Troubleshooting

(Table 94, contd)
Troubleshooting Test Steps
Values Results
4. Verify the Type of Active Diagnostic Code
A. Turn the keyswitch to the ON position. Wait at least 10 sec-
onds for activation of the diagnostic codes.
B. Use the electronic service tool to check for active diagnos-
tic codes. Record all active diagnostic codes.
C. Determine if the fault is related to an open circuit diagnos-
tic code or a short circuit diagnostic code.
Diagnostic
codes
Result: A 1209-3 diagnostic code is active.
Proceed to Test Step 5.
Result: A 1209-4 diagnostic code is active.
Proceed to Test Step 7.
Result: Neither of the preceding diagnostic codes are active.
An intermittent fault may exist.
Refer to Troubleshooting, “Electrical Connectors - Inspect” in
order to identify intermittent faults.
5. Create An Open Circuit at the Sensor Connector
A. Turn the keyswitch to the OFF position.
B. Disconnect the connector for the exhaust gas pressure
sensor.
C. Turn the keyswitch to the ON position. Wait for at least 10
seconds for activation of the diagnostic codes.
D. Use the electronic service tool to check the “Active Diag-
nostic Code” screen. Check for an active 1209-4 diagnostic
code.
Diagnostic
codes
Result: A 1209-4 diagnostic code became active after discon-
necting the sensor.
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 in order to clear all logged diag-
nostic codes.
Clear all logged diagnostic codes.
Result: The 1209-3 diagnostic code is still active with the ex-
haust gas pressure sensor disconnected.
Proceed to Test Step 6.
6. Create an Open Circuit at the ECM Connector
A. Turn the keyswitch to the OFF position.
B. Disconnect the P2 connector from the ECM.
C. Turn the keyswitch to the ON position. Wait at least 30 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 and only look for a 1209 diagnostic code.
D. Access the “Active Diagnostic Codes” screen on the elec-
tronic service tool and check for an active 1209-4 diagnostic
code for the suspect sensor.
E. Turn the keyswitch to the OFF position.
Diagnostic
Codes
Result: A 1209-4 diagnostic code became active after the P2
connector was disconnected.
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: The 1209-3 diagnostic code is still active with the P2
connector disconnected.
Proceed to Test Step 9.
(continued)
200 UENR0612-07
Circuit Tests
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