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.
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HOMESERVICE MANUALSMAZDA1999626 ES, 2.5 D, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 403 (ENGINE CONTROL SYSTEM)PCM INSPECTIONPCM INSPECTION USING THE SST (104 PIN BREAKOUT BOX)
1999 Mazda 626 ES, 2.5 D, Standard
PCM Inspection Using the SST (104 Pin Breakout Box)
1999 Mazda 626 ES, 2.5 D, 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.