DTC P2097:00 [MZR 1.6]

DTC P2097:00	Target A/F feedback system too rich
DETECTION CONDITION	• The PCM monitors the target A/F fuel trim while under the target A/F feedback control. If the fuel trim is less 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 check engine light 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. • DTC is stored in the PCM memory.
POSSIBLE CAUSE	• 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 • A/F sensor malfunction • Excessive fuel line pressure ― Pressure regulator (built-in fuel pump unit) malfunction • Improper operation of purge control system ― Purge solenoid valve malfunction • Ignition system malfunction ― Ignition coil malfunction ― Ignition coil related wiring harness malfunction ― Spark plug malfunction • Fuel injector improper operation ― Fuel injector related wiring harness malfunction ― Fuel injector malfunction • Insufficient engine compression • ECT sensor malfunction • PCM malfunction

DTC P2097:00

Target A/F feedback system too rich

DETECTION CONDITION

• The PCM monitors the target A/F fuel trim while under the target A/F feedback control. If the fuel trim is less 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 check engine light 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.

• DTC is stored in the PCM memory.

POSSIBLE CAUSE

• 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

• A/F sensor malfunction

• Excessive fuel line pressure

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

• Improper operation of purge control system

― Purge solenoid valve malfunction

• Ignition system malfunction

― Ignition coil malfunction

― Ignition coil related wiring harness malfunction

― Spark plug malfunction

• Fuel injector improper operation

― Fuel injector related wiring harness malfunction

― Fuel injector 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 1.6].) • Is the DTC P2097:00 on FREEZE FRAME DATA (Mode 2)?	Yes	Go to the next step.
No	Go to the troubleshooting procedures for DTC on FREEZE FRAME DATA (Mode 2). (See DTC TABLE [MZR 1.6].)
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 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 STORED DTC • Switch the ignition off, then ON (engine off). • Verify the related PENDING CODE and stored DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [MZR 1.6].) • Are any other DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZR 1.6].)
No	Go to the next step.
5	INSPECT HO2S • Inspect the HO2S. (See HEATED OXYGEN SENSOR (HO2S) INSPECTION [MZR 1.6].) • Is there any malfunction?	Yes	Replace the HO2S, then go to Step 17. (See HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [MZR 1.6].)
No	Go to the next step.
6	INSPECT IAT SENSOR • Inspect the IAT sensor. (See INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION [MZR 1.6].) • Is there any malfunction?	Yes	Replace the MAF/IAT sensor, then go to Step 17. (See MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REMOVAL/INSTALLATION [MZR 1.6].)
No	Go to the next step.
7	VERIFY CURRENT INPUT SIGNAL STATUS • Connect the M-MDS to the DLC-2. • Perform the PID/DATA Monitor and Record Procedure and access the following PIDs using the M-MDS: (See ON-BOARD DIAGNOSTIC TEST [MZR 1.6].) ― APP1 ― APP2 ― ECT ― MAF ― TP REL ― VSS • Are all PIDs normal? (See PCM INSPECTION [MZR 1.6].)	Yes	Go to the next step.
No	Repair or replace the malfunctioning part according to the inspection results, then go to Step 17.
8	VERIFY CURRENT INPUT SIGNAL STATUS UNDER FREEZE FRAME DATA (MODE 2) CONDITION • Perform the PID/DATA Monitor and Record Procedure and access the same PIDs as in Step 7 under the FREEZE FRAME DATA (Mode 2) condition. (See ON-BOARD DIAGNOSTIC TEST [MZR 1.6].) • Are all PIDs normal? (See PCM INSPECTION [MZR 1.6].)	Yes	Go to the next step.
No	Repair or replace the malfunctioning part according to the inspection results, then go to Step 17.
9	INSPECT A/F SENSOR • Inspect the A/F sensor. (See AIR FUEL RATIO (A/F) SENSOR INSPECTION [MZR 1.6].) • Is there any malfunction?	Yes	Replace the A/F sensor, then go to Step 17. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [MZR 1.6].)
No	Go to the next step.
10	INSPECT FUEL LINE PRESSURE • Perform the “FUEL LINE PRESSURE INSPECTION”. (See FUEL LINE PRESSURE INSPECTION [MZR 1.6].) • Is there any malfunction?	Yes	Replace the fuel pump unit, then go to Step 17. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZR 1.6].)
No	Go to the next step.
11	INSPECT LONG TERM FUEL TRIM • Perform the PID/DATA Monitor and Record Procedure and access the LONGFT1 PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [MZR 1.6].) 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. • Drive the vehicle under the snapshot data condition. • Compare the LONGFT1 PID with recorded snapshot data at Step 2. • Is the LONGFT1 PID above the snapshot data value?	Yes	Go to the next step.
No	Go to Step 13.
12	INSPECT PURGE SOLENOID VALVE OPERATION • Perform the Purge Control System Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 1.6].) • 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.
13	INSPECT IGNITION SYSTEM OPERATION • Carry out the spark test. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 1.6].) • Is the 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 17.
14	INSPECT FUEL INJECTOR OPERATION • Perform the Fuel Injector Operation Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 1.6].) • Does the fuel injector work properly?	Yes	Go to the next step.
No	Repair or replace the malfunctioning part according to the inspection results, then go to Step 17. (See FUEL INJECTOR REMOVAL/INSTALLATION [MZR 1.6].)
15	INSPECT ENGINE COMPRESSION • Inspect the engine compression. (See COMPRESSION INSPECTION [MZR 1.6].) • Is there any malfunction?	Yes	Repair or replace the malfunctioning parts according to the inspection results, then go to Step 17.
No	Go to the next step.
16	INSPECT ECT SENSOR • Inspect the ECT sensor. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [MZR 1.6].) • Is there any malfunction?	Yes	Replace the ECT sensor, then go to the next step. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [MZR 1.6].)
No	Go to the next step.
17	VERIFY DTC TROUBLESHOOTING COMPLETED • Always reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE [MZR 1.6].) • Perform the Drive Mode 01 (PCM Adaptive Memory Produce Drive Mode). (See OBD DRIVE MODE [MZR 1.6].) • 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 1.6].) Go to the next step.
No	Go to the next step.
18	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [MZR 1.6].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZR 1.6].)
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 1.6].)

