Signal Too High
Signal too high
Checking software
Checking software
Checking software
Note! The information below only applies to modal year 2003-2004.For other model years, select the alternative "No".
It may be possible to remedy the fault by downloading new software into the control module.
Action
- Go to the tab software and program the control module with the latest software.
Other information
- For more information, see Design and Function.
Has the fault been remedied?
Yes - Fault Found
No - No Fault Found
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FAULT FOUND - Fault Found
No Fault Found - Rear heated oxygen sensor (HO2S), control. Signal too high
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Diagnostic trouble code (DTC) status ECM-2200, Rear heated oxygen sensor (HO2S), control. Signal too high
Note! When reading off the diagnostic trouble code (DTC) status, other stored diagnostic trouble codes (DTCs) and their status will also be listed.
Read off the diagnostic trouble code (DTC) status. Check the status of the relevant diagnostic trouble code (DTC).
Other information
- For information about the status of the diagnostic trouble code (DTC), see Description of diagnostic trouble code (DTC) status Description of Diagnostic Trouble Code (DTC) Status.
Was the status of the relevant diagnostic trouble code (DTC) permanent?
Yes - Checking wiring and component
No - Checking wiring
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Checking wiring and component
Caution! Do not apply rust solvent spray or grease to the heated oxygen sensor (HO2S) connector.
Check the signal cable between control module terminal #A24 and heated oxygen sensor (HO2S) connector terminal 4. Check for a short-circuit to supply voltage.
Check the signal cable between control module terminal #A61 and heated oxygen sensor (HO2S) connector terminal 3. 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, see Connecting the breakout box Connecting the Breakout Box
- To access the control module, see
- To access or replace the heated oxygen sensor (HO2S), see Heated oxygen sensor (HO2S), replacing Heated Oxygen Sensor (HO2S), Replacing
- For information about signals, see Signal specification Signal Description / Specification
- Checking wiring and terminals Checking Wiring And Terminals.
Continue - Verification
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Checking wiring
Check the signal cable between control module terminal #A24 and heated oxygen sensor (HO2S) connector terminal #4. Check for an intermittent short-circuit to supply voltage.
Check the signal cable (-) between control module terminal #A61 and heated oxygen sensor (HO2S) terminal #3. Check for an intermittent short-circuit to supply voltage.
Other information
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box
- To access the control module, see
- To access or replace the heated oxygen sensor (HO2S), see Heated oxygen sensor (HO2S), replacing Heated Oxygen Sensor (HO2S), Replacing
- For information about signals, see Signal specification Signal Description / Specification
- Checking wiring and terminals Checking Wiring And Terminals.
Continue - Fault-tracing information
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Fault-tracing information
Information
Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).
Do you want to view the information again?
Yes - Attempt New Test
No - Fault Found
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Attempt New Test - Rear heated oxygen sensor (HO2S), control. Signal too high
FAULT FOUND - DONE
DONE - DONE
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Verification
Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off.
- Reconnect connectors, reinstall components etc.
- Start the engine and let it idle.
- Read off the signal from 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 - 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 - Rear heated oxygen sensor (HO2S), control. Signal too high
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