INTRODUCTION
Note. Information in this article applies to gasoline engine models only.
Sensor operating range information can help determine if a sensor is out of calibration. An out-of-calibration sensor may not set a trouble code, but it may cause driveability problems.
Note. Unless stated otherwise in test procedure, perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance.
Scheme 1
Scheme 2
Note. Not all vehicles have all sensors listed.
SENSOR OPERATING SPECIFICATIONS
| Application & Conditions | Ohms |
|---|
| Cabriolet & Fox |
| Ignition On (1) | 500-1000 |
| Move Sensor Flap (2) | Changing |
| Corrado |
| Ignition On (3) | 500-1000 |
| Move Sensor Flap (4) | Changing |
| Golf GL & Jetta |
| Ignition On (1) | 500-1000 |
| Move Sensor Flap (2) | Changing |
| GTI, Jetta GLI & Passat |
| Sensor At Rest (5) | 4500-5500 |
| Sensor At Rest (6) | 3800-4200 |
| Vanagon |
| Sensor At Rest (7) | Less Than 1000 |
| Sensor At Rest (8) | More Than 4000 |
| (1) Measure resistance between terminals No. 6 and 17. (2) Measure resistance between terminals No. 17 and 21. (3) Measure resistance between terminals No. 15 and 28. (4) Measure resistance between terminals No. 13 and 15. (5) Measure resistance between terminals No. 23 and 26. (6) Measure resistance between terminals No. 26 and 35. (7) Measure resistance between terminals No. 14 and 17. (8) Measure resistance between terminals No. 17 and 18. |
| (1) | Measure resistance between terminals No. 6 and 17. |
| (2) | Measure resistance between terminals No. 17 and 21. |
| (3) | Measure resistance between terminals No. 15 and 28. |
| (4) | Measure resistance between terminals No. 13 and 15. |
| (5) | Measure resistance between terminals No. 23 and 26. |
| (6) | Measure resistance between terminals No. 26 and 35. |
| (7) | Measure resistance between terminals No. 14 and 17. |
| (8) | Measure resistance between terminals No. 17 and 18. |
AIRFLOW SENSOR POTENTIOMETER RESISTANCE TEST
| Application | Between Terminals | Ohms |
|---|
| 2.0L | No. 14 & 16 | 8-13 |
| Application | Temperature °F (°C) | Ohms |
|---|
| Cabriolet, Corrado & Golf GL (1) | 122 (50) | 800-1000 |
| " | 176 (80) | 250-350 |
| " | 212 (100) | 100-200 |
| Fox & Jetta (2) | 122 (50) | 800-1000 |
| " | 176 (80) | 250-350 |
| " | 212 (100) | 100-200 |
| Passat (3) | 122 (50) | 800-1000 |
| " | 176 (80) | 250-350 |
| " | 212 (100) | 100-200 |
| Vanagon (1) | 122 (50) | 800-1000 |
| " | 176 (80) | 250-350 |
| " | 212 (100) | 100-200 |
| (1) Measure resistance between terminals No. 6 and 10. (2) Measure resistance between terminals No. 11 and 28. (3) Measure resistance between terminals No. 3 and 35. |
| (1) | Measure resistance between terminals No. 6 and 10. |
| (2) | Measure resistance between terminals No. 11 and 28. |
| (3) | Measure resistance between terminals No. 3 and 35. |
COOLANT TEMPERATURE SENSOR RESISTANCE TEST
| Temperature °F (°C) | Ohms |
|---|
| 68 (20) | 2100-2900 |
| 176 (80) | 270-390 |
| (1) Measure resistance between terminal No. 13 and ground. |
| (1) | Measure resistance between terminal No. 13 and ground. |
CYLINDER HEAD TEMP. SENSOR RESISTANCE TEST (VANAGON) (1)
| Application | Between Terminals | Ohms |
|---|
| 1.8L | No. 10 & 12 | 17.5-21.5 |
| 2.0L | No. 4 & 5 | 15-20 |
DIFFERENTIAL PRESSURE REGULATOR TEST
| Temperature °F (°C) | Ohms |
|---|
