DDEC III/IV Single ECM Troubleshooting – Section 57.3 Troubleshooting Flash Code 57

Section 57.3
Troubleshooting Flash Code 57

The following procedure will troubleshoot Flash Code 57.‪

Section 57.3.1
Code Check

Perform the following steps to check for codes.‪

1. Turn vehicle ignition switch ON.
2. Plug in the diagnostic data reader (DDR).
3. Read active codes.
   1. If code 249/12 is logged, refer to "57.3.2 Verify Codes" .
   2. If no codes are logged, refer to "9.1 First Step for Diagnosing a Fault Within the DDEC System" .
   3. If code 254/12 is logged, and no other codes are logged, replace the ECM. Refer to "9.1 First Step for Diagnosing a Fault Within the DDEC System" .

Section 57.3.2
Verify Codes

Perform the following steps to verify codes.‪

1. Clear codes with DDR.
2. Start and run the engine for one minute.
3. Check CEL for codes.
   1. If CEL is on with code 249/12 displayed, refer to "57.3.3 Check for OEM Devices" .
   2. If CEL is not on and no codes are displayed, refer to "57.3.5 Verify Repairs" .

Section 57.3.3
Check for OEM Devices

Perform the following steps to check for OEM devices.‪

1. Turn vehicle ignition OFF.
2. Determine if any OEM equipment utilizes the J1922 data link. See Figure "Communication Harness" .
   1. If no OEM devices are installed, refer to "57.3.4 Disconnect Nodes" . Refer to step 2 .
   2. If OEM devices are installed, refer to "57.3.4 Disconnect Nodes" . Refer to step 1 .
   

   Figure 1. Communication Harness

Section 57.3.4
Disconnect Nodes

Perform the following steps to disconnect nodes.‪

1. Start and run engine with OEM installed devices disconnected.
   1. If the disconnect does not solve the problem, continue the procedure. Refer to step 2 .
   2. If the disconnect solved the problem, Refer to step 4 .
2. Connect vehicle interface module using J 41005.
3. Start and run engine.
4. Observe CEL codes.
   1. If no CEL or codes are displayed, contact OEM for instructions on how to proceed. Refer to "57.3.5 Verify Repairs" . Fault is in node/wiring.
   2. If CEL is on with code 249/12 logged, install a test ECM. Refer to "57.3.5 Verify Repairs" .

Section 57.3.5
Verify Repairs

Perform the following steps to verify repairs.‪

1. Turn vehicle ignition OFF.
2. Reconnect all connectors.
3. Turn ignition ON.
4. Clear codes with DDR.
5. Start and run the engine for one minute.
6. Stop engine.
7. Check DDR for codes.
   1. If no codes are displayed, troubleshooting is complete.
   2. If CEL is on with code 249/12 logged, all system diagnostics are complete. To troubleshoot the error, refer to "57.3.1 Code Check" .