Mazda Miata closed throttle position

[Justin]

I recently got a check engine light for code P0510 which is closed throttle position switch malfunction. Does anyone have any experience with this? The car is a 1997 Miata 5 speed equipped with Jackson racing supercharger. Any help is appreciated thanks.

Topic

[dan]

Likely a faulty throttle position sensor, check the wiring and connections first, more than likely however it is a bad throttle position sensor.

also have a gander at this link
http://forum.miata.net/vb/showthread.php?t=168387

keep us posted

[Justin]

I replaced the throttle position sensor and the cel is still on. Did I do something wrong or does it take some time for the car to recognize it?

[Justin]

bump

[EricTheCarGuy]

I was able to pull up this diagnostic procedure for that code from the Mazda manual.

P0510 Closed Throttle Position Switch Circuit Malfunction – Manual Transmission
Possible Causes Setting Conditions
Closed throttle switch circuit is open, shorted to ground or shorted to voltage
Closed throttle switch has failed
CTP connector is damaged (check pins for damage, and for moisture)
PCM has failed
Engine running at idle speed, and the PCM detected the CTP switch signal was less than 2.0v for over 33 seconds, or the CTP switch signal was more than 8.0v for 33 seconds. Note: This test is stopped if the TP sensor signal is less than 0.9v.

Malfunction Indicator Lamp (Manual and Automatic Transmission)
Malfunction Indicator Lamp

The Malfunction Indicator Lamp (MIL) alerts the driver that the Powertrain Control Module (PCM) has detected an OBD II emission-related component or system fault. When this type of malfunction occurs, an OBD II Diagnostic Trouble Code (DTC) will be set by the PCM. The MIL is located on the instrument cluster and is labeled CHECK ENGINE, SERVICE ENGINE SOON, or is identified with an ISO standard engine symbol (i.e., a picture of an engine).Bulb TestEach time the ignition switch is turned to the “on” position, the MIL indicator is illuminated for about 3 seconds (which is a function of the PCM).

MIL Lamp-On Message

Each time the PCM detects an Emissions related fault, the MIL is illuminated to inform the driver that the vehicle needs to be taken in for service.

COMPONENT MONITOR DRIVE CYCLE INSTRUCTIONS
· Do not turn off the ignition switch during the test procedure.
· All Onboard Diagnostic Monitors are cleared when the battery is disconnected or when the Powertrain Control Module (PCM) is cleared with the Scan Tool.
· This drive cycle can be used to determine if the Readiness code for this Monitor will run and complete, and if the MIL will remain off after the vehicle is driven.
· Operating Ranges: When a range of values is provided, try to operate the vehicle in the middle of the range. For example, if the vehicle speed range calls for 45-55 mph, drive the vehicle as close as possible to 50 mph. If the engine speed should be 1,000-2,000 rpm, try to operate the engine at 1,500 rpm.
· Scan Tool Data: There are certain Parameter Identification (PID) values that must be within range before this Monitor will “run”. It can be helpful to pull up those PID items on the Scan Tool so an assistant can view them during testing.
· The Readiness code for this Monitor defaults to “continuous” or “monitoring” because this Monitor runs continuously when the engine is cranking or running.

COMPONENT MONITOR PRETEST CONDITIONS
· MIL off with no emission related DTC’s present
· Battery voltage from 11-16v
· Drive vehicle as described below

TEST PROCEDURE
1. Connect the Scan Tool to the data link connector (DLC). Use the Scan Tool to clear any stored DTC’s and to reset the OBD Monitors.
2. Start the engine and allow it to run at idle speed for at 1-2 minutes.
3. Accelerate at part-throttle to 50 mph and maintain that speed for 15 seconds. Bring the vehicle to a stop, and allow the engine to idle with the transmission in Drive (in Neutral for M/T) for 2 minutes.
4. Then accelerate at moderate throttle to 50 mph and maintain that speed for 15 seconds. Bring the vehicle to a stop, and then accelerate to 65 mph and maintain that speed for 15 seconds. Bring the vehicle to a stop in a safe place, but do not turn off the ignition key.
5. Check for any Pending codes in the Generic OBD II section of the Scan Tool. If no Pending codes are set, the Component Monitor test is complete. If any Pending codes are set, refer to the appropriate trouble code repair information to make the repair.

