Test Step 9. Disconnect the Coolant Level Sensor and Check the Supply Voltage (+5 VDC)

195

TM 9-2320-312-24-2

Troubleshooting Section

Test Step 10. Disconnect the Terminal

Expected Result:

for the Sensor Supply (+5 VDC) from the

ECM Connector

All connectors, pins and sockets should be

completely coupled and/or inserted and the harness

and wiring should be free of corrosion, abrasion

or pinch points.

Results:

OK Proceed to Test Step 9.

Not OK

Repair: Repair the connectors or wiring and/or

replace the connectors or wiring. Ensure that all

of the seals are properly in place and ensure that

the connectors are completely coupled.

Verify that the repair eliminates the problem. Clear

all diagnostic codes.

STOP.

Test Step 9. Disconnect the Coolant Level

Sensor and Check the Supply Voltage (+5

g00884813

Illustration 59

VDC)

Terminal locations on the breakout T (2-wire float sensor)

A. Turn the ignition key switch to the OFF position.

B. Disconnect the coolant level sensor from the

B. Disconnect the ECM vehicle harness connector

harness.

J1/P1.

C. Use a multimeter to measure the voltage at the

C. Install a breakout T between ECM vehicle

harness connector.

harness connector J1 and vehicle harness

connector P1.

D. Turn the ignition key switch to the ON position.

Expected Result:

E. Measure the voltage at the breakout T from

The measured voltage is between 4.5 VDC and 5.5

terminal 26 to terminal 5.

VDC.

Refer to Illustration 59.

Results:

Expected Result:

Yes The correct voltage is reaching the sensor.

The measured voltage is between 4.5 VDC and 5.5

Repair: Replace the sensor.

VDC.

STOP.

Results:

No Proceed to Test Step 10.

Yes The problem is located in the harness

wiring.

Repair: Repair the wiring or replace the wiring,

as required.

Verify that the repair eliminates the problem.

STOP.

No The problem is on the ECM side.