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Throttle Valve Control Module, Checking



Throttle Valve Control Module, Checking

Recommended special tools and equipment
- VAG1526 multimeter or VAG1715 multimeter
- VAG1594 connector test kit
- Wiring diagram

Test 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 like, for example, lights and rear window heating 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, Diagnostic mode 1: Check measuring values; PID 5, Coolant temperature.

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.

If only the Throttle Position (TP) Actuator -V60- is current-less, the throlle 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.

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 8-pin connector at throttle valve control module.
- Check resistance of throttle valve control module

Check resistance






- Measure resistance of Throttle Position (TP) Actuator -V60- Terminal 1 + 2
Specified value: 3.0 to 200.0 ohms (at room temperature)

Vehicles > 08.99

- Measure resistance of Closed Throttle Position (CTP) Switch -F60- between terminals 3 + engine Ground (GND) in idle position.
Specified value: Max. 5.0 ohms (at room temperature)

- Slowly open throttle valve up to Wide Open Throttle (WOT)
Specified value: infinite ohms

Continue for all vehicles

If specified values are not obtained:
- Replace Throttle Valve Control Module -J338-.

- 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.

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 terminals 3 + 7 of connector for voltage measurement.
- Switch ignition on.
Specified value: at least 9.0 V

- Switch ignition off.

- Connect multimeter to terminals 4 + 7 for voltage measurement:
- Switch ignition on.
Specified value: at least 4.5 V

- Switch ignition off.

If specified values are not obtained:
- Connect test box to control module wiring harness.

Vehicles > 08.99






- Check wires between test box and 8-pin connector to Engine Control Module (ECM) for open circuit according to wiring diagram.
Terminal 1 + socket 27
Terminal 2 + socket 53
Terminal 3 + socket 10
Terminal 4 + socket 41
Terminal 5 + socket 40
Terminal 7 + socket 33
Terminal 8 + socket 62
Wire resistance: max. 1.5 ohms

Vehicles 09.99 >






- Check wires between test box and 8-pin connector to Engine Control Module (ECM) for open circuit according to wiring diagram.
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

Continue for all vehicles

If no malfunctions are found in wires:
- Check voltage supply of Engine Control Module (ECM)
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data.
- Generate readiness code
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