Signal Too High

ECM-2110 FRONT HEATED OXYGEN SENSOR (HO2S), CONTROL
SIGNAL TOO HIGH

DTC status ECM-2110, front Heated Oxygen Sensor (HO2S), heating



Note! When Reading the DTC status, other stored Diagnostic Trouble Codes (DTCs) and their status will be listed.

Read the 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



Check the cable between engine control module (ECM) # A18 and Heated Oxygen Sensor (HO2S) # 2 for an intermittent short-circuit to supply voltage 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



Check the resistance of the front Heated Oxygen Sensor (HO2S) element between # 1 and # 2. Resistance should be approximately 1.0 at 20°C (68°F).

Check the cable between control module # A18 and front Heated Oxygen Sensor (HO2S) # 2 for a short-circuit to supply voltage 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 the connectors, reinstall components etc.
- Ignition on.
- Read the heater element resistance in the front Heated Oxygen Sensor (HO2S).

The resistance should be 0.5 - 3[ohm] at 20°C.

Is the value correct?
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.