DTC P2196 [L8, LF]

id0102b1812800

DTC P2196

A/F sensor signal stuck rich

DETECTION CONDITION

•  The PCM monitors the A/F sensor output current when the following conditions are met. If the average output is less than 0.85 for 25 s, the PCM determines that the A/F sensor signal remains rich.

MONITORING CONDITIONS

―  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

―  Output voltage from the HO2S: less than 0.7 V

Diagnostic support note

•  This is an intermittent monitor (A/F sensor, 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 (Mode 2/Mode 12) is available.

•  The DTC is stored in the PCM memory.

POSSIBLE CAUSE

•  A/F sensor heater malfunction

•  A/F sensor malfunction

―  Exhaust system leakage

―  A/F sensor deterioration

•  MAF sensor malfunction

•  Improper operation of fuel injector

•  Fuel supply system malfunction or improper fuel line malfunction

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

―  Fuel pump unit malfunction

•  PCM malfunction

DTC P2196	A/F sensor signal stuck rich
DETECTION CONDITION	• The PCM monitors the A/F sensor output current when the following conditions are met. If the average output is less than 0.85 for 25 s, the PCM determines that the A/F sensor signal remains rich. MONITORING CONDITIONS ― 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 ― Output voltage from the HO2S: less than 0.7 V Diagnostic support note • This is an intermittent monitor (A/F sensor, 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 (Mode 2/Mode 12) is available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE	• A/F sensor heater malfunction • A/F sensor malfunction ― Exhaust system leakage ― A/F sensor deterioration • MAF sensor malfunction • Improper operation of fuel injector • Fuel supply system malfunction or improper fuel line malfunction ― Pressure regulator (built-in fuel pump unit) malfunction ― Fuel pump unit malfunction • PCM malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA (MODE 12) AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED • Have the FREEZE FRAME DATA (Mode 12) and DIAGNOSTIC MONITORING TEST RESULTS (A/F sensor, HO2S related) been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA (Mode 12) and DIAGNOSTIC MONITORING TEST RESULTS on 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.
2		No	Go to the next step.
3	VERIFY RELATED PENDING CODE AND STORED DTC • Turn the ignition switch off, then ON position (engine off). • Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST [L8, LF].) • Is the DTC P2178 or P2188 also present?	Yes	Go to the applicable DTC troubleshooting. (See DTC P2178 [L8, LF].) (See DTC P2188 [L8, LF].)
3		No	Go to the next step.
4	IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA (MODE 2) • Perform the Freeze Frame PID Data Access Procedure. (See ON-BOARD DIAGNOSTIC TEST [L8, LF].) • Is the DTC P2196 on FREEZE FRAME DATA (Mode 2)?	Yes	Go to the next step.
4		No	Go to the DTC troubleshooting on FREEZE FRAME DATA (Mode 2). (See DTC TABLE [L8, LF].)
5	INSPECT A/F SENSOR HEATER • Inspect the A/F sensor heater. (See AIR FUEL RATIO (A/F) SENSOR INSPECTION [L8, LF].) • Is there any malfunction?	Yes	Replace the A/F sensor, then go to Step 11. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [L8, LF].)
5		No	Go to the next step.
6	INSPECT A/F SENSOR • Inspect the A/F sensor. (See AIR FUEL RATIO (A/F) SENSOR INSPECTION [L8, LF].) • Is there any malfunction?	Yes	Go to the next step.
6		No	Go to Step 8.
7	INSPECT EXHAUST GAS LEAKAGE • Visually inspect if there is any gas leakage is found 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 11. (See EXHAUST SYSTEM REMOVAL/INSTALLATION [L8, LF].)
7		No	Replace the A/F sensor, then go to Step 11. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [L8, LF].)
8	VERIFY CURRENT INPUT SIGNAL STATUS OF MAF SENSOR • Connect the M-MDS to the DLC-2. • Start the engine. • Perform the PID/DATA Monitor and Record Procedure and access the MAF PID. (See ON-BOARD DIAGNOSTIC TEST [L8, LF].) • Verify that the MAF PID changes quickly according to engine speed. • Is the PID normal? (See PCM INSPECTION [L8, LF].)	Yes	Go to the next step.
8		No	Replace the MAF/IAT sensor, then go to Step 11. (See MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REMOVAL/INSTALLATION [L8, LF].)
9	INSPECT FUEL INJECTOR OPERATION • Perform the Fuel Injector Operation Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L8, LF].) • Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results, then go to Step 11.
9		No	Go to the next step.
10	INSPECT FUEL LINE PRESSURE • Turn the ignition switch off. • Inspect the fuel line pressure. (See FUEL LINE PRESSURE INSPECTION [L8, LF].) • Is the fuel line pressure normal?	Yes	Go to the next step.
10		No	Replace the fuel pump unit, then go to the next step. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [L8, LF].)
11	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 [L8, LF].) • Perform the Drive Mode 01 (Adopted Memory Procedure) and Drive Mode 03 (A/F sensor heater, HO2S heater, A/F sensor, HO2S and TWC Repair Verification). (See OBD DRIVE MODE [L8, LF].) • Is the PENDING CODE for this DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L8, LF].)
11		No	Go to the next step.
12	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [L8, LF].) • Are any DTCs present?	Yes	Go to the applicable DTC troubleshooting. (See DTC TABLE [L8, LF].)
12		No	DTC troubleshooting completed.