Troubleshooting

(Table 92, contd)
Troubleshooting Test Steps
Values Results
7. Create a Short at the Sensor Connector
A. Turn the keyswitch to the OFF position.
B. Disconnect the connector for the suspect sensor.
C. Fabricate a jumper wire that is 150 mm (6 inch) long. In-
stall the jumper wire between the sensor signal terminal and
the sensor ground terminal on the harness connector for the
suspect sensor.
D. Turn the keyswitch to the ON position. Wait at least 10 sec-
onds for activation of the diagnostic codes.
E. Use the electronic service tool to check for an active
XXXX-4 diagnostic code for the suspect sensor.
F. Turn the keyswitch to the OFF position. Remove the jumper
wire.
Diagnostic
codes
Result: An XXXX-4 diagnostic code was active with the jump-
er installed.
Temporarily connect a new pressure sensor to the harness,
but do not install the new sensor in the engine. Use the elec-
tronic service tool in order to verify that the repair eliminates
the fault and then permanently install the new sensor.
If the fuel rail is replaced, use the electronic service tool to per-
form the “Rail Pressure Valve Learn Reset” .
Use the electronic service tool to clear all logged diagnostic co-
des and verify that the repair eliminates the fault.
Result: An XXXX-3 diagnostic code is still active with the
jumper installed.
Proceed to Test Step 8.
8. Create a Short Circuit at the ECM
A. Turn the keyswitch to the OFF position.
B. Disconnect the P2 connector from the ECM.
C. Fabricate a jumper wire that is 150 mm (6 inch) long. In-
stall the jumper wire between the suspect sensor signal pin
and the sensor ground pin on the J2 connector.
D. Turn the keyswitch to the ON position. Wait at least 10 sec-
onds for activation of the diagnostic codes.
Note: Diagnostic codes for all of the engine sensors will be
active with the P2 connector disconnected. Ignore all other di-
agnostic codes. Only look for codes that relate to the suspect
sensor.
E. Use the electronic service tool to check for an active
XXXX-4 diagnostic code for the suspect sensor.
F. Turn the keyswitch to the OFF position. Remove the jumper
wire.
Diagnostic
codes
Result: An XXXX-3 diagnostic code was active with the jump-
er installed.
The fault is in the wiring between the suspect sensor and the
P2 ECM connector.
Check all wiring between the suspect sensor 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: An XXXX-3 diagnostic code is still active with the
jumper installed.
Proceed to Test Step 9.
9. Check if a Replacement ECM Eliminates the Fault
A. Contact the Dealer Solution Network (DSN).
B. If the DSN recommends the use of a replacement ECM, in-
stall a replacement ECM. Refer to Troubleshooting, “Replac-
ing the ECM”.
C. Use the electronic service tool to recheck the system for
active diagnostic codes.
Diagnostic
codes
Result: There are no active diagnostic codes with the replace-
ment ECM.
Reconnect the suspect ECM. If the fault returns with the sus-
pect ECM, replace the ECM.
Use the electronic service tool in order to clear all logged diag-
nostic codes and then verify that the repair eliminates the fault.
Result: The diagnostic code is still present with the replace-
ment ECM.
Contact the DSN.
196 UENR0612-07
Circuit Tests
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