Passat Wagon L4-1781cc 1.8L Turbo (AEB) (1998)
Display, Htg. aC.ON/Htg.aC.OFF (alternating)
Specification: Between 0.0 and 12.0 Volts, fluctuating
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Switch OFF ignition.
If NO Voltage present:
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Connect VAG 1598/22 Test Box to Control Module harness connector.
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Check wiring for open circuit between Test Box and 4-pin harness connector using Wiring diagram.
Terminal 2 + socket 28
Wire resistance: Max. 1.5 Ohms
If specification obtained
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Check wiring between terminal 1 and fuel pump relay J17 using Wiring diagram.
If wiring OK
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Replace engine electronics Control Module.
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Display Readiness Code, See: Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes
NOTE: If DTC memory has been erased or the Engine Control Module was disconnected from its Voltage supply, the Readiness Code must be created
again , See: Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes
O2 sensor/O2 sensor control After Three Way Catalyst, checking
Oxygen sensor and Oxygen sensor control (after Three Way Catalyst), checking