906K, 906M, 907K, 907M, 908K and 908M Compact Wheel Loaders Electrohydraulic System Electronic Control Module (ECM) - Replace Caterpillar

Replacement of the Electronic Control Module (ECM) can be costly. Replacement can also be a time consuming task. Most electronic failures occur in the wiring and connectors. Prior to replacing an ECM, contact the Technical Communicator at your dealership for a possible consultation with AVSpare. This consultation may greatly reduce repair time and expense.

When troubleshooting has indicated that the ECM has failed, temporarily mount a new ECM to the side of the suspect ECM. Test the Machine with the new ECM. If the problem no longer exists, proceed with the following steps.

Replacement of the ECM

Illustration 1	g03406057
Typical "Copy Configuration" in Cat® ET help menu

1. Record and save configuration data plus any customer specified parameters from the failed ECM.

   Refer to the help screen in AVSpare Electronic Technician (Cat® ET), shown in Illustration 1. Follow the instructions listed under "Using Service" - "Using Copy Configuration" - "Using ECM Replacement". These instructions cover how to load and save the configuration data from the ECM to be replaced. When complete, the "Program ECM" button will be enabled. Later, the "Program ECM" button will be used to load the configuration data into the new ECM.

   Refer to Troubleshooting, "Electronic Service Tool Does Not Communicate" if Cat® ET will not communicate.

   1. Obtain the customer passwords and record the customer passwords. Refer to Troubleshooting, "Customer Passwords" if the customer has lost the passwords.

   2. Use Cat® ET to access read customer specified parameters from the ECM.

   3. Record customer parameters on the "Customer Specified Parameters Worksheet".

2. Replace the faulty ECM.

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

   2. Disconnect the machine harness connectors J1 and J2 from the ECM that is to be replaced.

   3. Remove the ECM and ensure that the replacement ECM has the same part number as the ECM that is being replaced.

   4. Connect the machine harness to the new ECM and mount the ECM.

   5. Connect the machine harness connectors J1 and J2 to the new ECM. Ensure that the connectors are fully seated. Ensure that the hold down bolt is tightened securely

   6. Turn the key start switch and the disconnect switch to the "ON" position.

3. Determine whether the ECM has been programmed and if necessary, flash program the ECM

   1. Connect Cat® ET to the service tool connector and establish communication with the ECM that has been replaced.

      Cat® ET will provide access to the new ECM, if the ECM has already been programmed. If the ECM has not been programmed use the "WinFlash " software which is contained in Cat® ET. Refer to the Testing and Adjusting, "Electronic Control Module (ECM) - Flash Program" in this manual.

4. Load/program all system configuration data plus customer parameters.

   1. With Cat® ET, select the "Service" option from the drop-down menu. Then, select the "Configuration" option. A list of items will appear. Select the "Product ID" and enter the serial number.

   2. Process after flashing a (blank) ECM:

      • Program the Product ID. Wait 90 seconds.

      • Key cycle.

      • Program the Hydrostatic Configuration Code. Wait 45 seconds.

      • Program the rest of the configurations in the ECM Replacement file in any order.

      Note: Not adhering to suggested wait times may result in reduced machine performance and wrongly configured software. If the ECM was not configured according to these instructions, the ECM can be reset by programming an invalid Product ID, key cycling and then programming the correct Product ID. An invalid Product ID for the 914K is AY499999. An invalid Product ID for the 910K is CD299999.

   3. Check each item in this list to verify that the setting matches the machine configuration.

5. Perform all applicable system calibrations.

   Calibrate the following:

   • Throttle Pedal

   • Decel/Brake Pedal

   • Hystat Pump Solenoid

   • Hystat Motor Solenoid

   • Implement Valve Solenoids

   • Demand Fan Solenoid (if equipped)

   Note: Calibrate the swashplate angle sensor before performing the ACS valve calibration (Proportional Hydraulic Modulating Valves).

   Note: Machine performance may be affected by any calibration procedures that are not performed.