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 lower than normal voltage and may be due to a short, or a short to ground.

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

   Expected Result: There is damaged parts or broken parts.

   • YES, repair damage as appropriate. Operate the machine at least twenty minutes and check active fault code. If fault is not active, the repair is complete.

   • NO, go to Step 2.

2. Disconnect connector C161 and measure resistance across sensor terminals C161-A and C161-B. Resistance should be high approximately 2300 to 2650 ohms at room temperature. The resistance goes lower at higher oil temperatures. If resistance is low replace transmission oil temperature sensor with a new sensor and run machine for at least twenty minutes. If sensor was not replaced, go to Step 3. Check fault code.

   Expected Result: The fault code is not active.

   • YES, repair complete.

   • NO, go to Step 3.

3. Disconnect connector C161. Check Rear Main harness for short circuit between C161-A and C161-B.

   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 4.

4. Check Rear Main harness for short circuit between C002-16 and chassis ground.

   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 5.

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

   Expected Result: The fault code is active.

   • YES, go to Step 6.

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

6. 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 7.

7. 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.