CB-434D, CB-534D, CB-534D Series XW and CB-564D Paving Compactors Power Supply Circuit of Electronic Control Module Caterpillar


Power Supply Circuit of Electronic Control Module
`

System Operation Description:

Power to the ECM can fail due to an open circuit in the wire, or a blown fuse. A fuse is blown out as a result of an overloaded circuit. For example, the +battery connection is shorted to ground.

Test Step 1. CHECK THE ECM FOR POWER AND GROUND.

At the ECM, measure the voltage from contact 1 to contact 2.

Expected Result:

The voltage is system voltage.

Results:

  • OK - The voltage is system voltage. The power supply circuit to the ECM is correct. Stop.

  • NOT OK - The voltage is not system voltage. Proceed to Test Step 2.

Test Step 2. CHECK THE FUSE

Whenever the machine's electronic components fail to function, check the appropriate fuse for the ECM.

  1. Check the fuse for the ECM. The wire to the fuse for the propel control is 135-BU.

Expected Result:

The fuse is correct.

Results:

  • YES - The fuse is correct. Proceed to Test Step 3.

  • NO - The fuse is not correct.

    Repair: Replace the blown fuse or reset the circuit breaker. Observe the machine for a recurrence of the problem. If the problem persists, the reason for the blown fuse must be isolated and corrected.

    Stop.

Test Step 3. CHECK THE POWER WIRE TO THE ECM.

  1. Turn the key start switch and the disconnect switch to the OFF position.

  1. At the fuse, connect the lead from the multimeter to wire 135-BU.

  1. At the ECM, connect the other lead from the multimeter to the following contacts and measure the resistance: 1, 11, 21 and 31.

Expected Result:

The resistance is less than 5 ohms.

Results:

  • OK - The resistance is less than 5 ohms. The wiring circuit is correct. Proceed to Test Step 4.

  • NOT OK - The resistance measurement to one or more of the contacts is greater than 5000 ohms. The wiring has an open circuit.

    Repair: Repair the wiring harness or replace the wiring harness.

    Stop.

Test Step 4. CHECK THE ECM GROUND CONNECTIONS.

  1. The key switch and the disconnect switch remain in the OFF position.

  1. At the ECM, measure the resistance from contact 2 and contact 3 to frame ground.

Expected Result:

The resistance is less than 5 ohms.

Results:

  • OK - The resistance is less than 5 ohms. The ground circuit is correct. The ECM may have failed. This is unlikely. Perform this entire procedure again. If the problem remains, the ECM may need to be replaced. Contact your dealerships for possible consultation with AVSpare. This consultation may greatly reduce repair time. Stop.

  • NOT OK - The resistance is greater than 5000 ohms. The ground circuit has failed.

    Repair: The ground circuit has failed. Repair the wiring harness or replace the wiring harness.

    Stop.

Information System:

14H Motor Grader Machine Systems Piston Pump (Hydraulic and Steering) - Remove
3524B Engine for Caterpillar Built Machines Water Pump - Install
14H and 16H Motor Graders Power Train Power Train
3512 and 3516 EUI Engines for 784B, 785B, 789B and 793B Off-Highway Trucks Service Engine Lamp
CP-563C and CS-563C Vibratory Compactors Engine Air Filter Primary Element - Clean/Replace
R2900 Load Haul Dump Automatic Brake Application System (Low Transmission Oil Pressure) - Test - If Equipped
793B Off-Highway Truck Suspension Cylinder Suspension Cylinder (Rear)
793B Off-Highway Truck Suspension Cylinder Suspension Cylinder (Front)
938G Series II Wheel Loader and IT38G Series II Integrated Toolcarrier Braking System Accumulator Charging Valve (Brake) - Test and Adjust
R2900 Load Haul Dump Lubricant Viscosities
CB-534D, CB-534D XW and CB-564D Vibratory Asphalt Compactors Vibratory System Eccentric Weight
CB-534D, CB-534D XW and CB-564D Vibratory Asphalt Compactors Vibratory System Piston Motor (Vibratory)
3054E Industrial Engine Glow Plugs - Test
R2900 Load Haul Dump Belts - Inspect/Adjust
3054E Industrial Engine Engine Valve Lash - Inspect/Adjust
CS-563E, CP-563E, CS-573E, CP-573E, CS-583E, CP-583E, CS-663E, CP-663E and CS-683E Vibratory Soil Compactors Engine Oil Level - Check
CS-563E, CP-563E, CS-573E, CP-573E, CS-583E, CP-583E, CS-663E, CP-663E and CS-683E Vibratory Soil Compactors Engine Oil Sample - Obtain
3512 and 3516 EUI Engines for 784B, 785B, 789B and 793B Off-Highway Trucks Engine Overspeed Lamp and Engine Overspeed Alarm
CS-563E, CP-563E, CS-573E, CP-573E, CS-583E, CP-583E, CS-663E, CP-663E and CS-683E Vibratory Soil Compactors Engine Oil and Filter - Change
AP-1000D, AP-1055D, AP-655C, BG-2255C, BG-2455D and BG-260D Asphalt Pavers MID 039 - CID 1763 - FMI 02
M318C Excavator Machine Systems Hydraulic Hand Control - Remove - Stabilizer and Blade
M318C and M322C Excavators Machine Systems Hydraulic Hand Control - Install - Stabilizer and Blade
14H Motor Grader Machine Systems Metering Pump (Steering) - Remove and Install
938G Series II Wheel Loader and IT38G Series II Integrated Toolcarrier Hydraulic System Main Control Valve - IT38G Series II Integrated Toolcarrier