DTC P2097 [13B-MSP]

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 more than the 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. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE	• HO2S malfunction • Leakage exhaust gas • A/F sensor malfunction • Fuel pump speed control malfunction • Fuel line pressure malfunction • Fuel pump unit malfunction • Purge solenoid valve malfunction • Insufficient compression ― Metering oil pump malfunction ― Engine oil condition malfunction ― Increased oil pressure ― Oil passage malfunction ― Engine malfunction • 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 more than the 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.

• The DTC is stored in the PCM memory.

POSSIBLE CAUSE

• HO2S malfunction

• Leakage exhaust gas

• A/F sensor malfunction

• Fuel pump speed control malfunction

• Fuel line pressure malfunction

• Fuel pump unit malfunction

• Purge solenoid valve malfunction

• Insufficient compression

― Metering oil pump malfunction

― Engine oil condition malfunction

― Increased oil pressure

― Oil passage malfunction

― Engine malfunction

• PCM malfunction

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 SERVICE INFORMATION AVAILBAILITY • Verify related Service information availability. • Is any related Service information available?	Yes	Perform repair or diagnosis according to thavailable 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 P0172 also present?	Yes	Go to the DTC P0172 inspection. (See DTC P0172 [13B-MSP].)
No	If misfire DTC is present or drivability concern exists, go to step 11. If misfire DTC is not present and drivability concern does not exist, 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 the FREEZE FRAME DATA DTC inspection. (See DTC TABLE [13B-MSP].)
5	INSPECT HO2S • Inspect the HO2S. (See HEATED OXYGEN SENSOR (HO2S) INSPECTION [13B-MSP].) • Is there any malfunction?	Yes	Visually inspect for the gas leakage between TWC and HO2S. • If there is no leakage, replace the HO2S, then go to Step 17. (See HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [13B-MSP].)
No	Go to the next step.
6	VERIFY CURRENT INPUT SIGNAL STATUS • Connect the M-MDS to the DLC-2. • Verify the following PIDs. (See PCM INSPECTION [13B-MSP].) ― APP ― ECT ― MAF ― TP REL ― 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 17.
7	VERIFY CURRENT INPUT SIGNAL STATUS UNDER FREEZE FRAME DATA CONDITION • Connect the M-MDS to the DLC-2. • Verify the following PIDs under the FREEZE FRAME DATA condition. (See PCM INSPECTION [13B-MSP].) ― APP ― ECT ― MAF ― TP REL ― 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 17.
8	INSPECT A/F SENSOR • Inspect the A/F sensor. (See AIR FUEL RATIO (A/F) SENSOR INSPECTION [13B-MSP].) • Is there any malfunction?	Yes	Inspect the following: • Loose installation of A/F sensor • Exhaust gas leakage between exhaust manifold and A/F sensor If there is no malfunction detected, replace the A/F sensor. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [13B-MSP].) If there is a malfunction detected, repair or replace the malfunctioning part. Then go to Step 17.
No	Go to the next step.
9	INSPECT FUEL PUMP SPEED CONTROL OPERATION • Perform the “Fuel Pump Speed Control Operation Inspection”. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [13B-MSP].) • Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results, then go to Step 17.
No	Go to the next step.
10	INSPECT FUEL LINE PRESSURE • Perform the “FUEL LINE PRESSURE INSPECTION”. (See FUEL LINE PRESSURE INSPECTION [13B-MSP].) • Is there any malfunction?	Yes	• If the fuel line pressure is too low, go to the next step. • If the fuel line pressure is too high, replace the fuel pump unit, then go to Step 17. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [13B-MSP].)
No	Go to Step 12.
11	INSPECT LONG TERM FUEL TRIM • Connect the M-MDS to the DLC-2. • Access the 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 solenoid valve. (See PURGE SOLENOID VALVE INSPECTION [13B-MSP].) • If there is any malfunction, replace the purge solenoid valve, then go to Step 17.
No	Go to the next step.
12	INSPECT ENGINE COMPRESSION • Inspect the engine compression. (See COMPRESSION INSPECTION [13B-MSP].) • Is there any malfunction?	Yes	Go to the next step.
No	Go to Step 17.
13	INSPECT METERING OIL PUMP • Inspect the metering oil pump. (See METERING OIL PUMP INSPECTION [13B-MSP].) • Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results. Overhaul or replace the engine, then go to Step 17.
No	Go to the next step.
14	INSPECT ENGINE OIL CONDITION • Inspect the engine oil condition. • Is the engine oil condition normal?	Yes	Go to the next step.
No	Replace the engine oil. Overhaul or replace the engine, then go to Step 17.
15	INSPECT OIL PRESSURE • Inspect the oil pressure. (See OIL PRESSURE INSPECTION [13B-MSP].) • Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results. Overhaul or replace the engine, then go to Step 17.
No	Go to the next step.
16	INSPECT OIL PASSAGE • Inspect the oil pipe between metering oil pump and metering oil nozzle. • Is there any malfunction?	Yes	Inspect and repair for leakage or clogging in the engine oil passage. Overhaul or replace the engine, then go to the next step.
No	Overhaul or replace the engine, then go to the next step.
17	VERIFY TROUBLESHOOTING OF DTC P2097 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. • Maintain the engine speed at 2,500—3,500 rpm for 15 s or more, then increase it to 4,500—5,000 rpm and maintain it for 15 s or more. • Idle the engine until the cooling fan stops, then maintain the engine idling for 60 s or more. • Is the PENDING CODE same as DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [13B-MSP].)
No	Go to the next step.
18	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [13B-MSP].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [13B-MSP].)
No	DTC troubleshooting completed.

STEP

INSPECTION

ACTION

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.

Record the FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS on the repair order, then go to the next step.

