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Heater Check




Oxygen Sensor (O2S) Heating For Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130-, Checking

NOTE:
- The vehicle must be raised to gain access to the Oxygen Sensor (O2S) connector.
- Only gold plated terminals may be used when servicing Oxygen Sensor (O2S) connector terminals 3 and 4.

Special tools, workshop equipment, testers, measuring instruments and auxiliary items required







- VAG 1551 Scan tool (or VAG 1552) with VAG 1551/3 adapter cable

NOTE: All functions which could previously be performed with VAG 1551/1552 can also be performed with the VAS 5051.

- VAG 1526 Hand multimeter or VAG 1715 multimeter
- VAG 1594 Adapter set
- VAG 1598/31 Test box
- Electrical Wiring Diagrams

Test prerequisites







- The fuses must be OK.
- The battery voltage must be at least 11.5 V.
- All electrical accessories, e.g. lights and rear window heating must be switched off.
- If the vehicle is equipped with air conditioning, this must be switched off.
- Selector lever must be in position "P" or "N" on vehicles with an automatic transmission.
- Fuel Pump (FP) relay -J17- must be OK., checking:

Test sequence
- Connect VAG 1551 Scan tool (or VAG 1552) and select engine electronics control module with the "Address word" 01. When doing this the engine must be running at idle speed: ((VAG 1551 and Motronic Engine Control Module (ECM) -J220-, connecting and selecting).
[1][2][3]Connecting VAG 1551 Scan Tool

Indicated on display:


Rapid data transfer HELP
Select function XX


- Press buttons -0- and -8- for function "Read measured value (data) block" and confirm entry with -Q- button.

Indicated on display:


Read measured value block
Input display group number XXX


- Press buttons -0-, -4- and -1- for "Display group number 41" and confirm entry with -Q- button.

Indicated on display: (1 to 4 = display zones)


Read measured value block 41 ->
1 2 3 4


- Check the status of the Oxygen Sensor (O2S) heating in display zone 4: Display: Htg.aC.ON / Htg.aC.OFF (alternating)

NOTE: The Oxygen Sensor (O2S) heating may be switched on or off depending on the operating conditions of the engine, therefore the display in display zone 4 may show "Htg.aC.ON" or alternating from "Htg.aC.ON" to "Htg.aC.OFF".

- Press the -> button.
- Press buttons -0- and -6- for function "End output" and confirm entry with the -Q- button.
- Switch off ignition.

If the display does not indicate as described:







- Remove protective cover -arrows-and disconnect 4-pin connector (black) -1- to Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130-.

Checking resistance







If the specification is not obtained:
- Check sensor heater wire resistance at connector terminals 1 and 2 to Oxygen Sensor (O2S).
- Specification: 6,4 to 47,5 ohms(at room temperature).
- Replace Oxygen Sensor (O2S) 2, Bank 1 after Three Way Catalytic Converter (TWC) -G130-, item 18.
- Check DTC memory, repair malfunctions if necessary and then erase DTC memory.
Reading Diagnostic Trouble Codes

- Erase learned values and adapt Motronic Engine Control Module (ECM) -J220- again.
- Read readiness code. If the DTC memory has been erased or the Motronic Engine Control Module (ECM) -J220- was disconnected from battery positive (B+), the readiness code must be generated again.
Monitors, Trips, Drive Cycles and Readiness Codes
Monitors, Trips, Drive Cycles and Readiness Codes

If the specification is obtained:

Checking voltage supply







- Connect multimeter to measure voltage at terminals 1 and 2 (connector to Motronic Engine Control Module (ECM) -J220-) using adapter cables from VAG 1594.
- Start engine and run at idle speed.
- Measure voltage supply and observe display group 41, display zone 4.
- Display Htg.aC.ON: Specification: 11.0 to 14.5 V
Display Htg.aC.ON / Htg.aC.OFF (alternating): Specification: Between 0.0 to 12.0 V fluctuating
- Switch off ignition.

If no voltage is present:

- Remove wiper arms and cowl panel:







- Connect VAG 1598/31 test box to control module wiring harness. The Motronic Engine Control Module (ECM) -J220- remains disconnected.







- Check wiring for open circuit between test box and 4-pin connector referring to Electrical Wiring Diagrams.
Terminal 2 and socket 63
Wire resistance: max. 1.5 ohms

If the specification is obtained:
- Check wire for open circuit between 4-pin connector terminal 1 and Fuel Pump (FP) relay -J17- referring to Electrical Wiring Diagrams.
Wire resistance: max. 1.5 ohms

If no wiring malfunction is detected:
- Replace Motronic Engine Control Module (ECM) -J220-.
- Check DTC memory, repair malfunctions if necessary and then erase DTC memory.
Reading Diagnostic Trouble Codes

- Erase learned values and adapt Motronic Engine Control Module (ECM) -J220- again.
- Read readiness code. If the DTC memory has been erased or the Motronic Engine Control Module (ECM) -J220- was disconnected from battery positive (B+), the readiness code must be generated again.
Monitors, Trips, Drive Cycles and Readiness Codes
Monitors, Trips, Drive Cycles and Readiness Codes
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