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Engine Controls - Trouble Shooting - No Codes: Other Subaru Forester SF рестайлинг

Testing & Diagnostics 5 illustrations ~1151 words

MIL DOES NOT GO OUT

Turn ignition off and disconnect ECM harness connector B134 (35-pin connector), connector B137 (31-pin connector) on Outback 3.0L. Turn ignition on. If MIL light illuminates, repair short in circuit between ECM and instrument panel. If MIL light does not illuminate, replace ECM.

Scheme 47

Scheme 47: MIL DOES NOT BLINK AT A CYCLE OF 3 HZ
Scheme 47: MIL DOES NOT BLINK AT A CYCLE OF 3 HZ

Scheme 48

Scheme 48
Scheme 48

Scheme 49

Scheme 49
Scheme 49
  1. Turn ignition off. Disconnect test mode harness connector under instrument panel. (Scheme 47)or (Scheme 48). Turn ignition on without starting engine. If MIL light illuminates, go to next step. If MIL light does not illuminate, repair MIL circuit. See WIRING DIAGRAMS article.
  2. Turn ignition off. Disconnect ECM harness connector B134 (35-pin connector), connector B137 (31-pin connector) on Outback 3.0L. see scheme 1or see scheme 3. Turn ignition on. If MIL light illuminates, repair short in circuit between ECM and instrument cluster. See WIRING DIAGRAMS article. If MIL light does not illuminate, go to next step.
  3. Turn ignition off. Disconnect ECM harness connector B135 (28-pin connector), connector B134 (22-pin connector) on Outback 3.0L. see scheme 1or see scheme 3. Using a DVOM, measure resistance between test mode harness connector B76 terminal No. 1 and ground. (Scheme 49) If resistance is less than one ohm, go to next step. If resistance is not less than ohm, repair open circuit between test mode harness connector and ground. See WIRING DIAGRAMS article.
  4. Check ECM harness connectors for proper contact and repair as required. If connectors are okay, go to next step.
  5. Ensure all harness connectors are attached at ECM and instrument cluster. Connect test mode harness connector under instrument panel. Using a DVOM connected to ground, backprobe ECM harness connector B135 (28-pin connector), connector B134 (22-pin connector) on Outback 3.0L terminal No. 14. see scheme 1or see scheme 3. If resistance is less than one ohm, repair poor contact in ECM harness connector. If harness connector is okay, replace ECM. If resistance is not less than one ohm, repair open in circuit between ECM and test mode harness connector. See WIRING DIAGRAMS article.

MIL CONTINUES BLINKING AT A CYCLE OF 3 HZ

Turn ignition off and disconnect ECM harness connector B135 (28-pin connector), connector B134 (22-pin connector) on Outback 3.0L. Using a DVOM connected to ground, measure resistance at terminal No. 14. (Scheme 50)or (Scheme 51). If resistance is less than 5 ohms, repair short in circuit between ECM and test mode harness connector. If resistance is not less than 5 ohms, replace ECM and retest system. See WIRING DIAGRAMS article.

Scheme 50

Scheme 50: MIL CONTINUES BLINKING AT A CYCLE OF 3 HZ
Scheme 50: MIL CONTINUES BLINKING AT A CYCLE OF 3 HZ

Scheme 51

Scheme 51
Scheme 51

ENGINE STALLS DURING IDLE

  1. Check Idle Air Control (IAC) solenoid valve.
  2. Check Intake Manifold Pressure (IMP) sensor (Except Forester).
  3. Check Intake Air Temperature (IAT) sensor (Except Forester).
  4. Check intake air temperature and pressure sensor.
  5. Check ignition parts; ignitor, ignition coil and spark plugs.
  6. Check Engine Coolant Temperature (ECT) sensor, if symptom occurs only in cold temperatures.
  7. Check Crankshaft Position (CKP) sensor, ensure component is securely installed.
  8. Check Camshaft Position (CMP) sensor, ensure component is securely installed.
  9. Check fuel injection components; fuel injectors, fuel pressure regulator and fuel filter.
  10. Check EGR valve (Outback 3.0L).

ROUGH IDLE

  1. Check Idle Air Control (IAC) solenoid valve.
  2. Check Intake Manifold Pressure (IMP) sensor (Except Forester).
  3. Check Intake Air Temperature (IAT) sensor (Except Forester).
  4. Check intake air temperature and pressure sensor.
  5. Check Engine Coolant Temperature (ECT) sensor, if symptom occurs only in cold temperatures.
  6. Check ignition parts; ignitor, ignition coil and spark plugs.
  7. Check air intake system for air leak(s).
  8. Check fuel injection components; fuel injectors, fuel pressure regulator and fuel filter.
  9. Check Throttle Position (TP) sensor.
  10. Check Crankshaft Position (CKP) sensor, ensure component is securely installed.
  11. Check Camshaft Position (CMP) sensor, ensure component is securely installed.
  12. Check Heated Oxygen Sensor (HO2S).
  13. Check fuel pump and fuel pump relay.
  14. Check EGR valve (Outback 3.0L).

