[a] If the fan override is on, and the fan override is requesting fan on, this is normal.
[b] If the fan override is not on, the fan override wire is shorted to ground, repair the short
or re-configure the input if this is an error in programming. Refer to section 10.8.10.
Perform the following steps to check the connectors:
1. Check connectors for damaged, bent, or corroded terminals.
[a] If the pins and terminals are not damaged, the problem may be due to the solenoid,
ECM, or OEM device that operates the fan. Contact the OEM for further information
or instructions. The ECM and wiring between the ECM and device appear to be
operating correctly and in good repair. The ECM is requesting the fan operation
correctly and the checks indicate the ECM and wire between the ECM and OEM
device is okay.
[b] If the pins or terminals are damaged, repair or replace them. Refer to section 10.8.10.
10.8.10 Verify Repairs
Perform the following steps to verify repairs:
1. Connect any removed connectors.
2. Start engine.
3. Operate engine under conditions that brought you to this section.
4. Check fan operation.
[a] If the fan operates correctly, troubleshooting is complete.
[b] If the fan does not operate correctly, review this section from the first step to find
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION