DTC P0123 Throttle Position (TP)Sensor Circuit High Voltage. Oldsmobile Intrigue 2000

For 1990-2009 cars only

Makes 🢒 Oldsmobile 🢒 2000 🢒 Intrigue 🢒 Engine 🢒 Engine Controls - 3.5L 🢒 DTC P0123 Throttle Position (TP)Sensor Circuit High Voltage

Refer to Engine Controls Schematics

A/C Pressure Switch, TPS, MAP, ECT and IAT

Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
Engine Controls Component Views
Powertrain Control Module Description
Heated O2 Sensors
Fuel Injectors
OBD II Symbol Description Notice
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Circuit Description

The throttle position (TP) sensor is a potentiometer. The TP sensor is mounted on the side of the throttle body. The TP sensor provides a voltage signal that changes relative to throttle blade angle. This signal voltage is one of the most important inputs used by the powertrain control module (PCM). The TP sensor has a 5.0 volt reference, a ground, and a signal circuit. The signal voltage varies from below 1 volt at closed throttle to about 4 volts at wide open throttle (WOT).

Conditions for Running the DTC

The engine is running.

Conditions for Setting the DTC

•	The TP sensor signal voltage is more than 4.9 volts.

•	The above conditions are present for longer than 1 second.

Action Taken When the DTC Sets

•	The PCM illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.

•

The PCM records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the PCM stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the PCM records the operating conditions at the time of the failure. The PCM writes the conditions to the Freeze Frame and updates the Failure Records.

Conditions for Clearing the MIL/DTC

•	The PCM turns the MIL OFF after 3 consecutive drive trips during which the diagnostic runs and passes.

•	A last test failed, or the current DTC, clears when the diagnostic runs and passes.

•	A History DTC clears after 40 consecutive warm-up cycles, if no other emission related diagnostic failures are reported.

•	Use a scan tool in order to clear the MIL diagnostic trouble code.

•	Interrupting the PCM battery voltage may or may not clear DTCs. This practice is not recommended. Refer to Powertrain Control Module Description , Clearing Diagnostic Trouble Codes.

Diagnostic Aids

Notice: Use the connector test adapter kit J 35616-A for any test that requires probing the following items:

•	The PCM harness connectors

•	The electrical center fuse/relay cavities

•	The component terminals

•	The component harness connector

Using this kit will prevent damage caused by the improper probing of connector terminals.

Check for a malfunctioning TP sensor: With the ignition ON and the engine OFF, observe the TP Sensor display on the scan tool while slowly depressing the accelerator to wide open throttle (WOT). If a voltage over 4.71 volts is seen at any point in normal accelerator travel, replace the TP sensor.

If DTC P0123 cannot be duplicated, the information included in the Fail Records data can be useful in determining vehicle mileage since the DTC was last set.

If the problem is intermittent, refer to Intermittent Conditions .

Test Description

Numbers below refer to the step numbers on the diagnostic table:

Components that share the TP sensor 5 volt reference A circuit include the following devices:

•	The exhaust gas recirculation valve (EGR) valve

•	The manifold absolute pressure (MAP) sensor

•	Disconnect these components one at a time while observing the TP sensor display on the scan tool. If the reading changes drastically when one of these components is disconnected, replace the component that affected the reading.

This vehicle is equipped with a PCM that utilizes an electrically erasable programmable read only memory (EEPROM). When the PCM is replaced, the new PCM must be programmed.

Step	Action	Value(s)	Yes	No
1	Did you perform the Powertrain On-Board Diagnostic (OBD) System Check?	--	Go to Step 2	Go to Powertrain On Board Diagnostic (OBD) System Check
2	With the throttle closed, observe the TP Sensor display on the scan tool. Is the TP Sensor display more than the specified value?	4.7 V	Go to Step 4	Go to Step 3
3	Turn the key to the Off position, wait 15 seconds, then turn the key to the On position. Review and record the scan tool Failure Records data. Operate the vehicle within the Failure Records conditions as noted. Using a scan tool, monitor the Specific DTC info for DTC P0123. Does the scan tool indicate DTC P0123 failed this ignition?	--	Go to Step 4	Go to Diagnostic Aids.
4	Disconnect the TP sensor electrical connector. Observe the TP Sensor display on the scan tool. Is the TP Sensor display near the specified value?	0 V	Go to Step 5	Go to Step 6
5	Probe the sensor ground circuit at the TP sensor harness connector with a test lamp connected to B+. Is the test lamp ON?	--	Go to Step 7	Go to Step 10
6	Turn the key to the Off position. Disconnect the PCM. Turn the key to the On position. Check for a short to voltage on the TP sensor signal circuit. If the TP sensor signal circuit is shorted, repair it as necessary. Refer to Wiring Repairs in Wiring Systems. Was a problem found and corrected?	--	Go to Step 13	Go to Step 12
7	Reconnect the TP sensor. Turn the key to the On position. Monitor the TP Sensor scan tool display while disconnecting each of the components that share the 5 volt reference circuit (one at a time). Refer to the Test Description. If the TP Sensor scan tool display changes, replace the component that caused the display to change when disconnected. Was a problem found and corrected?	--	Go to Step 13	Go to Step 8
8	Turn the key to the Off position. Disconnect the PCM. Turn the key to the On position. Check for a short to voltage on the 5 volt reference circuit. If the 5 volt reference circuit is shorted, repair it as necessary. Refer to Wiring Repairs in Wiring Systems. Was a problem found and corrected?	--	Go to Step 13	Go to Step 9
9	Check for poor electrical connections at the TP sensor and replace the terminals if necessary. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. Was a problem found and corrected?	--	Go to Step 13	Go to Step 11
10	Turn the key to the Off position. Disconnect the PCM, and check the sensor ground circuit for a poor connection at the PCM or for an open sensor ground circuit to the TP sensor. If a problem is found, repair it as necessary. Refer to Testing for Intermittent Conditions and Poor Connections or Wiring Repairs in Wiring Systems. Was a problem found and corrected?	--	Go to Step 13	Go to Step 12
11	Replace the TP sensor. Refer to Throttle Position Sensor Replacement . Is the action complete?	--	Go to Step 13	--
12	Important: The replacement PCM must be programmed. Replace the PCM. Refer to Powertrain Control Module Replacement/Programming . Is the action complete?	--	Go to Step 13	--
13	Clear the DTCs with the scan tool. Turn the key to the OFF position and wait 15 seconds. Operate the vehicle within the conditions that are required for this diagnostic to run. Refer to Conditions for Running the DTC. Does the scan tool indicate that this test ran and passed?	--	Go to Step 14	Go to Step 2
14	Review the Captured Info using the scan tool. Are there any DTCs that have not been diagnosed?	--	Go to the applicable DTC table	System OK