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

Yes

Go to the next step.

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

(See DTC TABLE [MZR 1.6].)

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 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 STORED DTC

• Switch the ignition off, then ON (engine off).

• Verify the related PENDING CODE and stored DTCs using the M-MDS.

(See ON-BOARD DIAGNOSTIC TEST [MZR 1.6].)

• Are any other DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [MZR 1.6].)

Go to the next step.

INSPECT HO2S

• Inspect the HO2S.

(See HEATED OXYGEN SENSOR (HO2S) INSPECTION [MZR 1.6].)

• Is there any malfunction?

Yes

Replace the HO2S, then go to Step 17.

(See HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [MZR 1.6].)

Go to the next step.

INSPECT IAT SENSOR

• Inspect the IAT sensor.

(See INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION [MZR 1.6].)

• Is there any malfunction?

Yes

Replace the MAF/IAT sensor, then go to Step 17.

(See MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REMOVAL/INSTALLATION [MZR 1.6].)

Go to the next step.

VERIFY CURRENT INPUT SIGNAL STATUS

• Connect the M-MDS to the DLC-2.

• Perform the PID/DATA Monitor and Record Procedure and access the following PIDs using the M-MDS:

(See ON-BOARD DIAGNOSTIC TEST [MZR 1.6].)

― APP1

― APP2

― ECT

― MAF

― TP REL

― VSS

• Are all PIDs normal?

(See PCM INSPECTION [MZR 1.6].)

Yes

Go to the next step.

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

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

• Perform the PID/DATA Monitor and Record Procedure and access the same PIDs as in Step 7 under the FREEZE FRAME DATA (Mode 2) condition.

(See ON-BOARD DIAGNOSTIC TEST [MZR 1.6].)

• Are all PIDs normal?

(See PCM INSPECTION [MZR 1.6].)

Yes

Go to the next step.

Repair or replace 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 [MZR 1.6].)

• Is there any malfunction?

Yes

Replace the A/F sensor, then go to Step 17.

(See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [MZR 1.6].)

Go to the next step.

INSPECT FUEL LINE PRESSURE

• Perform the “FUEL LINE PRESSURE INSPECTION”.

(See FUEL LINE PRESSURE INSPECTION [MZR 1.6].)

• Is there any malfunction?

Yes

Replace the fuel pump unit, then go to Step 17.

(See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZR 1.6].)

Go to the next step.

INSPECT LONG TERM FUEL TRIM

• Perform the PID/DATA Monitor and Record Procedure and access the LONGFT1 PID using the M-MDS.

(See ON-BOARD DIAGNOSTIC TEST [MZR 1.6].)

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.

• Drive the vehicle under the snapshot data condition.

• Compare the LONGFT1 PID with recorded snapshot data at Step 2.

• Is the LONGFT1 PID above the snapshot data value?

Yes

Go to the next step.

Go to Step 13.

INSPECT PURGE SOLENOID VALVE OPERATION

• Perform the Purge Control System Inspection.

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 1.6].)

• Is there any malfunction?

Yes

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