Troubleshooting

Table 94
Troubleshooting Test Steps
Values Results
1. Inspect Electrical Connectors and Wiring
A. Thoroughly inspect the terminal connections on the P2/J2
ECM connector. Refer to Troubleshooting, “Electrical Con-
nectors - Inspect”.
B. Thoroughly inspect the connector for the exhaust gas pres-
sure sensor. Refer to Troubleshooting, “Electrical Connectors
- Inspect”.
C. Perform a 30 N (6.7 lb) pull test on each of the wires in the
ECM connector and the sensor connectors that are associ-
ated with the exhaust gas pressure sensor.
D. Check the harness for abrasions and for pinch points from
the exhaust gas pressure sensor back to the ECM.
Damaged wire
or connector
Result: A damaged wire or damaged connector was found. A
fuse is blown.
Repair the damaged wire or the damaged connector. Replace
any blown fuses
Use the electronic service tool to clear all logged diagnostic co-
des. Verify that the repair eliminates the fault.
Result: All connectors, pins, and sockets are correctly con-
nected and/or inserted and the harness is free of corrosion, of
abrasion or of pinch points.
Proceed to Test Step 2.
2. Check For Active Diagnostic Codes
A. Turn the keyswitch to the ON position. Wait at least 10 sec-
onds for activation of the diagnostic codes.
B. Verify if any of the diagnostic codes that are listed in Table
93 are active.
Diagnostic
codes
Result: None of the preceding diagnostic codes are active.
If the codes in Table 93 are logged, an intermittent condition
may be causing the logged codes. Refer to Troubleshooting,
“Electrical Connectors - Inspect”.
Result: A 1209-3 or a 1209-4 diagnostic code is active.
Proceed to Test Step 3.
3. Check the Supply Voltage 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. Do not start the
engine.
D. Measure the voltage between terminal 1 and terminal 2 on
the harness connector for the exhaust gas pressure sensor.
The voltage measurement should be 5.0 ± 0.1 VDC.
E. Turn the keyswitch to the OFF position.
F. Reconnect the sensor.
4.9 V to 5.1 V Result: The voltage measurement is not within the expected
range.
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 in or-
der to clear all logged diagnostic codes and then verify that the
repair eliminates the fault.
Result: The voltage measurement is within the expected
range.
Proceed to Test Step 4.
(continued)
UENR0612-07 199
Circuit Tests
This document has been printed from SPI2. NOT FOR RESALE