Vehicles with adjustable throttle position sensor

Vehicles with non-adjustable throttle position sensor

Special tools, testers and auxiliary items required 

Fig 1: Identifying Special Tools - Throttle Position Sensor, Checking (Vehicles With Adjustable Throttle Position Sensor)

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• Portable multimeter V.A.G 1526 A
• Test adapter kit V.A.G 1594
• Test box V.A.G 1598/22
• Test box V.A.G 1598/31

Not illustrated:

Special tools, testers and auxiliary items required 

• Scan tool V.A.G 1551 or mobile scan tool V.A.G 1552 and cable V.A.G 1551/3
• Wiring diagram

Test sequence 

• Connect scan tool V.A.G 1551 (VAG 1552) and select control module for engine electronics with "address word" 01. For this, the ignition must be switched on: Refer to 01 ON BOARD DIAGNOSTIC (OBD) from M.Y. 99-01 or 01 ON BOARD DIAGNOSTIC (OBD) from M.Y. 2002 and on

Scan tool display:

• Press buttons 0 and 8 for the function "Reading measuring value blocks" and press Q button to confirm input.

Scan tool display:

• Press buttons 0 0 and 2 for the "Display group number 2" and press Q button to confirm input.
• Check the reading of the throttle position in display field 2. Do NOT depress the accelerator pedal. Specification: 0.0%

• Also, check the reading for the idle switch in display field 3. The center digit must be set at 1. Reading: 010
• Slowly depress accelerator pedal and observe display fields 2 and 3.

• Display field 2: Throttle position value must increase continuously. Specified value for wide open throttle position: 100%
• Display field 3: The center digit must change to 0. Reading: 000

If final specification is not obtained:

• Press → button.
• Press buttons 0 and 6 for the function "End data transfer" and press Q button to confirm input.
• Switch ignition off.
• Adjust throttle position sensor G79. Refer to Adjusting Throttle Position (TP) sensor  .

If reading does not change or only temporarily:

• Check throttle position sensor G79 as follows:
• Press → button
• Press buttons 0 and 6 for the function "End data transfer" and press Q button to confirm input.
• Switch ignition off.

• Disconnect 6-pin harness connector for throttle position sensor G79.

Fig 2: Identifying Sensor Terminals

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• Measure resistance of sensor between terminals 1 + 3 of connector. Specification: Throttle in idle position: 0.8 to 1.4 kΩ
• Measure resistance of sensor between terminals 2 + 3 of connector. Specification: Throttle in idle position: 0.8 to 1.4 kΩ
• Check Closed Throttle Position (CTP) Switch F60 in throttle position sensor. For this, measure resistance between terminals 4 + 6 of connector. Specification: Throttle in idle position: 0.8 to 1.2 kΩ. Accelerator pedal depressed: ∞ Ω

Vehicles with automatic transmission 

• Measure resistance of sensor between terminals 5 + 6 of connector. Specification: Throttle in idle position: ∞ Ω Accelerator pedal depressed: 0.8 to 1.2 kΩ

Continue for all vehicles 

If specifications are not obtained:

• Replace Throttle Position (TP) Sensor G79. Item.

If specified values are achieved:

Fig 3: Identifying Test Box V.A.G 1598/22 Connected To Control Module Wiring Harness

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• Connect test box V.A.G 1598/22 to control module wiring harness.

Fig 4: Identifying Terminal Pins

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• Check for open circuits in wires between test box and connector according to wiring diagram. Terminal 1 + Socket 24 Terminal 2 + Socket 11 Terminal 3 + Socket 23 Terminal 4 + Socket 12 Terminal 6 + Socket 25. Vehicles with automatic transmission Terminal 5 + Socket 8 Harness resistance: max. 1.5 Ω
• Check wires for short circuit to each other, to vehicle Ground (GND) and to B+. Specification: ∞ Ω

If no malfunction is detected in the wiring:

• Replace Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) J248. Refer to 23 DIESEL FUEL INJECTION for M.Y. 99-01, or 23 DIESEL FUEL INJECTION from M.Y. 2002 and on