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

Illustration 1	g00562575
(1) Chassis Control Module. (2) Three-Point Raise Solenoid. (3) Three-Point Lower Solenoid.

This fault code indicates the current in the lower solenoid circuit is lower than normal at the return input and may be due to an open solenoid, an open circuit or a short to chassis ground.

1. Inspect three-point hitch lower solenoid, Rear Main harness and connectors (C164 and C001) for soiled, corroded or separated connectors or damaged parts.

   Expected Result: There is damage. The connectors are separated.

   • YES, reconnect separated connectors. Repair damaged parts as appropriate and recheck fault codes. If fault code is not active, repair is complete.

   • NO, go to Step 2.

2. Enter Mode 6 at the EMC and select identification number P051 (lower). Disconnect C164 from lower solenoid. Verify function of solenoid by measuring voltage across solenoid connector C164.

   Expected Result: The voltage measures 5 to 8 DCV.

   • YES, go to Step 3.

   • NO, go to Step 7.

3. Disconnect three-point hitch lower solenoid connector C164 and measure resistance across terminals A to B of solenoid.

   Expected Result: The resistance measures approximately 2.4 ohms.

   • YES, go to Step 4.

   • NO, replace three-point hitch lower solenoid and recheck fault codes. If fault code is not active, repair is complete.

4. Check for short circuit to the solenoid case from terminals A or B.

   Expected Result: There is a short circuit.

   • YES, replace three-point hitch lower solenoid and recheck fault codes. If fault code is not active, repair is complete.

   • NO, go to Step 5.

5. Check for open circuit in Rear Main harness from C001-C to C164-A, C001-W to C164-B.

   Expected Result: There is an open circuit.

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 Check fault code and if no longer active the repair is complete.

   • NO, go to Step 6.

6. Check for short circuit in Rear Main harness from C001-C or C164-A to chassis ground. Also, check from C001-W or C164-B to chassis ground.

   Expected Result: There is a short circuit.

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 Check fault code and if no longer active the repair is complete.

   • NO, go to Step 7.

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

   Expected Result: The fault code is active.

   • YES, go to Step 8.

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

8. 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 9.

9. 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.