P0510

Closed Throttle Position Switch Circuit:

Connector: C-71:

CIRCUIT OPERATION
- A 5-volt voltage is applied on the closed throttle position switch output terminal (terminal 2) from the PCM (terminal 79) via a resistor in the PCM. The ground terminal (terminal 1) is grounded with the PCM (terminal 57).

TECHNICAL DESCRIPTION
- The closed throttle position switch converts whether the accelerator pedal is pressed down or not into a high/low voltage, and inputs it to the PCM.
- While the engine is at idle without pressing the accelerator pedal, "ON" signal can be input from the closed throttle position switch to PCM.
- The PCM check the input signal during engine idling.

DTC SET CONDITIONS

Check Area
- TPS output voltage is 2 volts or more.

Judgment Criteria
- Closed throttle position switch shows "ON".

Check Area
- After driving for two seconds or more at 30 km/h (19 mph), stop the vehicle. Repeat this driving and stopping for 15 times or more.

Judgment Criteria
- Closed throttle position switch shows "OFF".

TROUBLESHOOTING HINTS
The most likely causes for this code to be set are:
- Closed throttle position switch failed.
- Open of shorted closed throttle position switch circuit, or loose connector.
- PCM failed.

DIAGNOSIS
Required Special Tool:
MB991502: Scan Tool (MUT-II)

CAUTION: To prevent damage to the scan tool, turn the ignition switch "OFF" before connecting or disconnecting the scan tool.




STEP 1. Using scan tool MB991502, check data list item 26: Closed Throttle Position Switch.
- With the throttle valve at the idle position the switch should be "ON".
- With the throttle valve slightly open the switch should be "OFF".

If not within specifications, go to Step 2.

If not within specifications, it can be assumed that this malfunction is intermittent. Refer to vehicle level Testing and Inspection.

STEP 2. Check the closed throttle position switch.
1. Disconnect the closed throttle position switch connector A-41.




2. Check for continuity between the closed throttle position switch side connector terminal 1 and 2.

- There should be continuity when the throttle valve is set to the idle position. (400 ohms or less)
- There should be no continuity when the throttle valve is opened slightly.

If all checks above meet the specifications, go to Step 3.

If any check above does not meet the specifications, replace the throttle position sensor. Refer to Throttle Body. Then go to Step 6.

STEP 3. Check the circuits at the closed throttle position switch connector A-41.
1 Disconnect connector A-41 and measure at the harness side.
2. Turn the ignition switch "ON".




3. Measure voltage between terminal 2 and ground.
- The voltage should be 4.0 volts or more.

4. Turn the ignition switch "OFF".




5. Check for continuity between terminal 1 and ground.
- There should be continuity (0 ohms).

If not within specifications, go to Step 4.

If not within specifications, repair or replacing the closed throttle position switch connector A-41. Refer to vehicle level Testing and Inspection. Then go to Step 6.







STEP 4. Check the harness wire between the closed throttle position switch connector A-41 and the PCM connectors C-90, C-91.

NOTE: After inspecting the intermediate connector C-71, inspect the wire. If the intermediate connector C-71 is damaged, repair or replace it. Refer to vehicle level Testing and Inspection. Then go to Step 6

If the wires between the closed throttle position switch connector A-41 and the PCM connectors C-90, C-91 are not damaged, go to Step 5.

If the wires between the closed throttle position switch connector A-41 and the PCM connectors C-90, C-91 are damaged, repair them. Then go to Step 6.




STEP 5. Check harness connectors C-90, C-91 at the PCM for damage.
If harness connectors C-90, C-91 are damaged, repair or replace them. Refer to vehicle level Testing and Inspection.

If harness connectors C-91, C-91 are in good condition, replace the PCM.

Then go to Step 6.

STEP 6. Test the OBD-II drive cycle
1. Carry out a test drive with the drive cycle pattern. Refer to Procedure 6 - Other Monitor.

2. Read the diagnostic trouble code, and confirm that a diagnostic trouble code is not being output.