COVER 9J2915 - Caterpillar

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Schematic
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P2 ECM connector (P2-9) Air inlet heater - (P2-12) Air inlet heater +Test Step 1. Inspect Electrical Connectors and Wiring
Thoroughly inspect the J501/P501 air inlet heater relay connector and the J2/P2 ECM connector. Inspect the terminal connections on the air inlet heater relay and the air inlet heater. Refer to Troubleshooting, "Electrical Connectors-Inspect" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the air inlet heater.
Check the allen head screw on each ECM connector and the customer connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
Check the harness and wiring for abrasion and for pinch points from the air inlet heater back to the ECM and from the air inlet heater back to the battery.Expected Result:All connectors, pins and sockets are completely coupled and/or inserted and the harness and wiring are free of corrosion, of abrasion and of pinch points.Results:
OK - Proceed to Test Step 2.
Not OK - Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the seals are properly in place and ensure that the connectors are completely coupled.Verify that the repair eliminates the problem.STOPTest Step 2. Check for Active Diagnostic Codes
Connect the Caterpillar Electronic Technician (ET) to the service tool connector.
Check for active diagnostic codes on Cat ET.Expected Result:A 617-05 or 617-06 diagnostic code is active for the air inlet heater relay.Results:
617-05 (Open) is Active - The ECM detects an open circuit (low current) between the relay and the ECM. Proceed to Test Step 3.
617-06 (Short) is Active - The ECM detects a short circuit (high current) between the relay and the ECM. Proceed to Test Step 4.
No Active Diagnostic Codes - There are no active diagnostic codes for the air inlet heater. Proceed to Test Step 5.Test Step 3. Check for an Open Circuit to the Relay
Disconnect the signal wires (small terminals) from the air inlet heater relay.
Install a test lamp across the wires for the relay.
Start the "Air Inlet Heater Override" on Cat ET and observe the test lamp.Note: Do not leave the "Air Inlet Heater Override" ON. Avoid unnecessary cycling of the air inlet heater in order to prevent the battery from discharging. The "Air Inlet Heater Override" has a one minute timer that disables the test when the time expires.
Stop the "Air Inlet Heater Override" and turn the keyswitch to the OFF position.Expected Result:The test lamp turned on while the override was active.Results:
OK - The open circuit is in the relay.Repair: Replace the relay and clear the diagnostic code.Verify that the repair eliminates the problem.STOP
Not OK - The open circuit is in one of the wires for the relay between the relay and the ECM.Repair: Repair the circuit.Verify that the repair eliminates the problem.STOPTest Step 4. Check for a Short Circuit to the Relay
Disconnect the signal wires (small terminals) from the air inlet heater relay.
Turn the keyswitch to the ON position