Illustration 52 Terminal locations for ECM connector P1 (4-pin sensor)

190

TM 9-2320-312-24-2

Troubleshooting Section

g00845671

Illustration 52

Terminal locations for ECM connector P1 (4-pin sensor)

A. Thoroughly inspect ECM vehicle harness

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

connector J1/P1, the connector for the extension

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

harness for the coolant level and the terminals

for the coolant level sensor in the connectors.

D. Check the harness and wiring for abrasion and

The connector for the extension harness for the

pinch points from the sensor to the ECM.

coolant level connects the coolant level sensor to

the vehicle harness in the engine compartment

Expected Result:

of some chassis. Refer to Troubleshooting,

"Electrical Connectors - Inspect" for details.

All connectors, pins and sockets should be

completely coupled and/or inserted and the harness

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

and wiring should be free of corrosion, abrasion

wires in the ECM connector that are associated

or pinch points.

with the following connections:

Results:

P1/J1:2 +5V supply

OK Proceed to Test Step 3.

P1/J1:5 AP sensor/switch sensor common

Not OK

P1/J1:49 coolant level normal

Repair: Repair the connectors or wiring and/or

P1/J1:54 coolant level low

replace the connectors or wiring. Ensure that all

of the seals are properly in place and ensure that

the connectors are completely coupled.

Refer to Illustration 52.