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 MANUALSMAZDA20105 SPORT, 2.3 L, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCEENGINE CONTROL SYSTEMSENGINE CONTROL SYSTEM [L3]PCM INSPECTIONWITHOUT USING M-MDS
2010 Mazda 5 Sport, 2.3 L, Standard
Without Using M-MDS
2010 Mazda 5 Sport, 2.3 L, StandardSECTION Without Using 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.
TERMINALS REFERENCE
| Terminal | Signal | Connected to | Test condition | Voltage (V) | Inspection item | |||||||
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| 1A | Main relay control | Main relay | Ignition switch OFF | Below 1.0 |
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| Ignition switch ON | B+ | |||||||||||
| 1B | - | - | - | - | - | |||||||
| 1C | Back-up power supply | Battery (positive terminal) | Under any condition | B+ |
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| 1D | - | - | - | - | - | |||||||
| 1E | Ground | Ground | Under any condition | Below 1.0 |
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| 1F | Ground | Ground | Under any condition | Below 1.0 |
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| 1G | Ground | Ground | Under any condition | Below 1.0 |
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| 1H | - | - | - | - | - | |||||||
| 1I | A/C | A/C relay | Idle | A/C operating | Below 1.0 |
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| A/C not operating | B+ | |||||||||||
| 1J | - | - | - | - | - | |||||||
| 1K | - | - | - | - | - | |||||||
| 1L | EVAP leak detection pump (solenoid) | EVAP leak detection pump | Ignition switch to the ON position | B+ |
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| Idling | B+ | |||||||||||
| 1M | - | - | - | - | - | |||||||
| 1N | - | - | - | - | - | |||||||
| 1O | - | - | - | - | - | |||||||
| 1P | Sensor ground | MAF sensor | Under any condition | Below 1.0 |
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| 1Q | Main relay control | Main relay | Ignition switch OFF | B+ |
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| Ignition switch ON | Below 1.0 | |||||||||||
| 1R | Cooling fan control | Fan control module |
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| 1S | - | - | - | - | - | |||||||
| 1T | - | - | - | - | - | |||||||
| 1U | - | - | - | - | - | |||||||
| 1V | - | - | - | - | - | |||||||
| 1W | - | - | - | - | - | |||||||
| 1X | EVAP leak detection pump (pump) | EVAP leak detection pump | Ignition switch to the ON position | B+ |
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| Idling | B+ | |||||||||||
| 1Y | - | - | - | - | - | |||||||
| 1Z | - | - | - | - | - | |||||||
| 1AA | - | - | - | - | - | |||||||
| 1AB | Brake | Brake switch | Brake pedal released | Below 1.0 |
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| Brake pedal depressed | B+ | |||||||||||
| 1AC | - | - | - | - | - | |||||||
| 1AD | - | - | - | - | - | |||||||
| 1AE | - | - | - | - | - | |||||||
| 1AF | - | - | - | - | - | |||||||
| 1AG | - | - | - | - | - | |||||||
| 1AH | - | - | - | - | - | |||||||
| 1AI | CAN (L) | Instrument cluster, ABS HU/CM | Because this terminal is for CAN, good/no good judgment by terminal voltage is not possible. | - | ||||||||
| 1AJ | - | - | - | - | - | |||||||
| 1AK | MAF | MAF sensor | Ignition switch ON | Approx. 0.7 |
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| Idle (after warm up) | Approx. 1.2 | |||||||||||
| 1AL | Constant voltage (Vref) | APP sensor | Ignition switch ON | Approx. 5.0 |
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| 1AM | CAN (H) | Instrument cluster, ABS HU/CM | Because this terminal is for CAN, good/no good judgment by terminal voltage is not possible. | - | ||||||||
| 1AN | - | - | - | - | - | |||||||
| 1AO | APP (No. 2) | APP sensor (No. 2) |
(See INSPECTION USING AN OSCILLOSCOPE (REFERENCE) ) |
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| 1AP | APP (No. 1) | APP sensor (No. 1) | Ignition switch to the ON position | Accelerator pedal released | Approx. 0.4 |
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| Accelerator pedal depressed | Approx. 3.3 | |||||||||||
| 1AQ | Cruise control switch | Cruise control switch | Ignition switch to the ON position | Cruise main switch ON | Approx. 0 |
