With Generic Scan Tool

Throttle valve control module, checking

Note: Use only gold-plated termThals when servicing termhals in harness connector of throttle valve control module.

Vehicles with engine code AEG (80-pin ECM)

Function

Components of throttle valve control module -J338-
^ Closed Throttle Position (CTP) switch -F60-
^ Throttle Position (TP) sensor -G69-
^ Throttle Position (TP) sensor -G88-
^ Throttle Position (TP) actuator -V60-

If the complete throttle valve control module is current-less (e.g. connector disconnected) the throttle valve moves into a particular, specified mechanical position, which signals an increased idle speed with an engine at operating temperature.

f only the Throttle Position (TP) actuator -V60- is current-less, the throttle valve also moves into the specified mechanical position (emergency running gap), however, since Closed Throttle Position (CTP) switch -F60- can still be recognized, an "almost normal" is reached via the respective ignition angle retardation.

If the Engine Control Module (ECM) detects a malfunction at Throttle Position (TP) sensor -G69-, Throttle Position (TP) actuator -V60- is switched current-less by the Engine Control Module (ECM) and the throttle valve moves into the specified mechanical position (emergency running gap) again.

Note: Terminal assignment at throttle control module is different in vehicles with and without cruise control. Characteristic: Steering column switch with operating unit for cruise control.

Recommended special tools and equipment

^ V.A.G 1526 multimeter or V.A.G 1715 multimeter
^ V.A.G 1594 connector test kit
^ Wiring diagram

Requirements






^ The respective fuses of Motronic Engine Control Module (ECM) -J220- must be OK:
^ Battery voltage must be at least 11.5 volts.
^ All electrical consumers such as, lights and rear window defroster must be switched off.
^ Parking brake must be engaged or else daylight driving lights will be switched on.
^ If vehicle is equipped with an A/C system, it must be switched off.
^ Ground (GND) connections between engine and chassis must be OK.
^ Throttle valve must not be damaged or dirty.
^ Throttle valve must be in Closed Throttle Position (CTP).
^ Adjustment of accelerator pedal cable must be OK.
^ Coolant temperature must be at least 80°C

Work sequence

- Disconnect 8-pin connector at throttle valve control module.

Checking resistance





- Measure resistance of Throttle Position (TP) Actuator -V60- between the following terminals.
Vehicles with cruise control:
Terminal 7 + 8
Specified value: 3 to 200 ohms

Vehicles without cruise control:
Terminal 1 + 2
Specified value: 3 to 200 ohms

If specified value is not obtained:
- Replace Throttle Valve Control Module -J338-.
- Erase DTC memory of Engine Control Module (ECM)
- Generate readiness code => page ST-65.

If specified value is obtained:
- Check voltage supply of throttle valve control module and wiring to control module

If voltage supply and wires are OK:
- Replace Motronic Engine Control Module (ECM) -J220-

Checking voltage supply and wiring to control module





- Connect multimeter to the following connector terminals for voltage measurement.

Vehicles with cruise control:
Terminal 2 + 5

Vehicles without cruise control:
Terminal 4 + 7

- Switch ignition on.

Specified value: at least 4.5 V

- Switch ignition off.





- Connect multimeter to the following connector terminals for voltage measurement:

Vehicles with cruise control:
Terminal 2 + 6

Vehicles without cruise control:
Terminal 3 + 7

- Switch ignition on.

Specified value: at least 9.0 V

- Switch ignition off.
- Connect test box to control module wiring harness.





- Check wires between test box and 8-pin connector for open circuit according to wiring diagram.

Vehicles with cruise control:
Terminal 1 + socket 74
Terminal 2 + socket 67
Terminal 4 + socket 75
Terminal 5 + socket 62
Terminal 6 + socket 69
Terminal 7 + socket 59
Terminal 8 + socket 66
Wire resistance: max. 1.5 ohms

Vehicles without cruise control:
Terminal 1 + socket 66
Terminal 2 + socket 59
Terminal 3 + socket 69
Terminal 4 + socket 62
Terminal 5 + socket 75
Terminal 7 + socket 67
Terminal 8 + socket 74
Wire resistance: max. 1.5 ohms

- Check wires for short circuit to each other, to vehicle Ground (GND) and to B+. Specified value: infinite ohms

If no malfunctions are found in wires:
- Check voltage supply of Engine Control Module (ECM)
- Erase DTC memory of Engine Control Module (ECM)
- Generate readiness code