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GUARD GP- 2389735 - Caterpillar



2389735 GUARD GP- Caterpillar parts GUARD
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81
Alternative (cross code) number:
CA2389735
238-9735
2389735
Caterpillar 2389735 GUARD GP-

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Illustration 1 g02793805
Schematic of the Transmission Speed Sensor
This diagnostic code is recorded when the ECM receives an incorrect output signal from the speed sensor. The signal is below the dropout signal level. The engine must be running. The incorrect signal that is being read by the ECM has the following characteristics: erratic, intermittent and incorrect. One of the following conditions must be present before the diagnostic code will be active:
The signal from the speed sensor to the ECM is incorrect.
The ECM is NOT receiving the correct information about the speed sensor over the data link.System Response:Machine shifting could be inhibited if this diagnostic code is active and the ECM is reading error data from either the TOS sensor or the TCO sensor.Test Step 1. CHECK THE SENSOR RESISTANCE.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness from the speed sensor.
At the connector for the speed sensor, measure the resistance between the two contacts of the connector of the speed sensor. Expected Result:The resistance measurement is between 1000 ohms and 1200 ohms. Results:
OK - The speed sensor has not failed. Proceed to test step 2.
NOT OK - The speed sensor has failed.Repair: Replace the sensor. See Testing and Adjusting, "Speed Sensor (Transmission Output) - Replace".STOPTest Step 2. CHECK THE RETURN CIRCUIT.
The machine harness remains disconnected from the sensor.
The disconnect switch and the key start switch remain in the OFF position.
At the machine harness connector for the sensor, measure the resistance between contact 1 (wire E901-GN(Green)) and frame ground. Expected Result:The resistance should measure 5 ohms or less.Results:
OK - The return circuit is correct. Proceed to test step 3.
NOT OK - The return circuit (wire E901-GN(Green)) in the machine harness has excessive resistance (open).Repair: Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK THE SIGNAL CIRCUIT FOR AN OPEN IN THE MACHINE HARNESS.
Place a jumper between the two contacts of the machine harness connector for the speed sensor.
Disconnect connectors J1 and J2 from the machine harness of the ECM .
Measure the resistance from the sensor signal J2-20 wire (E900-WH(White)) to the return contact J2-14 wire (E901-GN(Green)) of the machine harness. Expected Result:There should be continuity (less than 5.0 ohms resistance). Results:
OK - The signal circuit in the machine harness is correct. Proceed to test step 4.
NOT OK - There is an open in the signal circuit of the machine harness.Repair: Repair the machine harness or replace the machine harness.STOPTest Step 4. CHECK THE SIGNAL FOR A SHORT.
Remove the jumper between the two contacts of the speed sensor of the previous test "CHECK SIGNAL CIRCUIT FOR AN OPEN IN THE MACHINE HARNESS".
Reconnect the machine harness to the speed sensor.
At the J1 and J2 harness connectors, measure the resistance between J2-14 (wire E901-GN(Green)) and all sources of positive voltage and ground. Expected Result:Each resistance should be greater than 5000 ohms. Results:
OK - The machine harness is correct. Proceed to test step 5.
NOT OK - There is a short in the machine harness.Repair:


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