TEST OR INSPECTION
Remove rings, wristwatches, neck chains, and any other jewelry before working
around vehicle. Jewelry can catch on equipment and cause serious injury. Jewelry
and tools may short across electrical circuits and cause damage to equipment, or
severe burns or electrical shock to personnel.
Turn battery disconnect switch to OFF position (WP 0007). Remove driver side crew
cab access panel (WP 0499). Remove pump house panel Q (WP 0540). Disconnect
main wire harness valve control wire harness connector DV1. Turn battery disconnect
switch to ON position (WP 0007). With a test lead set, check for 22 to 28 VDC between
main wire harness wire 4053 (brown) at main wire harness valve control wire harness
connector DV1, terminal 6 and a known good ground.
If 22 to 28 VDC are present, repair wire 4053 in valve control wire harness if
repairable (TM 9-2320-325-14&P), or replace valve control wire
harness (WP 0463).