DTC P2097:00 [MZR 1.3, MZR 1.5]

DTC P2097:00	Target A/F feedback system too rich
DETECTION CONDITION	• If the fuel correction amount corresponding to the HO2S target voltage is lower than the specified value while performing HO2S feedback correction. 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.
POSSIBLE CAUSE	• HO2S malfunction ― HO2S looseness ― Exhaust system leakage (between TWC and HO2S) ― HO2S malfunction • IAT sensor malfunction • Erratic signal to PCM ― APP sensor signal malfunction ― ECT sensor signal malfunction ― MAF sensor signal malfunction ― TP sensor signal malfunction ― VSS signal malfunction ― Related connector or terminals malfunction ― Related wiring harness malfunction • A/F sensor malfunction ― A/F sensor looseness ― Exhaust system leakage (between exhaust manifold and A/F sensor) ― A/F sensor malfunction • Excessive fuel line pressure ― Pressure regulator malfunction (built-in fuel pump unit) • Improper operation of purge control system • Improper operation of fuel injector • Ignition system malfunction ― Spark plug malfunction • Insufficient engine compression • ECT sensor malfunction • PCM malfunction

DTC P2097:00

Target A/F feedback system too rich

DETECTION CONDITION

• If the fuel correction amount corresponding to the HO2S target voltage is lower than the specified value while performing HO2S feedback correction.

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.

POSSIBLE CAUSE

• HO2S malfunction

― HO2S looseness

― Exhaust system leakage (between TWC and HO2S)

― HO2S malfunction

• IAT sensor malfunction

• Erratic signal to PCM

― APP sensor signal malfunction

― ECT sensor signal malfunction

― MAF sensor signal malfunction

― TP sensor signal malfunction

― VSS signal malfunction

― Related connector or terminals malfunction

― Related wiring harness malfunction

• A/F sensor malfunction

― A/F sensor looseness

― Exhaust system leakage (between exhaust manifold and A/F sensor)

― A/F sensor malfunction

• Excessive fuel line pressure

― Pressure regulator malfunction (built-in fuel pump unit)

• Improper operation of purge control system

• Improper operation of fuel injector

• Ignition system malfunction

― Spark plug malfunction

• Insufficient engine compression

• ECT sensor malfunction

• PCM malfunction

STEP	INSPECTION	ACTION
1	IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA (MODE 2) • Perform the Freeze Frame PID Data Access Procedure. (See ON-BOARD DIAGNOSTIC TEST [MZR 1.3, MZR 1.5].) • Is the DTC P2097:00 on FREEZE FRAME DATA (Mode 2)?	Yes	Go to the next step.
No	Go to the troubleshooting procedure for DTC on FREEZE FRAME DATA (Mode 2). (See DTC TABLE [MZR 1.3, MZR 1.5].)
2	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?	Yes	Go to the next step.
No	Record the FREEZE FRAME DATA (Mode 2)/snapshot data and DIAGNOSTIC MONITORING TEST RESULTS on the repair order, then go to the next step.
3	VERIFY RELATED SERVICE 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.
4	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 [MZR 1.3, MZR 1.5].) • Are any other PENDING CODEs and/or DTCs present?	Yes	Go to the applicable PENDING CODE or DTC inspection. (See DTC TABLE [MZR 1.3, MZR 1.5].)
No	Go to the next step.
5	INSPECT INSTALLATION OF HO2S • Inspect installation of HO2S. • Is the HO2S installed securely?	Yes	Go to the next step.
No	Retighten the HO2S, then go to Step 21. (See HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [MZR 1.3, MZR 1.5].)
6	INSPECT CURRENT SIGNAL STATUS OF HO2S • Inspect the HO2S. (See HEATED OXYGEN SENSOR (HO2S) INSPECTION [MZR 1.3, MZR 1.5].) • Is there any malfunction?	Yes	Go to the next step.
No	Go to Step 8.
7	INSPECT FOR LEAKAGE FROM EXHAUST SYSTEM • Visually inspect for exhaust gas leakage between TWC and HO2S. • Is there any leakage?	Yes	Repair or replace the malfunctioning part according to the inspection results, then go to Step 21.
No	Replace the HO2S, then go to Step 21. (See HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [MZR 1.3, MZR 1.5].)
8	INSPECT IAT SENSOR • Inspect the IAT sensor. (See INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION [MZR 1.3, MZR 1.5].) • Is there any malfunction?	Yes	Replace the MAF/IAT sensor, then go to Step 21. (See MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REMOVAL/INSTALLATION [MZR 1.3, MZR 1.5].)
No	Go to the next step.
9	VERIFY CURRENT INPUT SIGNAL STATUS • Access the following PIDs using the M-MDS: (See ON-BOARD DIAGNOSTIC TEST [MZR 1.3, MZR 1.5].) ― APP1 ― APP2 ― ECT ― MAF ― TP REL ― VSS • Are all PIDs normal? (See PCM INSPECTION [MZR 1.3, MZR 1.5].)	Yes	Go to the next step.
No	Inspect the suspected sensor and related wiring harness. Repair or replace the malfunctioning part according to the inspection results, then go to Step 21.
10	VERIFY CURRENT INPUT SIGNAL STATUS UNDER FREEZE FRAME DATA (MODE 2) CONDITION Caution • While performing this step, always operate the vehicle in a safe and lawful manner. • When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later. • Access the same PIDs as in Step 9 while simulating under the FREEZE FRAME DATA (Mode 2) condition. (See ON-BOARD DIAGNOSTIC TEST [MZR 1.3, MZR 1.5].) • Are all PIDs normal? (See PCM INSPECTION [MZR 1.3, MZR 1.5].)	Yes	Go to the next step.
No	Inspect the suspected sensor and related wiring harness. Repair or replace the malfunctioning part according to the inspection results, then go to Step 21.
11	INSPECT INSTALLATION OF A/F SENSOR • Inspect installation of A/F sensor. • Is the A/F sensor installed securely?	Yes	Go to the next step.
No	Retighten the A/F sensor, then go to Step 21. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [MZR 1.3, MZR 1.5].)
12	INSPECT CURRENT SIGNAL STATUS OF A/F SENSOR • Inspect the A/F sensor. (See AIR FUEL RATIO (A/F) SENSOR INSPECTION [MZR 1.3, MZR 1.5].) • Is there any malfunction?	Yes	Go to the next step.
No	Go to Step 14.
13	INSPECT FOR LEAKAGE FROM EXHAUST SYSTEM • Visually inspect for exhaust gas leakage between exhaust manifold and A/F sensor. • Is there any leakage?	Yes	Repair or replace the malfunctioning part according to the inspection results, then go to Step 21.
No	Replace the A/F sensor, then go to Step 21. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [MZR 1.3, MZR 1.5].)
14	INSPECT FUEL LINE PRESSURE • Turn the ignition switch off. Note • If the engine will not start, inspect the fuel line pressure with ignition switches to ON. • Inspect the fuel line pressure with the engine is running. (See FUEL LINE PRESSURE INSPECTION [MZR 1.3, MZR 1.5].) • Is there any malfunction?	Yes	Replace the fuel pump unit, then go to Step 21. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZR 1.3, MZR 1.5].)
No	Go to the next step.
15	INSPECT LONG TERM FUEL TRIM • Access the LONGFT1 PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [MZR 1.3, MZR 1.5].) • Compare the LONGFT1 PID with recorded FREEZE FRAME DATA (Mode 2) at Step 2. • Is the LONGFT1 PID value above FREEZE FRAME DATA (Mode 2) value?	Yes	Go to the next step.
No	Go to Step 17.
16	INSPECT PURGE SOLENOID VALVE OPERATION • Perform the Purge Control System Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 1.3, MZR 1.5].) • Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results, then go to Step 21.
No	Go to the next step.
17	INSPECT FUEL INJECTOR OPERATION • Perform the Fuel Injector Operation Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 1.3, MZR 1.5].) • Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results, then go to Step 21.
No	Go to the next step.
18	INSPECT IGNITION SYSTEM OPERATION • Perform the Spark Test. (See.ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 1.3, MZR 1.5]) • Is a strong blue spark visible at each cylinder?	Yes	Go to the next step.
No	Repair or replace the malfunctioning part according to the inspection results, then go to Step 21.
19	INSPECT ENGINE COMPRESSION • Inspect the engine compression. (See COMPRESSION INSPECTION [MZR 1.3, MZR 1.5].) • Is there any malfunction?	Yes	Perform the engine overhaul for repairs, then go to Step 21.
No	Go to the next step.
20	INSPECT ECT SENSOR • Inspect the ECT sensor. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [MZR 1.3, MZR 1.5].) • Is there any malfunction?	Yes	Replace the ECT sensor, then go to the next step. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [MZR 1.3, MZR 1.5].)
No	Go to the next step.
21	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 [MZR 1.3, MZR 1.5].) • Perform the Drive Mode 01 (PCM Adaptive Memory Produce Drive Mode). (See OBD DRIVE MODE [MZR 1.3, MZR 1.5].) • Is the PENDING CODE for this DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [MZR 1.3, MZR 1.5].) Go to the next step.
No	Go to the next step.
22	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [MZR 1.3, MZR 1.5].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZR 1.3, MZR 1.5].)
No	DTC troubleshooting completed.

