57.3
TROUBLESHOOTING FLASH CODE 57
[b] If OEM devices are installed, refer to section 57.3.4. Refer to step 1
Figure 57-2
Communication Harness
57.3.4
Disconnect Nodes
Perform the following steps to disconnect nodes.
1. Start and run engine with OEM installed devices disconnected.
[a] If the disconnect does not solve the problem, continue the procedure. Refer to step 2
[b] If the disconnect solved the problem, Refer to step 44[a].
2. Connect vehicle interface module using J 41005.
3. Start and run engine.
4. Observe CEL codes.
[a] If no CEL or codes are displayed, contact OEM for instructions on how to proceed.
Refer to section 57.3.5. Fault is in node/wiring.
[b] If CEL is on with code 249/12 logged, install a test ECM. Refer to section 57.3.5.
57.3.5
Verify Repairs
Perform the following steps to verify repairs.
1. Turn vehicle ignition OFF.
2. Reconnect all connectors.
All information subject to change without notice.
57-6
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
