Illustration 75 g02716382
View of the pin location on the P1 connector for the
air filter restriction switch
(87) Air filter restriction switch
Table 111
Troubleshooting Test Steps Values Results
1. Inspect Electrical Connectors and Wiring
A. Thoroughly inspect the terminal connections on the P1/J1
connector.
B. Thoroughly inspect the connector for the air filter restriction
switch.
C. Refer to Troubleshooting, “Electrical Connectors - Inspect”.
D. Perform a 30 N (6.7 lb) pull test on each of the wires in the
connectors that are associated with the air filter restriction
switch.
E. Check the harness for abrasions and for pinch points from
the switch 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 2.
2. Check for Active or Recently Logged Diagnostic Codes
A. Turn the keyswitch to the OFF position.
B. Connect the electronic service tool to the diagnostic
connector.
C. Turn the keyswitch to the ON position. Do not start the
engine.
D. Use the electronic service tool to check whether a “Nor-
mally Open” or “Normally Closed” air filter restriction switch
is installed in the application.
E. Check for any active or recently logged diagnostic codes.
Wait at least 10 seconds for activation of the diagnostic codes.
Diagnostic
codes
Result: A 107-2 diagnostic code is not active.
If the diagnostic code is recently logged, an intermittent fault
may exist.
Refer to Troubleshooting, “Electrical Connectors - Inspect” in
order to identify intermittent faults.
Result: A “Normally Open” switch is installed. A 107-2 diag-
nostic code is active.
A short circuit condition exists in the air filter restriction switch
circuit.
Proceed to Test Step 3.
Result: A “Normally Closed” switch is installed. A 107-2 diag-
nostic code is active.
An open circuit condition exists in the air filter restriction switch
circuit.
Proceed to Test Step 5.
(continued)
UENR0612 227
Circuit Tests
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