With Manufacturer's Scan Tool

Oxygen Sensor Heating (After Three Way Catalyst), Checking

Special tools, workshop equipment, testers, measuring instruments and auxiliary items required
- VAG 1551/1552 Scan Tool using VAG 1551/3 Adaptor cable
- VAG 1598/22 Test Box
- Fluke 83 multimeter
- VW 1594 Adaptor kit
- Wiring diagram

Requirements







- Fuse 43 must be OK
- Battery Voltage must be 11.5 Volts minimum
- Fuel pump relay must be OK
- Engine Coolant Temperature must be 85 °C minimum See Display group 04, Display field 3

Test sequence
- Connect VAG 1551/1552 Scan Tool. Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks" Testing and Inspection
- Start engine and let idle.
- Press 0 and 1 buttons to select "Engine Electronics" address word 01.

Indicated on display (example only)


06A906018AB Motronic M5.9.2 HS V06 ->
Coding 00000 WSC 00000


- Press -> button.

Indicated on display


Rapid data transfer HELP
Select function XX


- Press 0 and 8 buttons to select "Read Measuring Value Block" function 08.
- Press Q button to enter input.

Indicated on display


Read measuring value block
Input Display group number XXX


- Press 0, 4 and 1 buttons to select "Display group 41."
- Press Q button to enter input.

Indicated on display (1 to 4 = Display fields)


Read measuring value block 41 ->
1 2 3 4


- Check resistance value in Display field 3 for Oxygen sensor heater before Three Way Catalyst.







If specification obtained
- Press -> button.
- Press 0 and 6 buttons to select "End output" function 06.
- Press Q button to enter input.
- Switch OFF ignition.

If specifications not obtained
- Switch OFF ignition.







- Remove protective cover (arrows) and disconnect brown 4-pin harness connector to Oxygen sensor before Three Way Catalyst G130.







- Check sensor heating for continuity at Oxygen sensor connector terminals 1 and 2.

If it is determined that sensor heater has an open circuit
- Replace Oxygen sensor G130.
- Display the Readiness code. Refer to "Monitors, Trips and/or Drive Cycle (Readiness Codes)/Displaying Readiness Code", Testing and Inspection
- If DTC memory was erased or if the ECM was disconnected from Battery + , set the Readiness code. Refer to "Monitors, Trips and/or Drive Cycle (Readiness Codes)/Setting Readiness Code", Testing and Inspection

If sensor heater has continuity
- Switch Fluke 83 multimeter to Voltage range.







- Set multimeter to measure Voltage and connect to terminals 1 and 2 on connector to Control Module.
- Start engine and let idle.
- Measure Voltage supply and note Display group 41, Display field 4.

Display Heater after Three Way Catalyst ON
- Specification: 11.0 to 14.5 Volts.

Display Heater: after Three Way Catalyst ON/Heating after Three Way Catalyst OFF (alternating):
- Specification: Between 0.0 to 12.0 Volts fluctuating
- Switch OFF ignition.

If no Voltage present







- Connect VAG 1598/22 Test Box to ECM harness connector.







- Check wiring for open circuit between Test Box and 4-pin harness connector using Wiring diagram.
- Terminal 2 + socket 28, resistance 1.5 Ohms maximum

If specification obtained
- Check wiring from terminal 1 to fuel pump relay J17 using Wiring diagram.

- Display the Readiness code. Refer to "Monitors, Trips and/or Drive Cycle (Readiness Codes)/Displaying Readiness Code", Testing and Inspection
- If DTC memory was erased or if the ECM was disconnected from Battery + , set the Readiness code. Refer to "Monitors, Trips and/or Drive Cycle (Readiness Codes)/Setting Readiness Code", Testing and Inspection

If wiring OK:
- Replace Engine Control Module.