Signal Missing - Permanent Fault

ECM-2810 FRONT HEATED OXYGEN SENSOR (HO2S), PREHEATING
SIGNAL MISSING - PERMANENT FAULT

Checking connector



- Ignition off.
- Check Heated Oxygen Sensor (HO2S) connector for contact resistance and oxidation according to [1][2]Checking Wiring and Terminals. Permanent Fault
- Reinstall components, reconnect connectors etc.
- Start the engine and let it idle.

Read the front Heated Oxygen Sensor (HO2S) signal Diagnostic Trouble Code (DTC) status
The text NOT READY is displayed if diagnosis is underway.

Other information
- To access/replace the heated oxygen sensor (HO2S), Adapter Wiring Switch, Replacing
- For information about signals, see Diagnostic Parameters and Pinout Values. Signal Description, ME7, B5XX4T

Is FAULT NOT REGISTERED displayed?
Yes - Skip to "Verification"
No - Continue below.


Checking wiring and components



Check the Heated Oxygen Sensor (HO2S) resistance between # 3 and # 4.

Check signal cable between Heated Oxygen Sensor (HO2S) # 4 and control module # A18 (# A18) and power supply between system relay # 3 and Heated Oxygen Sensor (HO2S) # 3 for an open-circuit according to [1][2]Checking Wiring and Terminals. Permanent Fault

Remedy as necessary.

Other information
- Connecting the breakout box/accessing the control module Connecting the Breakout Box (ECM)
- To access/replace the heated oxygen sensor (HO2S), Adapter Wiring Switch, Replacing
- For resistance values, see Component Specifications. Specifications
- For information about signals, see Diagnostic Parameters and Pinout Values. Signal Description, ME7, B5XX4T


Verification



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

- Ignition off.
- Reinstall components, reconnect connectors etc.
- Start the engine and let it idle.

Read the front Heated Oxygen Sensor (HO2S) signal Diagnostic Trouble Code (DTC) status.
The text NOT READY is displayed if diagnosis is underway.

Is FAULT NOT REGISTERED displayed?
Yes - Testing Complete.
No - Continue below.


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.