIESEL
*CHECKING THE ECM POWER AND GROUND CIRCUITS —
Continued