Challenger 35, Challenger 45 and Challenger 55 Agricultural Tractors Electronic Systems Caterpillar

Illustration 1	g00565883
(1) Chassis Control Module (CCM). (2) Transmission Oil Temperature Sensor.

This fault code indicates the transmission oil temperature sensor circuit has a higher than normal voltage and may be due to an open or a short to positive voltage supply. This fault code will only occur after the engine has been running for twenty minutes.

1. Visually inspect transmission oil temperature sensor, Rear Main harness and connectors C002 and C161 for damage or disconnected connectors.

   Expected Result: There is damaged parts or broken parts.

   • YES, repair damage or reconnect connectors as appropriate. Operate the machine for at least twenty minutes. Check active fault code. If fault code is not active, the repair is complete.

   • NO, go to Step 2.

2. Disconnect the Rear Main harness connector C161 from the transmission oil temperature sensor. Check for open circuit across the sensor terminals (open= more than 100k ohms).

   Expected Result: There is an open in the circuit.

   • YES, go to Step 3.

   • NO, go to Step 4.

3. Replace transmission oil temperature sensor with a new sensor and run machine for at least twenty minutes.

   Expected Result: The fault code is active.

   • YES, repair complete.

   • NO, go to Step 4.

4. Check Rear Main harness for open circuit between C161-A and C002-16. Also check between C161-B and C002-8.

   Expected Result: There is an open in the circuit.

   • YES, locate and repair open circuit in Rear Main harness. Operate the machine for at least twenty minutes. Check active fault code. If fault code is not active, the repair is complete.

   • NO, go to Step 5.

5. Check Rear Main harness for short circuit between C002-16 and a positive voltage supply or the battery. Voltage should be 5 volts.

   Expected Result: There is a short in the circuit.

   • YES, locate and repair short circuit in Rear Main harness. Operate the machine for at least twenty minutes. Check active fault code. If fault code is not active, the repair is complete.

   • NO, go to Step 6.

6. Download latest control module software into all control modules.

   Expected Result: The fault code is active.

   • YES, go to Step 7.

   • NO, repair is complete. Calibrate transmission and three-point hitch.

7. Replace the Chassis Control Module (CCM).

   Expected Result: The fault code is active.

   • YES, install the original CCM and repeat this troubleshooting procedure.

   • NO, go to Step 8.

8. Install the original CCM.

   Expected Result: The fault code is active.

   • YES, original CCM was faulty. Replace original CCM with new CCM. If fault code is not active, repair is complete. Download latest control module software into all modules. Calibrate transmission and three-point hitch.

   • NO, this fault code may have been caused by faulty connectors. Keep the original on the tractor. Clean all terminals on the CCM and reconnect. If fault code is not active, repair is complete. Download latest control module software into all modules. Calibrate transmission and three-point hitch.