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.
2016 Subaru BRZ Limited, Automatic TransFACTORY OEM SERVICE PROCEDURE
Symptom Table
| Symptom | Suspected Area | See Test | ||||
|---|---|---|---|---|---|---|
| Engine does not crank (Does not start) | Battery | ON-VEHICLE INSPECTION | ||||
| Starter | ON-VEHICLE INSPECTION | |||||
| Park/neutral position switch assembly(1) | ADJUSTMENT | |||||
| Clutch start switch assembly(2) | ON-VEHICLE INSPECTION | |||||
| Starter signal circuit | STARTER SYSTEM (MODELS WITH SMART ENTRY & START SYSTEM) , STARTER SYSTEM (MODELS WITHOUT SMART ENTRY & START SYSTEM) | |||||
| No initial combustion (Does not start) | ECM power source circuit | ECM POWER SUPPLY SYSTEM | ||||
| Crankshaft position sensor | INSTALLATION | |||||
| Ignition system | CIRCUIT FIGURE | |||||
| Fuel pump control circuit | FUEL PUMP CONTROL SYSTEM | |||||
| Fuel pump | UNIT INSPECTION | |||||
| Fuel injector circuit | FUEL INJECTOR CIRCUIT | |||||
| Valve timing | TIMING CHAIN (FA20) | |||||
| VC output circuit (ECM 5 V output) | VC POWER SUPPLY CIRCUIT | |||||
| VVT sensor (for intake side) | DTC P0351 IGNITION COIL "A" PRIMARY/SECONDARY CIRCUIT; DTC P0352 IGNITION COIL "B" PRIMARY/SECONDARY CIRCUIT; DTC P0353 IGNITION COIL "C" PRIMARY/SECONDARY CIRCUIT; DTC P0354 IGNITION COIL "D" PRIMARY/SECONDARY CIRCUIT | |||||
| VVT sensor (for exhaust side) | DTC P0420 CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD (BANK 1) | |||||
| Starter signal circuit | STARTER SYSTEM (MODELS WITH SMART ENTRY & START SYSTEM) , STARTER SYSTEM (MODELS WITHOUT SMART ENTRY & START SYSTEM) | |||||
| Engine Immobilizer system | DESCRIPTION OF FUNCTIONS | |||||
| ECM | REMOVAL | |||||
| Engine cranks normally but difficult to start | Fuel pump control circuit | FUEL PUMP CONTROL SYSTEM | ||||
| Fuel pump (for high pressure) | UNIT INSPECTION | |||||
| Fuel injector circuit | FUEL INJECTOR CIRCUIT | |||||
| Fuel injector assembly (for port injection) | INSTALLATION | |||||
| Fuel injector assembly (for direct injection) | UNIT INSPECTION | |||||
| ECM power source circuit | ECM POWER SUPPLY SYSTEM | |||||
| Starter signal circuit | STARTER SYSTEM (MODELS WITH SMART ENTRY & START SYSTEM) , STARTER SYSTEM (MODELS WITHOUT SMART ENTRY & START SYSTEM) | |||||
| Engine coolant temperature sensor | INSTALLATION | |||||
| Intake system | ON-VEHICLE INSPECTION | |||||
| Ignition system | CIRCUIT FIGURE | |||||
| Spark plug | CAMSHAFT TIMING OIL CONTROL VALVE assembly (FA20) | |||||
| Throttle with motor body assembly | INSTALLATION | |||||
| Compression | ENGINE (FA20) | |||||
| Incomplete intermittent combustion occurs (Does not start) | Fuel pump control circuit | FUEL PUMP CONTROL SYSTEM | ||||
| Fuel line | FUNCTION INSPECTION | |||||
| Ignition circuit | DTC P0365 CAMSHAFT POSITION SENSOR "B" CIRCUIT (BANK 1); DTC P0366 CAMSHAFT POSITION SENSOR "B" CIRCUIT RANGE/PERFORMANCE (BANK 1); DTC P0390 CAMSHAFT POSITION SENSOR "B" CIRCUIT (BANK 2); DTC P0391 CAMSHAFT POSITION SENSOR "B" CIRCUIT RANGE/PERFORMANCE (BANK 2) | |||||
