ELECTRICAL SYSTEM TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
FUEL TRANSFER PUMP CIRCUIT TEST
N OT E
· Perform this procedure to check voltage for fuel transfer pump and to check operation of fuel transfer pump.
· ECM controls operation of fuel transfer pump through pump relay and P1:31.
Inspect electrical connectors and wiring. Refer to Electrical Connectors Inspection (WP 0022 00).
Disconnect and inspect J1/P1 ECM connector and J20/P20 MIC (WP 0053 00 and WP 0170 00). Inspect terminal
connections on relay for fuel transfer pump (WP 0054 00).
Perform 10 lb (45 N) pull test on each wire in ECM connector associated with fuel transfer pump.
Check ECM connector (socket-head screw) for proper torque of 55 lb-in. (6 Nm).
Check harness and wiring for abrasion and pinch points from sensors back to ECM.
Reconnect all connectors.
Expected Results. All connectors, pins, and sockets should be completely connected and/or inserted and harness
and wiring should be free of corrosion, abrasions, or pinch points.
If results are OK, wiring and connectors are good. Proceed to step 2.
If results are NOT OK, a problem exists with wiring and connectors. Replace wiring harness in question
(WP 0169 00 thru WP 0175 00). Ensure all seals are properly in place and connectors are securely con-
nected. Verify repair eliminates problem.