
Table 92
Troubleshooting Test Steps
Values
Results
1. Inspect Electrical Connectors and Wiring
A. Thoroughly inspect the terminal connections on the P2/J2
and P1/J1 ECM connectors. Refer to Troubleshooting, “Elec-
trical Connectors - Inspect”.
B. Thoroughly inspect the connectors for the engine pressure
sensors. 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.
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
91 are active.
Diagnostic
codes
Result:
A 108-3 or 108-4 diagnostic code is active.
Proceed to Test Step 9.
Result:
An XXXX-3 or an XXXX-4 diagnostic code is active for
one or more of the other pressure sensors.
A 102-20 or 102-21 diagnostic code is active.
Proceed to Test Step 3.
Result:
A 157-10 diagnostic code is active or recently logged.
An intermittent connection exists in the circuit for the fuel rail
pressure sensor.
Refer to Troubleshooting, “Electrical Connectors - Inspect” in
order to identify intermittent connections.
3. Check the Supply Voltage at the Sensor Connector
A. Turn the keyswitch to the OFF position.
B. Disconnect the connector for the suspect sensor.
C. Turn the keyswitch to the ON position. Do not start the
engine.
D. Measure the voltage between the 5 VDC supply terminal
and the ground terminal on the harness connector for the sus-
pect 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 suspect sensor and the
P2 ECM connector.
Repair the faulty wiring or replace the faulty wiring. Use the
electronic service tool in order to clear all logged diagnostic co-
des 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
187
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