DTC P2096 [L3 Turbo]

DTC P2096	Target A/F feedback system too lean
DETECTION CONDITION	• The PCM monitors the target A/F fuel trim while under target A/F feedback control. If the fuel trim is more than the specification, the PCM determines that the target A/F feedback system is too lean. MONITORING CONDITIONS ― HO2S sensor voltage is more than 0.1 V Diagnostic support note • This is a continuous monitor (Fuel system). • 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. • DTCs are stored in the PCM memory.
POSSIBLE CAUSE	• HO2S malfunction • Exhaust gas leakage • Erratic signal to PCM ― ECT sensor signal ― MAF sensor signal ― TP sensor signal ― VSS signal ― Related connector and terminal malfunction ― Related wiring harness malfunction • A/F sensor malfunction • Air suction in intake-air system • MAF sensor malfunction • Improper operation ignition system • Insufficient engine compression • Fuel pressure sensor malfunction • Relief valve (built-in fuel delivery pipe) malfunction • Spill valve control solenoid valve (built-in high pressure fuel pump) malfunction • High pressure fuel pump malfunction • Insufficient fuel line pressure • Fuel pump malfunction • Leakage fuel • Fuel injector malfunction • PCM malfunction

DTC P2096

Target A/F feedback system too lean

DETECTION CONDITION

• The PCM monitors the target A/F fuel trim while under target A/F feedback control. If the fuel trim is more than the specification, the PCM determines that the target A/F feedback system is too lean.

MONITORING CONDITIONS

― HO2S sensor voltage is more than 0.1 V

Diagnostic support note

• This is a continuous monitor (Fuel system).

• 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.

• DTCs are stored in the PCM memory.

POSSIBLE CAUSE

• HO2S malfunction

• Exhaust gas leakage

• Erratic signal to PCM

― ECT sensor signal

― MAF sensor signal

― TP sensor signal

― VSS signal

― Related connector and terminal malfunction

― Related wiring harness malfunction

• A/F sensor malfunction

• Air suction in intake-air system

• MAF sensor malfunction

• Improper operation ignition system

• Insufficient engine compression

• Fuel pressure sensor malfunction

• Relief valve (built-in fuel delivery pipe) malfunction

• Spill valve control solenoid valve (built-in high pressure fuel pump) malfunction

• High pressure fuel pump malfunction

• Insufficient fuel line pressure

• Fuel pump malfunction

• Leakage fuel

• Fuel injector malfunction

• PCM malfunction

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 OR STORED DTC • Turn the ignition switch off then to the ON position (Engine off). • Verify the related PENDING CODE or stored DTCs. • Is the DTC P2177 or P2187 also present?	Yes	Go to the applicable DTC inspection. (SeeDTC TABLE [L3 Turbo].)
No	Go to the next step.
4	IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA • Is DTC P2096 on FREEZE FRAME DATA?	Yes	Go to the next step.
No	Go to FREEZE FRAME DATA DTC inspection. (SeeDTC TABLE [L3 Turbo].)
5	INSPECT HO2S • Inspect HO2S (See AIR FUEL RATIO (A/F) SENSOR, HEATED OXYGEN SENSOR (HO2S) INSPECTION [L3 Turbo].) • Is the HO2S normal?	Yes	Go to the next step.
No	Visually inspect for the exhaust gas leakage between the TWC and HO2S. • If there is no leakage, replace the HO2S. (SeeAIR FUEL RATIO (A/F) SENSOR, HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [L3 Turbo].) Then go to Step 20.
6	VERIFY CURRENT INPUT SIGNAL STATUS • Connect the M-MDS to the DLC-2. • Verify the following PIDs. (SeePCM INSPECTION [L3 Turbo].) ― ECT ― MAF ― TP ― VSS • Are the PIDs normal?	Yes	Go to the next step.
No	Inspect the malfunctioning part according to the inspection results. Then go to Step 20.
7	VERIFY CURRENT INPUT SIGNAL STATUS UNDER FREEZE FRAME DATA CONDITION • Connect the M-MDS to the DLC-2. • Verify the following PIDs under the FREEZE FRAME DATA condition. (SeePCM INSPECTION [L3 Turbo].) ― ECT ― MAF ― TP ― VSS • Are the PIDs normal?	Yes	Go to the next step.
No	Inspect the malfunctioning part according to the inspection results. Then go to Step 20.
8	VERIFY CURRENT INPUT SIGNAL STATUS OF A/F SENSOR • Perform the A/F sensor inspection. (See AIR FUEL RATIO (A/F) SENSOR, HEATED OXYGEN SENSOR (HO2S) INSPECTION [L3 Turbo].) • Is the A/F sensor normal?	Yes	Go to the next step.
No	Visually inspect for the exhaust gas leakage between the exhaust manifold and A/F sensor. • If there is no leakage, replace A/F sensor. (SeeAIR FUEL RATIO (A/F) SENSOR, HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [L3 Turbo].) Then go to Step 20.
9	VERIFY CURRENT INPUT SIGNAL STATUS OF MAF SENSOR • Connect the M-MDS to the DLC-2. • Start the engine. • Access the MAF PID. • Verify that the MAF PID changes quickly according to engine speed. • Is the PID normal?	Yes	Go to Step 11.
No	Go to the next step.
10	INSPECT INTAKE-AIR SYSTEM FOR EXCESSIVE AIR SUCTION • Visually inspect the hose in intake-air system for looseness, cracks or damages. • Is there any malfunction?	Yes	Repair or replace the malfunctioning part, then go to Step 20.
No	Replace the MAF/IAT sensor, then go to Step 20.
11	INSPECT IGNITION COIL WIRING HARNESSES • Inspect the ignition coil related wiring harness condition (intermittent open or short circuit) for all cylinders. • Are wiring harness conditions normal?	Yes	Go to the next step.
No	Repair the wiring harnesses, then go to Step 20.
12	INSPECT IGNITION SYSTEM OPERATION • Perform the spark test. (SeeENGINE CONTROL SYSTEM OPERATION INSPECTION [L3 Turbo].) • Is strong blue spark visible at each cylinder?	Yes	Go to the next step.
No	Repair or replace the malfunctioning part according to spark test result. Then go to Step 20.
13	INSPECT ENGINE COMPRESSION • Inspect the engine compression. (SeeCOMPRESSION INSPECTION [L3 Turbo].) • Is there any malfunction?	Yes	Go to the next step.
No	Overhaul the engine, then go to Step 20.
14	INSPECT FUEL PRESSURE (HIGH-SIDE) • Access and monitor FUEL_PRES PID. • Is the FUEL_PRES PID value within the specified? (SeePCM INSPECTION [L3 Turbo].)	Yes	Go to Step 18.
No	Go to the next step.
15	IDENTIFY CAUSE BY FUEL PRESSURE SENSOR OR HIGH PRESSURE FUEL PUMP • Is the vehicle accelerate performance normally?	Yes	Go to the next step.
No	Go to Step 17.
16	INSPECT FUEL PRESSURE SENSOR • Inspect the fuel pressure sensor. (SeeFUEL PRESSURE SENSOR INSPECTION [L3 Turbo].) • Is the fuel pressure sensor normal?	Yes	Go to Step 18.
No	Replace the fuel delivery pipe, then go to Step 20.
17	INSPECT HIGH PRESSURE FUEL PUMP • Replace the high pressure fuel pump. (See HIGH PRESSURE FUEL PUMP REMOVAL/INSTALLATION [L3 Turbo].) • Monitor FUEL_PRES PID. • Is the FUEL_PRES PID value within the specified? (SeePCM INSPECTION [L3 Turbo].)	Yes	Go to Step 20.
No	Go to the next step.
18	INSPECT FUEL PRESSURE (LOW-SIDE) • Connect the fuel pressure gauge between fuel pump and high pressure fuel pump. • Measure the low side fuel pressure. (SeeFUEL LINE PRESSURE INSPECTION [L3 Turbo].) • Is the low side fuel pressure within the specified?	Yes	Go to the next step.
No	Inspect for following: • Fuel line restriction • Fuel filter clogging If okay replace the fuel pump. Then go to Step 20.
19	INSPECT FUEL INJECTOR • Inspect the fuel injector. (SeeFUEL INJECTOR INSPECTION [L3 Turbo].) • Is there any malfunction?	Yes	Replace the fuel injector, then go to the next step. (SeeFUEL INJECTOR REMOVAL/INSTALLATION [L3 Turbo].)
No	Go to the next step.
20	VERIFY TROUBLESHOOTING OF DTC P2096 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. • Perform the PCM Adaptive Memory Produce Drive Mode. (SeeOBD DRIVE MODE [L3 Turbo].) • Is the PENDING CODE for this DTC present?	Yes	Replace the PCM, then go to the next step. (SeePCM REMOVAL/INSTALLATION [L3 Turbo].)
No	Go to the next step.
21	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (SeeAFTER REPAIR PROCEDURE [L3 Turbo].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (SeeDTC TABLE [L3 Turbo].)
No	Troubleshooting completed.

STEP

INSPECTION

ACTION

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.

Record the FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS on the repair order, then go to the next step.

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.

Go to the next step.

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.

• Is the DTC P2177 or P2187 also present?

Yes

Go to the applicable DTC inspection.

(SeeDTC TABLE [L3 Turbo].)

Go to the next step.

IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA

• Is DTC P2096 on FREEZE FRAME DATA?

Yes

Go to the next step.

Go to FREEZE FRAME DATA DTC inspection.

(SeeDTC TABLE [L3 Turbo].)

INSPECT HO2S

• Inspect HO2S

(See AIR FUEL RATIO (A/F) SENSOR, HEATED OXYGEN SENSOR (HO2S) INSPECTION [L3 Turbo].)

• Is the HO2S normal?

Yes

Go to the next step.

Visually inspect for the exhaust gas leakage between the TWC and HO2S.

• If there is no leakage, replace the HO2S.

(SeeAIR FUEL RATIO (A/F) SENSOR, HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [L3 Turbo].)

Then go to Step 20.

VERIFY CURRENT INPUT SIGNAL STATUS

• Connect the M-MDS to the DLC-2.

• Verify the following PIDs.

(SeePCM INSPECTION [L3 Turbo].)

― ECT

― MAF

― TP

― VSS

• Are the PIDs normal?

Yes

Go to the next step.

Inspect the malfunctioning part according to the inspection results.

Then go to Step 20.

VERIFY CURRENT INPUT SIGNAL STATUS UNDER FREEZE FRAME DATA CONDITION

• Connect the M-MDS to the DLC-2.

• Verify the following PIDs under the FREEZE FRAME DATA condition.

(SeePCM INSPECTION [L3 Turbo].)

― ECT

― MAF

― TP

― VSS

• Are the PIDs normal?

Yes

Go to the next step.

Inspect the malfunctioning part according to the inspection results.

Then go to Step 20.

VERIFY CURRENT INPUT SIGNAL STATUS OF A/F SENSOR

• Perform the A/F sensor inspection.

(See AIR FUEL RATIO (A/F) SENSOR, HEATED OXYGEN SENSOR (HO2S) INSPECTION [L3 Turbo].)

• Is the A/F sensor normal?

Yes

Go to the next step.

Visually inspect for the exhaust gas leakage between the exhaust manifold and A/F sensor.

• If there is no leakage, replace A/F sensor.

(SeeAIR FUEL RATIO (A/F) SENSOR, HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [L3 Turbo].)

Then go to Step 20.

VERIFY CURRENT INPUT SIGNAL STATUS OF MAF SENSOR

• Connect the M-MDS to the DLC-2.

• Start the engine.

• Access the MAF PID.

• Verify that the MAF PID changes quickly according to engine speed.

• Is the PID normal?

Yes

Go to Step 11.

Go to the next step.

INSPECT INTAKE-AIR SYSTEM FOR EXCESSIVE AIR SUCTION

• Visually inspect the hose in intake-air system for looseness, cracks or damages.

• Is there any malfunction?

Yes

Repair or replace the malfunctioning part, then go to Step 20.

Replace the MAF/IAT sensor, then go to Step 20.

INSPECT IGNITION COIL WIRING HARNESSES

• Inspect the ignition coil related wiring harness condition (intermittent open or short circuit) for all cylinders.

• Are wiring harness conditions normal?

Yes

Go to the next step.

Repair the wiring harnesses, then go to Step 20.

INSPECT IGNITION SYSTEM OPERATION

• Perform the spark test.

(SeeENGINE CONTROL SYSTEM OPERATION INSPECTION [L3 Turbo].)

• Is strong blue spark visible at each cylinder?

Yes

Go to the next step.

Repair or replace the malfunctioning part according to spark test result.

Then go to Step 20.

INSPECT ENGINE COMPRESSION

• Inspect the engine compression.

(SeeCOMPRESSION INSPECTION [L3 Turbo].)

• Is there any malfunction?

Yes

Go to the next step.

Overhaul the engine, then go to Step 20.

INSPECT FUEL PRESSURE (HIGH-SIDE)

• Access and monitor FUEL_PRES PID.

• Is the FUEL_PRES PID value within the specified?

(SeePCM INSPECTION [L3 Turbo].)

Yes

Go to Step 18.

Go to the next step.

IDENTIFY CAUSE BY FUEL PRESSURE SENSOR OR HIGH PRESSURE FUEL PUMP

• Is the vehicle accelerate performance normally?

Yes

Go to the next step.

Go to Step 17.

INSPECT FUEL PRESSURE SENSOR

• Inspect the fuel pressure sensor.

(SeeFUEL PRESSURE SENSOR INSPECTION [L3 Turbo].)

• Is the fuel pressure sensor normal?

Yes

Go to Step 18.

Replace the fuel delivery pipe, then go to Step 20.

INSPECT HIGH PRESSURE FUEL PUMP

• Replace the high pressure fuel pump.

(See HIGH PRESSURE FUEL PUMP REMOVAL/INSTALLATION [L3 Turbo].)

• Monitor FUEL_PRES PID.

• Is the FUEL_PRES PID value within the specified?

(SeePCM INSPECTION [L3 Turbo].)

Yes

Go to Step 20.

Go to the next step.

INSPECT FUEL PRESSURE (LOW-SIDE)

• Connect the fuel pressure gauge between fuel pump and high pressure fuel pump.

• Measure the low side fuel pressure.

(SeeFUEL LINE PRESSURE INSPECTION [L3 Turbo].)

• Is the low side fuel pressure within the specified?

Yes

Go to the next step.

Inspect for following:

• Fuel line restriction

• Fuel filter clogging

If okay replace the fuel pump. Then go to Step 20.

INSPECT FUEL INJECTOR

• Inspect the fuel injector.

(SeeFUEL INJECTOR INSPECTION [L3 Turbo].)

• Is there any malfunction?

Yes

Replace the fuel injector, then go to the next step.

(SeeFUEL INJECTOR REMOVAL/INSTALLATION [L3 Turbo].)

Go to the next step.

VERIFY TROUBLESHOOTING OF DTC P2096 COMPLETED

• Make sure to reconnect all disconnected connectors.

• Clear the DTC from the PCM memory using the M-MDS.

• Perform the PCM Adaptive Memory Produce Drive Mode.

(SeeOBD DRIVE MODE [L3 Turbo].)

• Is the PENDING CODE for this DTC present?

Yes

Replace the PCM, then go to the next step.

(SeePCM REMOVAL/INSTALLATION [L3 Turbo].)

Go to the next step.

VERIFY AFTER REPAIR PROCEDURE

• Perform the “AFTER REPAIR PROCEDURE”.

(SeeAFTER REPAIR PROCEDURE [L3 Turbo].)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(SeeDTC TABLE [L3 Turbo].)

Troubleshooting completed.