ROLLER AS 1466064 - Caterpillar

System Operation Description:The sensor is used to calibrate the signal from the Speed/Timing Sensor. The sensor eliminates any mechanical errors.
Illustration 1 g00821502
Test Step 1. Check for Connector Damage.
Turn the engine control to the OFF position.
Thoroughly inspect the connectors J1/P1 and J2/P2 of the Electronic Control Module (ECM). 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 pinch points.Expected Result:The connectors and wiring should be free of the following problems: damage, corrosion, abrasion and incorrect attachment.Results:
OK - The wiring and connectors are okay. Proceed to test step 2.
Not OK - The wiring and/or connectors need repair.Repair: Repair the connectors or wiring and/or replace the connectors and wiring.STOPTest Step 2. Check for a Short Circuit and/or an Open Circuit.
Disconnect J26/P26.
Measure the resistance between P26-1 and P26-2 .Expected Result:The resistance should be between 110 to 200 Ohms.Results:
OK - The resistance is between 110 Ohms to 200 Ohms. Proceed to test step 3.
Not OK - The resistance is not between 110 to 200 Ohms. The sensor is internally shorted or open.Repair: Replace the sensor.STOPTest Step 3. Check for a Short Circuit in the Wiring Harness.
Disconnect ECM connector J1/P1.
Measure the resistance between J26-1 and J26-2.
Measure the resistance between P26-1 and engine ground.
Measure the resistance between P26-2 and engine ground. Expected Result:The resistance should be greater than 20,000 Ohms for each measurement.Results:
OK - The resistance is greater than 20,000 Ohms for each measurement. Proceed to test step 4.
Not OK - The resistance is less than 20,000 Ohms indicating a short circuit.Repair: Repair the connectors or wiring and/or replace the connectors and wiring.STOPTest Step 4. Check the Resistance through the Harness.
Use a suitable piece of wire and connect P26-1 to P26-2.
Measure the resistance between P1-18 and P1-12 at the ECM connector P1.Expected Result:The resistance should be less than 10 Ohms through the wires.Results:
OK - The resistance is less than 10 Ohms through the wires. Proceed to test step 5.
Not OK - The resistance is more than 10 Ohms through the wires. There is an open circuit in the harness or connectors.Repair: Repair the connectors and wiring and/or replace the connectors and wiring.STOPTest Step 5. Check the Signal Voltage at the Sensor Connectors.
Reconnect sensor connector J26/P26.
Remove wire F723-PK from ECM connector P1-18.
Remove wire F724-PU from ECM connector P1-12.
Turn the engine control to the ON position.
Start the engine.
Decelerate the engine to low idle.
Set a multimeter on the 20 VAC position.
Measure the voltage between P1-18 and P1-12.
Turn the engine control to the OFF position.
Replace all wires and replace all connectors.Expected Result:The signal voltage should be greater than 6.0 VAC.Results:
OK - A valid