Camshaft Position (CMP) sensor, checking: Notes
Special tools and equipment
- VAG1526 A
- VAG1527 B
- VAG1594 A
- VAG1598/31
- VAS5051 with VAS5051/1
Installation location. Refer to Component locations, overview
NOTE:
To gain access to the connectors on cylinder bank 2 (left), you must remove the cover on left of engine compartment, disconnect cable to coolant shortage indicator switch at bottom of expansion tank, remove screw (arrow) for coolant expansion tank and lay aside. Coolant hoses -1 to 3- do not have to be disconnected.
To gain access to the connectors on cylinder bank 2 (left), you must remove the cover on left of engine compartment, disconnect cable to coolant shortage indicator switch at bottom of expansion tank, remove screw (arrow) for coolant expansion tank and lay aside. Coolant hoses -1 to 3- do not have to be disconnected.
Checking actuation
Fig 3: Connecting Voltage Tester VAG1527 B With Measuring Probes And Plug-In Adapters From VAG1594 A Between Terminal 2 (CMP Sensor Signal) And Terminal 1 (Positive)
- Connect voltage tester VAG1527 B with measuring probes and plug-in adapters from VAG1594 A between terminal 2 (CMP sensor signal) and terminal 1 (positive); connector remains plugged in.
NOTE:
Receptacles are numbered accordingly on the back of the connector.
- Operate starter for a few seconds.
- LED should flash.
NOTE:
Voltage testers with a low current consumption continue to glow faintly between actuation from the engine control module (rather than extinguishing completely) and become much brighter when actuated.
If LED does not flash:
Checking power supply
Fig 4: Disconnecting Electrical Harness Connectors At Camshaft Position (CMP) Sensor -G40- And Camshaft Position (CMP) Sensor 3 -G300-
- Disconnect connectors -1- and -2- on Camshaft Position (CMP) sensor -G40- and Camshaft Position (CMP) sensor 3 -G300-.
Fig 5: Disconnecting Electrical Harness Connectors And At Camshaft Position (CMP) Sensor 2 -G163- And Camshaft Position (CMP) Sensor 4 -G301-
- Disconnect connectors -1- and -2- on Camshaft Position (CMP) sensor 2 -G163- and Camshaft Position (CMP) sensor 4 -G301-.
- Connect multimeter as follows to measure voltage:
| Connector Terminal |
Measure to |
| 1 | Engine Ground |
- Switch ignition on.
- Specified value: approx. 5 V
Checking signal wire
- Connect multimeter as follows to measure voltage:
| Connector Terminal |
Measure to |
| 2 | Engine ground |
- Switch ignition on.
- Specified value: approx. battery voltage
Checking ground wire
- Connect multimeter as follows to measure voltage:
| Connector Terminal |
Measure to |
| 3 | Battery positive |
- Specified value: approx. 10 V
- Repair any open/short circuit as necessary.
If the specified values are all achieved and the LED test light does not flash (measured between terminals 1 and 2 with starter connector attached),
- Install a new CMP sensor.
If the specified values are not obtained:
Checking wiring between CMP sensor and engine control module.
- Connect test box VAG1598/31 to wiring harness for engine control module; do not connect engine control module. Refer to Wiring and component check with test box VAG 1598/31 .
- Check for open circuit and short to positive or ground in following wiring connections:
- Camshaft Position (CMP) sensor -G40- (Bank 1)
| Connector Terminal |
Test box VAG1598/31 Socket |
| 1 (positive) | 98 |
| 2 (signal) | 87 |
| 3 (ground) | 108 |
- Camshaft Position (CMP) sensor 2 -G163- (Bank 2)
| Connector Terminal |
Test box VAG1598/31 Socket |
| 1 (positive) | 98 |
| 2 (signal) | 86 |
| 3 (ground) | 108 |
- Camshaft Position (CMP) sensor 3 -G300- (Bank 1)
| Connector Terminal |
Test box VAG 1598/31 Socket |
| 1 (positive) | 98 |
| 2 (signal) | 81 |
| 3 (ground) | 108 |
- Camshaft Position (CMP) sensor 4 -G301- (Bank 2)
| Connector Terminal |
Test box VAG 1598/31 Socket |
| 1 (positive) | 98 |
| 2 (signal) | 54 |
| 3 (ground) | 108 |
- Repair any open/short circuit as necessary.