Troubleshooting

Table 115
Troubleshooting Test Steps
Values Results
1. Verify All Active and Recently Logged 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
114 are active or recently logged.
Diagnostic
codes
Result: None of the preceding diagnostic codes are active or
recently logged.
The fault may be intermittent. Refer to Troubleshooting, “Elec-
trical Connectors - Inspect” in order to identify intermittent
faults.
Result: One or more of the preceding diagnostic codes are ac-
tive or recently logged.
Proceed to Test Step 2.
2. Inspect Electrical Connectors And Wiring
A. Thoroughly inspect the terminal connections on the P2/J2
ECM connectors.
B. Thoroughly inspect the connectors for the valves.
C. Refer to Troubleshooting, “Electrical Connectors -
Inspect”.
D. Perform a 30 N (6.7 lb) pull test on each of the wires in the
ECM connector and the valve connectors that are associated
with the active diagnostic code.
E. Check the harness for abrasions and for pinch points from
the valves 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.
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 3.
3. Measure the Sensor Supply Voltage at the Valve
Connector
A. Turn the keyswitch to the OFF position.
B. Disconnect the suspect valve from the engine harness.
C. Turn the keyswitch to the ON position.
D. Measure the voltage at the harness connector for the valve
from the 5 VDC supply terminal of the position sensor to the
sensor ground terminal.
4.9 v to 5.1 V Result: The measured voltage is not within the expected
range.
The fault is in the wiring between the suspect valve and the
ECM P2 connector.
Check all wiring between the suspect valve and the ECM. Re-
fer to the appropriate Electrical Schematic.
Replace the suspect wiring.
Use the electronic service tool to clear all logged diagnostic co-
des and verify that the repair eliminates the fault.
Result: The measured voltage is within the expected range.
Proceed to Test Step 4.
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.
Diagnostic
codes
Result: An XX-4 diagnostic code is active at this time.
Proceed to Test Step 5.
Result: An XX-3 diagnostic code is active at this time.
Proceed to Test Step 7.
(continued)
248 UENR0612-07
Circuit Tests
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