ENGINE DOES NOT RETURN TO IDLE

  1. Check Idle Air Control Solenoid (IACS) valve.
  2. Check Engine Coolant Temperature (ECT) sensor.
  3. Check accelerator cable, adjust if necessary.
  4. Check Throttle Position (TP) sensor.
  5. Check Intake Manifold Pressure (IMP) sensor (Except Forester).
  6. Check Intake Air Temperature (IAT) sensor (Except Forester).
  7. Check intake air temperature and pressure sensor.
  8. Check EGR valve (Outback 3.0L).

POOR ACCELERATION

  1. Check Intake Manifold Pressure (IMP) sensor. (Except Forester)
  2. Check Intake Air Temperature (IAT) sensor. (Except Forester)
  3. Check intake air temperature and pressure sensor.
  4. Check Throttle Position (TP) sensor.
  5. Check fuel injection components; fuel injectors, fuel pressure regulator and fuel filter.
  6. Check fuel pump and fuel pump relay.
  7. Check Engine Coolant Temperature (ECT) sensor, if symptom occurs only in cold temperatures.
  8. Check Crankshaft Position (CKP) sensor, ensure component is securely installed.
  9. Check Camshaft Position (CMP) sensor, ensure component is securely installed.
  10. Check A/C switch and A/C cut relay.
  11. Check engine torque control signal circuit.
  12. Check ignition parts; ignitor, ignition coil and spark plugs.
  13. Check EGR valve (Outback 3.0L).

ENGINE STALLS, SAGS OR HESITATES DURING ACCELERATION

  1. Check Intake Manifold Pressure (IMP) sensor (Except Forester).
  2. Check Intake Air Temperature (IAT) sensor (Except Forester).
  3. Check intake air temperature and pressure sensor.
  4. Check Engine Coolant Temperature (ECT) sensor, if symptom occurs only in cold temperatures.
  5. Check Crankshaft Position (CKP) sensor, ensure component is securely installed.
  6. Check Camshaft Position (CMP) sensor, ensure component is securely installed.
  7. Check purge control solenoid valve.
  8. Check fuel injection components; fuel injectors, fuel pressure regulator and fuel filter.
  9. Check Throttle Position (TP) sensor.
  10. Check fuel pump and fuel pump relay.
  11. Check EGR valve (Outback 3.0L).

SURGE

  1. Check Intake Manifold Pressure (IMP) sensor (Except Forester).
  2. Check Intake Air Temperature (IAT) sensor (Except Forester).
  3. Check intake air temperature and pressure sensor.
  4. Check Engine Coolant Temperature (ECT) sensor, if symptom occurs only in cold temperatures.
  5. Check Crankshaft Position (CKP) sensor, ensure component is securely installed.
  6. Check Camshaft Position (CMP) sensor, ensure component is securely installed.
  7. Check fuel injection components; fuel injectors, fuel pressure regulator and fuel filter.
  8. Check Throttle Position (TP) sensor.
  9. Check fuel pump and fuel pump relay.
  10. Check EGR valve (Outback 3.0L).

SPARK KNOCK

  1. Check Intake Manifold Pressure (IMP) sensor (Except Forester).
  2. Check Intake Air Temperature (IAT) sensor (Except Forester).
  3. Check intake air temperature and pressure sensor.
  4. Check Engine Coolant Temperature (ECT) sensor.
  5. Check Knock Sensor (KS).
  6. Check fuel injection components; fuel injectors, fuel pressure regulator and fuel filter.
  7. Check fuel pump and fuel pump relay.

AFTER-BURN IN EXHAUST SYSTEM

  1. Check Intake Manifold Pressure (IMP) sensor (Except Forester).
  2. Check Intake Air Temperature (IAT) sensor (Except Forester).
  3. Check intake air temperature and pressure sensor.
  4. Check Engine Coolant Temperature (ECT) sensor, if symptom occurs only in cold temperatures.
  5. Check fuel injection components; fuel injectors, fuel pressure regulator and fuel filter.
  6. Check fuel pump and fuel pump relay.

Intermittent Simulation

To reproduce the conditions creating an intermittent fault, use the following methods

  1. Lightly vibrate component.
  2. Heat component.
  3. Wiggle or bend wiring harness.
  4. Spray component with water.
  5. Remove/apply vacuum source.

Monitor circuit/component voltage or resistance while simulating intermittent. If engine is running, monitor for self-diagnostic codes. Use test results to identify a faulty component or circuit.

More articles — Engine Controls - Trouble Shooting - No Codes