| Ignition system | CIRCUIT FIGURE | |||||
| Fuel injector circuit | FUEL INJECTOR CIRCUIT | |||||
| Fuel injector assembly (for port injection) | INSTALLATION | |||||
| Fuel injector assembly (for direct injection) | UNIT INSPECTION | |||||
| ECM power source circuit | ECM POWER SUPPLY SYSTEM | |||||
| Starter signal circuit | STARTER SYSTEM (MODELS WITH SMART ENTRY & START SYSTEM) , STARTER SYSTEM (MODELS WITHOUT SMART ENTRY & START SYSTEM) | |||||
| Crankshaft position sensor | INSTALLATION | |||||
| VVT sensor (for intake side) | DTC P0351 IGNITION COIL "A" PRIMARY/SECONDARY CIRCUIT; DTC P0352 IGNITION COIL "B" PRIMARY/SECONDARY CIRCUIT; DTC P0353 IGNITION COIL "C" PRIMARY/SECONDARY CIRCUIT; DTC P0354 IGNITION COIL "D" PRIMARY/SECONDARY CIRCUIT | |||||
| VVT sensor (for exhaust side) | DTC P0420 CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD (BANK 1) | |||||
| Valve timing | TIMING CHAIN (FA20) | |||||
| High engine idle speed | Throttle with motor body assembly | INSTALLATION | ||||
| Intake system | ON-VEHICLE INSPECTION | |||||
| A/C signal circuit | CURRENT DATA DISPLAY & SAVE/SYSTEM OPERATION CHECK MODE | |||||
| ECM power source circuit | ECM POWER SUPPLY SYSTEM | |||||
| Engine coolant temperature sensor | INSTALLATION | |||||
| PCV valve and hose | ON-VEHICLE INSPECTION | |||||
| Low engine idle speed (Poor idling) | Throttle with motor body assembly | INSTALLATION | ||||
| A/C signal circuit | CURRENT DATA DISPLAY & SAVE/SYSTEM OPERATION CHECK MODE | |||||
| Fuel pump control circuit | FUEL PUMP CONTROL SYSTEM | |||||
| Fuel pump | UNIT INSPECTION | |||||
| Intake system | ON-VEHICLE INSPECTION | |||||
| PCV valve and hose | ON-VEHICLE INSPECTION | |||||
| Rough idling | Compression | ENGINE (FA20) | ||||
| Ignition system | CIRCUIT FIGURE | |||||
| Spark plug | CAMSHAFT TIMING OIL CONTROL VALVE assembly (FA20) | |||||
| Fuel injector circuit | FUEL INJECTOR CIRCUIT | |||||
| ECM power source circuit | ECM POWER SUPPLY SYSTEM | |||||
| Fuel pump control circuit | FUEL PUMP CONTROL SYSTEM | |||||
| Fuel injector assembly (for port injection) | INSTALLATION | |||||
| Fuel injector assembly (for direct injection) | UNIT INSPECTION | |||||
| Fuel pump (for high pressure) | UNIT INSPECTION | |||||
| Fuel line | FUNCTION INSPECTION | |||||
| Throttle with motor body assembly | INSTALLATION | |||||
| Intake system | ON-VEHICLE INSPECTION | |||||
| Purge valve | INSTALLATION | |||||
| PCV valve and hose | ON-VEHICLE INSPECTION | |||||
| Air fuel ratio sensor | INSTALLATION | |||||
| Heated oxygen sensor | INSTALLATION | |||||
| Mass air flow meter | ON-VEHICLE INSPECTION | |||||
| Knock sensor | UNIT INSPECTION | |||||
| Hunting (Poor idling) | Throttle with motor body assembly | INSTALLATION | ||||
| Intake system | ON-VEHICLE INSPECTION | |||||
| PCV valve and hose | ON-VEHICLE INSPECTION | |||||
| Air fuel ratio sensor | INSTALLATION | |||||
| Mass air flow meter | ON-VEHICLE INSPECTION | |||||
