DTC P2097:00 [L8, LF, L5]
id010242707600
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DTC P2097:00 |
Target A/F feedback system too rich |
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DETECTION CONDITION
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• The PCM monitors the target A/F fuel trim when under the target A/F feedback control. If the fuel trim is less than specification, the PCM determines that the target A/F feedback system is too rich.
Diagnostic support note
• This is a continuous monitor. (Fuel system)
• The MIL illuminates if the PCM detects the above malfunctioning condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
• PENDING CODE is available if the PCM detects the above malfunction conditions during first drive cycle.
• FREEZE FRAME DATA is available.
• The DTC is stored in the PCM memory.
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POSSIBLE CAUSE
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• Leakage exhaust gas
• HO2S malfunction
• IAT sensor malfunction
• ECT sensor malfunction
• A/F sensor malfunction
• Excessive fuel line pressure
• Fuel pump unit malfunction
• Purge solenoid valve malfunction
• Insufficient engine compression
• PCM malfunction
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Diagnostic procedure
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STEP |
INSPECTION |
ACTION |
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1
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VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAS BEEN RECORDED
• Has FREEZE FRAME DATA been recorded?
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Yes
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Go to the next step.
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No
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Record the FREEZE FRAME on the repair order, then go to the next step.
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2
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VERIFY RELATED SERVICE INFORMATION AVAILABILITY
• Verify related Service Information availability.
• Is any related Service Information available?
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Yes
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Perform repair or diagnosis according to the available Service information.
If the vehicle is not repaired, go to the next step.
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No
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Go to the next step.
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3
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VERIFY RELATED PENDING CODE OR STORED DTC
• Switch the ignition to off, then to the ON (Engine off).
• Verify the related PENDING CODE or stored DTCs.
• Is the DTC P2178:00 or P2188:00 also present?
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Yes
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Go to the applicable DTC inspection.
(See DTC TABLE [L8, LF, L5].)
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No
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Go to the next step.
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4
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IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA
• Is the DTC P2097:00 on FREEZE FRAME DATA?
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Yes
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Go to the next step.
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No
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Go to FREEZE FRAME DATA DTC inspection.
(See DTC TABLE [L8, LF, L5].)
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5
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INSPECT HO2S
• Inspect the HO2S.
• Is HO2S normal?
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Yes
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Go to the next step.
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No
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Visually inspect for the exhaust gas leakage between TWC and HO2S.
• If there is no leakage, replace the HO2S.
Then go to Step 11.
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6
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VERIFY CURRENT INPUT SIGNAL STATUS
• Connect the M-MDS to the DLC-2.
• Verify the following PIDs:
(See PCM INSPECTION [L8, LF, L5].)
• Are the PIDs normal?
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Yes
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Go to the next step.
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No
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Inspect the malfunctioning part according to the inspection results.
Then go to Step 11.
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7
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VERIFY CURRENT INPUT SIGNAL STATUS UNDER FREEZE FRAME DATA CONDITION
• Connect the M-MDS to the DLC-2.
• Verify the following PIDs under FREEZE FRAME DATA condition.
(See PCM INSPECTION [L8, LF, L5].)
• Are the PIDs normal?
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Yes
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Go to the next step.
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No
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Inspect the malfunctioning part according to the inspection results.
Then go to Step 11.
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8
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INSPECT A/F SENSOR
• Inspect the A/F sensor.
• Is A/F sensor normal?
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Yes
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Go to the next step.
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No
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Visually inspect for exhaust gas leakage between the exhaust manifold and A/F sensor.
• If there is no leakage, replace the A/F sensor.
Then go to Step 11.
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9
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INSPECT FUEL LINE PRESSURE
• Perform the “FUEL LINE PRESSURE INSPECTION”.
• Is there any malfunction?
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Yes
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Replace the fuel pump unit, then go to Step 11.
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No
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Go to the next step.
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10
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INSPECT LONG TERM FUEL TRIM
• Connect the M-MDS to the DLC-2.
• Access LONGFT1 PID.
• Compare the LONGFT1 PID with recorded FREEZE FRAME DATA at Step 1.
• Is the LONGFT1 PID above FREEZE FRAME DATA?
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Yes
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Inspect the purge solenoid valve.
• If there is any malfunction, replace the purge solenoid valve.
Then go to Step 11.
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No
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Go to the next step.
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11
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VERIFY TROUBLESHOOTING OF DTC P2097:00 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using the M-MDS.
• Perform the PCM Adaptive Memory Produce Drive Mode.
(See OBD DRIVE MODE [L8, LF, L5].)
• Is the PENDING CODE for this DTC present?
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Yes
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Replace the PCM, then go to the next step.
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No
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Go to the next step.
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12
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VERIFY AFTER REPAIR PROCEDURE
• Perform the “AFTER REPAIR PROCEDURE”.
• Are any DTC present?
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Yes
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Go to the applicable DTC inspection.
(See DTC TABLE [L8, LF, L5].)
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No
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Troubleshooting completed.
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