DTC P2196

BHE010202100W16

DTC P2196

Front HO2S signal stuck rich

DETECTION CONDITION

• The PCM monitors the front HO2S output current when the following conditions are met. If the average output current is less than 0.8 A for 25 s, the PCM determines that the front HO2S signal remains rich.
MONITORING CONDITION
– ECT: more than 70 °C {158 °F}
– Engine speed: 1,000-3,200 rpm
– MAF amount: 6-80 g/s {0.80-10.58 lb/min}
– Target A/F feedback system status: feedback control
– Input voltage from the rear HO2S: less than 0.2 V

Diagnostic support note

• This is an intermittent monitor (HO2S).
• 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

• Front HO2S malfunction
• Fuel injector malfunction
• Fuel line pressure malfunction
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1

VERIFY FREEZE FRAME DATA HAS BEEN RECORDED

• Has FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2

VERIFY RELATED REPAIR INFORMATION AVAILABILITY

• Verify related service repair information availability.
• Is any related repair information available?
Yes
Perform repair or diagnosis according to the available repair 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.
• Are other DTCs present?
Yes
Go to the appropriate DTC inspection.
(See DTC TABLE.)
No
Go to the next step.
4

IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA

• Is DTC P2196 on FREEZE FRAME DATA?
Yes
Go to the next step.
No
Go to the FREEZE FRAME DATA DTC inspection.
(See DTC TABLE.)
5

VERIFY CURRENT INPUT SIGNAL STATUS

• Connect the WDS or equivalent to the DLC-2.
• Verify the following PIDs.
– ECT
– MAF
– O2S12
– RPM
• Are the PIDs normal?
Yes
Go to the next step.
No
Inspect the malfunctioning part according to the inspection results.
Then go to Step 10.
6

VERIFY CURRENT INPUT SIGNAL STATUS UNDER FREEZE FRAME DATA CONDITION

• Connect the WDS or equivalent to the DLC-2.
• Verify the following PIDs under the FREEZE FRAME DATA condition.
– ECT
– MAF
– O2S12
– RPM
• Are the PIDs normal?
Yes
Go to the next step.
No
Inspect the malfunctioning part according to the inspection results.
Then go to Step 10.
7

INSPECT FRONT HO2S

• Inspect the front HO2S.
• Is there any malfunction?
Yes
Replace the front HO2S, then go to Step 10.
No
Go to the next step.
8

INSPECT FUEL INJECTOR

• Inspect the fuel injector.
• Is there any malfunction?
Yes
Replace the fuel injector, then go to Step 10.
No
Go to the next step.
9

INSPECT FUEL LINE PRESSURE

• Perform the "FUEL LINE PRESSURE INSPECTION".
• Is there any malfunction?
Yes
Inspect the malfunctioning part according to the inspection results.
Then go to the next step.
No
Go to the next step.
10

VERIFY TROUBLESHOOTING OF DTC P2196 COMPLETED

• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using the WDS or equivalent.
• Perform the DRIVE MODE 1 and 3.
• Is the PENDING CODE same as DTC present?
Yes
Replace the PCM, then go to the next step.
No
Go to the next step.
11

VERIFY AFTER REPAIR PROCEDURE

• Perform the "AFTER REPAIR PROCEDURE".
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE.)
No
DTC troubleshooting completed.