| Hesitation/poor acceleration | Fuel pump control circuit | FUEL PUMP CONTROL SYSTEM | ||||
| Fuel pump (for high pressure) | UNIT INSPECTION | |||||
| Fuel line | FUNCTION INSPECTION | |||||
| Spark plug | CAMSHAFT TIMING OIL CONTROL VALVE assembly (FA20) | |||||
| Ignition system | CIRCUIT FIGURE | |||||
| Fuel injector circuit | FUEL INJECTOR CIRCUIT | |||||
| Fuel injector assembly (for port injection) | INSTALLATION | |||||
| Fuel injector assembly (for direct injection) | UNIT INSPECTION | |||||
| ECM power source circuit | ECM POWER SUPPLY SYSTEM | |||||
| Knock sensor | UNIT INSPECTION | |||||
| Mass air flow meter | ON-VEHICLE INSPECTION | |||||
| Throttle with motor body assembly | INSTALLATION | |||||
| Intake system | ON-VEHICLE INSPECTION | |||||
| Valve timing | TIMING CHAIN (FA20) | |||||
| Compression | ENGINE (FA20) | |||||
| Brake override system | BRAKE OVERRIDE SYSTEM | |||||
| Surging (Poor driveability) | Spark plug | CAMSHAFT TIMING OIL CONTROL VALVE assembly (FA20) | ||||
| Fuel pump control circuit | FUEL PUMP CONTROL SYSTEM | |||||
| Fuel pump (for high pressure) | UNIT INSPECTION | |||||
| Ignition system | CIRCUIT FIGURE | |||||
| Fuel injector circuit | FUEL INJECTOR CIRCUIT | |||||
| Fuel injector assembly (for port injection) | INSTALLATION | |||||
| Fuel injector assembly (for direct injection) | UNIT INSPECTION | |||||
| ECM power source circuit | ECM POWER SUPPLY SYSTEM | |||||
| Mass air flow meter | ON-VEHICLE INSPECTION | |||||
| Variable Valve Timing (VVT) system | UNIT INSPECTION | |||||
| Compression | ENGINE (FA20) | |||||
| Engine stalls soon after starting | Fuel pump control circuit | FUEL PUMP CONTROL SYSTEM | ||||
| Fuel pump (for high pressure) | UNIT INSPECTION | |||||
| Spark plug | CAMSHAFT TIMING OIL CONTROL VALVE assembly (FA20) | |||||
| Ignition system | CIRCUIT FIGURE | |||||
| Fuel injector circuit | FUEL INJECTOR CIRCUIT | |||||
| Fuel injector assembly (for port injection) | INSTALLATION | |||||
| Fuel injector assembly (for direct injection) | UNIT INSPECTION | |||||
| ECM power source circuit | ECM POWER SUPPLY SYSTEM | |||||
| Mass air flow meter | ON-VEHICLE INSPECTION | |||||
| Variable Valve Timing (VVT) system | UNIT INSPECTION | |||||
| Throttle with motor body assembly | INSTALLATION | |||||
| Intake system | ON-VEHICLE INSPECTION | |||||
| Engine Immobilizer system | DESCRIPTION OF FUNCTIONS | |||||
| PCV valve and hose | ON-VEHICLE INSPECTION | |||||
| Compression | ENGINE (FA20) | |||||
| Engine stalls only during A/C operation | A/C signal circuit | CURRENT DATA DISPLAY & SAVE/SYSTEM OPERATION CHECK MODE | ||||
| ECM | REMOVAL | |||||
| Unable/difficult to refuel | Fuel system (canister, refueling valve, roll over valve, fuel tank, etc.) | - | ||||
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Factory Service Tools
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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.
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