Signal Too Low
Signal too low
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 low
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Diagnostic trouble code (DTC) status ECM-2200, Rear heated oxygen sensor (HO2S), control. Signal too low
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).
Was the status of the relevant diagnostic trouble code (DTC) permanent?
Yes - Checking the connector
No - Checking wiring
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Checking the connector
- Ignition off.
Check the rear heated oxygen sensor (HO2S) connector for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Caution! Do not apply rust solvent spray or grease to the heated oxygen sensor (HO2S) connector.
Remedy as necessary.
Other information
- To access / 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.
Continue - Checking the connector
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Checking the connector
- Ignition off.
- Reinstall the components, reconnect the connectors etc.
- Start the engine and let it idle.
- Read off 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.
If the value is now OK, the cause of the fault was loose connections in the connector.
Other information
- To access / 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.
Is the value OK?
Yes - Fault Found
No - Checking wiring and components
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Checking wiring and components
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 for an open-circuit to according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Check for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check the signal cable between control module terminal A61 and heated oxygen sensor (HO2S) connector terminal 3 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Check for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
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 / 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.
Continue - Verification
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Checking wiring
Caution! Do not apply rust solvent spray or grease to the heated oxygen sensor (HO2S) connector.
Check the rear heated oxygen sensor (HO2S) connector for contact resistance and oxidation according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Check the signal cable between control module terminal A24 and heated oxygen sensor (HO2S) connector terminal 4 for an intermittent open-circuit to according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults. Check for an intermittent short-circuit to ground according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Check the signal cable (-) between control module terminal A61 and heated oxygen sensor (HO2S) connector terminal 3 for an intermittent open-circuit to according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults. Check for an intermittent short-circuit to ground according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Other information
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box
- To access the control module, see
- To access / 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.
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 low
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 low
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