10.2
ENGINE CRANKS BUT WILL NOT START
[b] If the terminals and connectors are not damaged, replace the ECM.
Refer to section 10.2.27. (Try a test ECM first.)
10.2.9
Check for Good Synchronous Reference Sensor Signal
Perform the following steps to check for a good SRS signal:
1. Select engine data list on DDR.
2. Crank engine while observing DDR display of SRS received. Battery voltage surges while
cranking with electric starters may blank or reset the DDR.
[a] If the SRS RECEIVED signal is YES, refer to section 10.2.11.
[b] If the SRS RECEIVED signal is NO, refer to section 10.2.10.
10.2.10 Check Synchronous Reference Sensor
Perform the following steps to check the SRS:
1. Turn vehicle ignition OFF.
2. Disconnect engine harness connector at the ECM.
3. Measure resistance between sockets S1 and S2 at the engine harness connector.
[a] If the resistance measurement is greater than 200 , refer to section 41.3.3.
[b] If the resistance measurement is less than 100 , refer to section 41.3.2.
[c] If the resistance measurement is between 100 and 200 , refer to section 10.2.6.
10.2.11 Check for Open
Perform the following steps to check if the injector return wires are open:
1. Turn ignition OFF.
2. Disconnect the 5-way injector harness connector at the ECM.
3. Measure resistance between the injector return pin and all the power driver pins on both
harness connectors.
[a] If the resistance measurement is greater than 5
on any reading, an open exists in one
of the injector power driver or return wires. Repair the open. Refer to section 10.2.27.
[b] If the resistance measurement is less than or equal to 5
on any reading,
refer to section 10.2.12.
10.2.12 Short to Ground
Perform the following steps to check if the injector lines are shorted to the ground:
1. Disconnect the 5-way injector harness connector at the ECM.
All information subject to change without notice.
10-6
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
