[b] If the resistance is less than or equal to 1,000 , the signal line #525 is shorted to the
return line. Repair the short. Refer to section 11.3.12.
Variable Speed Governor Circuit
Check for Open Signal
Perform the following steps to check for open signal:
1. Install a jumper wire between sockets A and B of the hand throttle sensor harness
connector. See Figure 11-4.
2. Enable VSG. Refer to OEM guidelines.
3. Measure resistance between sockets D1 (#510) and C3 (#952) on the vehicle harness
[a] If the resistance is less than or equal to 5 , refer to section 11.3.9.
[b] If the resistance is greater than 5
or open and the signal line (#510) or return line
(#952) is open, repair the open. Refer to section 11.3.12.
Check ECM Connectors
Perform the following steps to check for signal open:
1. Check terminals at the ECM vehicle harness connector (both the ECM and harness side)
for bent, corroded, and unseated pins or sockets. See Figure 11-5.
[a] If the terminals and connectors are damaged, repair the terminals, connectors, or
both. Refer to section 11.3.12.
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION