DISTRIBUTION AR 3797136 - Caterpillar

Illustration 3 g01408183
ECM (3) J1/P1 connectors (4) J2/P2 connectors
Thoroughly inspect the J1/P1 and thoroughly inspect the J2/P2 ECM connectors. Thoroughly inspect any connectors that are associated with the circuit for the IAPCV. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Illustration 4 g01891577
P2 ECM connector (P2-29) IAPCV supply (P2-35) IAPCV return
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the ether injection system.
Check the allen head screw on each ECM connector for the proper torque. Also check the allen head screw on the customer connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
Check the harness and the wiring for abrasion and for pinch points from the ether injection solenoid to the ECM. Verify that all connections and grounds are tight and free of corrosion.Expected Result:All connectors, pins, and sockets are completely inserted and coupled. The harness and wiring are free of corrosion, of abrasions, and of pinch points. All connections and grounds are tight and free of corrosion.Results:
OK - The connectors and wiring appear to be OK. Proceed to Test Step 3.
Not OK - The connectors and/or wiring are not OK.Repair: Repair the circuit.Verify that the repair eliminates the problem.STOPTest Step 3. Check the Solenoid for an Internal Open or Short
Disconnect the IAPCV connector.
Measure the resistance between terminal 1 (IAPCV supply) and terminal 2 (IAPCV return) on the solenoid.Expected Result:The resistance is between 5 Ohms and 15 Ohms.Results:
OK - The resistance is between 5 Ohms and 15 Ohms. Proceed to Test Step 4.
Not OK - The resistance is not between 5 Ohms and 15 Ohms. The IAPCV is faulty.Repair: Replace the IAPCV.Verify that the repair eliminates the problem.STOPTest Step 4. Check for Shorts in the Harness
Disconnect the J2/P2 ECM connector.
Disconnect the IAPCV connector.
Measure the resistance between P2-29 (IAPCV supply) and engine ground. Also, measure the resistance between P2-29 (IAPCV supply) and all the other pins on the J2/P2 ECM connector.
Measure the resistance between P2-35 (IAPCV return) and engine ground. Also, measure the resistance between P2-35 (IAPCV return) and all the other pins on the J2/P2 ECM connector.Expected Result:All of the resistance measurements indicate an open circuit.Results:
OK - All of the resistance measurements indicate an open circuit. Proceed to Test Step 5.
Not OK - A resistance measurement does not indicate an open circuit. There is a short in the wiring between the ECM and the IAPCV.Repair: Repair the circuit.Verify that the repair eliminates the problem.STOPTest Step 5. Check for Open Circuits in the Harness
Disconnect the J2/P2 connectors.
Disconnect the IAPCV connector.
Create a short circuit between terminal 1 and terminal 2 at the IAPCV connector.
Measure the resistance between terminal locations P2-29 and P2-35 at the ECM connector.
Return all connectors to the original configuration.Expected Result:The resistance does not indicate an open circuit.Results:
OK - The resistance does not indicate an open circuit. Proceed to Test Step 6.
Not OK - The resistance indicates an open circuit. There is an open circuit in the wiring harness between