Case IH 4179 – DU Module or CCM: Rear EHR control no.3 - short circuit

The controller has detected a short circuit (either to ground or to power) in the electrical circuit responsible for operating the Rear Electro-Hydraulic Remote (EHR) valve number 3.

• Maxxum
• Puma 140
• Puma 165
• Puma 180
• Puma 195
• Puma 210
• Puma 225 CVX
• Steiger
• Magnum
• T6
• T7.220
• T7.250
• T7.270
• T8

1. 1

   Inspect the wiring harness running from the DU module to the rear remote valve stack for chafing, melted insulation, or pinch points that could cause a short circuit to the tractor chassis.

2. 2

   Disconnect the electrical plug at Rear EHR valve #3 and check for water ingress, corrosion, or bent pins bridging the connections.

3. 3

   Use a multimeter to measure the resistance across the pins of the EHR valve #3 solenoid coil. A reading of zero or near-zero ohms indicates an internal short in the coil.

4. 4

   Swap the electrical connector from EHR valve #3 to a known good valve (such as EHR valve #2 or #4). If the fault code changes to the corresponding valve, the #3 valve solenoid is internally shorted. If the fault code remains 4179, the short circuit is in the wiring harness or DU module.

1. 1

   Disconnect battery

   If the wiring harness is at fault: Disconnect the tractor's battery.

2. 2

   Repair or replace harness

   Locate the shorted section of the harness, repair the wires using proper splicing and heat-shrink tubing, or replace the affected harness section.

3. 3

   Disconnect battery and relieve pressure

   If the EHR Valve #3 is internally shorted: Disconnect the tractor's battery and relieve all hydraulic system pressure.

4. 4

   Disconnect electrical connector

   Disconnect the electrical connector from the faulty EHR valve #3.

5. 5

   Remove tie-rod bolts

   Remove the tie-rod bolts holding the rear remote manifold stack together.

6. 6

   Remove faulty valve slice

   Carefully slide out the faulty EHR valve slice, ensuring no dirt or debris enters the hydraulic system.

7. 7

   Install new valve slice

   Install the new electro-hydraulic remote valve slice with new O-rings/seals.

8. 8

   Reinstall tie-rods

   Reinstall the tie-rods and torque them to OEM specifications.

9. 9

   Reconnect harness and battery

   Reconnect the electrical harness and the battery.

10. 10

    Calibrate hydraulic valve

    Perform a hydraulic valve calibration using the tractor's AFS Pro monitor or a diagnostic tool. Failing to calibrate the new valve will immediately trigger fault code 4177.