38.3
TROUBLESHOOTING FLASH CODE 38
38.3.7
Check for Open +5 Volt Line
Perform the following steps to check for open +5 volt line.
1. Turn vehicle ignition OFF.
2. Disconnect the engine harness connectors at the ECM.
3. Install a jumper wire between sockets A and C of the FPS harness connector.
See Figure 38-4.
4. Measure resistance between sockets W1 and Y2 on the engine harness connector.
[a] If resistance measurement is less than or equal to 5
refer to section 38.3.8.
[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 38.3.12.
Figure 38-4
Engine Harness Connector to Fuel Pressure Sensor
38.3.8
Check for Short
Perform the following steps to check for a short.
1. Remove jumper wire.
2. Measure resistance between sockets A and C of the FPS harness connector.
[a] If the resistance measurement is greater than 100
or open, refer to section 38.3.11.
[b] If the resistance measurement is less than or equal to 100 , the return line (#452) is
shorted to the engine +5 volt line (#416). Repair the short and refer to section 38.3.12.
All information subject to change without notice.
38-8
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