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| Cancel switch ON | Approx. 1.8 | |||||||||||
| Set/Cost switch ON | Approx. 3.8 | |||||||||||
| Res/Ace switch ON | Approx. 4.6 | |||||||||||
| Other | Approx. 5.0 | |||||||||||
| 1AR | - | - | - | - | - | |||||||
| 1AS | - | - | - | - | - | |||||||
| 1AT | IAT | IAT sensor | Ignition switch ON | IAT 20 °C {68 °F} | Approx. 2.38 |
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| IAT 60 °C {140 °F} | Approx. 0.89 | |||||||||||
| 1AU | - | - | - | - | - | |||||||
| 1AV | Sensor ground | APP sensor, IAT sensor | Under any condition | Below 1.0 |
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| 1AW | Refrigerant pressure switch (high and low) | Refrigerant pressure switch (high and low) | Idle | A/C operation | Below 1.0 |
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| A/C not operation | B+ | |||||||||||
| 1AX | Refrigerant pressure switch (middle) | Refrigerant pressure switch (middle) | A/CON | Refrigerant pressure is above 1.52 MPa {15.5 kgf/cm2 , 220 psi} | Below 1.0 |
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| Refrigerant pressure is below 1.23 MPa {12.5 kgf/cm2 , 178 psi} | B+ | |||||||||||
| 1AY | Ignition switch | Ignition switch | Ignition switch off | Below 1.0 |
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| Ignition switch to the ON position | B+ | |||||||||||
| 1AZ | Drive-by-wire relay control | Drive-by-wire relay | Ignition switch off | B+ |
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| Ignition switch to the ON position | Below 1.0 | |||||||||||
| 1BA | - | - | - | - | - | |||||||
| 1BB | Starter relay control | Starter relay | Under any condition | Below 1.0 |
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| 1BC(1) | Neutral position | Neutral switch | Shift lever is at neutral position | Below 1.0 |
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| 1BD(1) | Clutch operation | CPP switch | Clutch pedal depressed | Below 1.0 |
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| Clutch pedal released | B+ | |||||||||||
| 1BE | Ground | Ground | Under any condition | Below 1.0 |
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| 1BF | Drive-by-wire relay power supply | Drive-by-wire relay | Ignition switch OFF | Below 1.0 |
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| Ignition switch to the ON position | B+ | |||||||||||
| 1BG | Fuel pump control | Fuel pump relay | Ignition switch ON | B+ |
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| Cranking | Below 1.0 | |||||||||||
| Idle | Below 1.0 | |||||||||||
| 1BH | - | - | - | - | - | |||||||
| 2A | A/F sensor heater control | A/F sensor heater |
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| 2B | HO2S heater control | HO2S heater |
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| 2C | Purge control | Purge solenoid valve |
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| 2D | - | - | - | - | - | |||||||
| 2E | OCV | OCV |
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| 2F | - | - | - | - | - | |||||||
| 2G | IGT1 | Ignition coil (No. 1 cylinders) |
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| 2H | IGT4 | Ignition coil (No. 4 cylinders) |
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| 2I | Variable tumble control | Variable tumble solenoid valve | ECT below 63 °C {145 °F} and engine speed below 3,750 rpm | B+ |
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| ECT above 63 °C {145 °F} or engine speed above 3,750 rpm | Below 1.0 | |||||||||||
| 2J | Variable intake air control | Variable intake air solenoid valve | Engine speed: below 4,600 rpm | Below 1.0 |
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| Engine speed: above 4,600 rpm | B+ | |||||||||||
| 2K | IGT2 | Ignition coil (No. 2 cylinders) |
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| 2L | IGT3 | Ignition coil (No. 3 cylinders) |
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| 2M | - | - | - | - | - | |||||||
| 2N | - | - | - | - | - | |||||||
| 2O | - | - | - | - | - | |||||||
| 2P | - | - | - | - | - | |||||||
| 2Q | HO2S | HO2S | Idle (after warm up) | Alternates between 0 and 1.0 |
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| 2R(3) | Variable tumble shutter valve monitor | Variable tumble shutter valve switch | ECT below 63 °C {145 °F} and engine speed below 3,750 rpm | B+ |
