Testing If Display Approx. 140° C

-- Disconnect the MAF / IAT sensor -G70 / G42- electrical harness connector. -1-

Fig 1: Identifying Mass Air Flow (MAF) Sensor G70 Electrical Harness Connector

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Check the value indicated on the scan tool display.

If indication jumps to approx. -40° C or -46° C:

-- Switch ignition off.

-- Replace the MAF / IAT sensor -G70 / G42- Refer to the Repair Instructions.

If the indication remains at approx. 140° C

If the manufacturers test box is being used, perform the following step.

-- Install the test box.

If the manufacturers test box is not being used, perform the following step.

-- Remove the Motronic Engine Control Module (ECM) -J623-. Refer to the Repair Instructions.

-- Disconnect the ECM harness.

-- Using a multimeter, check the MAF / IAT sensor -G70 / G42- electrical harness connector terminal 5 to engine ground.

Fig 2: Identifying 5-Pin Electrical Harness Connector & Terminals

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Specified value: OL or no continuity.

If the specified value was Not obtained:

-- Check the wiring for a short circuit to Ground (GND).

-- If necessary, repair the faulty wiring connection.

-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

If no malfunction is detected in the wiring and the sensor resistance was OK:

-- Replace the Motronic Engine Control Module (ECM) -J623-. Refer to the Repair Instructions.

Final procedures

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

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