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 MANUALSMAZDA20086 S SPORT, 4D HATCHBACK, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 401 (ENGINE CONTROL SYSTEM)PCM INSPECTIONPCM INSPECTION USING THE SST (104 PIN BREAKOUT BOX)
2008 Mazda 6 s Sport, 4D Hatchback, Standard
PCM Inspection Using the SST (104 Pin Breakout Box)
2008 Mazda 6 s Sport, 4D Hatchback, StandardSECTION PCM Inspection Using the SST (104 Pin Breakout Box)
WARNING: This page is about a different car, the 2005 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect the negative battery cable.
- Disconnect the PCM connector.
- Connect the SST (104 Pin Breakout Box) to the PCM as shown.
- Tighten the connector attaching bolt.
Tightening torque
- 3.0-5.4 N.m {30-56 kgf.cm, 27-48 in.lbf}
- Connect the negative battery cable.
- Measure the voltage at each terminal.
- If any incorrect voltage is detected, inspect the related systems, wiring harnesses and connectors referring to the Action column in the terminal voltage table.
Terminal voltage table (Reference)
TERMINAL VOLTAGE
| Terminal | Signal | Connected to | Test condition | Voltage (V) | Inspection item | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | CKP- | CKP sensor |
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| 2 | CMP- | CMP sensor |
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| 3 | Knocking | Knock sensor (-) | IG SW 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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| 4 | Ignition switch | Ignition switch | IG SW ON | B+ |
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| IG SW OFF | Below 0.1 | |||||||||||||
| 5 | A/C | A/C switch | Idle | A/C switch and fan switch ON | Below 1.0 |
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| A/C switch OFF | B+ | |||||||||||||
| 6 | GND | GND | Under any condition | Below 1.0 |
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| 7 | - | - | - | - | - | |||||||||
| 8 | - | - | - | - | - | |||||||||
| 9 | - | - | - | - | - | |||||||||
| 10 | IAT ground | MAF/IAT sensor | Under any condition | Below 1.0 |
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| 11 | MAF | MAF sensor | IG SW ON | 0-0.1 |
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| Idle | 0.5-0.8 | |||||||||||||
| 12 | Fuel tank level | Fuel gauge sender unit | Full fuel | 1.0-1.5 |
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| Half fuel | 2.8-3.4 | |||||||||||||
| Empty fuel | 4.4-4.8 | |||||||||||||
| 13 | - | - | - | - | - | |||||||||
| 14 | - | - | - | - | - | |||||||||
| 15 | IAT | MAF/IAT sensor | IG SW ON | IAT 20 °C {68 °F} | 2.3-2.5 |
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| IAT 30 °C {86 °F} | 1.8-2.0 | |||||||||||||
| 16 | - | - | - | - | - | |||||||||
| 17 | - | - | - | - | - | |||||||||
| 18 | HO2S (Front, RH) | HO2S (Front, RH) |
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| 19 | HO2S (Front, LH) | HO2S (Front, LH) |
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| 20 | Sensor GND | ECT sensor, MAF/IAT sensor, EGR boost sensor, TP sensor, HO2S (Front, Rear (3)), ECT sensor |
Under any condition | Below 1.0 |
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| 21 | Engine speed | Tachometer (in instrument cluster), DLC terminal IG- |
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| 22 | GND | GND | Under any condition | Below 1.0 |
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| 23 | GND | GND | Under any condition | Below 1.0 |
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| 24 | - | - | - | - | - | |||||||||
| 25 | GND | GND | Under any condition | Below 1.0 |
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| 26 | - | - | - | - | - | |||||||||
| 27 | CKP+ | CKP sensor |
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| 28 | CMP+ | CMP sensor |
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| 29 | - | - | - | - | - | |||||||||
| 30 | Refrigerant pressure switch (middle pressure) | Refrigerant pressure switch (middle pressure) | A/C is operating | B+ |
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| 31 | - | - | - | - | - | |||||||||
| 32 | Evaporative emission system leak detection pump (solenoid) | EVAP system leak detection pump | IG SW ON | B+ |
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| Idle | B+ | |||||||||||||
| 33 | Constant voltage (VREF) | TP sensor, EGR boost sensor, | IG SW ON | Approx. 5.0 |