| 122 (50) | 500,000-600,000 |
| 257 (125) | 35,000-40,000 |
| 392 (200) | 4500-6500 |
| (1) Measure resistance between terminals No. 9 & 35. |
| (1) | Measure resistance between terminals No. 9 & 35. |
EGR TEMP. SENSOR RESISTANCE TEST (2.0L) (1)
| Application | Temperature °F (°C) | Ohms |
|---|
| Cabriolet & Corrado (1) | 32 (0) | 5000-6500 |
| " | 122 (50) | 950-1000 |
| " | 212 (100) | 150-250 |
| Fox, Golf & Jetta (1) | 32 (0) | 5000-6500 |
| " | 122 (50) | 950-1000 |
| " | 212 (100) | 150-250 |
| Vanagon (2) | 68 (20) | 2300-2700 |
| (1) On Cabriolet and Corrado (California), measure resistance between terminals No. 28 and 30. On all others, measure resistance between terminals No. 6 and 9. (2) Measure resistance between terminals No. 6 and 14. |
| (1) | On Cabriolet and Corrado (California), measure resistance between terminals No. 28 and 30. On all others, measure resistance between terminals No. 6 and 9. |
| (2) | Measure resistance between terminals No. 6 and 14. |
INTAKE AIR TEMPERATURE SENSOR RESISTANCE TEST
| Temperature °F (°C) | Ohms |
|---|
| 14 (10) | 7000-11,600 |
| 68 (20) | 2100-3100 |
| 176 (80) | 270-390 |
| (1) Measure resistance between temp. sensor & ground. |
| (1) | Measure resistance between temp. sensor & ground. |
OIL TEMP. SENSOR RESISTANCE TEST (VANAGON) (1)
| Application | Condition | Ohms |
|---|
| Cabriolet, Fox & Golf GL |
| Federal (1) | Disconnect & Ground Harness Wire | 0.5 |
| " | Reconnect Sensor | Open Ckt |
| Calif. (2) | Disconnect & Ground Harness Wire | 1 |
| " | Reconnect Sensor | Open Ckt |
| Corrado (3) | Disconnect Sensor | 1.5 |
| " | Reconnect Sensor | Open Ckt |
| GTI, Jetta GLI & Passat |
| Federal (4) | Disconnect Sensor & Ground GRN Wire | 0 |
| " | Reconnect Sensor | Open Ckt |
| Calif. (5) | Disconnect & Ground Harness Wire | 1 |
| " | Reconnect Sensor | Open Ckt |
| Vanagon (6) | Disconnect & Ground Harness Wire | 0 |
| " | Reconnect Sensor | Open Ckt |
| (1) Measure resistance between terminals No. 2 and 13. (2) Measure resistance between terminals No. 2 and 8. (3) Measure resistance between terminals No. 1 and 2. (4) Measure resistance between terminals No. 7 and 35. (5) Measure resistance between terminals No. 2 and 8. (6) Measure resistance between terminals No. 5 and 7. |
| (1) | Measure resistance between terminals No. 2 and 13. |
| (2) | Measure resistance between terminals No. 2 and 8. |
| (3) | Measure resistance between terminals No. 1 and 2. |
| (4) | Measure resistance between terminals No. 7 and 35. |
| (5) | Measure resistance between terminals No. 2 and 8. |
| (6) | Measure resistance between terminals No. 5 and 7. |
OXYGEN SENSOR RESISTANCE TEST
| Application | Position | Ohms |
|---|
| Except Corrado (1) | Disconnect Potentiometer | 1.5 |
| Corrado (2) | Throttle Closed | 0.5 |
| " | Off Full Throttle | Open Circuit |
| " | Full Throttle | 0.5 |
| (1) Measure resistance between terminals No. 1 and 34. (2) Measure resistance between terminals No. 6 and 11. |
| (1) | Measure resistance between terminals No. 1 and 34. |
| (2) | Measure resistance between terminals No. 6 and 11. |
THROTTLE POSITION SENSOR RESISTANCE TEST
| Condition | Ohms |
|---|
| Move Sensor Plate | Changing |
| (1) Measure resistance between terminals No. 15 & 19. |
| (1) | Measure resistance between terminals No. 15 & 19. |
VACUUM SENSOR RESISTANCE TEST (1)
