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Home >> Volkswagen >> 2010 >> Touareg Base >> Repair and Diagnosis >> Engine Performance >> Ignition System >> 3.6L - Generic Scan Tool - Engine Code(S): BHK >> St Generic Scan Tool >> Diagnosis And Testing >> Diagnostic Procedures >> IAT In MAF Sensor, Checking >> Testing If Display Approx. - 40° C To - 46° C
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Testing If Display Approx. - 40° C To - 46° C

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

-- Switch ignition ON.

-- Using a jumper wire, connect the MAF / IAT sensor -G70 / G42- electrical harness connector terminals 3 to 4.

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

-- Switch ignition OFF.

If indication increased to approx. 140 °C:

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

If indication remains at approx. -40 °C or -46 °C:

Checking wiring 

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 Engine Control Module (ECM) -J623-. Refer to the Repair Information.

-- Disconnect the ECM harness.

-- Using a multimeter, check the MAP / IAT sensor -G70 / G42- electrical harness connector terminal 3 to the Engine Control Module (ECM) -J623- electrical harness connector T94 terminal 13 for an open circuit or a short to voltage, refer to the wiring diagram.

Specified values: Circuit continuity; 1.5 Ω max; Circuit voltage = 0 volts when disconnected from ECM (with ignition on).

If the specified value was Not obtained:

-- Check the wiring for an open, high resistance or short circuit to Battery (+)

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

-- If necessary, repair the faulty wiring connection.

If the specified value was obtained:

-- Using a multimeter, check terminal 4 of the MAF / IAT sensor to engine ground.

Specified value: 1.5 Ω Max

If the specified value was Not obtained:

-- Check the wiring for an open circuit or high resistance.

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

-- If necessary, repair the faulty wiring connection.

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

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

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