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.
Wires contained in water pump engine wire harness are black and have no
identifying numbers. It will be necessary to use connector terminal numbers
described in text and pictures to identify correct wire. Failure to comply may cause
damage to equipment.
Do not force test probes into water pump engine wire harness connectors. Failure
to comply will cause damage to equipment.
Stop water pump engine (WP 0022). Turn battery disconnect switch to OFF position
(WP 0007). Remove driver and passenger side crew cab access panel (WP 0499).
Remove pump house panel O and Q (WP 0540). Disconnect water pump engine wire
harness oil pressure sensor connector. Disconnect water pump engine wire harness
ECU connector. With a test lead set, check for continuity across wire from water pump
engine wire harness oil pressure sensor connector, terminal 1 to water pump engine
wire harness ECU connector, terminal 22.