DDEC TROUBLESHOOTING
[a] If the resistance measurement is greater than 200 , refer to section 42.3.10.
[b] If the resistance measurement is less than or equal to 200 , refer to section 42.3.9.
Figure 42-6
Engine Harness Connector to Timing Reference Sensor
42.3.9
Check for Short
Perform the following steps to check for a short.
1. Disconnect the TRS connector.
2. Measure resistance between sockets T1 and T2 on the engine harness connector.
[a] If measured resistance is greater than 10,000 , or open, refer to section 42.3.11.
[b] If measured resistance is less than or equal to 10,000 , the signal line (#110) is
shorted to the return line (#109). Repair the short. Refer to section 42.3.16.
42.3.10 Open Timing Reference Sensor Line Check
Perform the following steps to check for an open TRS line.
1. Disconnect the TRS connector.
2. Install a jumper wire between sockets A and B of the TRS harness connector.
See Figure 42-7.
3. Measure resistance between sockets T1 and T2 on the engine harness connector.
[a] If the resistance measurement is less than or equal to 5 , refer to section 42.3.11.
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
42-9
