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Throttle Position Sensor: Testing and Inspection

Throttle Position Sensor G79 And Accelerator Pedal Position Sensor 2 G185, Checking

Special tools, testers and auxiliary items required

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Multimeter.

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Wiring diagram

Test requirement

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The Motronic Engine Control Module (ECM) J623 fuses OK.

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Battery voltage at least 12.5 volts.

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All electrical consumers such as, lights and rear window defroster, switched off.

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Vehicles with automatic transmission, shift selector lever into position "P" or "N".

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A/C switched off.

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Ground (GND) connections between engine/transmission/chassis OK.

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Ignition off

Test procedure

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Perform a preliminary check to verify the customers complaint.  See: Powertrain Management/Computers and Control Systems/Testing and
Inspection/Scan Tool Testing and Procedures/Preliminary Check

Start diagnosis

NOTE:  Use only gold-plated terminals when servicing the electrical harness connector terminals in Throttle Position (TP) Sensor G79 / Accelerator
Pedal Position Sensor 2 G185.

Test sequence

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Remove the steering column cover.

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Disconnect the Throttle Position (TP) Sensor G79 / Accelerator Pedal Position Sensor 2 G185 electrical harness connector.

Checking voltage supply and wiring

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Switch the ignition on.

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Using a Multimeter, check the following wiring connections for voltage.

Throttle Position (TP) Sensor

Specified value

G79 / OR Kick Down Switch/Closed
Throttle Position Sw G185, checking
1 to Ground (GND)

about 5 V

1 to 5

about 5 V

2 to Ground (GND)

about 5 V

2 to 3

about 5 V

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Switch the ignition off.

If the specification is not obtained:

Checking wiring

If the manufacturers test box is being used. Perform the following step.

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Install the test box.

Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Fuel Delivery and Air Induction > Throttle Position Sensor > Component Information > Locations > Page 1026

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