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 MANUALSMAZDA2001626 ES V6-2.5L DOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSFUEL TANK PRESSURE SENSORTESTING AND INSPECTIONUSING THE SST (104 PIN BREAKOUT BOX)
2001 Mazda 626 ES V6-2.5L DOHC
Using the SST (104 Pin Breakout Box)
2001 Mazda 626 ES V6-2.5L DOHCSECTION Using the SST (104 Pin Breakout Box)
NOTE: The following vacuum values are indicated by relative pressure from atmospheric pressure.
1. Disconnect the PCM connector.
2. Connect the SST (104 Pin Breakout Box) to the PCM as shown.
3. Tighten the connector bolt.
Tightening torque: 7.9 - 10.7 N.m {80 - 100 kgf.cm, 69.5 - 95.4 in.lbf}
CAUTION: Do not apply vacuum outside of the specified limits. Doing so will damage the fuel tank pressure sensor.
4. Turn the ignition switch to ON.
5. Apply pressure then vacuum to the fuel tank pressure sensor according to the following procedure.
NOTE: The output voltage varies with the measuring condition.
6. Decrease the applied pressure from +6.66 kPa { + 50 mmHg, +1.97 inHg} to -6.66 kPa {-50 mmHg, -1.97 inHg} and verify that the PCM terminal 62 voltage decreases accordingly as specified.
- If not as specified, inspect the following harness continuity and terminal voltage.
- If terminal voltage is correct and if there is harness continuity, replace the fuel tank pressure sensor
a. Harness continuity
- Between PCM terminal 91 and fuel tank pressure sensor terminal A
- Between PCM terminal 62 and fuel tank pressure sensor terminal B
- Between PCM terminal 90 and fuel tank pressure sensor terminal C
- If there is no continuity, repair or replace related harness.
b. Terminal voltage (Ignition switch ON)
- Fuel tank pressure sensor terminal A voltage: Ground (below 1.0 V)
- Fuel tank pressure sensor terminal C voltage: Constant voltage (4.5 - 5.5 V)
- If terminal voltage is incorrect, check the PCM.
1. Disconnect the PCM connector.
2. Connect the SST (104 Pin Breakout Box) to the PCM as shown.
3. Tighten the connector bolt.
Tightening torque: 7.9 - 10.7 N.m {80 - 100 kgf.cm, 69.5 - 95.4 in.lbf}
CAUTION: Do not apply vacuum outside of the specified limits. Doing so will damage the fuel tank pressure sensor.
4. Turn the ignition switch to ON.
5. Apply pressure then vacuum to the fuel tank pressure sensor according to the following procedure.
NOTE: The output voltage varies with the measuring condition.
6. Decrease the applied pressure from +6.66 kPa { + 50 mmHg, +1.97 inHg} to -6.66 kPa {-50 mmHg, -1.97 inHg} and verify that the PCM terminal 62 voltage decreases accordingly as specified.
- If not as specified, inspect the following harness continuity and terminal voltage.
- If terminal voltage is correct and if there is harness continuity, replace the fuel tank pressure sensor
a. Harness continuity
- Between PCM terminal 91 and fuel tank pressure sensor terminal A
- Between PCM terminal 62 and fuel tank pressure sensor terminal B
- Between PCM terminal 90 and fuel tank pressure sensor terminal C
- If there is no continuity, repair or replace related harness.
b. Terminal voltage (Ignition switch ON)
- Fuel tank pressure sensor terminal A voltage: Ground (below 1.0 V)
- Fuel tank pressure sensor terminal C voltage: Constant voltage (4.5 - 5.5 V)
- If terminal voltage is incorrect, check the PCM.
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.