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 MANUALSSUBARU2012IMPREZA WRX STI F4-2.5L DOHC TURBOREPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONDIAGNOSTIC TROUBLE CODE DESCRIPTIONSDIAGNOSTIC TROUBLE CODE (DTC) DETECTING CRITERIAP CODESP050A
2012 Subaru Impreza WRX STI F4-2.5L DOHC Turbo
P050A
2012 Subaru Impreza WRX STI F4-2.5L DOHC TurboSECTION P050A
DTC P050A COLD START IDLE AIR CONTROL SYSTEM PERFORMANCE
1. OUTLINE OF DIAGNOSIS
- When cold, the abnormality in the control of target engine speed increase is detected. (P050A)
Judge as NG if the exhaust gas temperature diagnosis or idle speed diagnosis is NG.
- Exhaust gas temperature diagnosis
Judge as NG when the estimated exhausted gas temperature in 14 seconds after the cold start is below the specified value.
- Idle speed diagnosis
Judge as NG when actual engine speed is not close to target engine speed at cold start.
- Detect malfunctions of the catalyst advanced idling retard angle control. (P050B)
Judge as NG when ECM is not controlling the angle properly during catalyst advanced idling retard angle control.
- Final ignition timing diagnosis
Judge as NG when actual retard amount is under the specified value at cold start.
2. ENABLE CONDITIONS
3. GENERAL DRIVING CYCLE
Perform the diagnosis at cold start.
4. DIAGNOSTIC METHOD
- Exhaust gas temperature diagnosis
- Abnormality Judgment
Calculate the estimated exhaust gas temperature when the diagnostic enable condition is established. Judge as NG when the following conditions are established.
Time Needed for Diagnosis: 14 seconds
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
- Normality Judgment
Judge as OK and clear the NG if the following conditions are established.
Time Needed for Diagnosis: Less than 1 second
- Idle speed diagnosis
- Abnormality Judgment
Judge as NG when the following conditions are established after the predetermined time.
Time Needed for Diagnosis: 5000 ms
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
- Normality Judgment
Judge as OK and clear the NG if the following conditions are established.
Time Needed for Diagnosis: 5000 ms
- Final ignition timing diagnosis
- Abnormality Judgment
Judge as NG when the following conditions are established.
Time Needed for Diagnosis: 5000 ms
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
- Normality Judgment
Judge as OK and clear the NG if the following conditions are established.
Time Needed for Diagnosis: 5000 ms
1. OUTLINE OF DIAGNOSIS
- When cold, the abnormality in the control of target engine speed increase is detected. (P050A)
Judge as NG if the exhaust gas temperature diagnosis or idle speed diagnosis is NG.
- Exhaust gas temperature diagnosis
Judge as NG when the estimated exhausted gas temperature in 14 seconds after the cold start is below the specified value.
- Idle speed diagnosis
Judge as NG when actual engine speed is not close to target engine speed at cold start.
- Detect malfunctions of the catalyst advanced idling retard angle control. (P050B)
Judge as NG when ECM is not controlling the angle properly during catalyst advanced idling retard angle control.
- Final ignition timing diagnosis
Judge as NG when actual retard amount is under the specified value at cold start.
2. ENABLE CONDITIONS
3. GENERAL DRIVING CYCLE
Perform the diagnosis at cold start.
4. DIAGNOSTIC METHOD
- Exhaust gas temperature diagnosis
- Abnormality Judgment
Calculate the estimated exhaust gas temperature when the diagnostic enable condition is established. Judge as NG when the following conditions are established.
Time Needed for Diagnosis: 14 seconds
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
- Normality Judgment
Judge as OK and clear the NG if the following conditions are established.
Time Needed for Diagnosis: Less than 1 second
- Idle speed diagnosis
- Abnormality Judgment
Judge as NG when the following conditions are established after the predetermined time.
Time Needed for Diagnosis: 5000 ms
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
- Normality Judgment
Judge as OK and clear the NG if the following conditions are established.
Time Needed for Diagnosis: 5000 ms
- Final ignition timing diagnosis
- Abnormality Judgment
Judge as NG when the following conditions are established.
Time Needed for Diagnosis: 5000 ms
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
- Normality Judgment
Judge as OK and clear the NG if the following conditions are established.
Time Needed for Diagnosis: 5000 ms
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.