STEP

INSPECTION

ACTION

IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA (MODE 2)

• Perform the Freeze Frame PID Data Access Procedure.

(See ON-BOARD DIAGNOSTIC TEST [MZR 1.3, MZR 1.5].)

• Is the DTC P2097:00 on FREEZE FRAME DATA (Mode 2)?

Yes

Go to the next step.

Go to the troubleshooting procedure for DTC on FREEZE FRAME DATA (Mode 2).

(See DTC TABLE [MZR 1.3, MZR 1.5].)

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?

Yes

Go to the next step.

Record the FREEZE FRAME DATA (Mode 2)/snapshot data and DIAGNOSTIC MONITORING TEST RESULTS on the repair order, then go to the next step.

VERIFY RELATED SERVICE 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.

Go to the next step.

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 [MZR 1.3, MZR 1.5].)

• Are any other PENDING CODEs and/or DTCs present?

Yes

Go to the applicable PENDING CODE or DTC inspection.

(See DTC TABLE [MZR 1.3, MZR 1.5].)

Go to the next step.

INSPECT INSTALLATION OF HO2S

• Inspect installation of HO2S.

• Is the HO2S installed securely?

Yes

Go to the next step.

Retighten the HO2S, then go to Step 21.

(See HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [MZR 1.3, MZR 1.5].)

INSPECT CURRENT SIGNAL STATUS OF HO2S

• Inspect the HO2S.

(See HEATED OXYGEN SENSOR (HO2S) INSPECTION [MZR 1.3, MZR 1.5].)

• Is there any malfunction?

Yes

Go to the next step.

Go to Step 8.

INSPECT FOR LEAKAGE FROM EXHAUST SYSTEM

• Visually inspect for exhaust gas leakage between TWC and HO2S.

• Is there any leakage?

Yes

Repair or replace the malfunctioning part according to the inspection results, then go to Step 21.

Replace the HO2S, then go to Step 21.

(See HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [MZR 1.3, MZR 1.5].)

INSPECT IAT SENSOR

• Inspect the IAT sensor.

(See INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION [MZR 1.3, MZR 1.5].)

• Is there any malfunction?

Yes

Replace the MAF/IAT sensor, then go to Step 21.

(See MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REMOVAL/INSTALLATION [MZR 1.3, MZR 1.5].)

Go to the next step.

VERIFY CURRENT INPUT SIGNAL STATUS

• Access the following PIDs using the M-MDS:

(See ON-BOARD DIAGNOSTIC TEST [MZR 1.3, MZR 1.5].)

― APP1

― APP2

― ECT

― MAF

― TP REL

― VSS

• Are all PIDs normal?

(See PCM INSPECTION [MZR 1.3, MZR 1.5].)

Yes

Go to the next step.

Inspect the suspected sensor and related wiring harness.

Repair or replace the malfunctioning part according to the inspection results, then go to Step 21.

VERIFY CURRENT INPUT SIGNAL STATUS UNDER FREEZE FRAME DATA (MODE 2) CONDITION

Caution

• While performing this step, always operate the vehicle in a safe and lawful manner.

• When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later.

• Access the same PIDs as in Step 9 while simulating under the FREEZE FRAME DATA (Mode 2) condition.

(See ON-BOARD DIAGNOSTIC TEST [MZR 1.3, MZR 1.5].)

• Are all PIDs normal?

(See PCM INSPECTION [MZR 1.3, MZR 1.5].)

