Camshaft Position Sensor: Testing and Inspection

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







The respective fuses of Motronic Engine Control Module (ECM) -J220- must be OK.







- Fuses -1, 2, 3, 4 and 7- in protective housing (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.
- Ground (GND) connections between engine and chassis must be OK.
- Ignition switched off.

Test sequence

Cylinder bank 1







- Disconnect 3-pin connectors from Camshaft Position (CMP) sensors:
1 Camshaft Position (CMP) Sensor -G40- intake camshaft
4 Camshaft Position (CMP) Sensor 2 -G163- exhaust camshaft

Cylinder bank 2







- Disconnect 3-pin connectors from Camshaft Position (CMP) sensors:
1 Camshaft Position (CMP) Sensor 4 -G301- exhaust camshaft
4 Camshaft Position (CMP) Sensor 3 -G300- intake camshaft

Cylinder bank 1 and 2


NOTE:
- Cylinder bank 1 = in driving direction, right
- Cylinder bank 2 = in driving direction, left
- Before disconnecting harness connectors, mark allocation to component.


Checking voltage supply







- Connect multimeter to terminal 1 (B+) and 3 (Ground -GND-) of the respective connector for Camshaft Position (CMP) sensor for voltage measurement.
- Switch ignition on.
Specified value: at least 4.5 V

- Switch ignition off.

If there is no voltage:

Checking wiring

- Connect test box to control module wiring harness, connect 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 1:

Cylinder bank 2

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 4: Reset/erase diagnostic data.
- 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 sensor (Camshaft Position (CMP) Sensor -G40-, Camshaft Position (CMP) Sensor 2 -G163-, Camshaft Position (CMP) Sensor 3 -G300- or Camshaft Position (CMP) Sensor 4 -G301-), item 3 .
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data.
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes

If no malfunctions are found in wires and there was no voltage between terminals 1 + 3:
- Replace Engine Control Module (ECM).