CAUSE B - SENSOR SIGNAL SHORTED TO SENSOR SUPPLY
PROCEDURE OR ACTION:
1. Turn truck power ON.
2. Change DMM to volts scale.
3. At sensor connector, using procedure for probing the harness, measure voltage across sensor signal pin and
sensor ground pin.
Is voltage equal to sensor supply voltage (approximately 5 Vdc)?
YES: Go to Step 4.
NO: If voltage is approximately equal to battery voltage, go to Cause C.
4. Disconnect sensor connector and repeat measurement from Step 3.
Is voltage equal to approximately 5 Vdc?
YES: Go to Step 5.
NO: Replace applicable sensor. Refer to the appropriate Electrical System SRM.
5. Ensure truck power is OFF.
6. Disconnect the indicated ECU connector.
7. Change DMM to ohms scale. Verify zero reading on DMM.
8. At sensor connector, measure resistance between the sensor signal pin and sensor supply pin.
Is resistance less than 0.5 ohms?
YES: The sensor signal wire and the sensor supply wire are shorted. Locate and repair/replace shorted wire/
connection. Refer to the appropriate Wiring Harness Repair SRM.
NO: Go to Cause C.
CAUSE C - SENSOR SIGNAL SHORTED TO BATTERY SOURCE
PROCEDURE OR ACTION:
1. Ensure truck power is OFF.
2. Disconnect the indicated connectors at sensor and applicable ECU.
3. Change the DMM to the volts scale.
4. At the sensor harness connector, measure the voltage across the sensor signal wire (+) and the negative (-)
terminal of the battery.
Is voltage approximately system voltage?
YES: The signal wire is shorted to an unswitched battery source. Refer to Electrical Schematic. Refer to the
appropriate Diagrams and Schematics SRM for unswitched battery voltage sources. Locate and repair/
replace shorted wire/connection. Refer to the appropriate Wiring Harness Repair SRM.
NO: Go to Step 5.
5. Turn truck power ON and repeat Step 4.
Is voltage approximately system voltage?
YES: The sensor signal wire is shorted to a switched battery source. Refer to Electrical Schematic. Refer to
the appropriate Diagrams and Schematics SRM for switched battery voltage sources. Locate and repair/
replace shorted wire/connection. Refer to the appropriate Wiring Harness Repair SRM.
NO: Go to Cause D.
CAUSE D - SENSOR FAILURE
PROCEDURE OR ACTION:
1. Ensure truck power is OFF.
Electrical System Diagnostic Trouble Codes
Check the Service Manual section in Hypass Online for possible updates and check pertinent Grams
Confidential/Proprietary - Do Not Copy or Duplicate 9030-20-109
Throttle Position OORH (Cont)
NOTE: Do not discard original sensor after removal.
2. Replace sensor.
3. Ensure that all connections are completely inserted.
4. Turn truck power ON.
Does reported DTC reoccur?
YES: Reinstall original sensor and go to Cause E. Refer to the appropriate Electrical System SRM.
NO: Problem has been corrected. Resume operation. Discard faulty sensor.
POSSIBLE CAUSE
A. SENSOR GROUND OPEN CIRCUIT
B. SENSOR SIGNAL SHORTED TO SENSOR SUPPLY
C. SENSOR SIGNAL SHORTED TO BATTERY SOURCE
D. SENSOR FAILURE
E. FUNCTIONAL FAILURE IN CONTROLLER
NOTE
Please refer to the end of this procedure for supporting diagrams.
COMPONENT OPERATIONAL CHECK
PROCEDURE OR ACTION:
1. Turn power to OFF for no less than 30 seconds, and then to ON to clear displayed DTC.
Does reported DTC reoccur?
YES: Go to Step 2.
NO: Problem not verified. Resume operation.
2. Conduct a quick visual inspection of all connectors/wiring associated with the displayed fault code.
Are any faults detected/observed?
YES: Repair/replace connector or wiring associated with faults found. Refer to the appropriate Electrical
System SRM.
NO: Go to Cause A.
CAUSE A - SENSOR GROUND OPEN CIRCUIT
PROCEDURE OR ACTION:
1. Ensure truck power is OFF.
2. Disconnect indicated sensor connector.
3. Turn truck power ON.
4. Change DMM to volts scale.
5. At sensor harness connector, measure voltage across sensor supply pin (+) and sensor ground pin (-).
Is voltage approximately 5 Vdc?
YES: Sensor supply circuit is OK. Go to Cause B.
NO: Go to Step 6.
6. Move negative (-) meter probe to a clean frame ground.
Is voltage approximately 5 Vdc?
YES: Sensor ground has open circuit. Locate and repair/replace open wire/connection. Refer to the appropriate
Wiring Harness Repair SRM.
Diagnostic Trouble Codes Electrical System
Check the Service Manual section in Hypass Online for possible updates and check pertinent Grams
9030-20-108 Confidential/Proprietary - Do Not Copy or Duplicate
Throttle Position OORH (Cont)
Throttle a sensor reading high.