Camshaft Position Sensor, Checking

Special tools and workshop equipment required 

• Multimeter VAG 1526 or Multimeter VAG 1715
• Connector test kit VAG 1594
• Wiring diagram

Test requirements 

• Fuses in E-box (plenum chamber, left) must be OK: Refer to appropriate SYSTEMS WIRING DIAGRAM
  Fig 1: Identifying Fuses In E-Box (Plenum Chamber, Left)

  Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
• Battery voltage must be at least 11.5 volts.
• All electrical consumers such as, 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 

-- Disconnect 3-pin connectors from Camshaft Position (CMP) sensors:

1. Camshaft Position (CMP) Sensor 1 -G40- intake camshaft
2. Camshaft Position (CMP) Sensor 2 -G163- exhaust camshaft

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 to Engine Control Module (ECM) according to wiring diagram.

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 Ω

Component	Connector	Test box
Camshaft Position (CMP) Sensor 1 -G40-	Terminal 1	Socket 98
	Terminal 2	Socket 86
	Terminal 3	Socket 108
Camshaft Position (CMP) Sensor 2 -G163-	Terminal 1	Socket 98
	Terminal 2	Socket 87
	Terminal 3	Socket 108

-- Check wires for short circuit to each other.

Specified value: ∞ Ω

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

-- Generate readiness code.

If no malfunctions are found in the wires and there was voltage between terminals 1 + 3:

-- Replace the respective Camshaft Position (CMP) sensor:

• Camshaft Position (CMP) Sensor -G40-,
• Camshaft Position (CMP) Sensor 2 -G163-.

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

-- Generate readiness code.

If no errors are found in wires and there was no voltage between terminals 1 + 3:

-- Replace Motronic Engine Control Module (ECM) -J220- ENGINE CONTROL MODULE, REPLACING .

Final Procedures 

After the repair work, the following work steps must be performed in the following sequence:

1. Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY .
2. If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
3. If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .