D250E Series II, D300E Series II, D350E Series II and D400E Series II Articulated Trucks Power Train Electronic Control System Caterpillar

Illustration 1	g00603951
Schematic Of The Sensor For The Transmission Gear

This diagnostic code is recorded when the ECM reads erratic data from the position sensor.

The possible causes of this diagnostic code are listed:

• A shorted harness or an open harness

• The transmission gear sensor is faulty.

• The ECM is faulty.

Note: Ensure that the CID 0700 FMI 02 for the sensor is active.

As a result of this diagnostic code, the transmission will not shift properly.

1. CHECK THE BATTERY VOLTAGE.

   1. Turn the disconnect switch and the key start switch to the ON position.

   2. At the connector for the sensor, measure the voltage from contact 4 to frame ground.

      Expected Result: The voltage should be approximately battery voltage.

      Result:

      • OK - The voltage does measure approximately battery voltage. Proceed to 2.

      • NOT OK - The voltage does not measure approximately battery voltage. Repair the harness or replace the harness. Verify that the repair corrects the problem. STOP.

2. CHECK THE GROUND CIRCUIT.

   1. The key start switch and the disconnect switch remain in the OFF position.

   2. At the connector for the sensor, measure the resistance from contact 10 to frame ground.

      Expected Results: The resistance should be less than 5 ohms.

      Results:

      • OK - The resistance does measure less than 5 ohms. Proceed to 3.

      • NOT OK - The resistance is greater than 5 ohms. There is an open in the ground circuit. Repair the harness or replace the harness. Verify that the repair corrects the problem. STOP.

3. CHECK THE HARNESS.

   1. Turn the key start switch and the disconnect switch to the OFF position.

   2. Disconnect the sensor from the machine harness.

   3. Turn the disconnect switch and the key start switch to the ON position.

   4. Place the monitor in Sub-mode 6.3 "Inputs Of The Transmission Gear Sensor".
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   Illustration 2	g00535843
   Display Area Of Contacts J1-35, J1-33, J1-32, J1-31, J1-30 And J1-29

   5. At the sensor, use a jumper wire to briefly connect the following contacts of the sensor to frame ground. As each contact is briefly connected to frame ground, the corresponding digit should display a "0" when ground is applied to the contact. Observe the status on the display of the monitor. See the following table.
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      Table 1

      Digit On The Display	Contact
      First Digit	J1-35
      Second Digit	J1-33
      Third Digit	J1-32
      Fourth Digit	J1-31
      Fifth Digit	J1-30
      Sixth Digit	J1-29

      Expected Result: The display shows the correct indication for each contact.

      Results:

      • OK - The display shows the correct indication for each contact. The harness circuit is correct. The sensor has failed. Replace the sensor. Verify that the sensor corrects the problem. Proceed to 4.

      • NOT OK - The display does NOT show the correct indication for each contact. The problem is in the circuit that did not display a correct indication. Repair the circuit or replace the harness. Proceed to 4.

4. CHECK IF THE DIAGNOSTIC CODE REMAINS.

   1. Inspect the contacts and clean the contacts of the harness.

   2. Reconnect all harness connectors.

   3. Turn the disconnect switch and the key start switch to the ON position.

   4. Operate the machine.

   5. Stop the machine and engage the parking brake.

   6. Observe the status of the diagnostic code.

      Expected Results: The diagnostic code is no longer active. The diagnostic code is no longer present. The "SERV CODE" is not showing.

      Results:

      • OK - The diagnostic code is no longer present. The diagnostic code does not exist at this time. The initial diagnostic code was probably caused by a poor electrical connection or a short at one of the harness connectors that was disconnected and reconnected. Resume normal machine operation. STOP.

      • NOT OK - The diagnostic code has not been corrected. It is unlikely that the ECM is faulty. Exit this procedure and perform this diagnostic code again. If the cause of the diagnostic code is not found, replace the ECM. See Testing And Adjusting, "Electronic Control Module (ECM) - Replace".