Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

SYS.OK|MANUAL.DB● LIVE

HOMESERVICE MANUALSAUDI2001A6 AVANT QUATTROREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMIGNITION SYSTEM - 2.8L V6 ATQIGNITION SYSTEMIGNITION SYSTEM, CHECKINGENGINE SPEED (RPM) SENSOR -G28-, CHECKINGTEST SEQUENCE

2001 Audi A6 Avant Quattro

Test sequence

2001 Audi A6 Avant QuattroSECTION 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 .

RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready Tools Free Quote Check Quote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.