VERIFY RELATED SERVICE INFORMATION AVAILBAILITY

• Verify related Service information availability.

• Is any related Service information available?

Yes

Perform repair or diagnosis according to thavailable Service information.

• If the vehicle is not repaired, go to the next step.

Go to the next step.

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 P0172 also present?

Yes

Go to the DTC P0172 inspection.

(See DTC P0172 [13B-MSP].)

If misfire DTC is present or drivability concern exists, go to step 11.

If misfire DTC is not present and drivability concern does not exist, go to the next step.

IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA

• Is DTC P2097 on FREEZE FRAME DATA?

Yes

Go to the next step.

Go to the FREEZE FRAME DATA DTC inspection.

(See DTC TABLE [13B-MSP].)

INSPECT HO2S

• Inspect the HO2S.

(See HEATED OXYGEN SENSOR (HO2S) INSPECTION [13B-MSP].)

• Is there any malfunction?

Yes

Visually inspect for the gas leakage between TWC and HO2S.

• If there is no leakage, replace the HO2S, then go to Step 17.

(See HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [13B-MSP].)

Go to the next step.

VERIFY CURRENT INPUT SIGNAL STATUS

• Connect the M-MDS to the DLC-2.

• Verify the following PIDs.

(See PCM INSPECTION [13B-MSP].)

― APP

― ECT

― MAF

― TP REL

― VSS

• Are the PIDs normal?

Yes

Go to the next step.

Inspect the malfunctioning part according to the inspection results, then go to Step 17.

VERIFY CURRENT INPUT SIGNAL STATUS UNDER FREEZE FRAME DATA CONDITION

• Connect the M-MDS to the DLC-2.

• Verify the following PIDs under the FREEZE FRAME DATA condition.

(See PCM INSPECTION [13B-MSP].)

― APP

― ECT

― MAF

― TP REL

― VSS

• Are the PIDs normal?

Yes

Go to the next step.

Inspect the malfunctioning part according to the inspection results, then go to Step 17.

INSPECT A/F SENSOR

• Inspect the A/F sensor.

(See AIR FUEL RATIO (A/F) SENSOR INSPECTION [13B-MSP].)

• Is there any malfunction?

Yes

Inspect the following:

• Loose installation of A/F sensor

• Exhaust gas leakage between exhaust manifold and A/F sensor

If there is no malfunction detected, replace the A/F sensor.

(See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [13B-MSP].)

If there is a malfunction detected, repair or replace the malfunctioning part.

Then go to Step 17.

Go to the next step.

INSPECT FUEL PUMP SPEED CONTROL OPERATION

• Perform the “Fuel Pump Speed Control Operation Inspection”.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [13B-MSP].)

• Is there any malfunction?

Yes

Repair or replace the malfunctioning part according to the inspection results, then go to Step 17.

Go to the next step.

INSPECT FUEL LINE PRESSURE

• Perform the “FUEL LINE PRESSURE INSPECTION”.

(See FUEL LINE PRESSURE INSPECTION [13B-MSP].)

• Is there any malfunction?

Yes

• If the fuel line pressure is too low, go to the next step.

• If the fuel line pressure is too high, replace the fuel pump unit, then go to Step 17.

(See FUEL PUMP UNIT REMOVAL/INSTALLATION [13B-MSP].)

Go to Step 12.

INSPECT LONG TERM FUEL TRIM

• Connect the M-MDS to the DLC-2.

• Access the 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 solenoid valve.

(See PURGE SOLENOID VALVE INSPECTION [13B-MSP].)

• If there is any malfunction, replace the purge solenoid valve, then go to Step 17.

Go to the next step.

INSPECT ENGINE COMPRESSION

• Inspect the engine compression.

(See COMPRESSION INSPECTION [13B-MSP].)

• Is there any malfunction?

Yes

Go to the next step.

Go to Step 17.

INSPECT METERING OIL PUMP

• Inspect the metering oil pump.

(See METERING OIL PUMP INSPECTION [13B-MSP].)

• Is there any malfunction?

Yes

Repair or replace the malfunctioning part according to the inspection results.

Overhaul or replace the engine, then go to Step 17.

Go to the next step.

INSPECT ENGINE OIL CONDITION

• Inspect the engine oil condition.

• Is the engine oil condition normal?

Yes

Go to the next step.

Replace the engine oil.

Overhaul or replace the engine, then go to Step 17.

INSPECT OIL PRESSURE

• Inspect the oil pressure.

(See OIL PRESSURE INSPECTION [13B-MSP].)

• Is there any malfunction?

Yes

Repair or replace the malfunctioning part according to the inspection results.

Overhaul or replace the engine, then go to Step 17.

Go to the next step.

INSPECT OIL PASSAGE

• Inspect the oil pipe between metering oil pump and metering oil nozzle.

• Is there any malfunction?

Yes

Inspect and repair for leakage or clogging in the engine oil passage.

Overhaul or replace the engine, then go to the next step.

VERIFY TROUBLESHOOTING OF DTC P2097 COMPLETED

• Make sure to reconnect all disconnected connectors.

• Clear the DTC from the PCM memory using the M-MDS.

• Maintain the engine speed at 2,500—3,500 rpm for 15 s or more, then increase it to 4,500—5,000 rpm and maintain it for 15 s or more.

• Idle the engine until the cooling fan stops, then maintain the engine idling for 60 s or more.

• Is the PENDING CODE same as DTC present?

Yes

Replace the PCM, then go to the next step.

(See PCM REMOVAL/INSTALLATION [13B-MSP].)

Go to the next step.

VERIFY AFTER REPAIR PROCEDURE

• Perform the “AFTER REPAIR PROCEDURE”.

(See AFTER REPAIR PROCEDURE [13B-MSP].)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [13B-MSP].)

DTC troubleshooting completed.