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PAN A.-OIL 7B0255 - Caterpillar



7B0255 PAN A.-OIL Caterpillar parts PAN
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86
Alternative (cross code) number:
CA7B0255
7B-0255
7B0255
Caterpillar 7B0255 PAN A.-OIL

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Illustration 1 g01209567This diagnostic code is recorded when the ECM compares certain machine conditions and the data received from the brake cooling motor speed sensor. The ECM will issue this diagnostic code if the sensor data is not within certain parameters.Possible sensor conditions that can cause this diagnostic code are listed:
The signal circuit is shorted to ground.
The speed sensor is not installed correctly.
The speed sensor has failed.
The ECM has failed. This is unlikely.Note: Before performing the following Test Steps, check to see that the speed sensor is mounted securely. If the speed sensor mount is secure and the CID 1229 FMI 02 code is active, proceed to Test Step 1.Test Step 1. CHECK THE RESISTANCE OF THE CASE OF THE SENSOR .
Turn the key start switch and the disconnect switch (if equipped) to the OFF position.
Disconnect the sensor from the machine harness.
At the sensor connector, measure the resistance between contact A and the case of the sensor and between contact B and the case of the sensor. Expected Result:The resistance for each measurement is greater than 10,000 ohms. Results:
OK - The resistance for each measurement is greater than 10,000 ohms. The sensor is not internally shorted. Proceed to Test Step 2.
NOT OK - The resistance is NOT greater than 10,000 ohms. The speed sensor is shorted internally.Repair: Replace the sensor.STOPTest Step 2. CHECK FOR AN OPEN WIRE IN THE MACHINE HARNESS.
The key start switch and the disconnect switch (if equipped) remain in the OFF position.
Disconnect the machine harness ECM connector J2 from the ECM.
At the disconnected machine wiring harness connector for the sensor, connect a jumper between contact A and contact B.
At the machine harness ECM connector, measure the resistance from contact J2-30 (wire J819-BR(Brown)) to J2-36 (wire J818-OR(Orange)). Expected Result:The resistance is less than 5 ohms.Results:
OK - The resistance measurement is less than 5 ohms. The circuit is correct. Proceed to Test Step 3.
NOT OK - The resistance measurement is more than 5 ohms. The circuit is open in the machine harness or there is a faulty connection in the machine harness. Repair: Consult the complete electrical system schematic for this machine. Check all harness connectors that are in the speed sensor circuit. Ensure that the contacts of the connectors are clean, connected and secure. After checking the connectors, repeat this Test Step. If the problem remains, check the circuit wiring for a broken wire. Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK FOR A SHORT IN THE SIGNAL CIRCUIT OF THE MACHINE HARNESS.Note: The machine harness connector remains disconnected from the sensor and the ECM. Remove the jumper that was installed in the last step.
The key start switch and the disconnect switch (if equipped) remain in the OFF position.
At the machine harness connector for the ECM, measure the resistance between contacts J2-36 (wire J818-OR(Orange)) to frame ground or to a ground contact on connectors J1 or J2. The ground contact on connector J2 is J2-3. The ground contacts on connector J1 are J1-2,


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