Keep us posted on your progress.

[EricTheCarGuy]

I was able to pull up this diagnostic procedure for that code from the Mazda manual.

P0510 Closed Throttle Position Switch Circuit Malfunction – Manual Transmission
Possible Causes Setting Conditions
Closed throttle switch circuit is open, shorted to ground or shorted to voltage
Closed throttle switch has failed
CTP connector is damaged (check pins for damage, and for moisture)
PCM has failed
Engine running at idle speed, and the PCM detected the CTP switch signal was less than 2.0v for over 33 seconds, or the CTP switch signal was more than 8.0v for 33 seconds. Note: This test is stopped if the TP sensor signal is less than 0.9v.

Malfunction Indicator Lamp (Manual and Automatic Transmission)
Malfunction Indicator Lamp

The Malfunction Indicator Lamp (MIL) alerts the driver that the Powertrain Control Module (PCM) has detected an OBD II emission-related component or system fault. When this type of malfunction occurs, an OBD II Diagnostic Trouble Code (DTC) will be set by the PCM. The MIL is located on the instrument cluster and is labeled CHECK ENGINE, SERVICE ENGINE SOON, or is identified with an ISO standard engine symbol (i.e., a picture of an engine).Bulb TestEach time the ignition switch is turned to the “on” position, the MIL indicator is illuminated for about 3 seconds (which is a function of the PCM).

MIL Lamp-On Message

Each time the PCM detects an Emissions related fault, the MIL is illuminated to inform the driver that the vehicle needs to be taken in for service.

COMPONENT MONITOR DRIVE CYCLE INSTRUCTIONS
· Do not turn off the ignition switch during the test procedure.
· All Onboard Diagnostic Monitors are cleared when the battery is disconnected or when the Powertrain Control Module (PCM) is cleared with the Scan Tool.
· This drive cycle can be used to determine if the Readiness code for this Monitor will run and complete, and if the MIL will remain off after the vehicle is driven.
· Operating Ranges: When a range of values is provided, try to operate the vehicle in the middle of the range. For example, if the vehicle speed range calls for 45-55 mph, drive the vehicle as close as possible to 50 mph. If the engine speed should be 1,000-2,000 rpm, try to operate the engine at 1,500 rpm.
· Scan Tool Data: There are certain Parameter Identification (PID) values that must be within range before this Monitor will “run”. It can be helpful to pull up those PID items on the Scan Tool so an assistant can view them during testing.
· The Readiness code for this Monitor defaults to “continuous” or “monitoring” because this Monitor runs continuously when the engine is cranking or running.

COMPONENT MONITOR PRETEST CONDITIONS
· MIL off with no emission related DTC’s present
· Battery voltage from 11-16v
· Drive vehicle as described below

TEST PROCEDURE
1. Connect the Scan Tool to the data link connector (DLC). Use the Scan Tool to clear any stored DTC’s and to reset the OBD Monitors.
2. Start the engine and allow it to run at idle speed for at 1-2 minutes.
3. Accelerate at part-throttle to 50 mph and maintain that speed for 15 seconds. Bring the vehicle to a stop, and allow the engine to idle with the transmission in Drive (in Neutral for M/T) for 2 minutes.
4. Then accelerate at moderate throttle to 50 mph and maintain that speed for 15 seconds. Bring the vehicle to a stop, and then accelerate to 65 mph and maintain that speed for 15 seconds. Bring the vehicle to a stop in a safe place, but do not turn off the ignition key.
5. Check for any Pending codes in the Generic OBD II section of the Scan Tool. If no Pending codes are set, the Component Monitor test is complete. If any Pending codes are set, refer to the appropriate trouble code repair information to make the repair.

Keep us posted on your progress.

[Author]

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