Signal Too Low

ECM-2210 REAR HEATED OXYGEN SENSOR (HO2S), HEATING
SIGNAL TOO LOW

Diagnostic trouble code (DTC) status ECM-2210 Rear heated oxygen sensor (HO2S), heating




Note! When Reading the Diagnostic trouble code (DTC) status, other stored diagnostic trouble codes (DTCs) and their status will be listed.

Read the Diagnostic trouble code (DTC) status. Check the status of the relevant Diagnostic Trouble Code (DTC).

Was the status of the relevant Diagnostic Trouble Code (DTC) displayed as permanent?
Yes - Skip to "Checking Wiring and Components"
No - Continue below.


Checking wiring and connectors



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

Check cable between control module # A11 and rear heated oxygen sensor (HO2S) # 2 for an intermittent open-circuit according to [1][2]Checking Wiring and Terminals. Intermittent Faults

Other information
- To connect the breakout box, Connecting the Breakout Box (ECM)
- To access/replace the control module, Engine Control Module (ECM), Replacing
- To access/replace the heated oxygen sensor (HO2S), Heated Oxygen Sensor (HO2S), Replacing
- For information about signals, Pinout Values and Diagnostic Parameters


Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
--Testing Complete--


Checking Wiring and Components



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

Check the resistance of the rear heated oxygen sensor (HO2S) element between # 1 and # 2. Resistance should be approximately 5.0 - 6.8 (ohm) at 20°C (68°F).

Check heated oxygen sensor (HO2S) connector for contact resistance and oxidation according to [1][2]Checking Wiring and Terminals. Permanent Fault

Check the cable between control module # A11 and rear heated oxygen sensor (HO2S) # 2 for a short-circuit to ground according to [1][2]Checking Wiring and Terminals. Permanent Fault and for an open-circuit according to [1][2]Checking Wiring and Terminals. Permanent Fault

Check cable between rear heated oxygen sensor (HO2S) # 1 and fuse 2 in the R/S box for an open-circuit according to [1][2]Checking Wiring and Terminals. Permanent Fault

Remedy as necessary.

Other information
- To connect the breakout box, Connecting the Breakout Box (ECM)
- To access/replace the control module, Engine Control Module (ECM), Replacing
- To access/replace the heated oxygen sensor (HO2S), Heated Oxygen Sensor (HO2S), Replacing
- For information about signals, Pinout Values and Diagnostic Parameters


Verification



Hint: After carrying out the repair, check that the fault has been remedied. Ignition off.
- Reconnect connectors, reinstall components
- Start the engine and let it idle.
- Read the signal for the rear heated oxygen sensor (HO2S).

NOTE: It takes approximately 50 seconds before fuel trim starts.

Check that the signal is within its permitted range. The signal should rise and exceed 0.67 V.

Is the value OK?
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.