Passat Syncro Wagon V6-2771cc 2.8L DOHC (AHA) (1998)
-
Check wiring for open circuit between ECM/test box and 4-pin HO2S harness connector (to ECM).
-
Connector terminal 2 to ECM/test box socket 27
-
Specified value: max. 1.5 Ohms
-
Check wiring at HO2S harness connector terminals 3 and 4 for short circuit to terminals 1 and 2 using wiring diagram.
Specified value: Infinity Ohms
If the specification is attained:
-
Check wiring between terminal 1 and fuel pump relay -J17- using appropriate wiring diagram.
-
Check readiness code. If Diagnostic Trouble Code (DTC) memory has been erased, or ECM was disconnected, generate new readiness code.
See: Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes
If wiring is OK:
-
Replace Motronic ECM -J220-. See: Engine Control Module/Service and Repair
With Generic Scan Tool
Oxygen sensor heater for oxygen sensors behind Three Way Catalytic Converter (TWC), checking
NOTE: When servicing terminals in harness connector of Heated Oxygen Sensor (HO2S), use only goldplated terminals.
Recommended special tools and equipment
-
V.A.G 1526 multimeter or V.A.G 1715 multimeter
-
V.A.G 1594 Connector test set
-
Wiring diagram
Test requirements
-
The respective fuses of Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130- and Oxygen Sensor (O2S) 2 Behind Three
Way Catalytic Converter (TWC) -G131- must be OK:
-
Ignition switched off.
Test sequence
-
Disconnect 4-pin harness connector to the respective oxygen sensor: