Throttle Position Sensor And Accelerator Pedal Position Sensor 2, Checking

Special tools and workshop equipment required 

• Multimeter.
• Wiring diagram

Test requirement 

• The Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) -J248- fuses OK.
• Battery voltage at least 12.5 volts.
• All electrical consumers such as, lights and rear window defroster, switched off.
• Vehicles with automatic transmission, shift selector lever into position "P" or "N".
• A/C switched off.
• Ground (GND) connections between engine/transmission/chassis OK.

Test procedure 

-- Perform a preliminary check to verify the customers complaint. Refer to GENERAL DIAGNOSIS .

Start diagnosis 

-- Remove the engine cover.

Checking internal resistance 

-- Disconnect the Throttle Position Sensor G79 and Accelerator Pedal Position Sensor 2 G185 electrical harness connector.

-- Using a multimeter, check the Throttle Position Sensor G79 and Accelerator Pedal Position Sensor 2 G185 terminals 1 to 3 for resistance.

Specified value: 1000 to 1500 Ω

-- Depress the accelerator pedal.

Specified value: 1000 to 2500 Ω

If either specification was not obtained:

-- Replace the Throttle Position Sensor G79 and Accelerator Pedal Position Sensor 2 G185.

If the specifications were obtained:

Checking wiring 

-- Install the test box. Refer to 68-PIN TEST BOX ADAPTER, VAG1598/19, INSTALLING .

If the manufacturers test box is not being used, perform the following step.

-- Remove the Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) -J248-. Refer to DIESEL DIRECT FUEL INJECTION ECM, REPLACING .

-- Using a Multimeter --, check the Throttle Position Sensor G79 and Accelerator Pedal Position Sensor 2 G185 electrical harness connector terminals to the Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) -J248- electrical connector for an open circuit.

Throttle Position Sensor G79 and Accelerator Pedal Position Sensor 2 G185 electrical harness connector terminals	Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) -J248- electrical harness connector T94 or test box socket
1	15
2	84
3	39
4	83
5	17
6	61

Specified value: 1 Ω max.

If the specification is not obtained:

-- Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).

-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

-- If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring and if the voltage supply was OK:

-- Replace the Throttle Position Sensor G79 and Accelerator Pedal Position Sensor 2 G185.

-- Erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .

-- Perform a road test to verify repair.

If the DTC does not return:

Repair complete, Generate readiness code. Refer to READINESS CODE .

-- End diagnosis.

If the DTC does return and no malfunction is detected in the wiring and the voltage supply was not OK:

-- Replace the Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) -J248-. Refer to DIESEL DIRECT FUEL INJECTION ECM, REPLACING .

-- Assembly is performed in the reverse of the removal.

Final procedures 

After the repair work, the following work steps must be performed in the following sequence:

1. Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY .
2. If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
3. If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .