DTC P2097:00 [L5]SM2444243
DTC P2097:00 [L5]

id0102c9707600

DTC P2097:00

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 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
― Looseness HO2S
― HO2S malfunction
• IAT sensor malfunction
• Erratic signal to PCM
― ECT sensor signal malfunction
― MAF sensor signal malfunction
― TP sensor signal malfunction
― VSS signal malfunction
• A/F sensor malfunction
― Looseness A/F sensor
― A/F sensor malfunction
• Fuel supply system malfunction or improper fuel line pressure
― Pressure regulator malfunction
― Fuel pump unit malfunction
― Fuel leakage on fuel line from fuel distributor and fuel pump
― Fuel filter clogged or restricted
― Fuel return hose clogged
• Purge solenoid valve malfunction
• Ignition system malfunction
― Ignition coil related wiring harness malfunction
• Improper operation of fuel injector
• Insufficient engine compression
• ECT sensor malfunction
• PCM malfunction

Diagnostic procedure

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 [L5].)
• 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 [L5].)
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 [L5].)
• Are any other PENDING CODEs and/or DTCs present?
Yes
Go to the applicable PENDING CODE or DTC inspection.
(See DTC TABLE [L5].)
No
Go to the next step.
5
INSPECT INSTALLATION OF HO2S
• Inspect if the HO2S is loosely installed.
• Is the HO2S installed securely?
Yes
Go to the next step.
No
Retighten the HO2S, then go to Step 20.
(See HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [L5].)
6
INSPECT HO2S
• Inspect the HO2S. (See HEATED OXYGEN SENSOR (HO2S) INSPECTION [L5].)
• Is there any malfunction?
Yes
Replace the HO2S, then go to Step 20.
(See HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [L5].)
No
Go to the next step.
7
INSPECT IAT SENSOR
• Turn the ignition switch off.
• Inspect the IAT sensor. (See INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION [L5].)
• Is there any malfunction?
Yes
Replace the MAF/IAT sensor, then go to Step 20.
(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [L5].)
No
Go to the next step.
8
VERIFY CURRENT INPUT SIGNAL STATUS
• Access the following PIDs using the M-MDS: (See ON-BOARD DIAGNOSTIC TEST [L5].)
― ECT
― MAF
― TP REL
― VSS
• Are all PIDs normal? (See PCM INSPECTION [L5].)
Yes
Go to the next step.
No
Repair or replace the malfunctioning part according to the inspection results, then go to Step 20.
9
VERIFY CURRENT INPUT SIGNAL STATUS UNDER FREEZE FRAME DATA (MODE 2) CONDITION
• Access the same PIDs as in Step 8 under the FREEZE FRAME DATA (Mode 2) conditions. (See ON-BOARD DIAGNOSTIC TEST [L5].)
• Are all PIDs normal? (See PCM INSPECTION [L5].)
Yes
Go to the next step.
No
Repair or replace the malfunctioning part according to the inspection results, then go to Step 20.
10
INSPECT INSTALLATION OF A/F SENSOR
• Inspect if the A/F sensor is loosely installed.
• Is the A/F sensor installed securely?
Yes
Go to the next step.
No
Retighten the A/F sensor, then go to Step 20.
(See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [L5].)
11
INSPECT A/F SENSOR
• Inspect the A/F sensor. (See AIR FUEL RATIO (A/F) SENSOR INSPECTION [L5].)
• Is there any malfunction?
Yes
Replace the A/F sensor, then go to Step 20.
(See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [L5].)
No
Go to the next step.
12
INSPECT FUEL LINE PRESSURE
• Turn the ignition switch off.
Note
• If the engine will not start, inspect the fuel line pressure with the ignition switch turn to the ON position.
• Inspect the fuel line pressure while the engine running. (See FUEL LINE PRESSURE INSPECTION [L5].)
• Is there any malfunction?
Yes
If fuel pressure is too high:
• Replace the fuel pump unit, then go to Step 20. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [L5].)
If fuel pressure is low:
• Go to the next step.
No
Go to Step 14.
13
INSPECT FUEL LINE LEAKAGE
• Visually inspect the fuel line from fuel pump to fuel distributor.
• Is there any leakage?
Yes
Repair or replace the malfunctioning part according to the inspection results, then go to Step 20.
No
Inspect the low-pressure side fuel filter for foreign materials or stain inside fuel filter.
• If foreign materials or stain is found inside fuel filter (low-pressure side):
― Clean of fuel tank and filter.
• If foreign materials or stain is not found:
― Replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [L5].)
Go to Step 20.
14
INSPECT LONG TERM FUEL TRIM
• Access the LONGFT1 PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [L5].)
• 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 16.
15
INSPECT PURGE SOLENOID VALVE
• Turn the ignition switch off.
• Inspect the purge solenoid valve. (See PURGE SOLENOID VALVE INSPECTION [L5].)
• Is there any malfunction?
Yes
Replace the purge solenoid valve, then go to Step 20.
(See PURGE SOLENOID VALVE REMOVAL/INSTALLATION [L5].)
No
Go to the next step.
16
INSPECT IGNITION SYSTEM OPERATION
• Perform the Spark Test. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L5].)
• 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 20.
17
INSPECT FUEL INJECTOR OPERATION
• Perform the Fuel Injector Operation Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L5].)
• Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results, then go to Step 20.
No
Go to the next step.
18
INSPECT ENGINE COMPRESSION
• Inspect the engine compression. (See COMPRESSION INSPECTION [L5].)
• Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results, then go to Step 20.
No
Go to the next step.
19
INSPECT ECT SENSOR
• Inspect the ECT sensor. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [L5].)
• Is there any malfunction?
Yes
Replace the ECT sensor, then go to the next step.
(See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [L5].)
No
Go to the next step.
20
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 [L5].)
• Drive the vehicle under the FREEZE FRAME DATA (Mode 2) conditions.
• Perform the Pending Trouble Code Access Procedure. (See ON-BOARD DIAGNOSTIC TEST [L5].)
• Is the PENDING CODE for this DTC present?
Yes
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [L5].)
No
Go to the next step.
21
VERIFY AFTER REPAIR PROCEDURE
• Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [L5].)
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [L5].)
No
DTC troubleshooting completed.