10.2
ENGINE CRANKS BUT WILL NOT START
10.2.22 Check for Ground
Perform the following steps to check if the ignition wire is shorted to ground:
1. Replace blown fuse or reset open circuit breaker.
2. Turn ignition ON for ten seconds.
3. Run engine for one minute.
4. Turn ignition OFF.
5. Check 5-amp ignition fuse or circuit breaker again.
[a] If both the fuse and circuit breaker are okay, refer to section 10.2.23.
[b] If the fuse and circuit breaker are not okay, the ignition line (circuit #439) is shorted
to ground. Repair the short; refer to section 10.2.27.
10.2.23 Check Fuse or Circuit Breaker
Perform the following steps to check if the ignition fuse or breaker is okay:
1. Reconnect all harness connectors at the ECM.
2. Start the engine.
3. Run engine for one minute.
4. Turn ignition OFF.
5. Check 5-amp ignition fuse or circuit breaker again. For 5-way ECM power harness
schematic, see Figure 10-6.
[a] If both the fuse and circuit breaker are okay, no short is currently present. Be warned
of an intermittent short that could shut down the engine or blow a fuse due to reverse
voltage at the battery. Refer to section 10.2.27.
All information subject to change without notice.
10-14
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
