DDEC TROUBLESHOOTING
42.3 TROUBLESHOOTING FLASH CODE 42
The following procedure will troubleshoot Flash Code 42.
42.3.1
Resistance Check
Perform the following steps to check resistance.
1. Turn vehicle ignition OFF.
2. Disconnect engine harness connector at ECM.
3. Measure resistance between sockets S1 and S2 on the engine harness connector.
See Figure 42-2.
[a] If the resistance measurement is less than or equal to 200 , refer to section 42.3.2.
[b] If the resistance measurement is greater than 200
or open, refer to section 42.3.3.
Figure 42-2
ECM Engine Harness Connector
42.3.2
Check for Short
Perform the following steps to check for a short.
1. Disconnect the SRS Connector.
2. Measure resistance between sockets S1 and S2 on the engine harness connector.
See Figure 42-3.
3. Measure resistance between socket S1 and ground, and between socket S2 and ground.
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
42-5
