54.3
TROUBLESHOOTING FLASH CODE 54
[c] If the resistance measurement is between 50 and 3,000 , refer to section 54.3.7.
Figure 54-1
ECM Vehicle Harness Connector
54.3.4
Check for Short
Perform the following steps to check for short.
1. Disconnect VSS connector.
2. Measure resistance between vehicle harness connector terminals E2 and E3.
See Figure 54-1.
[a] If the resistance measurement is less than or equal to 1,000 , the signal wire #556 or
return wire #557, are shorted together. Repair the short; refer to section 54.3.13.
[b] If the resistance measurement is greater than 1,000
or open, refer to section 54.3.5.
54.3.5
Check Vehicle Speed Sensor
Perform the following steps to check the vehicle speed sensor.
1. Measure resistance of VSS across vehicle speed sensor connector pins. See Figure 54-1.
[a] If the resistance measurement is less than 50 , refer to section 54.3.8.
[b] If the resistance measurement is greater than 3,000
or open, refer to section 54.3.8.
[c] If the resistance measurement is between 50 and 3,000 , refer to section 54.3.10.
All information subject to change without notice.
54-6
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
