A4 Quattro Wagon L4-2.0L Turbo (BPG) (2005)
Electronic Throttle Control Module: Testing and Inspection
Throttle Valve Control Module J338, Checking
Special tools, testers and auxiliary items required
-
Multimeter V.A.G 1526 or equivalent.
-
Test Box 105 Pin VAG1598/42.
-
Adapter Lead Vag1598/39 VAG1598/39.
-
Adapter cable V.A.G 1598/39-1.
NOTE: Use only gold-plated terminals when servicing terminals in harness connector of Throttle Valve Control Module J338.
Test requirements
-
Fuses for Engine Control Module (ECM) J623 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.
-
Throttle valve must not be damaged or dirty.
-
Coolant Temperature at least 80 degrees C.
Function
Throttle valve operation occurs via an electric motor ( Throttle Drive (for Electronic Power Control (EPC)) G186 ) in the Throttle Valve Control Module
J338 and is operated by the Engine Control Module (ECM) J623 according to the signals supplied by the Throttle Position (TP) Sensor G79 /
Accelerator Pedal Position Sensor 2 G185.
Components of Throttle Valve Control Module J338 :
-
Throttle Drive (for Electronic Power Control (EPC)) G186
-
Throttle Drive Angle Sensor 1 (for Electronic Power Control (EPC)) G187
-
Throttle Drive Angle Sensor 2 (for Electronic Power Control (EPC)) G188
Function test
-
Connect the diagnostic tester.
-
Switch ignition on.
-
Select "Diagnostic mode 1: Check measured values".
-
Select the measuring value "PID 17: Throttle valve position" .
-
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:
-
Remove Throttle Valve Control Module J338 far enough so that terminals of connector on Throttle Valve Control Module J338 are reached.