Passat Wagon 4Motion V6-2.8L (ATQ) (2003)
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Perform a road test.
The following operating conditions must be obtained during road test:
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Coolant temperature must rise to above 80°C.
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Once the temperature is reached, the following conditions
idle
Partial throttle
Wide Open Throttle (WOT)
Deceleration mode must be reached several times each.
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Engine speed must be increased to above 3500 RPM during Wide Open Throttle (WOT).
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Check control module's DTC memory again.
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Test operating conditions of engine. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests and
General Diagnostics/Engine Operating Conditions, Checking
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Repeat idle test.
If expected values are still not obtained:
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Test throttle valve control module. See: Powertrain Management/Computers and Control Systems/Electronic Throttle Control Module/Testing and
Inspection
If no DTC can be found here:
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Test Heated Oxygen Sensors (HO2S) and oxygen sensor control. Refer to Oxygen Sensor Before Catalyst, Checking/Sensors and Control Check
See: Powertrain Management/Computers and Control Systems/Oxygen Sensor/Testing and Inspection
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Check intake system for unmetered air. See: Powertrain Management/Fuel Delivery and Air Induction/Testing and Inspection