HOSE AS 8X5979 - Caterpillar

Table 4
Troubleshooting Test Steps Values Results
1. Check the Type of Switch that is Installed and Configured
A. Connect the electronic service tool to the diagnostic connector.
B. Turn the keyswitch to the ON position. Do not start the engine.
C. Use the electronic service tool to check that the "Air Filter Restriction Switch Installation Status" and the "Air Filter Restriction Switch Configuration" matches the type of switch that is installed.
Switch configuration
Result: An air filter restriction switch is installed and the "Air Filter Restriction Switch Installation Status" is "Not Installed".
Use the electronic service tool to change the "Air Filter Restriction Switch Installation Status" to "Installed". Ensure that the "Air Filter Restriction Switch Configuration" matches the type of switch that is installed.
Use the electronic service to check that the repair eliminates the fault.
Result: An air filter restriction switch is not installed and the "Air Filter Restriction Switch Installation Status" is "Not Installed". The "Air Filter Restriction Switch Configuration" is "Normally Closed".
Repair: Change the "Air Filter Restriction Switch Configuration" to "Normally Open."
Use the electronic service to check that the repair eliminates the fault.
Result: An air filter is installed and the "Air Filter Restriction Switch Installation Status" is installed. The "Air Filter Restriction Switch Configuration" does not match the type of switch that is installed.
Repair: Change the "Air Filter Restriction Switch Configuration" to match the type of switch that is installed.
Use the electronic service to check that the repair eliminates the fault.
Result: An air filter restriction switch is installed. The "Air Filter Restriction Switch Installation Status" is "Installed". The "Air Filter Restriction Switch Configuration" matches the type of switch that is installed.
Proceed to Test Step 2.
2. 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: Repair the damaged wire or the damaged connector.
Use the electronic service tool to clear all logged diagnostic codes. Verify that the repair eliminates the fault.
Result: All connectors, pins, and sockets are correctly connected and/or inserted and the harness is free of corrosion, of abrasion or of pinch points.
Proceed to Test Step 3.
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 "Normally 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