Location of Diesel Fuel Temperature Sensor on H1 V8-65L DSL (1998)
Diesel Fuel Temperature / Fuel Pump Position Combination Sensor: Testing and Inspection
Figure 3-15: Optical/Fuel Temperature Sensor Circuit
Optical/Fuel Temperature Sensor Tests
A fault in the optical sensor or related wiring will produce fast idle and performance problems. A problem will cause a high resolution circuit fault, or a
cam reference pulse error fault.
The sensor can be checked with a scan tool and a voltmeter as follows:
High Resolution Fault Test
1. Turn ignition off.
2. Disconnect sensor harness connector.
3. Turn ignition on.
4. Connect voltmeter to sensor terminal A, of the harness, and to ground.
-
If meter indicates 5 volts, continue with test.
-
If meter indicates zero voltage, look for open/short in wire to PCM 5 volt reference terminal, connector, or PCM.
5. Connect volt/ohmmeter to a good engine ground and to sensor ground terminal D:
-
If resistance is .2 Ohms or less, proceed to next test step.
-
If resistance is greater than .2 Ohms, problem is with ground wire, connector, or sensor.