Oxygen Sensor Heating Test: After Converter

Special Tools, Testers And Auxiliary Items
- VAG 1551/1552 Scan Tool With VAG 1551/3 Adapter Cable
- VAG 1598/18 Test Box
- Multimeter (Fluke 83 Or Equivalent)
- Connector Test Kit VW 1594
- Wiring Diagram

Test Conditions
- Fuse 180K

Test Sequence
- Engine running at idle
- Connect VAG 1551/1552 scan tool and select "Engine Electronics" address word 01.

Indicated on display

Rapid data transfer HELP
Select function XX

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

Indicated on display

Read Measuring Value Block HELP
Input display group number XXX

- Press buttons -1-, -2- and -1- to input display group 121 and press -Q- button to confirm input.

Indicated On Display (1-4 Display Fields)

Read Measuring Value Block 121-->
1 2 3 4




Display Group 121: Display Fields 1-4

- Check resistance value for O2S heating (after three way catalytic converter) (display field 3):
- Press -> button.
- Press buttons -0- and -6- to select "End Output" function 06 and press -Q- button to confirm input.
- Switch ignition off.




Relevance Of Values In 8-digit Number Block.

Continuation




- Separate 4-pin connector -2- (brown) to HO2S 2 -G 108- (after three way catalytic converter).




- Connect multimeter with test leads from VW 1594 to measure resistance at terminals 1 and 2 on connector to HO2S 2.
- Measure the resistance value.
Specification: 0.00-24.2 ohms

If The Specification Is Not Obtained:
- Replace HO2S 2 -G108- (after three way catalytic converter).

If The Specification Is Attained:
- Check relevance table, for value of O2S control status, display group 121, display field 4, 1st position from left.
- Set multimeter voltage measurement range.





- Connect multimeter with test leads from VW 1594 to measure voltage between terminals 1 and 2 (ECM side of harness connector).
- Measure the voltage supply.
When display = 1: Specification Is 11.0-14.5 Volts
When display = alternately 0 and 1:Specification Is Fluctuating Between 0.0-12.0 Volts

IF No Voltage Is Present:




- Connect multimeter using test leads from VW 1594 to measure voltage between terminal 1 (ECM side) and vehicle Ground.
Specification: 11.0-14.5 volts

If Again No Voltage Is Present:
- Check the wiring from terminal 1 to relay panel according to wiring diagram.

If Voltage Was Present:

- Check relevance table, for value of O2S control status, display group 121, display field 4, 1st position from left.




- Connect multimeter with test leads from VW 1594 between terminal 2 (ECM side of harness connector) and battery positive (B+).
- Measure the voltage supply.
When display = 1: Specification is 1.0-14.5 Volts
When display = alternately 0 and 1:Specification is fluctuating between 0.0-12.0 volts
- Switch ignition off.

If The Specification Is Not Attained:




- Connect VAG 1598/18 test box to ECM wiring harness.





- Check wiring between test box and 4-pin connector for open circuit according to wiring diagram.
Terminal 2 and test box socket 66
Resistance: Maximum 1.5 ohms

If No Wiring Malfunction Is Detected:

- Replace Engine Control Module -J220-.
- Read the readiness code. If DTC memory has been erased, repair must be verified via appropriate display group, Readiness code, creating.