Volkswagen New Beetle. Manual - part 1819

Angle sensor No. 1 (G187) and Throttle Valve Drive Angle sensor No. 2 (G188) at idle stop.
Specification for Throttle Valve Drive Angle sensor No. 1 (G187) is 3 to 16 percent. Specification for
Throttle Valve Drive Angle sensor No. 2 (G188) is 97 to 82 percent.

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 accelerator pedal position sensors. See DTC P0226/16610 . If accelerator pedal position sensors

are not okay, go to next step. If accelerator pedal position 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.

5. Replace accelerator pedal position sensors as necessary. Erase DTC memory. Verify repair. Test is

complete. For vehicles with A/T, adapt accelerator pedal position sensors to Transmission Control
Module (J217). See A/T BASIC SETTING . On all models, perform ECM relearn procedure. See TEST
DRIVE RELEARN PROCEDURE .

6. Turn ignition off. Disconnect ECM harness connector. Leave ECM disconnected from test box. Connect

Test Box (VAG 1598/31) to ECM harness connector. See CONNECTING VAG TEST BOX . Using
DVOM, check resistance between TVCM (J338) 6-pin harness connector and test box sockets. See
TVCM (J338) 6-PIN HARNESS CONNECTOR/VAG TEST BOX SOCKET IDENTIFICATION
table. Record resistance readings. Resistance should be a maximum of 1.5 ohms for each reading. Check
wiring in TVCM (J338) 6-pin harness connector for short circuits to one another, and for short circuits to
B+ and ground. If resistance measurements are okay and no short circuits exist, go to next step. If any
resistance measurement is not okay, or a short circuit exists, repair circuit(s) as necessary. After repairs,
erase DTC memory. Verify repair. Test is complete. Perform ECM relearn procedure. See TEST DRIVE
RELEARN PROCEDURE .

7. Turn ignition on. Using DVOM, measure voltage between TVCM (J338) 6-pin harness connector

specified terminals. See TVCM (J338) VOLTAGE SPECIFICATIONS table. See Fig. 20 . Record
voltage readings. If voltage readings are not okay, go to next step. If voltage readings are okay, resistance
measurements are okay and no short circuits exist, replace faulty TVCM. After repairs, 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 .

8. Check ECM voltage supply. See ECM GROUND & VOLTAGE SUPPLY under ECM (J220) - ME

SFI CONTROL MODULE. If ECM ground circuits and ECM voltage supply are okay, go to next step. If
ECM ground circuits and/or ECM voltage supply are not okay, repair as necessary. After repairs, erase
DTC memory. Verify repair. Test is complete. Perform ECM relearn procedure. See TEST DRIVE
RELEARN PROCEDURE .

9. Replace faulty ECM. See ENGINE CONTROL MODULE REMOVAL & INSTALLATION . Erase

DTC memory. Verify repair. Test is complete. Perform ECM relearn procedure. See TEST DRIVE
RELEARN PROCEDURE .

DTC P0226/16610: ACCELERATOR PEDAL POSITION SENSOR 1 (G79) ACCELERATOR PEDAL
POSITION SENSOR 2 (G185) - IMPLAUSIBLE SIGNAL

2003 Volkswagen New Beetle GLS

2001-2003 ENGINE PERFORMANCE Self-Diagnostics - 2.0L - Beetle, Golf & Jetta (Engine Codes AVH & AZG)

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Circuit/Component Description

Accelerator Pedal Position (APP) sensor No. 1 (G79) and APP sensor No. 2 (G185) are located together as one
unit in pedal assembly. APP sensors sense the position of the accelerator pedal, not throttle position.

When the engine is running (under load) the ECM can operate throttle valve independently of driver input.

APP sensor No. 1 (G79) and APP sensor No. 2 (G185) communicate driver's intentions to ECM, fully
independent of each other. Specification for APP sensor No. 1 (G79) is 12-96 percent (0.60-4.9 volts). APP
Sensor No. 2 (G185) ranges from 4-50 percent (0.20-2.50 volts), the larger the throttle opening the higher the
percentage (voltage) reading.

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). On vehicles with M/T, gear shifter must be in neutral with parking brake set. On vehicles with A/T, selector
lever must be in park or neutral with parking brake set.

Test Procedure

1. Connect scan tool. See RETRIEVING DIAGNOSTIC TROUBLE CODES . Turn ignition on, engine

off. Following scan tool manufacturer's instructions, observe percentage reading on APP sensors No. 1
(G79) and No. 2 (G185).

2. Operate accelerator pedal slowly to Wide Open Throttle and observe percentage (voltage) readings for

APP sensor No. 1 (G79) and APP sensor No. 2 (G185). Specification for APP sensor No. 1 (G79) is 12 to
97 percent (0.60 to 4.9 volts). Specification for APP sensor No. 2 (G185) is 4 to 50 percent (0.20 to 2.50
volts). If percentage (voltage) is not okay, go to next step. If percentage (voltage) is okay, erase DTC
memory. Test is complete. Perform ECM relearn procedure. See TEST DRIVE RELEARN
PROCEDURE .

