Test sequence

NOTE: The engine speed (RPM) sensor detects RPM and reference marks. The engine cannot be started without a signal from the engine speed (RPM) sensor -G28-. If the engine speed (RPM) sensor -G28- signal fails while the engine is running, the engine will stop immediately.

Before performing test, check sensor for proper installation and proper fit.
Disconnect harness connector for engine speed (RPM) sensor (identification: gray harness connector).

Fig 1: Identifying Engine Speed (RPM) Sensor 3-Pin Connector Terminals
Connect multimeter between terminal 2 and 3 for resistance measurement.
- Specification: 730 to 1000 Ω

NOTE: Resistance value of the engine speed (RPM) sensor is based on a temperature of 20 ° C. Resistance increases as temperature increases.

If specified value is not obtained:

Replace engine speed (RPM) sensor.

If specified value is obtained:

Fig 2: Identifying Engine Speed (RPM) Sensor 3-Pin Connector Terminals

Connect multimeter to terminals 2 and 1 (shielding) and to terminals 3 and 1 (shielding) for resistance measurement.
- Specification: INFINITY Ω each (no continuity)

If specified value is not obtained:

Replace engine speed (RPM) sensor.

If specified value is obtained:

Connect VAG1598/31 test box at wiring harness to ECM; do not connect ECM. See WIRE AND COMPONENT TEST USING VAG1598/31 TEST BOX .

Fig 3: Identifying Engine Speed (RPM) Sensor 3-Pin Harness Connector Terminals

Check following wire connections for open circuit and short circuit to Ground (GND) and B+:

ENGINE SPEED (RPM) SENSOR CIRCUIT TEST

Harness connector Terminal	VAG1598/31 test box Socket
1 (shielding)	108
2 (Ground -GND-)	90
3 (signal)	82

Repair open circuit or short circuit if necessary.

If no malfunctions are found in wires:

Replace Engine Control Module (ECM). See ENGINE CONTROL MODULE (ECM) (WITHOUT METAL ANTI-THEFT HOUSING), REPLACING .