Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSSUBARU2007LEGACY I, 4D WAGON, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMDIAGNOSTIC TROUBLE CODE (DTC) DETECTING CRITERIA (H4SO)DIAGNOSTIC TROUBLE CODE (DTC) DETECTING CRITERIADTC P1602 CONTROL MODULE PROGRAMMING ERRORENABLE CONDITION
2007 Subaru Legacy i, 4D Wagon, Automatic
Enable Condition
2007 Subaru Legacy i, 4D Wagon, AutomaticSECTION Enable Condition
ENABLE CONDITION
| Secondary Parameters | Enable Conditions |
|---|---|
| Barometric pressure | > 75.1 kPa (563 mmHg, 22.2 inHg) |
| Battery voltage | > 10.9 V |
| Cold start diagnosis | Incomplete |
| Engine | Starting |
| Vehicle speed | ≤ 2 km/h (1 MPH) |
| Misfire within 200 engine revs. | < 5 |
| Time after starting | = 14 seconds |
- Intake air amount diagnosis
ENABLE CONDITION
| Secondary Parameters | Enable Conditions |
|---|---|
| Barometric pressure | > 75.1 kPa (563 mmHg, 22.2 inHg) |
| Battery voltage | > 10.9 V |
| Cold start diagnosis | Incomplete |
| Engine | Starting |
| Vehicle speed | ≤ 3 km/h (2 MPH) |
| After ISC control | ≥ 1.5 seconds |
| Lower limit number of revolutions counter | < 2000 |
| Nuetral switch ON/OFF operation | > 3 seconds |
| Catalyst advanced idling retard angle control 1 | Controlled |
| Catalyst warm up | Under catalyst warm up |
| After load (A/C, power steering, lighting, rear defogger, heater fan and radiator fan) operations | ≥ 3.5 seconds |
| Misfire within 200 engine revs. | < 5 |
| Cold start (with the following conditions established) | |
| |Engine coolant temperature - intake air temperature| | ≤ 5°C(41°F) |
| |Engine coolant temperature - Fuel temperature| | ≤ 2°C (36°F) |
| Warm up mode shift time | ≥ 6 seconds |
- Idle speed diagnosis
ENABLE CONDITION
| Secondary Parameters | Enable Conditions |
|---|---|
| Barometric pressure | > 75.1 kPa (563 mmHg, 22.2 inHg) |
| Battery voltage | > 10.9 V |
| Cold start diagnosis | Incomplete |
| Engine | Starting |
| Vehicle speed | ≤ 3 km/h (2 MPH) |
| After ISC control | ≥ 1.5 seconds |
| Lower limit number of revolutions counter | < 2000 |
| Nuetral switch ON/OFF operation | > 3 seconds |
| Catalyst advanced idling retard angle control 1 | Controlled |
| Catalyst warm up | Under catalyst warm up |
| After load (A/C, power steering, lighting, rear defogger, heater fan and radiator fan) operations | ≥ 3.5 seconds |
| Misfire within 200 engine revs. | < 5 |
| Intake air amount diagnosis | Undetermined |
| Cold start (with the following conditions established) | |
| |Engine coolant temperature - intake air temperature| | ≤ 5°C(41°F) |
| |Engine coolant temperature - Fuel temperature| | ≤ 2°C (36°F) |
| Warm up mode shift time | ≥ 6 seconds |
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.