valve drive angle sensors run in opposite directions of each other. Throttle Valve Drive Angle sensor No. 1
(G187) displays throttle positions from 3-97 percent. Throttle Valve Drive Angle sensor No. 2 (G188) displays
throttle positions from 97-3 percent. Throttle Valve Drive Angle sensor No. 1 (G187) ranges from 3-93 percent
(0.15-4.65 volts), the larger the throttle opening the higher the percentage (voltage) reading. Throttle Valve
Drive Angle sensor No. 2 (G188) ranges from 97-3 percent (4.90-0.15 volts), the larger the throttle opening the
smaller the percentage (voltage) reading. When the engine is running (under load) the ECM can operate throttle
valve independently of driver input.
Test Requirements
Ensure throttle valve is not damaged or dirty. Ensure all fuses are okay, battery voltage is at least 11.5 volts and
fuel pump relay is okay. Ensure all electrical accessories are off and A/C is off. Ensure engine is mechanically
sound. Ensure no intake or exhaust system leaks exist. Ensure engine coolant temperature is at least 176°F (80°
C).
Test Procedure
1. Turn ignition off. Disconnect TVCM (J338) 6-pin harness connector. Using DVOM check resistance
between terminals No. 3 and 5 on TVCM. See Fig. 20 . Specification is one to 5 ohms. If resistance is
okay, go to next step. If resistance is not okay, replace faulty TVCM. Erase DTC memory. Verify repair.
Test is complete. Adapt TVCM (J338) to ECM (J220), see THROTTLE VALVE CONTROL
MODULE (J338) . For vehicles with A/T, adapt TVCM (J338) to Transmission Control Module (J217),
see A/T BASIC SETTING . On all models, perform ECM relearn procedure. See TEST DRIVE
RELEARN PROCEDURE .
2. Connect scan tool. See RETRIEVING DIAGNOSTIC TROUBLE CODES . Turn ignition on, engine
off. Following scan tool manufacturer's instructions, observe percentage reading for Throttle Valve Drive
Angle sensor No. 1 (G187) and Throttle Valve Drive Angle sensor No. 2 (G188).
3. Operate accelerator pedal slowly to Wide Open Throttle and observe percentage (voltage) readings for
Throttle Valve Drive Angle sensor No. 1 (G187) and Throttle Valve Drive Angle sensor No. 2 (G188).
Specification for Throttle Valve Drive Angle sensor No. 1 (G187) is 3 to 93 percent (0.15 to 4.65 volts).
Specification for Throttle Valve Drive Angle sensor No. 2 (G188) is 97 to 3 percent (4.90 to 0.15 volts).
If throttle valve drive angle sensor tests are not okay, go to step 6 . If throttle valve drive angle sensor
tests are okay, go to next step.
4. Check APP sensors. See DTC P0226/16610: ACCELERATOR PEDAL POSITION SENSOR 1
(G79) ACCELERATOR PEDAL POSITION SENSOR 2 (G185), IMPLAUSIBLE SIGNAL . If
APP sensors are not okay, go to next step. If APP sensors are okay. Erase DTC memory. Perform ECM
relearn procedure. See TEST DRIVE RELEARN PROCEDURE . If code did not return on test drive,
test is complete.
NOTE:
Test ranges for throttle valve drive angle sensors may not fully display on scan
tool. No idle specifications for throttle valve drive angle sensors are given by
manufacturer.
NOTE:
If TVCM (J338) is replaced it must be adapted to the ECM and A/T control
module (if equipped).
2003 Volkswagen New Beetle GLS
2002-2003 ENGINE PERFORMANCE Self-Diagnostics - 1.8L Turbo
Helpmelearn Repair Manuals
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