DTC P2097 [L3 Turbo]
id0102b7810900
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DTC P2097 |
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 while under 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)
• MIL illuminates if the PCM detects the above malfunction 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 the first drive cycle.
• FREEZE FRAME DATA is available.
• DTCs are stored in the PCM memory.
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POSSIBLE CAUSE
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• HO2S malfunction
• Exhaust gas leakage
• Erratic signal to PCM
• A/F sensor malfunction
• Excessive fuel line pressure
• Fuel pressure sensor malfunction
• Relief valve (built-in fuel delivery pipe) malfunction
• Spill valve control solenoid valve (built-in high pressure fuel pump) malfunction
• High pressure fuel pump malfunction
• Fuel pump malfunction
• Purge 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 HAVE BEEN RECORDED
• Have the FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS (Fuel system related) 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 DATA and DIAGNOSTIC MONITORING TEST RESULTS on the repair order, then go to the next step.
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2
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VERIFY 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
• Turn the ignition switch off, then to the ON position (Engine off).
• Verify the related PENDING CODE or stored DTCs.
• Is the DTC P2178 or P2188 also present?
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Yes
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Go to the applicable DTC inspection.
(SeeDTC TABLE [L3 Turbo].)
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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 DTC P2097 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.
(SeeDTC TABLE [L3 Turbo].)
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5
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INSPECT HO2S
• Inspect the HO2S.
• Is the 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 HO2S.
Then go to Step 16.
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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:
• 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 16.
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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.
• 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 16.
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8
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VERIFY CURRENT INPUT SIGNAL STATUS OF A/F SENSIOR
• Perform the A/F sensor inspection.
• Is the 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 A/F sensor.
Then go to Step 16.
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9
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INSPECT FUEL PRESSURE (HIGH-SIDE)
• Access and monitor FUEL_PRES PID.
• Is the FUEL_PRES PID value within the specified?
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Yes
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Go to Step 14.
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No
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Go to the next step.
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10
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IDENTIFY CAUSE BY FUEL PRESSURE SENSOR OR HIGH PRESSURE FUEL PUMP
• Is the vehicle accelerate performance normally?
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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 Step 12.
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11
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INSPECT FUEL PRESSURE SENSOR
• Inspect the fuel pressure sensor.
• Is the fuel pressure sensor normal?
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Yes
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Go to Step 14.
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No
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Replace the fuel delivery pipe, then go to Step 16.
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12
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INSPECT HIGH PRESSURE FUEL PUMP
• Replace the high pressure fuel pump.
• Monitor FUEL_PRES PID.
• Is the FUEL_PRES PID value within the specified?
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Yes
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Go to Step 16.
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No
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Go to the next step.
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13
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INSPECT FUEL PRESSURE (LOW-SIDE)
• Connect the fuel pressure gauge between fuel pump and high pressure fuel pump.
• Measure the low side fuel pressure.
• Is the low side fuel pressure within the specified?
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Yes
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Go to the next step.
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No
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Inspect for following:
• Fuel line restriction
• Fuel filter clogging
If normal replace the fuel pump. Then go to Step 16.
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14
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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 valve.
• If there is any malfunction, replace the purge valve.
Then go to Step 16.
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No
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Go to the next step.
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15
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INSPECT ENGINE COMPRESSION
• Inspect the engine compression.
• Is there any malfunction?
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Yes
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Go to the next step.
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No
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Overhaul the engine, then go to the next step.
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16
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VERIFY TROUBLESHOOTING OF DTC P2097 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.
• 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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17
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VERIFY AFTER REPAIR PROCEDURE
• Perform the “AFTER REPAIR PROCEDURE”.
• Are any DTCs present?
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Yes
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Go to the applicable DTC inspection.
(SeeDTC TABLE [L3 Turbo].)
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No
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Troubleshooting completed.
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