New Holland ENG 341 – Engine Control Module (ECM): All data written during powerdown cycle was lost (checksum error)

The Engine Control Module (ECM) failed to properly save its operating data to its non-volatile memory (EEPROM) during the last engine shutdown sequence, caused by premature power interruption or internal memory failure.

• T8 Series
• T9 Series
• CR9090
• CX8080
• CX8090
• L220
• L225
• C232

1. 1

   Verify if the operator is turning off the master battery disconnect switch immediately after turning off the ignition key (cutting power too early is the most common cause)

2. 2

   Connect an electronic service tool to determine if the code is active or inactive

3. 3

   Inspect the main battery terminals, ECM ground connections, and unswitched power supply lines for corrosion, looseness, or broken wires

4. 4

   Test the ECU Main Power Relay and its associated fuses in the power distribution box to ensure it is not opening too early or suffering from an internal short/open circuit

1. 1

   Clear the Code

   If the fault was caused by an operator turning off the battery isolator too quickly, simply clear the inactive fault code using your electronic service tool. Educate the operator to wait at least 60 seconds after key-off before throwing the battery disconnect switch.

2. 2

   Repair Wiring/Connections

   If the code returns or is active, disconnect the battery and clean all battery posts and ECM ground terminals. Repair any damaged wires on the unswitched battery supply circuit leading to the ECM.

3. 3

   Replace the Main Relay

   If the unswitched power is dropping out due to a faulty relay, replace the ECU Main Power Relay.

4. 4

   Replace/Reflash the ECM

   If the wiring, grounds, and relays are all in good condition but the code remains active, the ECM has suffered a critical internal hardware failure (EEPROM failure). The Engine Control Module will need to be replaced or sent out for remanufacturing/reflashing.