Test Step 1. Inspect Electrical Connectors and Wiring -807640392

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TM 9-2320-312-24-2

Troubleshooting Section

Test Step 1. Inspect Electrical Connectors

and Wiring.

g00675876

Illustration 71

Terminal locations for the ECM

E. Ensure that the ECM is wired to the cooling fan on

A. Thoroughly inspect the ECM vehicle harness

the vehicle and/or the A/C high pressure switch.

connector J1/P1, the A/C high pressure switch

Check for wires that are connected to terminal

connector, the connections to the cooling fan

11 (output 5) and for wires that are connected to

solenoid, and the firewall bulkhead connectors.

terminal 41. Input 11 is the A/C high pressure

Refer to Troubleshooting, "Electrical Connectors

switch of vehicle harness connector P1.

- Inspect" for details.

Refer to Illustration 71 for terminal locations for

B. Perform a 45 N (10 lb) pull test on each of the

the ECM.

wires in the ECM connector that are associated

with the following connections:

Expected Result:

Cooling fan

All connectors, pins, and sockets are completely

A/C high pressure switch

coupled and/or inserted, and the harness and

wiring should be free of corrosion, abrasion or pinch

points.

C. Check the ECM connector (allen head screw) for

the proper torque of 6.0 Nm (55 lb in).

Results:

D. Check the harness and the wiring for abrasion

OK Proceed to Test Step 2.

and pinch points from the battery to the ECM.

Then, check from the ignition key switch to the

Not OK

ECM.

Repair: Repair the wiring or replace the wiring, if

necessary. Repair the connectors or replace the

connectors, if necessary. Ensure that all of the

seals are in the proper place. Ensure that all of

the connectors are connected properly.