10.2
ENGINE CRANKS BUT WILL NOT START
10.2 ENGINE CRANKS BUT WILL NOT START
The following procedures will diagnose engine cranks but will not start.
10.2.1
Check Engine Light
Perform the following steps to check the CEL:
1. Turn ignition on while observing the Check/Stop Engine Light.
[a] If the light comes on and stays on, refer to section 9.1.
[b] If the light comes on for up to five seconds, and then goes off, refer to section 10.2.2.
[c] If the lights are off, refer to section 10.2.14.
10.2.2
Fuel Check
Perform the following steps to check the fuel supply:
1. Disconnect the fuel return line.
2. Check for fuel flow while cranking the engine.
[a] If fuel flow is okay, refer to section 10.2.3.
[b] If fuel supply is not okay, refuel the vehicle. The system may need to be re-primed.
Refer to the appropriate engine service manual.
10.2.3
White Smoke Check
Perform the following steps to check for white smoke:
1. Reconnect fuel return line.
2. Look for white smoke coming out of the exhaust stack while cranking the engine.
[a] If white smoke is present, refer to section 10.2.4.
[b] If white smoke is not present, refer to section 10.2.28.
10.2.4
Check Timing Reference Sensor Status
Perform the following steps to check the TRS status via a r/min readout:
1. Select engine speed and active codes on the DDR.
2. Crank the engine for ten seconds while observing DDR display. A battery voltage surge
while cranking with electric starters may blank or reset the DDR.
[a] If the display reads greater than or equal to 60 r/min, refer to section 10.2.9.
[b] If the display reads less than 60 r/min or constantly reads 60 r/min,
refer to section 10.2.5.
All information subject to change without notice.
10-4
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
