DTC P2097 [LF]

2008 - MX-5 - Engine

DTC P2097 [LF]


DTC P2097	Target A/F feedback system too rich
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 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. The DTC is stored in the PCM memory.
POSSIBLE CAUSE	Leakage exhaust gas Rear HO2S malfunction IAT sensor malfunction ECT sensor malfunction Front HO2S malfunction Excessive fuel line pressure Fuel pump unit malfunction Purge valve malfunction Insufficient engine compression PCM malfunction

DTC P2097

Target A/F feedback system too rich

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 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.

The DTC is stored in the PCM memory.

POSSIBLE CAUSE

Leakage exhaust gas

Rear HO2S malfunction

IAT sensor malfunction

ECT sensor malfunction

Front HO2S 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.
1		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 Bulletins 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.
2		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. (See DTC TABLE [LF].)
3		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.
4		No	Go to FREEZE FRAME DATA DTC inspection. (See DTC TABLE [LF].)
5	INSPECT REAR HO2S Inspect the rear HO2S (See REAR HEATED OXYGEN SENSOR (HO2S) INSPECTION [LF].) Is HO2S normal?	Yes	Go to the next step.
5		No	Visually inspect for the exhaust gas leakage between TWC and rear HO2S. If there is no leakage, replace rear HO2S. (See REAR HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [LF].) Then go to Step 11.
6	VERIFY CURRENT INPUT SIGNAL STATUS Connect the M-MDS to the DLC-2. Verify the following PIDs: (See PCM INSPECTION [LF].) ECT MAF TP VSS Are the PIDs normal?	Yes	Go to the next step.
6		No	Inspect the malfunctioning part according to the inspection results. Then go to Step 11.
7	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 [LF].) ECT MAF TP VSS Are the PIDs normal?	Yes	Go to the next step.
7		No	Inspect the malfunctioning part according to the inspection results. Then go to Step 11.
8	INSPECT FRONT HO2S Inspect the front HO2S (See FRONT HEATED OXYGEN SENSOR (HO2S) INSPECTION [LF].) Is HO2S normal?	Yes	Go to the next step.
8		No	Visually inspect for exhaust gas leakage between the exhaust manifold and front HO2S. If there is no leakage, replace front HO2S. (See FRONT HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [LF].) Then go to Step 11.
9	INSPECT FUEL LINE PRESSURE Perform the “FUEL LINE PRESSURE INSPECTION”. (See FUEL LINE PRESSURE INSPECTION [LF].) Is there any malfunction?	Yes	Replace the fuel pump unit, then go to Step 11. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [LF].)
9		No	Go to the next step.
10	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?	Yes	Inspect the purge valve. (See PURGE SOLENOID VALVE INSPECTION [LF].) If there is any malfunction, replace the purge valve. (See INTAKE-AIR SYSTEM VACUUM HOSE ROUTING DIAGRAM [LF].) Then go to Step 11.
10		No	Go to the next step.
11	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. (See OBD-II DRIVE MODE [LF].) Is the PENDING CODE for this DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [LF].)
11		No	Go to the next step.
12	VERIFY AFTER REPAIR PROCEDURE Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [LF].) Are any DTC present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [LF].)
12		No	Troubleshooting completed.

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