With Generic Scan Tool

Check Camshaft Position (CMP) Sensor

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.
- Battery voltage must be at least 11.5 volts.
- All electrical consumers like, for example, lights and rear window heating 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.

Test sequence (Vehicles with engine code AFP)







- Disconnect the 3-pin connector from Camshaft Position (CMP) Sensor-G40- (arrow).







- Connect multimeter to terminal 1 (B+) and 3 (Ground -GND-) of 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:
- Connect test box to control module wiring harness, connect test box for wiring test.
Test Box, Connecting For Wiring Test







- Check for open circuits in wires between test box and connector according to wiring diagram.
Terminal 1 + socket 98
Terminal 2 + socket 86
Terminal 3 + socket 108

Wire resistance: max: 1.5 Ohms

- Also check wires for short circuit to each other.
Specified value: Infinity Ohms

If no malfunctions are found in the wires and there was voltage between terminals 1 + 3:
- Replace Camshaft Position (CMP) Sensor -G40-, item2.
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data.
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).

Test sequence (Vehicles with engine code BDF)







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

NOTE: Before disconnecting harness connectors, mark allocation to component.







- 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:
- Connect test box to control module wiring harness, connect test box for wiring test. Test Box, Connecting 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







- Also check wires for short circuit to each other.
Specified value: Infinity Ohms

If no malfunctions are found in the wires and there was voltage between terminals 1 + 3:
- Replace the respective hall sensor:
- Camshaft Position (CMP) Sensor -G40-, item 16 ,
- Camshaft Position (CMP) Sensor 2 -G163-, item 13 .

- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data.
Clearing Diagnostic Trouble Codes

- 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).