DTC P2097, P2099 [AJ]

BME010202000W02

DTC P2097

DTC P2099

Target A/F feedback system too rich (Right bank)

Target A/F feedback system too rich (Left bank)

DETECTION CONDITION

• 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 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 the first drive cycle.
• FREEZE FRAME DATA is available.
• DTC is stored in the PCM memory.

POSSIBLE CAUSE

• Leakage exhaust gas
• HO2S (RR, LR) malfunction
• IAT sensor malfunction
• ECT sensor malfunction
• HO2S (RF, LF) malfunction
• Excessive fuel line pressure
• Fuel pump unit malfunction
• Purge valve malfunction
• Insufficient engine compression
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED
• Have FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS (Fuel system related) been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS on the repair order, then go to the next step.
2
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
• Verify related Service Information and/or on-line repair information availability.
• Is any related repair information available?
Yes
Perform repair or diagnosis according to the available repair 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 ON position (Engine off).
• Verify the related PENDING CODE or stored DTCs using the WDS or equivalent.
• Is the DTC P2178 or P2188 (with P2097), P2179 or P2180 (with P2099) also present?
Yes
Go to appropriate DTC troubleshooting procedure.
No
Go to the next step.
4
IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA
• Is DTC P2097 or P2099 on FREEZE FRAME DATA?
Yes
Go to the next step.
No
Go to troubleshooting for DTC on FREEZE FRAME DATA.
5
VERIFY CURRENT INPUT SIGNAL STATUS OF REAR HO2S
• Start the engine and warm it up completely.
• Access O2S12 (with P2097) or O2S22 (with P2099) PID WDS or equivalent.
• Read O2S12 or O2S22 PID under following accelerator pedal condition (in PARK).
• Is PID reading normal?

- 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).

Yes
Go to the next step.
No
Visually inspect for the exhaust gas leakage between TWC and rear HO2S.
• If there is no leakage, replace rear HO2S.
Then go to Step 11.
6
VERIFY CURRENT INPUT SIGNAL STATUS (IGNITION SWITCH TO ON/IDLE)
• Access ECT, MAF, TP and VSS PIDs using the WDS or equivalent.
• Is there any signal that is far out of specification when ignition switch ON and engine runs?
Yes
Inspect suspected sensor and excessive resistance in related wiring harnesses.
Repair or if necessary.
Then go to Step 11.
No
Go to the next step.
7
VERIFY CURRENT INPUT SIGNAL STATUS UNDER TROUBLE CONDITION
• Inspect same PIDs as Step 6 while simulating FREEZE FRAME DATA condition.
• Is there any signal which causes drastic changes?
Yes
Inspect suspected sensor and excessive resistance in related wiring harnesses.
Repair or if necessary.
Then go to Step 11.
No
Go to the next step.
8
VERIFY CURRENT INPUT SIGNAL STATUS OF FRONT HO2S
• Start the engine and warm it up completely.
• Access O2S11 (with P2097) or O2S21 (with P2099) PID using the WDS or equivalent.
• Read O2S11 or O2S12 PID under following accelerator pedal condition (in PARK).
• Is PID reading normal?

- 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).

Yes
Go to the next step.
No
Visually inspect for the exhaust gas leakage between exhaust manifold and front HO2S.
• If there is no leakage, replace front HO2S.
Then go to Step 11.
9
INSPECT FUEL LINE PRESSURE
• Perform the "FUEL LINE PRESSURE INSPECTION".
• Is there any malfunction?
Yes
Replace the fuel pump unit, then go to Step 11.
No
Go to the next step.
10
INSPECT LONG TERM FUEL TRIM
• Access LONGFT1 (with P2097) or LONGFT2 (with P2099) PID using the WDS or equivalent.
• Compare the LONGFT1 PID with recorded FREEZE FRAME DATA at Step1.
• Is the LONGFT1 or LONGFT2 PID above FREEZE FRAME DATA?
Yes
Inspect purge solenoid valve.
• If there is any malfunction, replace purge valve.
Then go to Step 11.
No
Go to the next step.
11
VERIFY TROUBLESHOOTING OF DTC P2097 AND P2099 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear DTC from PCM memory using WDS or equivalent.
• Perform the PCM Adaptive Memory Produce Drive MODE.
• Is the PENDING CODE same DTC present?
Yes
Replace PCM, then go to the next step.
No
Go to the next step.
12
VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
Troubleshooting completed.