id0102c9707500
| DTC P2096:00 |
Target A/F feedback system too lean |
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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 more than the specification, the PCM determines that the target A/F feedback system is too lean.
Diagnostic support note
• This is a continuous monitor (fuel system).
• The 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 condition during first drive cycle.
• FREEZE FRAME DATA (Mode 2)/Snapshot data is available.
• The DTC is stored in the PCM memory.
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POSSIBLE CAUSE
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• Leakage exhaust gas (between A/F sensor and HO2S)
• HO2S malfunction
• IAT sensor malfunction
• Erratic signal to PCM
• Leakage exhaust gas (between exhaust manifold and A/F sensor)
• A/F sensor malfunction
• Air suction in intake air system
• MAF sensor malfunction
• Insufficient fuel line pressure
• Leakage fuel
• Fuel pump unit malfunction
• Ignition system malfunction
• Improper operation of fuel injector
• Insufficient engine compression
• ECT sensor malfunction
• PCM malfunction
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Diagnostic procedure
| STEP |
INSPECTION |
ACTION |
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|---|---|---|---|
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1
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IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA (MODE 2)
• Perform the Freeze Frame PID Data Access Procedure. (See
ON-BOARD DIAGNOSTIC TEST [L5].)
• Is the DTC P2096:00 on FREEZE FRAME DATA (Mode 2)?
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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 the troubleshooting procedure for DTC on FREEZE FRAME DATA (Mode 2).
(See
DTC TABLE [L5].)
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2
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VERIFY FREEZE FRAME DATA (MODE 2)/SNAPSHOT DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED
• Have the FREEZE FRAME DATA (Mode 2)/snapshot 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 (Mode 2)/snapshot data and DIAGNOSTIC MONITORING TEST RESULTS on the repair order, then go to the next step.
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3
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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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4
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VERIFY RELATED PENDING CODE AND/OR DTC
• Turn the ignition switch off, then to the ON position (engine off).
• Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure. (See
ON-BOARD DIAGNOSTIC TEST [L5].)
• Are any other PENDING CODEs and/or DTCs present?
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Yes
|
Go to the applicable PENDING CODE or DTC inspection.
(See
DTC TABLE [L5].)
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No
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Go to the next step.
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5
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VERIFY CURRENT INPUT SIGNAL STATUS OF HO2S
• Inspect the HO2S. (See
HEATED OXYGEN SENSOR (HO2S) INSPECTION [L5].)
• Is there any malfunction?
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Yes
|
Go to the next step.
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No
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Go to Step 7.
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6
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INSPECT EXHAUST GAS LEAKAGE
• Visually inspect for the exhaust gas leakage between the A/F sensor and HO2S.
• Is there any leakage?
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Yes
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Repair or replace the malfunctioning part according to the inspection results, then go to Step 20.
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No
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Replace the HO2S, then go to Step 20.
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7
|
INSPECT IAT SENSOR
• Turn the ignition switch off.
• Inspect the IAT sensor. (See
INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION [L5].)
• Is there any malfunction?
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Yes
|
Replace the MAF/IAT sensor, then go to Step 20.
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No
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Go to the next step.
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8
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VERIFY CURRENT INPUT SIGNAL STATUS
• Access the following PIDs using the M-MDS: (See
ON-BOARD DIAGNOSTIC TEST [L5].)
• Are all PIDs normal? (See
PCM INSPECTION [L5].)
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning part according to the inspection results, then go to Step 20.
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9
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VERIFY CURRENT INPUT SIGNAL STATUS UNDER FREEZE FRAME DATA (MODE 2) CONDITION
• Access the same PIDs as in Step 8 under the FREEZE FRAME DATA (Mode 2) conditions. (See
ON-BOARD DIAGNOSTIC TEST [L5].)
• Are all PIDs normal? (See
PCM INSPECTION [L5].)
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning part according to the inspection results, then go to Step 20.
