Troubleshooting

(Table 107, contd)
Troubleshooting Test Steps
Values Results
4. Create an Open Circuit at the ECM Connector
A. Disconnect the P2 connector from the ECM.
B. Turn the keyswitch to the ON position. Do not attempt to
start the engine. Wait at least 30 seconds for activation of the
diagnostic codes.
C. Use the electronic service tool to check for an active 100-2
diagnostic code.
Note: Diagnostic codes for all of the engine sensors will be
active with the P2 connector disconnected. Ignore all other
codes and only look for a 100-2 diagnostic code.
D. Turn the keyswitch to the OFF position.
Diagnostic
codes
Result: A 100-2 diagnostic code is active with the P2 connec-
tor disconnected.
The fault is in the wiring between the oil pressure switch and
the P2 ECM connector.
Check all wiring between the oil pressure switch and the ECM.
Refer to the appropriate Electrical Schematic.
Replace the faulty wiring.
Use the electronic service tool to clear all logged diagnostic co-
des and verify that the repair eliminates the fault.
Result: A 100-2 diagnostic code is not active with the wire
disconnected.
Proceed to Test Step 7.
5. Create a Short at the Switch Connector
A. Turn the keyswitch to the OFF position.
B. Disconnect the harness connector for the oil pressure
switch.
C. Fabricate a jumper wire and install the jumper wire be-
tween the harness connector for the oil pressure switch and a
suitable ground.
D. Turn the keyswitch to the ON position. Do not start the
engine.
E. Use the electronic service tool to check for an active 100-2
diagnostic code. Wait at least 10 seconds for activation of the
diagnostic code.
F. Turn the keyswitch to the OFF position.
G. Remove the jumper wire.
Diagnostic
codes
Result: A 100-2 diagnostic code is not active with the jumper
installed.
Replace the oil pressure switch. Refer to Disassembly and As-
sembly, “Engine Oil Pressure Switch - Remove and Install”.
Use the electronic service tool to clear all logged diagnostic co-
des and verify that the repair eliminates the fault.
Result: A 100-2 diagnostic code is active with the jumper
installed.
Proceed to Test Step 6.
(continued)
234 UENR0612-07
Circuit Tests
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