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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 P0172 System Too Rich (Bank 1)

DTC P0172 System Too Rich (Bank 1)

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

DTC DETECTING CONDITION: 

TROUBLE SYMPTOM: 

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. >
DTC P0172 DIAGNOSIS

Step Check Yes No
1. CHECK EXHAUST SYSTEM.  Are there holes or loose bolts on exhaust system? Repair exhaust system. Go to step 2. 
2. CHECK AIR INTAKE SYSTEM.  Are there holes, loose bolts or disconnection of hose on air intake system? Repair air intake system. Go to step 3. 
3. 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 4. 
4. 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, crank 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 filter, 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 5.  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
5. 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 6.  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
6. 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 7.  Replace the engine coolant temperature sensor. < Ref. to ENGINE COOLANT TEMPERATURE SENSOR . >
7. 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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