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

Illustration 1	g00562632
(1) Right Hand Control Module. (2) Drop Rate Potentiometer. (3) Height Limit Potentiometer. (4) Sensitivity Potentiometer. (5) Three-Point Lever Position Potentiometer.

Illustration 2	g00562655
Location Of Connectors

This fault code indicates the RHC sensor 5 volt supply circuit has a lower than normal voltage and may be due to a short to ground, or open circuit.

1. Inspect all Right Hand Console potentiometers and connectors C011, C137, C138, C139, C140 and C141.

   Note: Connector C140 is not used. But it must be clean and plugged with a blank mating connector.

   Expected Result: All connectors are connected.

   • YES, go to Step 2.

   • NO, reconnect all connectors and recheck fault codes. If fault code is not active, repair is complete.

2. Enter Mode 3 at the EMC and select identification numbers P121, P122, P123, P125. Vary each three-point hitch potentiometer from minimum to maximum.

   Expected Result: The display varies from approximately 6% to 78%.

   • YES, check Mode 12 for proper setup. After all Mode 12 parameters are checked and/or corrected, save all of the values even if no changes are made. To save, press and hold the setup/select key for three seconds. Turn the key start switch OFF and wait for 10 seconds. Operate the machine. Check to see if the fault code reoccurs. If the fault code is still active, go to Step 8.

   • NO, go to Step 3.

3. Disconnect RHC module connector C011. Check for open circuit between C011-C16 and each of the following terminals: C137-A, C138-A, C139-A and C141-1.

   Expected Result: There is an open circuit.

   • YES, locate and repair open circuit in Right Hand Console harness. Check fault code and if no longer active the repair is complete.

   • NO, go to Step 4.

4. Check for short circuit between C011-C16 and C011-D6 (signal ground). Also check for short circuit between C011-C16 and chassis ground.

   Expected Result: There is a short circuit.

   • YES, locate and repair short circuit in Right Hand Console harness. Check fault code and if no longer active the repair is complete.

   • NO, go to Step 5.

5. Connect C011 to RHC module. Leave all potentiometer connectors disconnected. Turn key start switch ON. Measure voltage across terminals A to C or 1 to 2 of C137 through C141.

   Expected Result: The voltage measures 5 DCV.

   • YES, go to Step 6.

   • NO, go to Step 11.

6. Measure the voltage between C140-A and C140-C while re-connecting each potentiometer connector one at a time. The voltage should remain at 5 volts.

   Expected Result: The voltage measures 5 DCV.

   • YES, go to Step 7.

   • NO, go to Step 11.

7. Check fault codes.

   Expected Result: The fault code is no longer active.

   • YES, repair complete. Recheck fault codes.

   • NO, go to Step 11.

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

   Expected Result: The fault code is active.

   • YES, go to Step 9.

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

9. 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 10.

10. 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.

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

    Expected Result: The fault code is active.

    • YES, go to Step 12.

    • NO, repair is complete.

12. Replace Right Hand (RHC) Module.

    Expected Result: The fault code is active.

    • YES, install original RHC repeat troubleshooting procedure.

    • NO, go to Step 13.

13. Install the original RHC.

    Expected Result: The fault code is active.

    • YES, original RHC was faulty. Replace original RHC with new RHC. If fault code is not active, repair is complete. Download latest control module software into all modules.

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