
(Table 90, contd)
Troubleshooting Test Steps
Values
Results
3. Check the ECM Main Relay
A. Turn the keyswitch to the OFF position.
B. Disconnect the ECM main relay.
C. Measure the resistance between Test Point C (terminal 30) and
Test Point D (terminal 87) on the relay.
Open circuit
Result:
The resistance measurement indicates
“
Open Circuit
”
Proceed to Test Step 4.
Result:
The resistance measurement indicates
continuity between Test Point C and Test Point D
on the relay.
Replace the ECM main relay.
Use the electronic service tool to clear all logged
diagnostic codes and verify that the repair elimi-
nates the fault.
4. Check the Wiring Between the Relay and the ECM
A. Turn the keyswitch to the OFF position.
B. Disconnect the ECM main relay. Disconnect the P1 connector.
C. Measure the voltage between Test Point A (terminal 86) and
Test Point B (terminal 85) on the harness connector for the ECM
main relay.
0 V
Result:
The voltage measurement is 0 VDC.
Contact the Dealer Solution Network (DSN).
Result:
The voltage measurement indicates bat-
tery voltage.
The wiring between Test Point B on the harness
connector for the relay and P1:28 is shorted to
ground.
Check all wiring between the ECM main relay and
the P1 connector. Refer to the Electrical Sche-
matic for the application.
Replace the faulty wiring.
Use the electronic service tool to clear all logged
diagnostic codes and verify that the repair elimi-
nates the fault.
Complete the procedure in the order in which the
steps are listed.
If the procedure did not correct the issue, contact the
Dealer Solution Network (DSN).
i06017448
Sensor Signal (Analog, Active)
-
Test
Note: This procedure is applicable to all engine
pressure sensors except the exhaust gas
pressure sensor.
This procedure covers the following codes:
UENR0612
183
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