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P0122,P0123

P0122 , P0123

Throttle position sensor

Fault symptoms

CHECK ENGINE lamp (MIL) on. Fast idling speed. A/C compressor does not work.

Conditions

P0122 Shorting to ground Throttle position <1.2%% / < 0.06 V

P0123 Shorting to battery positive (B+)/open circuit Throttle position >95%% / >4.75 V

Diagnostic help

The position of the throttle position sensor can be ascertained with an ISAT scan tool.


- Connect the ISAT Scan Tool.

- Turn the ignition switch to the ON position.

- Select "READ FUNCTIONS".

- Select "THROTT POS SENSOR".


If the throttle position sensor is in proper working order the ISAT scan tool should show the current throttle position, between about 0.5 V and 4.5 V from unactuated to fully depressed accelerator.

Check the wiring

Intermittent faults may occur as a result of temporary short circuits and breaks in the wiring. Jiggle the wiring at several points and in different directions to ascertain whether the wiring harness, including any connectors, is causing the trouble. Observe the multimeter, ISAT scan tool or test lamp while doing this.

Diagnostic procedure

1. Check the throttle position sensor's ground connection and power supply




- Unplug the throttle position sensor's 3-pin connector.

- Turn the ignition switch to the ON position.

- Take voltage readings on the connector contacts as follows:


Are all readings OK?

yes

Continue with point 2.


no

Check the relevant lead and repair or replace it if necessary. Continue with point 3.


2. Check the control module's throttle position input



- Connect the ISAT Scan Tool.

- Turn the ignition switch to the ON position.

- Select "READ FUNCTIONS".

- Select "THROTT POS SENSOR".


The ISAT scan tool should show a reading of about 5 V (about 100%%).


- Connect a jumper lead between pins 2 and 3 of the throttle position sensor's connector.


The ISAT scan tool should show a reading of about 0 V (about 0%%).

Are all readings OK?

yes

Change the throttle position sensor. Continue with point 3.


no

Check the relevant lead and repair or replace it if necessary. Continue with point 3.


3. Final check



- Clear the diagnostic trouble code.

- Implementation of driving cycle:

- Evaluation of driving cycle:


Has the diagnostic trouble code recurred?

yes

Continue as described in .


no

The steps taken to rectify the fault were correct.


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