TOOL 6V3021 - Caterpillar

Illustration 1 g00908900
Typical exampleTest Step 1. Check for Connector Damage.
Turn the keyswitch to the OFF position.
Turn the breaker for the engine ECM to the OFF position.
Thoroughly inspect the ECM connectors J1/P1 and J2/P2. Inspect all of the other connectors. Refer to the diagnostic functional test Troubleshooting, "Inspecting Electrical Connectors" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the circuit.
Check the ECM connector (allen head screw) for the proper torque of 6.0 N m (55 lb in).
Check the customer connector (allen head screw) for the proper torque of 2.25 0.25 N m (20 2 lb in).
Check the harness and the wiring for abrasion and for pinch points.Expected Result:The connectors and wiring should be free of the following problems: damage, corrosion, abrasion and incorrect attachment.Results:
OK - The connectors and wiring are okay. Proceed to test step 2.
Not OK - The connectors and/or wiring are not okay.Repair: Repair the connectors and/or wiring or replace the connectors and/or wiring. Stop.Test Step 2. Check the Harness for Shorts.
Disconnect ECM connector J1/P1. Disconnect all of the analog sensors.
Measure the resistance between the analog supply P1-36 and the analog return P1-30.
Measure the resistance between the analog supply P1-36 and the engine ground.
Measure the resistance between the analog return P1-30 and the engine ground.Expected Result:The resistance should be more than 20,000 Ohms for each measurement.Results:
OK - The resistance is greater than 20,000 Ohms. Proceed to test step 3.
Not OK - The resistance is less than 20,000 Ohms.Repair: Repair the connectors and/or wiring or replace the connectors and/or wiring. Stop.Test Step 3. Check the Analog Sensor Supply Voltage at the ECM.
Remove wire P1-36 from the ECM connector P1. Install a jumper wire into the socket for P1-36.
Remove wire P1-30 from the ECM connector P1. Install a jumper wire into the socket for P1-30.
Reconnect ECM connector J1/P1.
Turn the breaker for the engine ECM to the ON position.
Turn the keyswitch to the ON position. The engine should be off.
Measure the voltage between the analog supply P1-36 and the analog return P1-30.
Turn the keyswitch to the OFF position.
Turn the breaker for the engine ECM to the OFF position.
Remove the jumper wires and replace all wires. Reconnect J1/P1.Expected Result:The supply voltage should be 5.0 0.2 VDC.Results:
OK - The supply voltage is 5.0 0.2 VDC. The analog sensor supply is producing the correct voltage. Proceed to test step 4.
Not OK - The supply voltage is not 5.0 0.2 VDC. The analog sensor supply is not producing the correct voltage.Repair: Perform the diagnostic functional test Troubleshooting, "Electrical Power Supply". Stop.Test Step 4. Check the Analog Sensor Supply Voltage at the Sensor Connector.
Turn the breaker for the engine ECM to the ON position.
Turn the keyswitch to the ON position. The engine should be off.
Measure the voltage between socket A and socket B on the harness side of all analog sensor connectors. Ensure that you are measuring on the harness side of the connector since the sensors