P0510 Closed Throttle Position Switch Malfunction
OBD-II Trouble Code Technical Description
Closed Throttle Position Switch Malfunction
This diagnostic trouble code (DTC) is a generic OBD-II powertrain code. It is considered generic because it applies to all makes and models of vehicles (1996-newer), although specific repair steps may vary depending on the model.
What does that mean?
The throttle body or linkage on certain vehicles may contain a switch that indicates to the Powertrain Control Module (PCM) or Engine Control Module (ECM) when the throttle body is in the closed position. When the throttle body is shut, the switch will be depressed or in the closed position. The PCM uses this switch so the engine will stay at idle in conjunction with the idle air control valve and/or go into a fuel cut mode while coasting.
There may also be a Wide Open Throttle (WOT) switch. If either the WOT or closed throttle switch are not engaged, the PCM or ECM may assume the throttle is partly open which could affect the air/fuel ratio.
Note: If more than one trouble code is present, such as P0120 (TPS/Pedal Position Sensor A circuit Malfunction) - there may be an open in the ground circuit or bad connection at the Throttle Position Sensor TPS).
Symptoms
Symptoms of a P0510 DTC will include illumination of the Malfunction Indicator Lamp (MIL), you will likely not notice any other symptoms.
Causes
Potential causes of a P0510 code include:
Wiring harness open circuit or loose/dirty connection Faulty closed throttle position switch Throttle body idle set screw tampered with Faulty ECMPossible Solutions
Wiring Harness - Disconnect wiring harness connector at Throttle Position Sensor (TPS) or closed throttle position switch and harness connector at PCM/ECM. Using a Digital Volt Ohm Meter (DVOM) set to ohms scale, connect leads to each end of the same wire using a wiring diagram for reference to test for continuity between the switch and the PCM/ECM. Resistance should be present in the wiring between the switch and PCM/ECM, an infinite reading would indicate an open circuit. Repair open in wiring or replace wire harness assembly.
Closed Throttle Position Switch - Disconnect wiring harness connector at TPS or closed throttle position switch and test for continuity using the DVOM with the leads on the two pins at the closed throttle position switch or the throttle position sensor, depending on the vehicle. Resistance should be present when the throttle body is in the closed position. If the throttle body linkage is not touching or fully closing switch, there may have been an adjustment made to the idle set screw. Re-adjust idle set screw to specifications using factory procedure.
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