36.3
TROUBLESHOOTING FLASH CODE 36
[b] If either resistance measurement is less than 100 , the signal line (#530) is shorted
to the return line (#452) or battery ground. Repair short and refer to section 36.3.12.
36.3.7
Check ECM Connectors
Perform the following steps to check ECM connectors.
1. Check terminals at the ECM harness connector (both ECM and harness side) for damage:
bent, corroded and unseated pins or sockets. Check W1, P2 and Y2 terminals and pins
at ECM.
[a] If the terminals and connectors are damaged, repair them and refer to section 36.3.12.
[b] If the terminals and connectors are not damaged, reprogram the ECM.
Refer to section 36.3.12.
36.3.8
Check for Open +5 Volt Line
Perform the following steps to check for open +5 volt line.
1. Turn ignition OFF.
2. Disconnect the engine harness connectors at the ECM.
3. Install a jumper wire between pins A and C of the OPS connector.
4. Measure resistance between sockets W1 and Y2 on the engine harness connector.
[a] If the resistance measurement is less than or equal to 5 , refer to section 36.3.9.
[b] If the resistance measurement is greater than 5
or open, the engine +5 volt line
(#416) is open. Repair the open and refer to section 36.3.12.
36.3.9
Check for Short
Perform the following steps to check for a short.
1. Remove jumper wire.
2. Measure resistance between sockets A and C on the OPS harness connector. Also measure
resistance between socket C and a good ground.
[a] If either resistance measurement is less than or equal to 100 , the engine +5 volt
line (#416) is shorted to the return line (#452) or battery ground. Repair the short
and refer to section 36.3.12.
[b] If the resistance measurement is greater than 100
or open, replace OPS and
refer to section 36.3.12.
36.3.10 Check for Short to Battery +
Perform the following steps to check for a short to battery.
1. Remove both fuses to the ECM.
All information subject to change without notice.
36-8
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