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10
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VERIFY CURRENT INPUT SIGNAL STATUS OF A/F SENSOR
• Inspect the A/F sensor. (See
AIR FUEL RATIO (A/F) SENSOR INSPECTION [L5].)
• 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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Go to Step 12.
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11
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INSPECT EXHAUST GAS LEAKAGE
• Visually inspect for the exhaust gas leakage between the exhaust manifold and A/F sensor.
• Is there any leakage?
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Yes
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Repair or replace the malfunctioning part according to the inspection results, then go to Step 20.
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No
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Replace the A/F sensor, then go to Step 20.
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12
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VERIFY CURRENT INPUT SIGNAL STATUS OF MAF SENSOR
• Start the engine.
• Access the MAF PID using the M-MDS. (See
ON-BOARD DIAGNOSTIC TEST [L5].)
• Verify that the MAF PID changes quickly according to engine speed.
• Is the MAF PID value normal? (See
PCM INSPECTION [L5].)
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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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13
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INSPECT INTAKE AIR SYSTEM FOR EXCESSIVE AIR SUCTION
• Turn the ignition switch off.
• Visually inspect the hose in intake air system for looseness, cracks or damages.
• Is there any malfunction?
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Yes
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Repair or replace the malfunctioning part according to the inspection results, then go to Step 20.
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No
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Replace the MAF/IAT sensor, then go to Step 20.
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14
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INSPECT FUEL LINE PRESSURE
• Turn the ignition switch off.
• Inspect the fuel line pressure while the engine running. (See
FUEL LINE PRESSURE INSPECTION [L5].)
• 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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Go to Step 16.
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15
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INSPECT FUEL SYSTEM FOR FUEL LEAKAGE
• Visually inspect the fuel leakage in the fuel system.
• Is there any leakage?
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Yes
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Repair or replace the malfunctioning part according to the inspection results, then go to Step 20.
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No
|
Replace the fuel pump unit, then go to Step 20.
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16
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INSPECT IGNITION SYSTEM OPERATION
• Perform the Spark Test. (See
ENGINE CONTROL SYSTEM OPERATION INSPECTION [L5].)
• Is a strong blue spark visible at each cylinder?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning part according to the inspection results, then go to Step 20.
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17
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INSPECT FUEL INJECTOR OPERATION
• Perform the Fuel Injector Operation Inspection. (See
ENGINE CONTROL SYSTEM OPERATION INSPECTION [L5].)
• Is there any malfunction?
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Yes
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Repair or replace the malfunctioning part according to the inspection results, then go to Step 20.
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No
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Go to the next step.
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18
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INSPECT ENGINE COMPRESSION
• Inspect the engine compression. (See
COMPRESSION INSPECTION [L5].)
• Is there any malfunction?
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Yes
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Repair or replace the malfunctioning part according to the inspection results, then go to Step 20.
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No
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Go to the next step.
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19
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INSPECT ECT SENSOR
• Inspect the ECT sensor. (See
ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [L5].)
• Is there any malfunction?
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Yes
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Replace the ECT sensor, then go to the next step.
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No
|
Go to the next step.
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20
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VERIFY DTC TROUBLESHOOTING COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using the M-MDS. (See
AFTER REPAIR PROCEDURE [L5].)
• Drive the vehicle under the FREEZE FRAME DATA (Mode 2) conditions.
• Perform the Pending Trouble Code Access Procedure. (See
ON-BOARD DIAGNOSTIC TEST [L5].)
• Is the PENDING CODE for this DTC present?
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Yes
|
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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21
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VERIFY AFTER REPAIR PROCEDURE
• Perform the “AFTER REPAIR PROCEDURE”. (See
AFTER REPAIR PROCEDURE [L5].)
• Are any DTCs present?
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Yes
|
Go to the applicable DTC inspection.
(See
DTC TABLE [L5].)
|
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No
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DTC troubleshooting completed.
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