TROUBLESHOOTING FLASH CODE 23
3. Disconnect the engine harness connector at the ECM.
4. Measure resistance between sockets R3 and W1 on the engine harness connector.
See Figure 23-3.
[a] If the measured resistance is greater than 100 or open, refer to section 23.3.3.
[b] If the measured resistance is less than or equal to 100 , the signal line #472 is
shorted to the engine +5 volt line #416. Repair the short; refer to section 23.3.6.
ECM Engine Harness Connector
Check Fuel Temperature Sensor Connectors
Perform the following steps to check the FTS connectors:
1. Check terminals at the FTS harness connector (both sensor and harness side) for bent,
corroded, and unseated pins or sockets. See Figure 23-4.
[a] If terminals and connectors are damaged, repair them. Refer to section 23.3.6.
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION