THROTTLE VALVE CONTROL MODULE, CHECKING Volkswagen Touareg I

THROTTLE VALVE CONTROL MODULE, CHECKING

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

Function

The throttle valve activation occurs via an electric motor (throttle drive) in the throttle valve control module. It is activated by the Engine Control Module (ECM) according to specifications of the two sensors, Throttle Position (TP) Sensor -G79- and Sender -2- for accelerator pedal position -G185- ELECTRONIC ENGINE POWER CONTROL , function of the EPC system.

Components of Throttle valve control module -J338

1. Throttle Drive (for Electronic Power Control (EPC) -G186
2. Throttle Drive Angle Sensor 1 (for Electronic Power Control (EPC)) -G187
3. Throttle Drive Angle Sensor 2 (for Electronic Power Control (EPC)) -G188

Special tools and workshop equipment required

1. Multimeter VAG 1526 or Multimeter VAG 1715
2. Connector test kit VAG 1594
3. Wiring diagram

Test requirements

Fuses in E-box (plenum chamber, left) must be OK: Refer to appropriate SYSTEMS WIRING DIAGRAM

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.

Coolant temperature must be at least 20° C, Diagnostic mode 1: Check measured values; PID 5, Coolant temperature.

Function test

Connect diagnostic tester.

Switch ignition on.

Under address word 33, select "Diagnostic mode 1: Checking measured values."

Select the measuring value "PID 17: Throttle valve position (absolute)."

Check specified value of throttle valve position (absolute) at idle stop

Slowly depress accelerator pedal up to Wide Open Throttle (WOT) stop while observing the percentage display.

The percentage display must increase uniformly.

Check specified value of throttle valve position (absolute) at Wide Open Throttle (WOT) stop

End diagnosis and switch ignition off.

If specified values are not obtained

Disconnect 6-pin connector at the throttle valve control module (arrow).

Scheme 98

Checking resistance

Measure resistance of Throttle drive (power accelerator actuation) -G186- in Throttle Valve Control Module -J338- between terminals 3 + 5

Scheme 99

Specified value: 1.0 to 5.0 ohms

If specified value is not obtained

Replace Throttle Valve Control Module -J338-, intake manifold change-over, disassembling and assembling.

Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data.

Generate readiness code.

If specified value is obtained

Check voltage supply of throttle valve control module and wiring to control module.

Check Throttle Position (TP) Sensor -G79- and Sender -2- for accelerator pedal position -G185-.

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 connector terminals 2 + 6 for voltage measurement.

Scheme 100

Switch ignition on.

Specified value: at least 4.5 V

Switch ignition off.

If there is no voltage

Connect test box to control module wiring harness, connect test box for wiring test.

Check wires between test box and 6-pin connector for open circuit according to wiring diagram

Scheme 101

Terminal 1 + socket 92

Terminal 2 + socket 83

Terminal 3 + socket 117

Terminal 4 + socket 84

Terminal 5 + socket 118

Terminal 6 + socket 91

Wire resistance: max. 1.5 ohms

Check wires for short circuit to each other, to vehicle Ground (GND) and to B+.

Specified value: infinity ohms

Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data.

Generate readiness code.

If no malfunctions are found in wires

Check voltage supply of Engine Control Module (ECM) according to wiring diagram: Refer to appropriate SYSTEMS WIRING DIAGRAM

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»(ref-499033-S06115979542012083100000) .
2. If necessary, erase the DTC memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(ref-499033-S21096260402012083100000) .
3. If the DTC memory was erased, generate readiness code. Refer to «READINESS CODE»(ref-499033-S20849915332012083100000) .