Troubleshooting

(Table 113, contd)
Troubleshooting Test Steps
Values Results
3. 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.
Repair: Refer to Troubleshooting, “Electrical Connectors - In-
spect” 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 4.
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 6.
4. Create an Open Circuit at the Switch Connector
A. Turn the keyswitch to the OFF position.
B. Disconnect the connector from the air filter restriction
switch.
C. Turn the keyswitch to the ON position. Do not start the
engine.
D. Use the electronic service tool to check for an active 107-2
diagnostic code. Wait at least 10 seconds for activation of the
diagnostic code.
E. Turn the keyswitch to the OFF position.
Diagnostic
codes
Result: The fault is cleared with the switch disconnected.
Repair: Replace the air filter restriction switch.
Use the electronic service tool to clear all logged diagnostic co-
des and verify that the repair eliminates the fault.
Result: The 107-2 diagnostic code is still active with the air fil-
ter restriction switch disconnected.
Reconnect the connector to the air filter restriction switch and
proceed to Test Step 5.
5. Check the Wiring for a Short Circuit
A. Turn the keyswitch to the OFF position.
B. Disconnect the connector for the switch. Disconnect the
P1 connector from the ECM.
C. Use a suitable multimeter to measure the resistance be-
tween P1:87 and all other terminals on the P1 connector.
Greater than 1
k Ohm
Result: At least one of the resistance measurements is less
than 1 k Ohm
The fault is in the wiring between the air filter restriction switch
and the P1 ECM connector.
Repair: Check all wiring between the switch and the ECM. Re-
fer to the Electrical Schematic for the application.
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: All resistance measurements are greater than 1 k
Ohm.
Contact the Dealer Solution Network (DSN).
(continued)
244 UENR0612-07
Circuit Tests
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