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Home >> Mazda >> 2017 >> CX-5 Grand Select, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 109 (On-Board Diagnostic - Two-Step Deployment Control System) >> DTC B1226-11; B1226-13; B1226-87; B1226-96: Driver-Side Pressure Sensor Circuit Malfunction >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC PROCEDURE

Step Inspection Action
1 INSPECT DRIVER-SIDE PRESSURE SENSOR CONNECTOR
WARNING:
Yes Replace the malfunctioning part, then go to Step 5.
No Go to the next step.
2 INSPECT DRIVER-SIDE PRESSURE SENSOR CIRCUIT FOR SHORT TO GROUND Yes Refer to the wiring diagram and verify whether or not there is a common connector between SAS control module terminal and driver-side pressure sensor terminal.
If there is a common connector:
  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
  • Replace the malfunctioning part.

    If there is no common connector:

  • Replace the wiring harness which has a short to ground.

Go to Step 5.
No Go to the next step.
3 INSPECT DRIVER-SIDE PRESSURE SENSOR CIRCUIT FOR OPEN CIRCUIT
  • Driver-side pressure sensor and SAS control module connectors are disconnected.
  • Inspect for continuity between the following terminals (wiring harness-side):
    • Driver-side pressure sensor terminal A-SAS control module terminal 1S
      • Driver-side pressure sensor terminal B-SAS control module terminal 1R
    NOTE:
    • Inspect for continuity while shaking the wiring harness between the SAS control module and driver-side pressure sensor.
  • Is there continuity?
 Yes Go to the next step.
No Refer to the wiring diagram and verify whether or not there is a common connector between SAS control module terminal and driver-side pressure sensor terminal.
If there is a common connector:
  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
  • Replace the malfunctioning part.

    If there is no common connector:

  • Replace the wiring harness which has an open circuit.

Go to Step 5.
4 INSPECT DRIVER-SIDE PRESSURE SENSOR CIRCUIT FOR SHORT TO POWER SUPPLY
  • Driver-side pressure sensor and SAS control module connectors are disconnected.
  • Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .)
  • Switch the ignition ON (engine off or on).
  • Measure the voltage at the following terminals (wiring harness-side):
    • SAS control module terminal 1R
      • SAS control module terminal 1S
    NOTE:
    • Measure the voltage while shaking the wiring harness between the SAS control module and driver-side pressure sensor.
  • Is the voltage 0 V?
 Yes Replace the driver-side pressure sensor, then go to the next step. (See PRESSURE SENSOR REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM] .)
No Refer to the wiring diagram and verify whether or not there is a common connector between SAS control module terminal and driver-side pressure sensor terminal.
If there is a common connector:
  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply.
  • Replace the malfunctioning part.

    If there is no common connector:

  • Replace the wiring harness which has a short to power supply.

Go to the next step.
5 PERFORM SAS CONTROL MODULE DTC INSPECTION Yes Repeat the inspection from Step 1.
No DTC troubleshooting completed.
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