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| 34 | Power supply | Main relay | IG SW ON | B+ |
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| IG SW OFF | Below 1.0 | |||||||||||||
| 35 | - | - | - | - | - | |||||||||
| 36 | Generator field coil control | Generator (terminal D) |
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| 37 | BARO/EGR boost | EGR boost sensor | IG SW ON (Barometric pressure at 102 kPa {765 mmHg, 30 inHg}) | Approx. 4.3 |
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| 38 | - | - | - | - | - | |||||||||
| 39 | - | - | - | - | - | |||||||||
| 40 | Throttle position | TP sensor | IG SW ON | CTP | 0.7-1.2 |
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| WOT | 4.15-4.8 | |||||||||||||
| 41 | ECT | ECT sensor | IG SW ON | ECT 20 °C {68 °F} | 2.9-3.1 |
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| After warm up | 0.2-1.0 | |||||||||||||
| 42 | - | - | - | - | - | |||||||||
| 43 | - | - | - | - | - | |||||||||
| 44 | HO2S (Rear, RH) (3) | HO2S (Rear, RH) | IG SW ON | Below 1.0 |
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| Idle | Engine cold | Approx. 0 | ||||||||||||
| After warm up | 0-0.9 | |||||||||||||
| - (4) | - | - | - | - | ||||||||||
| 45 | HO2S (Rear, LH) (3) | HO2S (Rear, LH) | IG SW ON | Below 1.0 |
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| Idle | Engine cold | Approx. 0 | ||||||||||||
| After warm up | 0-0.9 | |||||||||||||
| - (4) | - | - | - | - | ||||||||||
| 46 | Main relay control | Main relay | IG SW ON | B+ |
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| 47 | A/C control | A/C relay | Idle | A/C switch and fan switch ON | Below 1.0 |
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| A/C switch OFF | B+ | |||||||||||||
| 48 | Fuel injection (#6) | Fuel injector No.6 |
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| 49 | Fuel injection (#4) | Fuel injector No.4 |
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| 50 | Fuel injection (#2) | Fuel injector No.2 |
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| 51 | - | - | - | - | - | |||||||||
| 52 | IGT1 | Ignition coil (No.1 cylinder) |
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| 53 | - | - | - | - | - | |||||||||
| 54 | - | - | - | - | - | |||||||||
| 55 | PSP | PSP switch | IG SW ON | B+ |
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| Idle | Steering wheel at straight ahead position | B+ | ||||||||||||
| While turning steering wheel | Below 1.0 | |||||||||||||
| 56 | - | - | - | - | - | |||||||||
| 57 | HO2S heater (Rear, RH) (3) | HO2S heater (Rear, RH) | Idle | ECT above 70 °C {158 °F} | Below 1.0 |
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| HO2S malfunctioning | B+ | |||||||||||||
| - (4) | - | - | - | - | ||||||||||
| 58 | HO2S heater (Rear, LH) (3) | HO2S heater (Rear, LH) | Idle | ECT above 70 °C {158 °F} | Below 1.0 |
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| HO2S malfunctioning | B+ | |||||||||||||
| - (4) | - | - | - | - | ||||||||||
| 59 | - | - | - | - | - | |||||||||
| 60 | Power supply | Main relay | IG SW ON | B+ |
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| IG SW OFF | Below 1.0 | |||||||||||||
| 61 | - | - | - | - | - | |||||||||
| 62 | - | - | - | - | - | |||||||||
| 63 | Generator output voltage | Generator (terminal P) |
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| 64 (2) | Immobilizer communication | Immobilizer unit | IG SW OFF | Below 1.0 |
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| IG SW ON | B+ | |||||||||||||
| 65 | Generator warning light control | Generator warning light (in instrument cluster) | IG SW ON | Below 1.0 |
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| Idle | B+ | |||||||||||||
| 66 | CAN- | CAN related module | Because this terminal is for communication, good/no good judgment by terminal voltage is not possible. |
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| 67 (1) | Fuel pump control | Fuel pump relay | IG SW ON | B+ |
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| Cranking | Below 1.0 | |||||||||||||
| Idle | Below 1.0 | |||||||||||||
| 68 | MIL control | MIL (in instrument cluster) | IG SW ON | Below 1.0 |
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| Idle | B+ | |||||||||||||
| 69 | Cooling fan control | Fan control module |
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| 70 | ECT | Water temperature gauge (in instrument cluster) |
