TEST
ACTION
APPLICABILITY
7
Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the Check Engine Lamp Control circuit.
Is the resistance above 100 kohms?
All
Yes
→
Go To
8
No
→
Repair the Check Engine Lamp Control circuit for a short to
ground.
Perform ROAD TEST VERIFICATION - VER-2.
8
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the PCM harness connectors.
Measure the resistance of the Check Engine Lamp Control circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
Go To
9
No
→
Repair the Check Engine Lamp Control circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
9
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
10
Turn the ignition off.
Remove and inspect the Check Engine Lamp bulb from the Instrument Cluster.
Is the bulb OK?
All
Yes
→
Replace the Instrument Cluster in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Replace the Check Engine Lamp bulb.
Perform ROAD TEST VERIFICATION - VER-2.
236
DRIVEABILITY - DIESEL
*CHECKING THE CHECK ENGINE LAMP OPERATION —
Continued