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| 2S | CMP | CMP sensor |
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| 2T | - | - | - | - | - | |||||||
| 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 | Shield wire | A/F sensor, KS | Under any condition | Below 1.0 |
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| 2Y | - | - | - | - | - | |||||||
| 2Z | A/F sensor power supply | A/F sensor | Idle (after warm up) | Approx. 4.1 |
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| 2AA | Generator field coil control | Generator |
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| 2AB | - | - | - | - | - | |||||||
| 2AC | A/F sensor | A/F sensor | Idle (after warm up): Approx. 0 mA |
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| 2AD | A/F sensor | A/F sensor |
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| 2AE(2) | Variable tumble shutter valve monitor | Variable tumble shutter valve switch | ECT below 63 °C {145 °F} and engine speed below 3,750 rpm | B+ |
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| ECT above 63 °C {145 °F} or engine speed above 3,750 rpm | Below 1.0 | |||||||||||
| 2AF | Generator output voltage | Generator |
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| 2AG | Manifold absolute pressure | MAP sensor | Ignition switch ON (at sea level) | Approx. 4.1 |
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| Idle | Approx. 1.4 | |||||||||||
| 2AH | ECT | ECT sensor | Ignition switch ON | ECT 20 °C {68 °F} | 3.04-3.14 |
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| ECT 80 °C {176 °F} | 0.76-0.83 | |||||||||||
| 2AI | - | - | - | - | - | |||||||
| 2AJ | - | - | - | - | - | |||||||
| 2AK | TP(No. 1) | TP sensor (No. 1) | Ignition switch ON | CTP | Approx. 0.6 |
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| WOT | Approx. 4.4 | |||||||||||
| 2AL | TP (No. 2) | TP sensor (No. 2) | Ignition switch ON | CTP | Approx. 4.4 |
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| WOT | Approx. 0.6 | |||||||||||
| 2AM | Constant voltage (Vref) | CMP sensor | Ignition switch ON | B+ |
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| 2AN | - | - | - | - | - | |||||||
| 2AO | Constant voltage (Vref) | TP sensor | Under any condition | Approx. 5.0 |
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| 2AP | Sensor ground | TP sensor | under any condition | Below 1.0 |
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| 2AQ | Constant voltage (Vref) | CKP sensor | Ignition switch ON | B+ |
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| 2AR | - | - | - | - | - | |||||||
| 2AS(3) | HO2S GND | HO2S | Under any condition | Below 1.0 |
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| 2AT | EGR valve #3 coil control | EGR valve | Idle | B+ |
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| 2AU | Constant voltage (Vref) | MAP sensor | Ignition switch ON | B+ |
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| 2AV | Sensor ground | ECT sensor, MAP sensor, HO2S, variable tumble shutter valve switch | under any condition | Below 1.0 |
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| 2AW | EGR valve #4 coil control | EGR valve | Idle | B+ |
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| 2AX | EGR valve #1 coil control | EGR valve | Idle | Below 1.0 |
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| 2AY | - | - | - | - | - | |||||||
| 2AZ | Fuel injection (#4) | Fuel injector No. 4 |
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| 2BA | EGR valve #2 coil control | EGR valve | Idle | B+ |
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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 | Throttle valve actuator control (+) | Throttle body (Throttle valve actuator) | Ignition switch ON | B+ |
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| 2BF | Throttle valve actuator control (-) | Throttle body (Throttle valve actuator) | Idle (after warm up) | 3.5-5.5 |
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| 2BG(3) | OCV control | OCV | Ignition switch ON | B+ |
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| 2BH | - | - | - | - | - | |||||||
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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.