Troubleshooting

RENR2696-01 161
Troubleshooting Section
Test Step 6. Measure the Sensor Supply
Voltage.
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Illustration 74
A. Turn the keyswitch to the OFF position.
B. Disconnect the sensor from the engine harness.
C. Connect a 3-Terminal Breakout T to the engine
harness only. Do not connect the sensor to the
Breakout T.
D. Turn the keyswitch to the ON position.
E. Measure the voltage from the terminal “A”
(pressure sensor supply) to terminal “B” (sensor
common).
Expected Result:
The DC voltage from terminal “A” to terminal “B”
measures 4.5 to 5.5 VDC.
Results:
•
OK – The sensor supply voltage is correct.
Remove the Breakout T. Proceed to Test Step 8.
•
Not OK – The sensor supply voltage is out of the
nominal range. Continue testing the sensor supply
circuit.
Repair: Proceed to the following repair:
Troubleshooting, “5 Volt Engine Pressure Sensor
Supply Circuit - Test”
STOP.
Test Step 7. Determine If The Short
Circuit Is In The Connector Or In The
Sensor.
A. Thoroughly inspect the connector for moisture.
B. Inspect the seals and reconnect the sensor.
C. Refer to Troubleshooting, “Electrical Connectors
- Inspect”.
D. If the short circuit diagnostic code reappears, the
sensor or the pigtail harness connector is the
problem.
a. Temporarily connect a new sensor to the
harness, but do not install the new sensor in
the engine.
E. Use the electronic service tool to verify that there
is a short circuit diagnostic code. The new sensor
should be connected to the harness at this time.
Expected Result:
The short circuit diagnostic code is not present when
a new sensor is connected.
Results:
•
OK – Verify that the repair eliminates the problem.
Use the electronic service tool to clear the logged
diagnostic codes. STOP.
•
Not OK – Repair the engine harness connector.
STOP.