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

Illustration 1	g00566100
(1) Chassis Control Module (CCM). (2) Transmission F/R Solenoid Fuse (MDP-F20). (3) Transmission Filter Pressure Switch.

This fault code indicates the transmission filter pressure switch has opened while the transmission operating temperature is normal. An open switch will also trigger a non-critical alarm which indicates that oil is bypassing the transmission filter.

Note: The same non-critical alarm can also be triggered when oil is bypassing the steering/implement filter.

If F395, F394, F392 and F388 occur at the same time, then the fuse MDP-F20 may be blown. Read the procedures for each of these fault codes before attempting repair.

F317, connector C003 is open, this can also affect these fault codes. If the filter change interval is approximately 1000 hours or one year go to Step 4.

1. Turn machine OFF. Visually inspect Rear Main harness from connector C003 to Cab Main harness to C181 (Transmission Filter switch) to connector C002-J2 for damage and breaks. Disconnect connector C181. Inspect for poor connections, broken wires or loose terminals. Inspect C003 and C002-J2 for loose, disconnected, or being separated.

   Expected Result: There is damaged parts or broken parts.

   • YES, repair any damage or poor connections. Operate the machine and check active fault code. If fault code is not active, the repair is complete.

   • NO, go to Step 2.

2. Disconnect Rear Main harness connector C181 from the pressure switch. Check the pressure switch by measuring the resistance across the connector terminals 1 and 2 of the switch.

   Expected Result: The switch is open.

   • YES, replace the faulty (open) filter pressure switch. Operate the machine and check active fault code. If fault code is not active, the repair is complete.

   • NO, go to Step 3.

3. Check for an open circuit from C181-1 to MDP-F20 by measuring voltage (12V to ground) with Key Start switch ON or continuity from MDP-F20 to C181-1.

   Expected Result: There is an open in the circuit.

   • YES, locate and repair open circuit in Rear Main harness or Cab Main harness. If no voltage, check C003-K and fuse MDP-F20 for open and repair. Operate the machine and check active fault code. If fault code is not active, the repair is complete.

   • NO, go to Step 4 or if repeat of troubleshooting go to Step 5.

4. Replace the transmission filter. Refer to the Operation And Maintenance manual. After the filter has been replaced, run the machine. Check fault codes.

   Expected Result: The fault code is not active.

   • YES, repair is complete.

   • NO, go to Step 1, if Step 1 has not already been done or go to Step 5.

5. Remove fuse MDP-F20 and disconnect connector C002. Check for short circuit in Rear Main harness between C002-18 and chassis ground.

   Expected Result: There is a short in the circuit.

   • YES, locate and repair open circuit in Rear Main harness. Operate the machine and 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.