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

Illustration 1	g00566175
(1) Chassis Control Module (CCM). (2) Transmission F/R Solenoid Fuse (MDP-F20). (3) Steering/Implement Filter Pressure Switch.

This fault code indicates the steering/implement filter pressure switch has opened while the operating temperature is normal. An open switch will also trigger a critical alarm with shutdown which indicates that oil is bypassing the steering/implement filter.

Note: The same but non-critical alarm can also be triggered when oil is bypassing either the transmission 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.

1. Turn machine OFF. Visually inspect Rear Main harness from connector C003 to the Cab Main harness to connector C180 to connector C002-J2 for damage and breaks. Disconnect connectors C180 from the filter switch. 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. Turn machine OFF. Disconnect Rear Main harness connector C180. Check the pressure switch by measuring resistance across the connector terminals 1 and 2.

   Expected Result: The switch is open.

   • YES, replace the steering/implement 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. Turn machine OFF, then turn the Key Start switch to the ON position. Check for an open circuit from C180-1 to MDP-F20 by measuring voltage (12V to ground) or with the fuse pulled for an open circuit from C180-1 to C003-K and to the load side of fuse MDP-F20. Turn Key Start switch OFF and check for open circuit from C180-2 to C002-13.

   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 fuse MDP-F20 for open and replace. 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 filter was changed, go to Step 5.

4. Replace the steering/implement 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 complete.

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

5. Remove fuse MDP-F20. Check for short circuit in Rear Main harness between C002-13 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 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.