31.3
TROUBLESHOOTING FLASH CODE 31
2. Unplug the engine harness connector.
3. Measure resistance between S3 (#561) and a battery ground, and S3 (#561) and the engine
block. Repeat this check between T3 (#562) and battery ground, and T3 (#562) and
the engine block.
[a] If resistance for all measurements is greater than 5
or open, refer to section 31.3.8.
[b] If any measured resistance is less than 5 , the wire where the measurement
was read is shorted to ground or to the engine. Repair short or replace the wire.
Refer to section 31.3.10.
31.3.8
Check for Short
Perform the following steps to check for a short between wires.
1. Measure resistance between S3 (#561) and T3 (#562).
[a] If measured resistance is less than 10 , the S3 and T3 wires are shorted to each
other. Repair short. Refer to section 31.3.10.
[b] If measured resistance is greater than 10 , refer to section 31.3.9.
31.3.9
Check Brake Solenoids
Perform the following steps to check for brake solenoids.
1. Check brake solenoids. Refer to OEM guidelines.
[a] If the solenoids are in good condition, contact Detroit Diesel Technical Service.
Refer to section 31.3.10.
[b] If the solenoids are damaged, repair or replace them. Refer to section 31.3.10.
31.3.10 Verify Repairs
Perform the following steps to verify repairs.
1. Connect any connectors removed for troubleshooting.
2. Start and run the engine. (Operate the engine brake.)
[a] If no lights come on, and no codes are logged, the repairs are complete. No further
troubleshooting is required.
[b] If Check Engine Light displays with codes s 051 3/4 or 052 3/4, review this section to
find the error. Refer to section 31.3.1.
All information subject to change without notice.
31-8
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION