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 MANUALSMAZDA2011CX-7 I SV, 2.5 5REPAIR AND DIAGNOSISENGINE PERFORMANCEENGINE CONTROL SYSTEMSENGINE CONTROL SYSTEM [L5]PCM INSPECTIONINSPECTION USING AN OSCILLOSCOPE (REFERENCE)

2011 Mazda CX-7 i SV, 2.5 5

Inspection Using An Oscilloscope (Reference)

2011 Mazda CX-7 i SV, 2.5 5SECTION Inspection Using An Oscilloscope (Reference)

Cooling fan control

PCM terminals

1 R (+)-body ground (-)

Oscilloscope setting

5 V/DIV (Y), 20 ms/DIV (X), DC range

Vehicle condition

Idle after warm up

Fig 1: Identifying Signal Waveform
Courtesy of MAZDA MOTORS CORP.

APP sensor No. 2 signal

Accelerator pedal released

Fig 2: Identifying Signal Waveform

Courtesy of MAZDA MOTORS CORP.

Accelerator pedal depressed

PCM terminals

1AO (+)-body ground (-)

Oscilloscope setting

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

Vehicle condition

Turn the ignition switch to the ON position.

Fig 3: Identifying Signal Waveform
Courtesy of MAZDA MOTORS CORP.

Purge control

PCM terminals

1 BA (+)-body ground (-)

Oscilloscope setting

10 V/DIV (Y), 20 ms/DIV (X), DC range

Vehicle condition

Idle after warm up

Fig 4: Identifying Signal Waveform

Courtesy of MAZDA MOTORS CORP.

A/F sensor heater control

PCM terminals

2A (+)-body ground (-)

Oscilloscope setting

5 V/DIV (Y), 200 ms/DIV (X), DC range

Vehicle condition

Idle (immediately after starting the engine)

Fig 5: Identifying Signal Waveform

Courtesy of MAZDA MOTORS CORP.

HO2S heater control

PCM terminals

2B (+)-body ground (-)

Oscilloscope setting

5 V/DIV (Y), 1 s/DIV (X), DC range

Vehicle condition

Idle (immediately after starting the engine)

Fig 6: Identifying Signal Waveform

Courtesy of MAZDA MOTORS CORP.

OCV control signal

PCM terminals

2E (+)-body ground (-)

Oscilloscope setting

2 V/DIV (Y), 0.8 ms/DIV (X), DC range

Vehicle condition

Idle after warm up

Fig 7: Identifying Signal Waveform

Courtesy of MAZDA MOTORS CORP.

IGT1, IGT2, IGT3, IGT4 control

PCM terminals

IGT1 (ignition coil No. 1): 2G (+)-body ground (-)

IGT2(ignition coil No. 2): 2K (+)-body ground (-)

IGT3(ignition coil No. 3): 2L (+)-body ground (-)

IGT4(ignition coil No. 4): 2H (+)-body ground (-)

Oscilloscope setting

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

Fig 8: Identifying Signal Waveform

Courtesy of MAZDA MOTORS CORP.

Vehicle condition

Idle after warm up

CMP signal

PCM terminals

2S (+)-body ground (-)

Oscilloscope setting

1 V/DIV (Y), 25 ms/DIV (X), DC range

Vehicle condition

Idle after warm up

Fig 9: Identifying Signal Waveform

Courtesy of MAZDA MOTORS CORP.

CKP signal

PCM terminals

2W (+)-body ground (-)

Oscilloscope setting

1 V/DIV (Y), 5 ms/DIV (X), DC range

Vehicle condition

Idle after warm up

Fig 10: Identifying Signal Waveform

Courtesy of MAZDA MOTORS CORP.

Generator field coil control

PCM terminals

2AA (+)-body ground (-)

Oscilloscope setting

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

Vehicle condition

Idle after warm up

Fig 11: Identifying Signal Waveform

Courtesy of MAZDA MOTORS CORP.

Generator output voltage

PCM terminals

2AF (+)-body ground (-)

Oscilloscope setting

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

Vehicle condition

Idle after warm up

Fig 12: Identifying Signal Waveform

Courtesy of MAZDA MOTORS CORP.

Fuel injection (#1, #2, #3, #4) control

PCM terminals

Fuel Injection No. 1: 2BB (+)-body ground (-)

Fuel Injection No. 2: 2BC (+)-body ground (-)

Fuel Injection No. 3: 2BD (+)-body ground (-)

Fuel Injection No. 4: 2AZ (+)-body ground (-)

Oscilloscope setting

10 V/DIV (Y), 25 ms/DIV (X), DC range

Vehicle condition

Idle after warm up

Fig 13: Identifying Signal Waveform

Courtesy of MAZDA MOTORS CORP.

RENDER: 1.0x

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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.