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PLATE 3904328 - Caterpillar



3904328 PLATE Caterpillar parts PLATE
Rating:
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Alternative (cross code) number:
CA3904328
390-4328
3904328
Caterpillar 3904328 PLATE

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Note: A -4 diagnostic code can indicate either an actual short to ground or an open circuit.Expected Result:None of the above diagnostic codes are active.Results:
OK (No active codes) - None of the above codes are active at this time. The problem seems to be resolved. The original diagnostic code was probably caused by a poor electrical connection in one of the harness connectors.Repair: If any of the above codes are logged and the engine is not running properly, refer to Troubleshooting, "Symptom Troubleshooting".If any of the above codes are logged and the engine is running properly, there may be an intermittent problem in a connector or a wiring harness. Refer to Troubleshooting, "Electrical Connectors - Inspect".STOP
Not OK (Active Code) - A -3 or -4 diagnostic code was activated.Repair: Note the diagnostic code and note the location of the suspect detonation sensor. Proceed to Test Step 4.Test Step 4. Verify the Presence of the Supply Voltage at the Sensor
Disconnect the detonation sensor with the diagnostic code.
Illustration 4 g00890518
Harness connector for the detonation sensors (A) 8 volt supply (B) Return (C) Signal
Measure the voltage between terminals A and B on the harness connector for the sensor.Expected Result:The voltage is between 7.6 VDC and 8.4 VDC.Results:
OK - The voltage is between 7.6 VDC and 8.4 VDC. The correct voltage is available to the sensor. Do not reconnect the sensor. Proceed to Test Step 5.
Not OK - The voltage is not between 7.6 VDC and 8.4 VDC. The correct voltage is not available to the sensor. There is probably an open circuit in the 8 volt supply or in the return for the sensor.Repair: The open circuit may be caused by a poor electrical connection or a wiring problem between the ECM and the connector for the sensor.Repair the electrical connection and/or the wiring, when possible. Replace the harness, if necessary.STOPTest Step 5. Measure the Voltage of the Signal Wire at the Sensor
Illustration 5 g00890518
Harness connector for the detonation sensors (A) 8 volt supply (B) Return (C) Signal
Measure the voltage between terminals B and C on the harness connector for the suspect sensor.Expected Result:The voltage is between 0.4 VDC and 0.6 VDC.Results:
Yes - The voltage is between 0.4 VDC and 0.6 VDC.Repair: Reconnect the suspect sensor. Start the engine again and check for the diagnostic code.If the diagnostic code recurs, replace the detonation sensor with a known good detonation sensor. Tighten the detonation sensor according to the torque in Specifications, "Detonation Sensor". Verify that the problem is resolved.STOP
No - The voltage is not between 0.4 VDC and 0.6 VDC. If the voltage is less than 0.4 VDC, there is probably a short to ground or an open circuit between the connector for the detonation sensor and the ECM. If the voltage is greater than 4.8 VDC, there is probably a short circuit to a +Battery source between the connector for the detonation sensor and the ECM. If you


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