Volkswagen New Beetle. Manual - part 1813

 

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Volkswagen New Beetle. Manual - part 1813

 

 

IAT SENSOR RESISTANCE 

Temperature °F (°C) 

Ohms 

86 (30) 

1500-2000 

104 (40) 

1000-1500 

122 (50) 

800-1000 

140 (60) 

500-700 

158 (70) 

375-500 

176 (80) 

275-375 

194 (90) 

225-275 

 

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 8:49:55 AM

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© 2004 Mitchell Repair Information Company, LLC. 

Fig. 17: Testing IAT Sensor (G42) (Beetle, Golf & Jetta - 2.0L) 
Courtesy of VOLKSWAGEN UNITED STATES, INC.

 

2003 Volkswagen New Beetle GLS 

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

  

Helpmelearn Repair Manuals 

 

Wednesday, December 14, 2005 8:49:55 AM

Page 53 

© 2004 Mitchell Repair Information Company, LLC. 

Fig. 18: Identifying Mass Airflow Sensor (G70) & IAT Sensor (G42) Harness Connector Terminals 
Courtesy of AUDI OF AMERICA, INC. 

DTC P0121/16505, P0122/16506 & P0123/16507: ANGLE SENSOR 2 

Code Definition 

DTC P0121/16505 
Angle Sensor 2 (G188) For Throttle Valve Drive - Implausible Signal 

DTC P0122/16506 
Angle Sensor 2 (G188) For Throttle Valve Drive - Signal Too Low 

DTC P0123/16507 
Angle Sensor 2 (G188) For Throttle Valve Drive - Signal Too High 

NOTE:

If a test ends with ECM replacement, before replacing ECM be certain that, all 
wiring, power and ground supplies are okay. See ENGINE PERFORMANCE in 
SYSTEM WIRING DIAGRAMS article in ELECTRICAL and ECM GROUND & 
VOLTAGE SUPPLY . 

 

2003 Volkswagen New Beetle GLS 

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

  

Helpmelearn Repair Manuals 

 

Wednesday, December 14, 2005 8:49:55 AM

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© 2004 Mitchell Repair Information Company, LLC. 

Circuit/Component Description 

Throttle Valve Control Module (TVCM - J338) is located on throttle body. Throttle valve drive angle sensors 
and are located in TVCM (J338). ECM monitors throttle valve drive angle sensors for throttle valve position. 
ECM calculates throttle position based on percentage values sent by throttle valve drive angle sensors. Throttle 
valve drive angle sensors run in opposite directions of each other. Throttle Valve Drive Angle sensor No. 1 
(G187) displays throttle positions from 3-93 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). 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. Turn ignition off. Disconnect TVCM (J338) 6-pin harness connector. Using DVOM check resistance 

between terminals No. 3 and 5 on TVCM. See Fig. 19 . Specification is one to 5 ohms.  

2. 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 
.  

3.  

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) 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.  

4. 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). 

NOTE:

Test ranges for throttle valve drive angle sensors may not fully display on scan 
tool. 

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 

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

  

Helpmelearn Repair Manuals 

 

Wednesday, December 14, 2005 8:49:55 AM

Page 55 

© 2004 Mitchell Repair Information Company, LLC. 

 

 

 

 

 

 

 

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