Camshaft Position (CMP) Sensor, Checking
Camshaft Position (CMP) Sensor, Checking
NOTE: Use only gold-plated terminals when servicing terminals in harness connector of sensors.
Recommended special tools and equipment
- VAG1526 multimeter or VAG1715 multimeter
- VAG1594 connector test kit
- Wiring diagram
Test requirements
- Fuses in E-box (plenum chamber, left) must be OK:
- Battery voltage must be at least 11.5 volts.
- All electrical consumers such as, for example, lights and rear window defroster must be switched off.
- Parking brake must be engaged or else daylight driving lights will be switched on.
- For vehicles with automatic transmission, selector lever must be in - P -.
- If vehicle is equipped with an A/C system, it must be switched off.
- Ground (GND) connections between engine and chassis must be OK.
- Ignition switched off.
Test sequence
Cylinder bank 1
- Disconnect the 3-pin connectors from Camshaft Position (CMP) Sensor - G40 - (arrow).
Cylinder bank 2
- Disconnect the 3-pin connectors from Camshaft Position (CMP) Sensor 2 - G163 - (arrow).
Cylinder bank 1 and 2
NOTE:
- Cylinder bank 1 = in direction of travel, right.
- Cylinder bank 2 = in driving direction, left.
- Before disconnecting harness connectors, mark allocation to component.
Checking voltage supply
- Connect multimeter between terminal 1 (B+) and 3 (Ground -GND-) for voltage measurement for the respective connector for hall sensor.
- Switch ignition on.
Specified value: at least 4.5 V.
- Switch ignition off.
If there is no voltage:
- Check wires according to wiring diagram.
Checking wiring
- Connect test box to control module wiring harness. Connecting Test Box For Wiring Test
- Check wires between test box and 3-pin connector for open circuit according to wiring diagram.
Wire resistance: max. 1.5 ohms.
Cylinder bank 1
Cylinder bank 2
Cylinder bank 1 and 2
- Also check wires for short circuit to each other.
Specified value: infinity ohms.
- Erase DTC memory of Engine Control Module (ECM). Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes
If no malfunctions are found in the wires and there was voltage between terminals 1 + 3:
- Replace the respective Camshaft Position (CMP) sensor:
Cylinder bank 1
- Camshaft Position (CMP) Sensor - G40 -.
Cylinder bank 2
- Camshaft Position (CMP) Sensor 2 - G163 -.
- Erase DTC memory of Engine Control Module (ECM). Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes
If no errors are found in wires and there was no voltage between terminals 1 + 3:
- Replace Engine Control Module (ECM).