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 DTC P2097 [L3 Turbo]

DTC P2097 [L3 Turbo]

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DTC P2097

Target A/F feedback system too rich

DETECTION CONDITION

• 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)
• 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 the first drive cycle.
• FREEZE FRAME DATA is available.
• DTCs are stored in the PCM memory.

POSSIBLE CAUSE

• Exhaust gas leakage
• HO2S malfunction
• IAT sensor malfunction
• ECT sensor malfunction
• 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

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAS BEEN RECORDED
• Has FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
• Verify related Service Information availability.
• Is any related Service Information available?
Yes
Perform repair or diagnosis according to the available Service information.
If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
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?
Yes
Go to the applicable DTC inspection.
No
Go to the next step.
4
IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA
• Is DTC P2097 on FREEZE FRAME DATA?
Yes
Go to the next step.
No
Go to FREEZE FRAME DATA DTC inspection.
5
VERIFY CURRENT INPUT SIGNAL STATUS OF HO2S
• Connect the WDS or equivalent to the DLC-2.
• Start the engine and warm it up completely.
• Access the O2S12 PID.
• Read the O2S12 PID under following accelerator pedal condition (in NEUTRAL).

- More than 0.45 V when accelerator pedal is suddenly depressed (rich condition).

- Less than 0.45 V just after release of accelerator pedal (lean condition)

• Is the PID normal?
Yes
Go to the next step.
No
Visually inspect for the exhaust gas leakage between TWC and HO2S.
• If there is no leakage, replace HO2S.
Then go to Step 15.
6
VERIFY CURRENT INPUT SIGNAL STATUS
• Connect the WDS or equivalent to the DLC-2.
• Verify the following PIDs:
- ECT
- MAF
- TP
- VSS
• Are the PIDs normal?
Yes
Go to the next step.
No
Inspect the malfunctioning part according to the inspection results.
Then go to Step 15.
7
VERIFY CURRENT INPUT SIGNAL STATUS UNDER FREEZE FRAME DATA CONDITION
• Connect the WDS or equivalent to the DLC-2.
• Verify the following PIDs under FREEZE FRAME DATA condition.
- ECT
- MAF
- TP
- VSS
• Are the PIDs normal?
Yes
Go to the next step.
No
Inspect the malfunctioning part according to the inspection results.
Then go to Step 15.
8
VERIFY CURRENT INPUT SIGNAL STATUS OF A/F SENSOR
• Connect the WDS or equivalent to the DLC-2.
• Start the engine and warm it up completely.
• Access the O2S11 PID.
• Read the O2S11 PID under following accelerator pedal condition (in NEUTRAL).

- -0.1-0.1A when idle

- More than 0.25 mA just after release of accelerator pedal (lean condition).

• Is the PID normal?
Yes
Go to the next step.
No
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 15.
9
INSPECT FUEL PRESSURE (HIGH-SIDE)
• Access and monitor FUEL_PRES PID.
• Is the FUEL_PRES PID value within the specified?
Yes
Go to Step 14.
No
Go to the next step.
10
IDENTIFY CAUSE BY FUEL PRESSURE SENSOR OR HIGH PRESSURE FUEL PUMP
• Is the vehicle accelerate performance normally?
Yes
Go to the next step.
No
Go to Step 12.
11
INSPECT FUEL PRESSURE SENSOR
• Inspect the fuel pressure sensor.
• Is the fuel pressure sensor normal?
Yes
Go to Step 14.
No
Replace the fuel delivery pipe, then go to Step 15.
12
INSPECT HIGH PRESSURE FUEL PUMP
• Replace the high pressure fuel pump.
• Monitor FUEL_PRES PID.
• Is the FUEL_PRES PID value within the specified?
Yes
Go to Step 15.
No
Go to the next step.
13
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?
Yes
Go to the next step.
No
Inspect for following:
• Fuel line restriction
• Fuel filter clogging
If normal replace the fuel pump. Then go to Step 15.
14
INSPECT LONG TERM FUEL TRIM
• Connect the WDS or equivalent 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?
Yes
Inspect the purge valve.
• If there is any malfunction, replace the purge valve.
Then go to the next step.
No
Go to the next step.
15
VERIFY TROUBLESHOOTING OF DTC P2097 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using the WDS or equivalent.
• Perform the PCM Adaptive Memory Produce Drive Mode.
• Is the PENDING CODE for this DTC present?
Yes
Replace the PCM, then go to the next step.
No
Go to the next step.
16
VERIFY AFTER REPAIR PROCEDURE
• Perform the "AFTER REPAIR PROCEDURE".
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
Troubleshooting completed.