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Home >> Subaru >> 2005 >> Outback R VDC Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Engine Controls - Engine (Diagnostics) (H4SO)) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P2096 Post Catalyst Fuel Trim System Too Lean Bank 1

DTC P2096 Post Catalyst Fuel Trim System Too Lean Bank 1

WARNING: This page is about a different variant/trim than selected.

DTC DETECTING CONDITION: 

CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode < Ref. to ,  OPERATION  , Clear Memory Mode.> and Inspection Mode < Ref. to ,  PROCEDURE  , Inspection Mode.>. 

WIRING DIAGRAM: 

Fig 1: DTC P2096 Circuit
G03828514Courtesy of SUBARU OF AMERICA, INC.
DTC P2096 DIAGNOSIS

Step Check Yes No
 
1. CHECK FOR ANY OTHER DTC ON DISPLAY. 		 Is any other DTC displayed? Check DTC using "List of Diagnostic Trouble Code (DTC)". < Ref. to , LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >
NOTE: In this case, it is not necessary to inspect DTC P0137.
 Go to step 2. 
2. CHECK REAR OXYGEN SENSOR DATA. 
  1. Warm-up the engine until engine coolant temperature is above 70°C (158CF), and keep the engine speed at 5,000 RPM.
  2. Read the data of rear oxygen sensor signal using Subaru Select Monitor or OBD-II general scan tool.
NOTE:
  • Subaru Select Monitor

    For detailed operation procedure, refer to the "READ CURRENT DATA SHOWN ON DISPLAY FOR ENGINE". < Ref. to , SUBARU SELECT MONITOR . >

  • OBD-II general scan tool

    For detailed operation procedures, refer to the OBD-II general scan tool instruction manual .

 Is the voltage 490 mV? Go to step 5.  Go to step 3. 
3. CHECK HARNESS BETWEEN ECM AND REAR OXYGEN SENSOR CONNECTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connectors from ECM and rear oxygen sensor.
  3. Measure the resistance of harness between ECM and rear oxygen sensor connector.

    Connector & terminal 

    (B137) No. 24 - (B19) No. 3: 

    (B136) No. 35 - (B19) No. 4: 

 Is the resistance more than 3 Ω? Repair open circuit in harness between ECM and rear oxygen sensor connector. Go to step 4. 
4. CHECK HARNESS BETWEEN REAR OXYGEN SENSOR AND ECM CONNECTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from rear oxygen sensor.
  3. Turn the ignition switch to ON.
  4. Measure the voltage between rear oxygen sensor harness connector and engine ground or chassis ground.

    Connector & terminal 

    (B19) No. 3 (+) - Engine ground (-): 

 Is the voltage 0.2 - 0.5 V? Replace the rear oxygen sensor.< Ref. to REAR OXYGEN SENSOR . > Repair harness and connector.
NOTE: In this case, repair the following:
  • Open circuit in harness between rear oxygen sensor and ECM connector
  • Poor contact in rear oxygen sensor connector
  • Poor contact in ECM connector
5. CHECK EXHAUST SYSTEM. 

Check exhaust system parts.

NOTE: Check the following items.
  • Loose installation of portions
  • Damage (crack, hole etc.) of parts
  • Looseness and ill fitting of parts between front oxygen (A/F) sensor and rear oxygen sensor
 Is there any fault in exhaust system? Repair or replace faulty parts. Go to step 6. 
6. CHECK AIR INTAKE SYSTEM.  Are there holes, loose bolts or disconnection of hose on air intake system? Repair air intake system. Go to step 7. 
7. CHECK PURGE CONTROL SOLENOID VALVE OR PRESSURE CONTROL SOLENOID VALVE.  Is the purge control solenoid valve or pressure control solenoid valve stuck? Replace the purge control solenoid valve or pressure control solenoid valve. Go to step 8. 
8. CHECK FUEL PRESSURE. 
WARNING:
  • Place "NO FIRE" signs near the working area.
  • Be careful not to spill fuel on the floor.
  1. Release fuel pressure.
    1. Disconnect the connector from fuel pump relay.
    2. Start the engine and run it until it stalls.
    3. After the engine stalls, cranking it for five more seconds.
    4. Turn the ignition switch to OFF.
  2. Connect the connector to fuel pump relay.
  3. Disconnect the fuel delivery hose from fuel damper valve, and connect fuel pressure gauge.
  4. Install the fuel filler cap.
  5. Start the engine and idle while gear position is neutral.
  6. Measure the fuel pressure while disconnecting pressure regulator vacuum hose from intake manifold.
WARNING: Before removing the fuel pressure gauge, release fuel pressure. 
NOTE: If fuel pressure does not increase, squeeze fuel return hose 2 to 3 times, then measure fuel pressure again.
 Is the fuel pressure 284 - 314 kPa(2.9 -3.2 kg/cm2 , 41 - 46 psi)? Go to step 9.  Repair the following items.

Fuel pressure too high:

  • Clogged fuel return line or bent hose

    Fuel pressure too low:

  • Improper fuel pump discharge
  • Clogged fuel supply line
9. CHECK FUEL PRESSURE. 

After connecting the pressure regulator vacuum hose, measure fuel pressure.

WARNING: Before removing the fuel pressure gauge, release fuel pressure. 
NOTE:
  • If fuel pressure does not increase, squeeze fuel return hose 2 to 3 times, then measure fuel pressure again.
  • If out of specification as measured at this step, check or replace pressure regulator and pressure regulator vacuum hose.
 Is the fuel pressure 206 - 235 kPa (2.1 - 2.4 kg/cm2 , 30 - 34 psi)? Go to step 10.  Repair the following items.

Fuel pressure too high:

  • Faulty pressure regulator
  • Clogged fuel return line or bent hose

Fuel pressure too low:

  • Faulty pressure regulator
  • Improper fuel pump discharge
  • Clogged fuel supply line
10. CHECK ENGINE COOLANT TEMPERATURE SENSOR. 
  1. Start the engine and warm-up completely.
  2. Read the data of engine coolant temperature sensor signal using Subaru Select Monitor or OBD-II general scan tool.
NOTE:
  • Subaru Select Monitor

    For detailed operation procedure, refer to the "READ CURRENT DATA FOR ENGINE". < Ref. to , SUBARU SELECT MONITOR . >

  • OBD-II general scan tool

    For detailed operation procedures, refer to the OBD-II general scan tool instruction manual .

 Is the engine coolant temperature 70- 100°C (158 - 212°F)? Go to step 11.  Replace the engine coolant temperature sensor. < Ref. to ENGINE COOLANT TEMPERATURE SENSOR . >
11. CHECK PRESSURE SENSOR SIGNAL. 
  1. Start the engine and warm-up engine until coolant temperature is greater than 60°C (140°F).
  2. Place the select lever in "N" or "P" range.
  3. Turn the A/C switch to OFF.
  4. Turn all accessory switches to OFF.
  5. Read the data of pressure sensor signal using Subaru Select Monitor or OBD-II general scan tool.
NOTE:
  • Subaru Select Monitor

    For detailed operation procedure, refer to the "READ CURRENT DATA FOR ENGINE". < Ref. to , SUBARU SELECT MONITOR . >

  • OBD-II general scan tool

    For detailed operation procedures, refer to the OBD-II general scan tool instruction manual .

 Idling: Is the measured value 24.0 -41.3 kPa (180 - 310 mmHg, 7.09 - 12.20 inHg), Ignition ON: Is the measured value 73.3 -106.6 kPa (550 - 800 mmHg, 21.65 - 31.50 inHg)? Contact SOA Service Center. Replace the Pressure sensor. < Ref. to MANIFOLD ABSOLUTE PRESSURE SENSOR . >
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