DTC P2097:00 [ZJ, ZY]


id0102c0707600

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 is available.
•  The DTC is stored in the PCM memory.
POSSIBLE CAUSE
•  HO2S malfunction
―  Leakage exhaust gas
―  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
―  Leakage exhaust gas
―  A/F sensor malfunction
•  Excessive fuel line pressure
―  Pressure regulator (built-in fuel pump unit) malfunction
•  Improper operation of purge control system
•  Ignition system malfunction
―  Ignition coil and related wiring harness malfunction
―  Spark plug malfunction
•  Improper operation of fuel injector
•  Insufficient engine compression
•  ECT sensor malfunction
•  PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED
•  Have the 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 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.
3
VERIFY RELATED PENDING CODE AND STORED DTC
•  Turn the ignition switch off, then to the ON position (engine off).
•  Verify the related PENDING CODE and stored DTCs using the M-MDS.
•  Is the DTC P2178:00 or P2188:00 also present?
Yes
Go to the applicable DTC inspection.
No
Go to the next step.
4
IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA
•  Is the DTC P2097:00 on FREEZE FRAME DATA?
Yes
Go to the next step.
No
Go to the troubleshooting procedures for DTC on FREEZE FRAME DATA.
5
INSPECT HO2S
•  Inspect the HO2S.
•  Is there any malfunction?
Yes
Go to the next step.
No
Go to Step 7.
6
INSPECT GAS LEAKAGE FROM EXHAUST SYSTEM
•  Visually inspect if there is exhaust gas leakage between the TWC and HO2S.
•  Is there gas leakage?
Yes
Repair or replace the malfunctioning part according to the inspection results, then go to Step 20.
No
Replace the HO2S, then go to Step 20.
7
INSPECT IAT SENSOR
•  Inspect the IAT sensor.
•  Is there any malfunction?
Yes
Replace the MAF/IAT sensor, then go to Step 20.
No
Go to the next step.
8
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:
―  APP
―  ECT
―  MAF
―  TP REL
―  VSS
•  Are all PIDs normal?
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 CONDITION
•  Perform the PID/DATA Monitor and Record Procedure and access the same PIDs as in Step 8 under the FREEZE FRAME DATA condition.
•  Are all PIDs normal?
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 A/F SENSOR
•  Inspect the A/F sensor.
•  Is there any malfunction?
Yes
Go to the next step.
No
Go to Step 12.
11
INSPECT GAS LEAKAGE FROM EXHAUST SYSTEM
•  Visually inspect if there is exhaust gas leakage between the exhaust manifold and A/F sensor.
•  Is there gas leakage?
Yes
Repair or replace the malfunctioning part according to the inspection results, then go to Step 20.
No
Replace the A/F sensor, then go to Step 20.
12
INSPECT FUEL LINE PRESSURE
•  Perform the ”FUEL LINE PRESSURE INSPECTION”.
•  Is there any malfunction?
Yes
Replace the fuel pump unit, then go to Step 20.
No
Go to the next step.
13
INSPECT LONG TERM FUEL TRIM
•  Connect the M-MDS to the DLC-2.
•  Perform the PID/DATA Monitor and Record Procedure and access the LONGFT1 PID.
•  Compare the LONGFT1 PID with recorded FREEZE FRAME DATA at Step 1.
•  Is the LONGFT1 PID above the FREEZE FRAME DATA?
Yes
Go to the next step.
No
Go to Step 15.
14
INSPECT PURGE SOLENOID VALVE OPERATION
•  Perform the Purge Control System Inspection.
•  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.
15
INSPECT IGNITION COIL AND RELATED WIRING HARNESS
•  Inspect the ignition coil and related wiring harness condition (intermittent open or short circuit) for all cylinders.
•  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.
16
INSPECT IGNITION SYSTEM OPERATION
•  Perform the Spark Test.
•  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 20.
17
INSPECT FUEL INJECTOR OPERATION
•  Perform the Fuel Injector Operation Inspection.
•  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 20.
18
INSPECT ENGINE COMPRESSION
•  Inspect the engine compression.
•  Is there any malfunction?
Yes
Implement engine overhaul for repairs, then go to Step 20.
No
Go to the next step.
19
INSPECT ECT SENSOR
•  Is there any malfunction?
Yes
Replace the ECT sensor, then go to the next step.
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.
•  Perform the Drive Mode 01 (PCM Adaptive Memory Produce Drive Mode).
•  Is the PENDING CODE for this DTC present?
Yes
Replace the PCM, then go to the next step.
No
Go to the next step.
21
VERIFY AFTER REPAIR PROCEDURE
•  Perform the “AFTER REPAIR PROCEDURE”.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
DTC troubleshooting completed.