3. Turn ignition off. Remove drive's side footwell cover and trim as necessary. Disconnect APP sensors 6-

pin harness connector. Turn ignition on. Check voltage supply at 6-pin harness connector. See Fig. 26 .
See APP SENSOR VOLTAGE SPECIFICATIONS table. Turn ignition off. If no voltage is present, go
to next step. If voltage tests are okay, erase DTC memory. Test is complete. Perform ECM relearn
procedure. See TEST DRIVE RELEARN PROCEDURE .

APP SENSOR VOLTAGE SPECIFICATIONS

NOTE:

Test ranges for accelerator position sensors may not fully display on scan tool.
Percentage (voltage) should always be twice as large for APP sensor No. 1
(G79) as the percentage (voltage) for APP sensor No. 2 (G185). No idle
specifications for APP sensors are given by manufacturer.

APP Sensor Harness Connector Terminals

Voltage

1 & Ground

Minimum 4.5

1 & 5

Minimum 4.5

2003 Volkswagen New Beetle GLS

2001-2003 ENGINE PERFORMANCE Self-Diagnostics - 2.0L - Beetle, Golf & Jetta (Engine Codes AVH & AZG)

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Turn ignition off. Disconnect ECM harness connector, leave ECM disconnected from test box. Connect
Test Box (VAG 1598/31) or (VAG 1598/22) to ECM harness connector. See CONNECTING VAG
TEST BOX . Using DVOM, check resistance between APP sensor circuits and test box sockets. See
APP SENSOR 6-PIN HARNESS CONNECTOR/VAG TEST BOX SOCKET IDENTIFICATION
table. Record resistance readings. Resistance should be a maximum of 1.5 ohms for each reading. Check
wiring in APP sensor 6-pin harness connector for short circuits to one another, and for short circuits to B+
and ground. If resistance measurements are okay and no short circuits exist, go to next step. If any
resistance measurement is not okay, or a short circuit exists, repair circuit(s), as necessary. After repairs,
erase DTC memory. Verify repair. Test is complete. Perform ECM relearn procedure. See TEST DRIVE
RELEARN PROCEDURE .

APP SENSOR 6-PIN HARNESS CONNECTOR/VAG TEST BOX SOCKET IDENTIFICATION

Replace faulty APP sensors No. 1 (G79) and No. 2 (G185). Accelerator position sensors are an integral
part of the accelerator pedal assembly. After repairs, erase DTC memory. Adapt APP sensors to
Transmission Control Module (J217). See A/T BASIC SETTING . Verify repair. Test is complete.
Perform ECM relearn procedure. See TEST DRIVE RELEARN PROCEDURE .

2 & Ground

Minimum 4.5

2 & 3

Minimum 4.5

NOTE:

If accelerator pedal assembly is replaced, APP sensors must be adapted
to the A/T Control Module.

APP Sensor 6-Pin Harness Connector Terminal

VAG Test Box Socket

NOTE:

APP sensor harness connector terminal No. 5 is for A/T models only.

2003 Volkswagen New Beetle GLS

2001-2003 ENGINE PERFORMANCE Self-Diagnostics - 2.0L - Beetle, Golf & Jetta (Engine Codes AVH & AZG)

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Fig. 26: Identifying Accelerator Pedal Position (APP) Sensor Harness Connector Terminals
Courtesy of AUDI OF AMERICA, INC.

DTC P0230/16614: FUEL PUMP RELAY (J17) - ELECTRICAL CIRCUIT MALFUNCTION

Test Requirements

Ensure all fuses are okay, battery voltage is at least 11.5 volts. Ensure all electrical accessories are off and A/C
is off.

Test Procedure

1. Using DVOM, check power supply and ground to Fuel Pump Relay. See Fig. 27 . See ENGINE

PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

2. Check resistance of Fuel Pump Relay wiring. Resistance should be a maximum of 1.5 ohms for each

reading. Check Fuel Pump Relay wiring for short circuits to one another, and for short circuits to B+ and
ground. See Fig. 27 .

3. If resistance, voltage and ground supply are okay and no short circuits are present, replace faulty Fuel

Pump Relay (J17). If resistance and/or voltage or ground supply are not okay or a short circuit is present,
repair as necessary. Erase DTC memory. Test is complete. Perform ECM relearn procedure. See TEST
DRIVE RELEARN PROCEDURE .

NOTE:

Relay panel is behind trim panel, under driver's side of dash.

2003 Volkswagen New Beetle GLS

2001-2003 ENGINE PERFORMANCE Self-Diagnostics - 2.0L - Beetle, Golf & Jetta (Engine Codes AVH & AZG)

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Wednesday, December 14, 2005 8:49:56 AM

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