DTC P2096, P2098 [AJ]


DTC P2096 DTC P2098	Target A/F feedback system too lean (Right bank) Target A/F feedback system too lean (Left bank)
DETECTION CONDITION	• The PCM monitors the target A/F fuel trim under the target A/F feedback control. If the fuel trim is more than the specification, the PCM determines that the target A/F feedback system too lean 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 the first drive cycle. • FREEZE FRAME DATA is available. • DTC is stored in the PCM memory.
POSSIBLE CAUSE	• Leakage exhaust gas • HO2S (RR, LR) malfunction • IAT sensor malfunction • ECT sensor malfunction • Air suction in intake-air system • HO2S (RF, LF) malfunction • MAF sensor malfunction • Insufficient fuel line pressure • Fuel pump unit malfunction • Leakage fuel • Improper operation ignition system • Insufficient engine compression • Fuel injector malfunction • PCM malfunction


STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED • Have FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS (Fuel system related) been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS on the repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related Service Information and/or on-line 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.
2		No	Go to the next step.
3	VERIFY RELATED PENDING CODE OR STORED DTC • Turn the ignition switch off, then ON position (Engine off). • Verify the related PENDING CODE or stored DTCs using the WDS or equivalent. • Is the DTC P2177 or P2187 (with P2096), P2179 or P2180 (with P2098) also present?	Yes	Go to appropriate DTC troubleshooting procedure. (See DTC TABLE [AJ] (VIN: JM0 LW10J300 301406-, JMZ LW69J7# 307683-, JM8 LW28J# 301514-, JM8 LW28A*# 301514- (Assumed)).)
3		No	Go to the next step.
4	IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA • Is DTC P2096 or P2098 on FREEZE FRAME DATA?	Yes	Go to the next step.
4		No	Go to troubleshooting for DTC on FREEZE FRAME DATA. (See DTC TABLE [AJ] (VIN: JM0 LW10J300 301406-, JMZ LW69J7# 307683-, JM8 LW28J# 301514-, JM8 LW28A*# 301514- (Assumed)).)
5	VERIFY CURRENT INPUT SIGNAL STATUS OF REAR HO2S • Start the engine and warm it up completely. • Access O2S12 (with P2096) or O2S22 (with P2098) PID using the WDS or equivalent. • Read O2S12 or O2S22 PID under following accelerator pedal condition (in PARK). • Is PID reading normal? - More than 0.45 V when accelerator pedal is suddenly depressed (rich condition). - Less than 0.45 V just after release of accelerator pedal (lean condition).	Yes	Go to the next step.
5		No	Visually inspect for the exhaust gas leakage between TWC and rear HO2S. • If there is no leakage, replace rear HO2S. (See EXHAUST SYSTEM REMOVAL/INSTALLATION [AJ].) Then go to Step 16.
6	VERIFY CURRENT INPUT SIGNAL STATUS (IGNITION SWITCH TO ON/IDLE) • Access ECT, MAF, TP and VSS PIDs using the WDS or equivalent. • Is there any signal that is far out of specification when ignition switch ON and engine runs?	Yes	Inspect suspected sensor and excessive resistance in related wiring harnesses. Repair or if necessary. Then go to Step 16.
6		No	Go to the next step.
7	VERIFY CURRENT INPUT SIGNAL STATUS UNDER TROUBLE CONDITION • Inspect same PIDs as Step 6 while simulating FREEZE FRAME DATA condition. • Is there any signal that causes drastic changes?	Yes	Inspect suspected sensor and excessive resistance in related wiring harnesses. Repair or if necessary. Then go to Step 16.
7		No	Go to the next step.
8	VERIFY CURRENT INPUT SIGNAL STATUS OF FRONT HO2S • Start the engine and warm it up completely. • Access O2S11 (with P2096) or O2S21 (with P2098) PID using the WDS or equivalent. • Read O2S11 or O2S12 PID under following accelerator pedal condition (in PARK). • Is PID reading normal? - More than 0.45 V when accelerator pedal is suddenly depressed (rich condition). - Less than 0.45 V just after release of accelerator pedal (lean condition).	Yes	Go to the next step.
8		No	Visually inspect for the exhaust gas leakage between exhaust manifold and front HO2S. • If there is no leakage, replace front HO2S. (See EXHAUST SYSTEM REMOVAL/INSTALLATION [AJ].) Then go to Step 16.
9	VERIFY CURRENT INPUT SIGNAL STATUS OF MAF SENSOR • Start the engine. • Access the MAF PID using the WDS or equivalent. • Verify that the MAF PID changes quickly according to engine speed. • Is the PID normal?	Yes	Go to the next step.
9		No	Replace the MAF/IAT sensor, then go to Step 16.
10	INSPECT INTAKE-AIR SYSTEM FOR EXCESSIVE AIR SUCTION • Visually inspect for loosen, cracks or damages hose in intake-air system. • Is there any malfunction?	Yes	Repair or replace the malfunctioning part, then go to Step 16.
10		No	Go to the next step.
11	INSPECT FUEL LINE PRESSURE • Perform the "FUEL LINE PRESSURE INSPECTION". (See FUEL LINE PRESSURE INSPECTION [AJ].) • Is there any malfunction?	Yes	Go to the next step.
11		No	Go to Step 13.
12	INSPECT FUEL SYSTEM FOR FUEL LEAKAGE • Visually inspect fuel leakage in the fuel system. • Is there fuel leakage?	Yes	Repair or replace the malfunctioning part, then go to Step 16.
12		No	Replace the fuel pump unit, then go to Step 16. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [AJ].)
13	INSPECT IGNITION SYSTEM • Carry out spark test for right bank cylinders (with P2096) or left bank cylinders (with P2098). (See Spark Test.) • Is strong blue spark visible at each cylinder?	Yes	Go to the next step.
13		No	Repair or replace malfunctioning part according to spark test result. Then go to Step 16.
14	INSPECT ENGINE COMPRESSION • Inspect the engine compression for right bank cylinders (with P2096) or left bank cylinders (with P2098). (See COMPRESSION INSPECTION [AJ].) • Is there any malfunction?	Yes	Go to the next step.
14		No	Overhaul engine, then go to Step 16.
15	INSPECT FUEL INJECTOR • Inspect fuel injector for right bank cylinders (with P2096) or left bank cylinders (with P2098). (See FUEL INJECTOR INSPECTION [AJ] (VIN: JM0 LW10J300 301406-, JMZ LW69J7# 307683-, JM8 LW28J# 301514-, JM8 LW28A*# 301514- (Assumed)).) • Is there any malfunction?	Yes	Replace suspected fuel injector, then go to the next step. (See FUEL INJECTOR REMOVAL/INSTALLATION [AJ].)
15		No	Go to the next step.
16	VERIFY TROUBLESHOOTING OF DTC P2096 AND P2098 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear DTC from PCM memory using WDS or equivalent. • Perform the PCM Adaptive Memory Produce Drive MODE. (See OBD DRIVE MODE [AJ] (VIN: JM0 LW10J300 301406-, JMZ LW69J7# 307683-, JM8 LW28J# 301514-, JM8 LW28A*# 301514- (Assumed)).) • Is the PENDING CODE same DTC present?	Yes	Replace PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [AJ].)
16		No	Go to the next step.
17	VERIFY AFTER REPAIR PROCEDURE • Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE [AJ].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [AJ] (VIN: JM0 LW10J300 301406-, JMZ LW69J7# 307683-, JM8 LW28J# 301514-, JM8 LW28A*# 301514- (Assumed)).)
17		No	Troubleshooting completed.