Yes

Go to the next step.

Inspect the suspected sensor and related wiring harness.

Repair or replace the malfunctioning part according to the inspection results, then go to Step 21.

INSPECT INSTALLATION OF A/F SENSOR

• Inspect installation of A/F sensor.

• Is the A/F sensor installed securely?

Yes

Go to the next step.

Retighten the A/F sensor, then go to Step 21.

(See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [MZR 1.3, MZR 1.5].)

INSPECT CURRENT SIGNAL STATUS OF A/F SENSOR

• Inspect the A/F sensor.

(See AIR FUEL RATIO (A/F) SENSOR INSPECTION [MZR 1.3, MZR 1.5].)

• Is there any malfunction?

Yes

Go to the next step.

Go to Step 14.

INSPECT FOR LEAKAGE FROM EXHAUST SYSTEM

• Visually inspect for exhaust gas leakage between exhaust manifold and A/F sensor.

• Is there any leakage?

Yes

Repair or replace the malfunctioning part according to the inspection results, then go to Step 21.

Replace the A/F sensor, then go to Step 21.

(See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [MZR 1.3, MZR 1.5].)

INSPECT FUEL LINE PRESSURE

• Turn the ignition switch off.

Note

• If the engine will not start, inspect the fuel line pressure with ignition switches to ON.

• Inspect the fuel line pressure with the engine is running.

(See FUEL LINE PRESSURE INSPECTION [MZR 1.3, MZR 1.5].)

• Is there any malfunction?

Yes

Replace the fuel pump unit, then go to Step 21.

(See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZR 1.3, MZR 1.5].)

Go to the next step.

INSPECT LONG TERM FUEL TRIM

• Access the LONGFT1 PID using the M-MDS.

(See ON-BOARD DIAGNOSTIC TEST [MZR 1.3, MZR 1.5].)

• Compare the LONGFT1 PID with recorded FREEZE FRAME DATA (Mode 2) at Step 2.

• Is the LONGFT1 PID value above FREEZE FRAME DATA (Mode 2) value?

Yes

Go to the next step.

Go to Step 17.

INSPECT PURGE SOLENOID VALVE OPERATION

• Perform the Purge Control System Inspection.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 1.3, MZR 1.5].)

• Is there any malfunction?

Yes

Repair or replace the malfunctioning part according to the inspection results, then go to Step 21.

Go to the next step.

INSPECT FUEL INJECTOR OPERATION

• Perform the Fuel Injector Operation Inspection.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 1.3, MZR 1.5].)

• Is there any malfunction?

Yes

Repair or replace the malfunctioning part according to the inspection results, then go to Step 21.

Go to the next step.

INSPECT IGNITION SYSTEM OPERATION

• Perform the Spark Test.

(See.ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 1.3, MZR 1.5])

• Is a strong blue spark visible at each cylinder?

Yes

Go to the next step.

Repair or replace the malfunctioning part according to the inspection results, then go to Step 21.

INSPECT ENGINE COMPRESSION

• Inspect the engine compression.

(See COMPRESSION INSPECTION [MZR 1.3, MZR 1.5].)

• Is there any malfunction?

Yes

Perform the engine overhaul for repairs, then go to Step 21.

Go to the next step.

INSPECT ECT SENSOR

• Inspect the ECT sensor.

(See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [MZR 1.3, MZR 1.5].)

• Is there any malfunction?

Yes

Replace the ECT sensor, then go to the next step.

(See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [MZR 1.3, MZR 1.5].)

Go to the next step.

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 [MZR 1.3, MZR 1.5].)

• Perform the Drive Mode 01 (PCM Adaptive Memory Produce Drive Mode).

(See OBD DRIVE MODE [MZR 1.3, MZR 1.5].)

• Is the PENDING CODE for this DTC present?

Yes

Repeat the inspection from Step 1.

• If the malfunction recurs, replace the PCM.

(See PCM REMOVAL/INSTALLATION [MZR 1.3, MZR 1.5].)

Go to the next step.

VERIFY AFTER REPAIR PROCEDURE

• Perform the “AFTER REPAIR PROCEDURE”.

(See AFTER REPAIR PROCEDURE [MZR 1.3, MZR 1.5].)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [MZR 1.3, MZR 1.5].)

DTC troubleshooting completed.