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 MANUALSMAZDA2013MX-5 MIATA GRAND TOURING, AUTOMATIC TRANSREPAIR AND DIAGNOSISENGINE PERFORMANCEENGINE CONTROL SYSTEMSPCM INSPECTIONNOT USING THE M-MDS
2013 Mazda MX-5 Miata Grand Touring, Automatic Trans
Not Using the M-MDS
2013 Mazda MX-5 Miata Grand Touring, Automatic TransSECTION Not Using the M-MDS
NOTE:
- The PCM terminal voltage can vary with the conditions when measuring and changes due to aged deterioration on the vehicle, causing false diagnosis. Therefore determine comprehensively where the malfunction occurs among the input systems, output systems, and the PCM.
| Terminal | Signal | Connected to | Test condition | Voltage (V) | Inspection item | |||||||
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| 1A | - | - | - | - | - | |||||||
| 1B | Starter relay control | Starter relay | Under any condition | Below 1.0 |
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| 1C | - | - | - | - | - | |||||||
| 1D(2) | Clutch operation | CPP switch | Clutch pedal depressed | Below 1.0 |
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| Clutch pedal released | B+ | |||||||||||
| 1E | - | - | - | - | - | |||||||
| 1F | - | - | - | - | - | |||||||
| 1G | - | - | - | - | - | |||||||
| 1H | Fuel pump control | Fuel pump relay | Ignition switch is turned to the ON position (Engine off) and a certain period has elapsed | B+ |
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| Cranking | Below 1.0 | |||||||||||
| Idle | Below 1.0 | |||||||||||
| 1I | A/C | A/C relay | Engine running | A/C operating | Below 1.0 |
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| A/C not operating | B+ | |||||||||||
| 1J | Refrigerant pressure switch (middle) | Refrigerant pressure switch (middle) | Refrigerant pressure is more than the specification. (Refrigerant pressure switch (middle) is on). | Below 1.0 |
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| Refrigerant pressure is less than the specification. (Refrigerant pressure switch (middle) is off). | B+ | |||||||||||
| 1K | - | - | - | - | - | |||||||
| 1L | - | - | - | - | - | |||||||
| 1M | Cooling fan control | Cooling fan relay No. 1 | Cooling fan not operating | B+ |
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| Cooling fan operating | Below 1.0 | |||||||||||
| 1N | Cooling fan control | Cooling fan relay No. 2 | Cooling fan not operating | B+ |
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| Cooling fan operating | Below 1.0 | |||||||||||
| 1O | - | - | - | - | - | |||||||
| 1P | MAF sensor ground | MAF sensor | Under any condition | Below 1.0 |
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| 1Q | Main relay control | Main relay | Ignition switch is turned to the ON position | Below 1.0 |
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| Ignition switch off and a certain period has elapsed | B+ | |||||||||||
| 1R | Cooling fan control | Cooling fan relay No. 3 | Cooling fan not operating | B+ |
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| Cooling fan operating | Below 1.0 | |||||||||||
| 1S | - | - | - | - | - | |||||||
| 1T | - | - | - | - | - | |||||||
| 1U | EVAP system leak detection pump (pump) | EVAP system leak detection pump | Ignition switch is turned to the ON position | B+ |
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| Idle | B+ | |||||||||||
| 1V | EVAP system leak detection pump (solenoid) | EVAP system leak detection pump | Ignition switch is turned to the ON position | B+ |
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| Idle | B+ | |||||||||||
| 1W | - | - | - | - | - | |||||||
| 1X | Neutral position(2) | Neutral switch | Shift lever is at neutral position | Below 1.0 |
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| Shift lever is not at neutral position | B+ | |||||||||||
| Selector lever position(1) | TR switch | Ignition switch is turned to the ON position | P, N position | Below 1.0 |
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| Except above | B+ | |||||||||||
| 1Y | - | - | - | - | - | |||||||
| 1Z | - | - | - | - | - | |||||||
| 1AA | - | - | - | - | - | |||||||
| 1AB | Brake switch No. 1 | Brake switch No. 1 | Brake pedal depressed | B+ |
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| Brake pedal released | Below 1.0 | |||||||||||
| 1AC | - | - | - | - | - | |||||||
| 1AD | - | - | - | - | - | |||||||
| 1AE | - | - | - | - | - | |||||||
| 1AF | Brake switch No. 2 | Brake switch No. 2 | Brake pedal depressed | B+ |
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| Brake pedal released | Below 1.0 | |||||||||||
| 1AG | - | - | - | - | - | |||||||
| 1AH | - | - | - | - | - | |||||||
| 1AI | CAN_L | CAN related module | Because this terminal is for CAN, no valid determination of terminal voltage is possible |
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| 1AJ | APP sensor No. 2 power supply | APP sensor | Ignition switch is turned to the ON position | Approx. 5.0 |
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| 1AK | MAF | MAF sensor | Ignition switch is turned to the ON position | Approx. 0.7 |
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| Idle | Approx. 1.4 | |||||||||||
| 1AL | APP sensor No. 1 power supply | APP sensor | Ignition switch is turned to the ON position. | Approx. 5.0 |
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| 1AM | CAN_H | CAN related module | Because this terminal is for CAN, no valid determination of terminal voltage is possible |
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| 1AN | - | - | - | - | - | |||||||
| 1AO | APP sensor No. 1 | APP sensor | Ignition switch is turned to the ON position | Accelerator pedal depressed | Approx. 3.9 |
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| Accelerator pedal released | Approx. 1.6 | |||||||||||
| 1AP | APP sensor No. 2 | APP sensor | Ignition switch is turned to the ON position | Accelerator pedal depressed | Approx. 3.4 |
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| Accelerator pedal released | Approx. 1.0 | |||||||||||
| 1AQ(3) | Cruise control switch | Cruise control switch | Ignition switch is turned to the ON position | ON OFF switch pressed in | Approx. 0 |
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| CANCEL switch pressed in | Approx. 1.1 | |||||||||||
| SET/- switch pressed in | Approx. 3.1 | |||||||||||
| RES/+ switch pressed in | Approx. 4.2 | |||||||||||
| Except above | Approx. 5.0 | |||||||||||
| 1AR | Sensor ground | MAF/IAT sensor | Under any condition | Below 1.0 |
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| 1AS | APP sensor No. 1 ground | APP sensor | Under any condition | Below 1.0 |
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| 1AT | IAT | MAF/IAT sensor | Ignition switch is turned to the ON position | IAT is 20°C {68°F} | Approx. 2.4 |
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| IAT is 60°C {140°F} | Approx. 0.9 | |||||||||||
| 1AU | Refrigerant pressure switch (high, low) | Refrigerant pressure switch (high, low) | Ignition switch is turned to the ON position | A/C operating | Below 1.0 |
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| A/C not operating | B+ | |||||||||||
| 1AV | APP sensor No. 2 ground | APP sensor | Under any condition | Below 1.0 |
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| 1AW | B+ | Main relay | Ignition switch off | Below 1.0 |
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| Ignition switch is turned to the ON position | B+ | |||||||||||
| 1AX | Drive-by-wire relay control | Drive-by-wire relay | Under any condition | Below 1.0 |
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| 1AY | Ignition switch on | Ignition switch | Ignition switch off | Below 1.0 |
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| Ignition switch is turned to the ON position | B+ | |||||||||||
| 1AZ | Ground | Ground | Under any condition | Below 1.0 |
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| 1BA | Back-up power supply | Battery (positive terminal) | Under any condition | B+ |
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| IBB | Ground | Ground | Under any condition | Below 1.0 |
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| 1BC | - | - | - | - | - | |||||||
| 1BD | Ground | Ground | Under any condition | Below 1.0 |
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| 1BE | B+ | Main relay | Ignition switch off | Below 1.0 |
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| Ignition switch is turned to the ON position | B+ | |||||||||||
| 1BF | Drive-by-wire relay control | Drive-by-wire relay | Ignition switch is turned to the ON position | Drive-by-wire system is malfunction | Below 1.0 |
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| Drive-by-wire system is normal | B+ | |||||||||||
| 1BG | - | - | - | - | - | |||||||
| 1BH | Ground | Ground | Under any condition | Below 1.0 |
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| 2A | Throttle control (+) | Throttle body (Throttle valve actuator) |
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| 2B | Throttle control (-) | Throttle body (Throttle valve actuator) |
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| 2C | Purge control | Purge solenoid valve |
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| 2D | - | - | - | - | - | |||||||
| 2E | OCV control | OCV |
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| 2F | - | - | - | - | - | |||||||
| 2G | EGR valve #2 coil control | EGR valve (terminal A) | Idle (EGR control not operating) | B+ |
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| 2H | EGR valve #4 coil control | EGR valve (terminal F) | Idle (EGR control not operating) | B+ |
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| 2I(1) | Variable tumble control | Variable tumble solenoid valve | ECT 63°C {145°F} or more or engine speed 3, 750 rpm or more | B+ |
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| ECT less than 63°C {145°F} and engine speed less than 3, 750 rpm | Below 1.0 | |||||||||||
| 2J | Variable intake air control | Variable intake air solenoid valve | Ignition switch is turned to the ON position | Below 1.0 |
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| Engine speed: less than 4, 750 rpm | Below 1.0 | |||||||||||
| Engine speed: 4, 750 rpm or more | B+ | |||||||||||
| 2K | EGR valve #1 coil control | EGR valve (terminal E) | Idle (EGR control not operating) | Below 1.0 |
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| 2L | EGR valve #3 coil control | EGR valve (terminal B) | Idle (EGR control not operating) | B+ |
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| 2M | - | - | - | - | - | |||||||
| 2N | - | - | - | - | - | |||||||
| 20 | - | - | - | - | - | |||||||
| 2P | CMP sensor ground | CMP sensor | Under any condition | Below 1.0 |
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| 2Q | HO2S | HO2S | Idle after warm-up | Alternates between 0 and 1.0 |
