Fuel pump control module (diagnostic) signal

Fig 1: Fuel Pump Control Module (Diagnostic) Wave Pattern Signal

Courtesy of MAZDA MOTORS CORP.

PCM terminals 

• 2AX (+) -body ground (-)

Oscilloscope setting 

• 2 V/DIV (Y), 50 ms/DIV (X), DC range

Vehicle condition 

• Idle after warm up