Hi all,
I have a 2002 Mazda B3000 3.0L V6 4x4 Automatic
I have read through some recent threads about this and found great information in the wiring diagrams. Could someone help me with next steps on the information I’ve found below?

• Horn works, and associated fuses are good.
• I have done the diagnostic test, and the test results in 2 Flashes indicating an issue with the Brake Position Sensor.
• Replaced the sensor, and the problem persists.
• Tested the brake pressure sensor (mounted to the master cylinder) and confirmed 12v on when pedal is pressed.
• I disconnected the harness from the brake position sensor and confirmed correct readings at the pins:

• Pin 1 (black): Ground
• Pin 2: 12v switched on when pedal is pressed
• Pin 3: 12v constant
• Pin 4: 12v switched on when pedal is pressed
• Pin 5: 12v constant

I have also disconnected and cleaned the connector at the cruise control servo module under the hood and tested at the pins:

• Pin 4 (Tan/Lt Blue): Should be controlled by the BPP and should read continuity to ground, and 12v when the pedal is pressed, as I understand it. This pin reads 5.3V whether the brake pedal is pressed or not, it does not change.

It seems like the brake position sensor is working correctly based on the testing I do at the pins in the cabin, but the ground reference / 12V is not making it to Pin 4 at the CC servo unit. Could anyone point me in the right direction for additional connection points or probing?

Thank you!

 

Updated original post with more diligent research on the site, and new findings.

 

Update:
I traced the wiring path from Pin 4 of the Servo back to the BPP switch, and found an open on the Red/Lt Green wire somewhere between the BPP and the Clutch Switch Jumper.
I installed a bypass wire around the open, and am now successfully able to see 12v On/off at Pin 4 of the Servo when pressing the brake pedal.

However… The Cruise Control now works exactly 1 time after starting the vehicle. I can Set, Coast, or Accellerate…. But if I tap the brake pedal, the cruise disengages and then will not re-engage until I shut the car off and re-start the engine.

Although the Cruise does function, the diagnostic test still returns 2 flashes indicating the old fault. I am not sure whether this “code” is stored in the cruise control servo itself, or if this lives in the ECM. The Red/Lt Green wire coming from the BPP hits “Engine Controls” on the schematic before passing to the clutch jumper.

Disconnecting the battery neutral for 30 minutes didn’t resolve it, nor did a “Clear All Codes” command via my BlueDriver OBDII reader. Perhaps this needs to be cleared by a more advanced diagnostic tool in order for the cruise to work consistently?

Anyone have any ideas?

 

No love!?