Troubleshooting

(Table 94, 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 exhaust gas pressure
sensor.
C. Fabricate a jumper wire that is 150 mm (6 inch) long. In-
stall the jumper wire between terminal 1 and terminal 3 on the
harness connector for the exhaust gas pressure 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 1209-
3 diagnostic code for the suspect sensor.
F. Turn the keyswitch to the OFF position. Remove the jumper
wire.
Diagnostic
codes
Result: A 1209-3 diagnostic code was active with the jumper
installed.
Temporarily connect a new exhaust gas pressure sensor to the
harness, but do not install the new sensor in the engine. Use
the electronic service tool in order to verify that the repair elimi-
nates the fault and then permanently install the new sensor.
Use the electronic service tool to clear all logged diagnostic co-
des and verify that the repair eliminates the fault.
Result: A 1209-4 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 J2:43 and J2:12 .
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 a 1209 diagnostic code.
E. Use the electronic service tool to check for an active 1209-
3 diagnostic code for the suspect sensor.
F. Turn the keyswitch to the OFF position. Remove the jumper
wire.
Diagnostic
codes
Result: A 1209-3 diagnostic code was active with the jumper
installed.
The fault is in the wiring between the exhaust gas pressure
sensor and the P2 ECM connector.
Check all wiring between the 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: A 1209-4 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.
UENR0612-07 201
Circuit Tests
This document has been printed from SPI2. NOT FOR RESALE