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| 2R | - | - | - | - | - | |||||||
| 2S | CMP | CMP sensor |
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| 2T | Power steering pressure | PSP switch | Idle | Steering wheel at straight ahead position | B+ |
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| While turning steering wheel | Below 1.0 | |||||||||||
| 2U | Knocking (+) | KS | Ignition switch ON (Use digital type voltmeter, because measurement voltage will be detected less than true voltage when using analog type voltmeter) | Approx. 4.3 |
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| 2V | Knocking (-) | KS | Ignition switch ON (Use digital type voltmeter, because measurement voltage will be detected less than true voltage when using analog type voltmeter) | Below 1.0 |
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| 2W | CKP | CKP sensor |
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| 2X | Ground | Shield wire | Under any condition | Below 1.0 |
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| 2Y | - | - | - | - | - | |||||||
| 2Z | A/F sensor | A/F sensor | Idle after warm-up | Approx. 2.4 |
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| 2AA | - | - | - | - | - | |||||||
| 2AB | CKP sensor ground | CKP sensor | Under any condition | Below 1.0 |
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| 2AC | - | - | - | - | - | |||||||
| 2AD | A/F sensor | A/F sensor | Idle after warm-up | Approx. 2.8 |
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| 2AE(1) | Variable tumble shutter valve monitor | Variable tumble shutter valve switch | variable tumble shutter valve close | B+ |
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| variable tumble shutter valve open | Below 1.0 | |||||||||||
| 2AF | - | - | - | - | - | |||||||
| 2AG | Manifold absolute pressure | MAP sensor | Ignition switch is turned to the ON position (at sea level) | Approx. 4.1 |
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| Idle | Approx. 1.2 | |||||||||||
| 2AH | ECT | ECT sensor | Ignition switch is turned to the ON position | ECT is 20°C {68°F} | Approx. 3.0 |
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| ECT is 80°C {176°F) | Approx. 0.9 | |||||||||||
| 2AI | Generator field coil control | Generator (terminal D) |
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| 2AJ | Generator output voltage | Generator (terminal P) |
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| 2AK | Throttle valve opening angle No. 1 | Throttle body (TP sensor) | Ignition switch is turned to the ON position | Accelerator pedal depressed | Approx. 4.5 |
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| Accelerator pedal released | Approx. 0.5 | |||||||||||
| 2AL | Throttle valve opening angle No. 2 | Throttle body (TP sensor) | Ignition switch is turned to the ON position | Accelerator pedal depressed | Approx. 0.5 |
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| Accelerator pedal released | Approx. 4.5 | |||||||||||
| 2AM | Constant voltage | CMP sensor | Ignition switch is turned to the ON position | B+ |
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| 2AN | - | - | - | - | - | |||||||
| 2AO | Constant voltage (Vref) | Throttle body (TP sensor) | Ignition switch is turned to the ON position | Approx. 5.0 |
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| 2AP | Sensor ground | Throttle body (TP sensor) | Under any condition | Below 1.0 |
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| 2AQ | Constant voltage | CKP sensor | Ignition switch is turned to the ON position | B+ |
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| 2AR | - | - | - | - | - | |||||||
| 2AS | - | - | - | - | - | |||||||
| 2AT | IGT4 | Ignition coil (No. 4 cylinders) |
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| 2AU | Constant voltage (Vref) | MAP sensor | Ignition switch is turned to the ON position | Approx. 5.0 |
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| 2AV | MAP sensor ground | MAP sensor | Under any condition | Below 1.0 |
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| 2AW | IGT2 | Ignition coil (No. 2 cylinders) |
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| 2AX | IGT3 | Ignition coil (No. 3 cylinders) |
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| 2AY | ECT sensor ground | ECT sensor | Under any condition | Below 1.0 |
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| 2AZ | Fuel injection (#4) | Fuel injector No. 4 |
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| 2BA | IGT1 | Ignition coil (No. 1 cylinders) |
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| 2BB | Fuel injection (#1) | Fuel injector No. 1 |
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| 2BC | Fuel injection (#2) | Fuel injector No. 2 |
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| 2BD | Fuel injection (#3) | Fuel injector No. 3 |
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| 2BE | HO2S heater control | HO2S heater | Heavy load (Heater control not operating) | B+ |
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| 2BF | - | - | - | - | - | |||||||
| 2BG | A/F sensor heater control | A/F sensor heater |
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| 2BH | HO2S ground | HO2S | Under any condition | Below 1.0 |
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RENDER: 1.0x
NO RELATED
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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.