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.
2005 Mazda MX-5 Miata Base, AutomaticFACTORY OEM SERVICE PROCEDURE
BP With TC
PCM TERMINALS REFERENCE (BP WITH TC)
| Monitor item (Definition) | Unit/Condition | Condition/Specification (Reference) | ACTION | PCM terminal | |||
|---|---|---|---|---|---|---|---|
| ACCS (A/C relay) | ON/OFF | A/C operating: ON Ignition switch ON: OFF |
|
2K | |||
| ACSW (Refrigerant pressure switch) | ON/OFF | Refrigerant pressure switch and fan switch ON: ON Refrigerant pressure switch OFF: OFF |
|
4F | |||
| ALTF (Generator field coil control duty value) | % | Ignition switch ON: 0% Idle: 0-100% Generator operating --> E/L ON: Duty value rise |
|
3M | |||
| ALTT V (Generator output voltage) | V | Ignition switch ON: 1.0 V or less Idle: Approx.14 V |
|
4T | |||
| ARPMDES (Target engine speed) | RPM | Indicate the target engine speed |
|
-- | |||
| BOO (Brake switch) | ON/OFF | Brake pedal depressed: ON Brake pedal released: OFF |
|
4B | |||
| CDCV (EVAP leak detection pump) | ON/OFF | Ignition switch ON: OFF Idle: OFF |
|
4AH | |||
| CHRGLP (Generator warning light) | ON/OFF | Ignition switch ON: ON Idle: OFF |
|
3U | |||
| CPP (Clutch switch) | ON/OFF | Clutch pedal depressed: ON Clutch pedal released: OFF |
|
4I | |||
| CPP/PNP (Neutral switch) | Neutral/Drive | Shift position at neutral: Neutral Others: Drive |
|
4H | |||
| ECT (Engine coolant temperature) | °C | °F | Ignition switch is turned to the ON position: Indicate the engine coolant temperature |
|
4P | ||
| V | ECT 20°C {68°F}: Approx.3.0 V ECT 80°C {176°F}: Approx.0.9 V |
||||||
| EGRCHK (EGR boost sensor solenoid valve) | ON/OFF | Ignition switch ON: OFF Idle: ON |
|
3D | |||
| EVAPCP (Purge solenoid valve duty value) | % | Ignition switch ON: 0% |
|
3C | |||
| FAN2 (Fan control) | ON/OFF | Terminal TEN grounded and throttle valve open: ON Others: OFF |
|
2C | |||
| FAN3 (Fan control) | ON/OFF | Terminal TEN grounded and throttle valve open: ON Others: OFF |
|
2B | |||
| FP (Fuel pump relay) | ON/OFF | Idle: ON Cranking: ON |
|
2M | |||
| FTL V (Fuel tank level signal voltage) | V | Idle condition
NOTE:
|
|
4AD | |||
| FUELPW1 (Fuel injection duration) | ms | Idle: Approx.1.7 ms |
|
2A, 2D, 2GN, 2J | |||
| HTR11 (Heated oxygen sensor heater (Front)) | ON/OFF | Always: ON |
|
3J | |||
| HTR12 (Heated oxygen sensor heater (Rear)) | ON/OFF | ECT above 70°C {158°F}: ON ECT below 70°C {158°F}: OFF |
|
3P | |||
| IAC (Idle air control valve) | % | Idle: Approx.18% |
|
2P, 2Q | |||
| IAT (Intake air temperature) | °C | °F | Indicate the intake air temperature |
|
4N | ||
| V | IAT 20°C {68°F}: 2.3-2.4 V IAT 30°C {86°F}: Approx.1.9 V |
||||||
| IAT2 (Intake air temperature) | °C | °F | Indicate the intake air temperature |
|
4R | ||
| V | IAT 25°C {77°F}: Approx.2.7 V IAT 85°C {185°F}: Approx.0.6 V |
||||||
| IMRC (VTCS solenoid valve) | ON/OFF | ECT below 65°C{149°F} while idling: ON |
|
2N | |||
| IMRCM (VTCS vacuum switch) | ON/OFF | ECT below 65°C {149°F} while idling: ON |
|
4J | |||
| KNOCKR (Knocking retard) | ° | Ignition switch ON: 0° Idle: 0° |
|
4M | |||
| LOAD (Calculated engine load) | % | Idle: Approx.20% |
|
-- | |||
| LONGFT1 (Current long term fuel trim adjustment) | % | Idle: Approx.10% |
|
-- | |||
| MAF (Intake MAF) | g/s lb/min | Idle: 2.6-3.3 g/s {0.3-0.4 lb/min} |
|
4X | |||
| V | Idle: Approx.2.0 V | ||||||
| MAP (Boost pressure) | kPa Bar psi |
Indicate the boost pressure | 4AE | ||||
| V | Ignition switch is turned to the ON position: Approx.2.6 V(1) | ||||||
| MIL (Malfunction indicator lamp) | ON/OFF | Ignition switch ON: ON DTC output: ON No DTC output: OFF |
|
2R | |||
| O2S11 (Heated oxygen sensor (Front)) | V | Ignition switch ON: 0-1.0 V After warm up: 0-1.0 V Acceleration: 0.5-1.0 V Deceleration: 0-0.5 V |
|
4W | |||
| O2S12 (Heated oxygen sensor (Rear)) | V | Ignition switch ON: 0-1.0 V Idle (After warm up): 0-1.0 V Idle (Engine cold): 0-0.5 V Accelerate: 0.5-1.0 V Decelerate: 0-0.5 V |
|
4AA | |||
| PSP (PSP switch) | High/Low | Steering wheel is at straight ahead position: Low Steering wheel is fully turned: High |
|
4C | |||
| RFCFLAG (Fuel learning correction set flag) | ON/OFF | Adaptive memory exists: ON No adaptive memory: OFF |
-- | -- | |||
| RPM (Engine speed) | RPM | Indicate the engine speed |
|
3Y | |||
| SEGRP (EGR valve (stepping motor) position) | step | Ignition switch ON: 0 step Idle: 0 step Cranking: 0-60 steps |
|
2E, 2F, 2H, 2I | |||
| SHRTFT1 (Short term trim) | % | Idle: -25-25% |
|
-- | |||
| SORK TIME (Engine sork time) | MIN | -- | -- | -- | |||
| SPARKADV (Ignition timing) | ° | Indicate the ignition timing |
|
3V | |||
| Test (TEN terminal (DLC)) | ON/OFF | Open terminal TEN: OFF Shorted terminal TEN: ON |
|
4AC | |||
| TP (Throttle position sensor signal voltage) | V | Closed TP: 0.1-1.1 V WOT: 3.0-4.6 V |
|
4V | |||
| VPWR (Battery positive voltage) | V | Ignition switch ON: B+ |
|
4AF, 4AG | |||
| VSS (Vehicle speed) | KPH | MPH | Indicate the vehicle speed |
|
3T | ||
|
|||||||
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.