RECEPTACLE AS-CONNECTOR 2434510 - Caterpillar

Illustration 1 g01377703
Schematic of the right front drive motor speed sensorThis diagnostic code is recorded when the all wheel drive ECM detects a number one right motor speed sensor signal that has an abnormal frequency. The FMI 02 diagnostic code is activated when the ECM detects an abnormal output frequency of the sensor.The following conditions could cause this diagnostic code to be activated:
The power wire (T800-OR) for the sensor is open.
The return wire (J767-GY) for the sensor is open.
The return wire (J767-GY) for the sensor is shorted to the + battery circuit.
The signal wire (J718-OR) is open.
The signal wire (J718-OR) is shorted to the + battery circuit.
The signal wire (J718-OR) is shorted to ground.
The sensor is faulty.
The ECM is faulty. This is unlikely.Test Step 1. CHECK THE RETURN CIRCUIT
Turn the key start switch to the OFF position.
Disconnect the machine harness from the sensor.
At the machine harness connector for the sensor, measure the resistance from contact 2 (wire J767-GY) of the machine harness to frame ground.Expected Result:The resistance is 5 ohms or less.Results:
OK - The resistance is 5 ohms or less. The return circuit is correct. Proceed to Test Step 2.
NOT OK - The resistance is greater than 5000 ohms. The return circuit is open.Repair: Repair the machine harness or replace the machine harness.STOPTest Step 2. CHECK THE VOLTAGE AT THE SENSOR
The machine harness connector remains disconnected from the sensor.
Turn the key start switch to the ON position.
At the machine harness connector for the sensor, measure the voltage between contact 1 (wire T800-OR) and contact 2 (wire J767-GY).Expected Result:The voltage measures approximately 8 DCV.Results:
OK - The voltage measures approximately 8 DCV. Proceed to Test Step 3.
NOT OK - The voltage does not measure approximately 8 DCV.Repair: Wire T800-OR is open. Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK THE SIGNAL CIRCUIT FOR AN OPEN
Turn the key start switch to the OFF position.
The machine harness connector remains disconnected from the sensor.
Remove the machine harness connectors from the all wheel drive ECM.
At the machine harness connector for the sensor, place a jumper from contact 2 (wire J767-GY) to contact 3 (wire J718-OR).
At the machine harness connector for the ECM, measure the resistance from contact J1-3 and contact J1-45.Expected Result:The resistance is 5 ohms or less.Results:
OK - The resistance is 5 ohms or less. The signal circuit is correct. Proceed to Test Step 4.
NOT OK - The resistance is greater than 5000 ohms. The signal circuit is open.Repair: Repair the machine harness or replace the machine harness.STOPTest Step 4. CHECK THE SIGNAL CIRCUIT FOR A SHORT
The machine harness connector remains disconnected from the sensor and the ECM.
The key start switch remains in the OFF position.
Remove the jumper at the machine harness connector for the sensor.
At the machine harness connector for the ECM, measure the resistance between J1-3 (wire J718-OR) to all contacts that are used in the machine harness.Expected Result:Each resistance measurement is greater than 5000 ohms.Results:
OK - Each resistance measurement is greater than 5000 ohms. Proceed to Test