Signal Too High

Signal too high

Checking for air leakage in the exhaust system
Check for air leakage. See Checking for air leakage in the exhaust system Air Leakage Exhaust System, Check.
Remedy as necessary.





Was there any air leakage?

Yes - Verification

No - Checking components and wiring

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Checking components and wiring

Caution! Do not apply rust solvent spray or grease to the heated oxygen sensor (HO2S) connector.

Check signal cable (+) between heated oxygen sensor (HO2S) terminal #1 and control module terminal #A41 (#A41). Check the cable for pump current between heated oxygen sensor (HO2S) terminal #6 and control module terminal #A24 (#A24). Check for a short-circuit to supply voltage.
Check signal cable (+) between heated oxygen sensor (HO2S) terminal #1 and control module terminal #A41 (#A41). Check the cable for pump current between heated oxygen sensor (HO2S) terminal #6 and control module terminal #A24 (#A24). Check for a short-circuit to ground.
Try a new heated oxygen sensor (HO2S) if the wiring is OK.
Remedy as necessary.

Hint: If the fault remains after fault-tracing, it may indicate that the fault is in the circuit for the rear heated oxygen sensor (HO2S).

Other information
- To connect the breakout box / access the control module, see Connecting the breakout box, B5244T5, B5254T2 Connecting the Breakout Box
- To access or replace the heated oxygen sensor (HO2S) for the C70, S70, V70 -2000 and V70XC, see Adapter wiring switch, replacing Adapter Wiring Switch, Replacing. For other models, see Heated oxygen sensor (HO2S), replacing Heated Oxygen Sensor (HO2S), Replacing
- For information about signals on 5 cylinder engines, see Signal specification Signal Specification, ECM
- For information about signals on 6 cylinder engines, see Signal specification Signal Specification, ECM
- Checking wiring and terminals Checking Wiring And Terminals.














Continue - Verification

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Verification

Hint: After carrying out the repair, check that the fault has been remedied.








- Ignition off
- Reconnect the connectors. Reinstall the components
- Test drive the car according to the TRIP schedule. See Verifying repairs Verifying Repairs.
Connect VIDA again and read out the difference between the front and rear heated oxygen sensors (HO2S).
The value must be lower than +/-0.01.









Is the value lower than +/- 0.01?

Yes - Fault Found

No - Checking components and wiring

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Checking components and wiring

Caution! Do not apply rust solvent spray or grease to the heated oxygen sensor (HO2S) connector.

Hint: The fault may be caused by a fault in the circuit for the rear heated oxygen sensor (HO2S).

Check the rear heated oxygen sensor (HO2S) connector. Check for contact resistance and oxidation.
Check the signal cable (+) between heated oxygen sensor (HO2S) terminal #4 and control module terminal #A61 (#B1). Check the signal cable (-) between heated oxygen sensor (HO2S) terminal #3 and control module terminal #A62 (#B2). Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage.
Try a new heated oxygen sensor (HO2S) if the wiring is OK.
Remedy as necessary.

Other information
- To connect the breakout box / access the control module, see Connecting the breakout box, B5244T5, B5254T2 Connecting the Breakout Box
- To access or replace the heated oxygen sensor (HO2S), see Heated oxygen sensor (HO2S), replacing Heated Oxygen Sensor (HO2S), Replacing
- For information about signals on 5 cylinder engines, see Signal specification Signal Specification, ECM
- For information about signals on 6 cylinder engines, see Signal specification Signal Specification, ECM
- Checking wiring and terminals Checking Wiring And Terminals.














Continue - Verification

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Verification




Verification

Hint: After carrying out the repair, check that the fault has been remedied.








- Ignition off
- Reconnect the connectors, reinstall components etc.
- Test drive the car according to the TRIP schedule. See Verifying repairs Verifying Repairs.
Connect VIDA again and read out the difference between the front and rear heated oxygen sensors (HO2S).
The value must be lower than +/-0.01.









Is the value lower than +/- 0.01?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFICATION FAILED - Fault-tracing information

VERIFIED - Fault Found

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Fault-tracing information




Information

Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Do you want to exit fault-tracing?

Yes - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking for air leakage in the exhaust system

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