P0510

DTC P0510 Closed Throttle Position Switch Circuit:

Throttle Position (TP) System:

CIRCUIT DESCRIPTION


The Throttle Position (TP) sensor has an idle switch that sends a signal to the Engine Control Module (ECM). The ECM applies 5 volts to the idle switch. The idle switch is closed with the engine idling (low voltage signal at the ECM) and open with the engine off idle (high voltage signal at the ECM). When the ECM detects a low voltage signal the throttle valve is closed, and when the ECM detects a high voltage signal the throttle valve is open.


CONDITIONS FOR SETTING THE DTC

- High voltage input at the ECM indicated with the engine running at idle (less than 1000 RPM) and the idle switch open "OFF."

The above condition is present for 10 seconds, and occurs 3 times.

- Larger than 300 throttle valve opening and an engine speed greater than 2300 RPM with the idle switch closed "ON."

- Engine load greater than 40%.

The above condition is present for 3 seconds.


ACTION TAKEN WHEN THE DTC SETS


- The Malfunction Indicator Lamp (MIL) will illuminate.

- The ECM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame buffer.

CONDITIONS FOR CLEARING THE MIL/DTC


- The MIL will turn "OFF" after three consecutive drive cycles without a fault present.

- A DTC will clear after 40 consecutive warm-up cycles without a fault.

- DTC(s) can be cleared by using a scan tool or by disconnecting the ECM battery feed.


DIAGNOSTIC AIDS


Check the following conditions:


- Poor connection at ECM. Inspect harness connectors for backed out terminal, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.

- Damaged harness. Inspect the wiring harness for damage.

- A misadjusted TP sensor could cause the malfunction to set. Refer to TP sensor Adjustment/Replacement procedures.

If DTC P0510 cannot be duplicated, the information included in the Freeze Frame data can be useful in determining vehicle operating conditions since the DTC was last set. This may assist in determining how often the DTC sets.

If any wiring repairs need to be made, Refer to Repair Procedures in Diagrams.

TEST DESCRIPTION


Number(s) below refer to the step number(s) on the Diagnostic Table.


1. The Engine OBD System Check prompts the technician to complete some basic checks and store the freeze frame data on the scan tool if applicable. This creates an electronic copy of the data taken when the fault occurred. The information is then stored in the scan tool for later reference.

4. Review Freeze Frame data to determine when the DTC set. Always record this information.

5. The Idle Switch is located inside the TP sensor, when a faulty Idle Switch is determined, replace the TP sensor.