ENGINE AR-PRIMARY 4561374 - Caterpillar

4561374 ENGINE AR-PRIMARY Caterpillar parts

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Alternative (cross code) number:
CA4561374
456-1374
4561374

Weight: 961 pounds 435 kg.

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Illustration 3 g01055967
ECM connector P2
Turn the keyswitch to the OFF position.
Thoroughly inspect the J2/P2 ECM connector. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Perform a 45 N (10 lb) pull test on the following wires in the P2 ECM connector that are associated with the suspect engine speed/timing sensors.Refer to Illustration 3.
Ensure that the latch tab on the connector is properly latched and ensure that the latch tab is fully latched.
Check the ECM connector (allen head screw) for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Repair the harness or repair the connector if a problem is found.
Ensure that the wiring harness is correctly routed and secured at the proper locations.
Ensure that the harness wiring is not pulled too tightly. When the harness wiring is pulled too tightly, vibrations or movement can cause intermittent connections.
Inspect the harness wiring for nicks and for abrasions.
If the harness and the connector are okay, disconnect ECM connector J2/P2.
Use the following procedure to measure the circuit resistance for the primary engine speed/timing sensor:Refer to Illustration 3.
Measure the resistance between P2-48 (primary engine speed/timing +) and P2-49 (primary engine speed/timing −).Note: Check for an intermittent problem (open or short) by moving the harness while you measure the resistance. Pull the wires that are directly behind the sensors and shake the wires that are directly behind the sensors.Resistance ... 75 to 230 Ohms
Use the following procedure to measure the circuit resistance for the secondary engine speed/timing sensor:Refer to Illustration 3.
Measure the resistance between P2:58 (secondary engine speed/timing +) and P2:59 (secondary engine speed/timing −).Note: Check for an intermittent problem (open or short) by moving the harness while you measure the resistance. Pull the wires that are directly behind the sensors and shake the wires that are directly behind the sensors.Resistance ... 600 to 1800 OhmsExpected Result:The readings agree with the values that are listed above.Results:
OK - Neither a short circuit nor an open circuit is indicated. Proceed