DDEC TROUBLESHOOTING
[c] If the resistance measurement is between 100 and 200 , refer to section 41.3.5.
Figure 41-4
Engine Harness Connector to Timing Reference Sensor
41.3.5
Check Timing Reference Sensor / Synchronous Reference Sensor
Gap
Perform the following steps to check the TRS/SRS gap.
1. Bar the engine until the TRS is over a TRS tooth of the pulse wheel.
2. Check the gap between TRS and the tooth of the pulse wheel (0.020 to 0.040 in.). A
depth micrometer can be used.
[a] If the gap setting is correct, refer to section 41.3.6.
[b] If the gap setting is not correct, adjust the TRS/SRS until the gap setting is
correct. If the problem returns, the pulse wheel may be loose or bad or damaged.
Refer to section 41.3.15.
41.3.6
Synchronous Reference Sensor Code Check
Perform the following steps to check for SRS code.
1. Check for SRS code.
[a] If code 21/1 is not logged, refer to section 41.3.7.
[b] If code 21/1 is logged, refer to section 41.3.8.
41.3.7
Check ECM Connectors
Perform the following steps to check the ECM connectors.
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
41-7
