Test Step 3. Disconnect the Sensor in order to Create an Open Circuit

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TM 9-2320-312-24-2

Troubleshooting Section

Results:

Expected Result:

OK The sensor supply voltage is correct.

Either a short circuit diagnostic code is active or an

open circuit diagnostic code is active.

Proceed to Test Step 6.

Not OK The sensor supply voltage is out of

Results:

range. Continue testing the sensor supply circuit.

SHORT Circuit A short circuit diagnostic code

Proceed to Test Step 7.

is active at this time. Proceed to Test Step 3.

Test Step 5. Determine if the Short Circuit

is in the Connector or in the Sensor.

OPEN Circuit An open circuit diagnostic code

is active at this time. Proceed to Test Step 4.

A. Thoroughly inspect the connector for moisture.

Test Step 3. Disconnect the Sensor in

order to Create an Open Circuit.

B. Inspect the seals and reconnect the sensor.

C. If the short circuit diagnostic code reappears, the

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

sensor or the harness connector is the problem.

B. Disconnect the sensor connector of the sensor

a. Temporarily connect a new sensor to the

with the short circuit diagnostic code.

harness.

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

D. Check for a short circuit diagnostic code while

Wait at least 15 seconds for activation of the

the new sensor is connected to the harness.

diagnostic codes.

D. Access the "Active Diagnostic Code" screen on

Expected Result:

ET. Check for an active open circuit diagnostic

The short circuit diagnostic code is not present

code.

when a new sensor is connected.

Expected Result:

Results:

An open circuit diagnostic code for the

OK Verify that the repair eliminates the problem.

disconnected sensor is now active.

Clear the logged diagnostic codes. STOP.

Results:

Not OK Repair the engine harness connector.

OK A short circuit diagnostic code was active

STOP.

before disconnecting the sensor. An open

Test Step 6. Create a Short Circuit

circuit diagnostic code became active after

Between the Supply and the Common

disconnecting the sensor. Proceed to Test Step 5.

Terminals at the Vehicle Harness

Connector.

Not OK There is a short circuit between the

sensor harness connector and the ECM. Leave

the sensor disconnected. Proceed to Test Step 7.

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

Test Step 4. Measure the Sensor Supply

B. Fabricate a jumper wire 150 mm (6 inch) long.

Voltage.

Crimp a Deutsch terminal to both ends of the

wire.

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

C. Monitor the "Active Diagnostic Code" screen

B. Disconnect the sensor from the harness at the

before installing the jumper wire and after

fuel tank.

installing the jumper wire.

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

D. Install the jumper on the engine harness

connector. Install one end of the jumper at the

D. Set a multimeter to the "VDC" setting. Measure

sensor supply P1:15 or P1:26. Install the other

the voltage between the two terminals.

end of the jumper at the common connection

for the sensor P1:3. Wait at least 15 seconds for

Expected Result:

activation of the short circuit diagnostic code.

The DC voltage measures 4.5 to 5.5 VDC.