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| 71 | - | - | - | - | - | |||||||||
| 72 | EGR valve #3 control coil | EGR valve (terminal B) | IG SW ON | B+ |
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| Idle | B+ | |||||||||||||
| 73 | EGR valve #4 coil control | EGR valve terminal F) | IG SW ON | Below 1.0 |
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| Idle | Below 1.0 | |||||||||||||
| 74 | Fuel injection (#5) | Fuel injector No.5 |
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| 75 | Fuel injection (#3) | Fuel injector No.3 |
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| 76 | Fuel injection (#1) | Fuel injector No. 1 |
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| 77 | - | - | - | - | - | |||||||||
| 78 | IGT4 | Ignition coil (No.4 cylinder) |
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| 79 | Vehicle speed | Speedometer (in instrument cluster |
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| 80 | - | - | - | - | - | |||||||||
| 81 | Knocking | Knock sensor (+) | IG SW ON (Use digital type voltmeter, because measurement voltage will be detected less than true voltage when using analog type voltmeter) | Approx. 2.4 |
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| 82 | Brake | Brake switch | Brake pedal depressed | B+ |
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| Brake pedal released | Below 1.0 | |||||||||||||
| 83 | HO2S heater (Front, RH) | HO2S heater (Front, RH) | IG SW ON | B+ |
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| Approx. 15 seconds after engine start with ECT 20-30 °C {68-86 °F} | Below 1.0 | |||||||||||||
| Others | 1.0 < - > B+ | |||||||||||||
| 84 | HO2S heater (Front, LH) | HO2S heater (Front, LH) | IG SW ON | B+ |
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| Approx. 15 seconds after engine start with ECT 20-30 °C {68-86 °F} | Below 1.0 | |||||||||||||
| Others | 1.0 < - > B+ | |||||||||||||
| 85 | Purge control | Purge solenoid valve |
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| 86 | Back-up power supply | Battery (positive terminal) | Under any condition | B+ |
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| 87 | IAC power supply | IAC valve | IG SW ON | B+ |
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| Idle (After warm up and E/L OFF) | B+ | |||||||||||||
| 88 | IAC control | IAC valve |
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| 89 | - | - | - | - | - | |||||||||
| 90 | Torque reduction inhibit | ABS/TCS HU/CM |
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| 91 | Torque reduction request | ABS/TCS HU/CM |
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| 92 | CAN + | TCM | Because this terminal is for communication, good/no good judgment by terminal voltage is not possible. |
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| 93 | EGR boost sensor switching control | EGR boost sensor solenoid valve | IG SW ON | B+ |
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| Idle | B+ | |||||||||||||
| 94 | EVAP system leak detection pump (pump) | EVAP system leak detection pump | IG SW ON | B+ |
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| Idle | B+ | |||||||||||||
| 95 (2) | Fuel pump control | Fuel pump relay | IG SW ON | B+ |
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| Cranking | Below 1.0 | |||||||||||||
| Idle | Below 1.0 | |||||||||||||
| 96 | - | - | - | - | - | |||||||||
| 97 | IMCC control | IMCC actuator | Idle | B+ |
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| Above 3,750 rpm | Below 1.0 | |||||||||||||
| 98 | EGR valve #1 coil control | EGR valve (terminal E) | IG SW ON | Below 1.0 |
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| Idle | Below 1.0 | |||||||||||||
| 99 | EGR valve #2 coil control | EGR valve (terminal A) | IG SW ON | B+ |
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| Idle | B+ | |||||||||||||
| 100 | GND | GND | Under any condition | Below 1.0 |
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| 101 | IGT6 | Ignition coil (No.6 cylinder) |
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| 102 | IGT3 | Ignition coil (No.3 cylinder) |
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| 103 | IGT5 | Ignition coil (No.5 cylinder) |
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| 104 | IGT2 | Ignition coil (No.2 cylinder) |
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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.