Symptom:
*NO RESPONSE FROM ECM (SCI ONLY) - DIESEL ONLY
POSSIBLE CAUSES
INSPECT WIRING HARNESS AND CONNECTORS
CHECK ECM POWERS AND GROUNDS
SCI CIRCUIT(S) SHORTED TO GROUND
SCI CIRCUIT(S) SHORTED TO VOLTAGE
SCI CIRCUIT(S) OPEN
SCI CIRCUIT(S) SHORTED TOGETHER
ENGINE CONTROL MODULE
TEST ACTION APPLICABILITY
1 Perform the symptom Checking ECM Power and Ground Circuits in the Driveability
category.
Did the vehicle pass this test?
All
Yes → Go To 2
No → Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIE-
SEL).
2 Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the DRB from the DLC.
Measure the resistance between ground and the SCI Transmit circuit.
Measure the resistance between ground and the SCI Receive circuit.
Is the resistance below 10.0 ohms for both measurements?
All
Yes → Repair the SCI circuit(s) for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIE-
SEL).
No → Go To 3
3 Turn the ignition off.
Disconnect the DRB from the DLC.
Disconnect the ECM harness connectors.
Turn the ignition on.
Measure the voltage of the SCI Transmit circuit at the DLC.
Measure the voltage of the SCI Receive circuit at the DLC.
Is the voltage above 1.0 volt for either measurement?
All
Yes → Repair the SCI circuit(s) for a short to voltage.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIE-
SEL).
No → Go To 4
272
COMMUNICATION
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