Operation CHARM: Car repair manuals for everyone.
Home >> Mazda >> 2005 >> 3 L4-2.0L >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Oscilloscope Patterns and Waveforms

Oscilloscope Patterns and Waveforms

INSPECTION USING AN OSCILLOSCOPE (REFERENCE)




Shift Solenoid A signal
PCM Terminals
- 1B (+) - Negative battery terminal (-)

Oscilloscope setting
- 5 V/DIV (Y), 5 ms/DIV (X), DC range

Vehicle condition
- 4GR




Shift solenoid B signal
PCM terminals
- 1C (+) - Negative battery terminal (-)

Oscilloscope setting
- 5 V/DIV (Y), 5 ms/DIV (X), DC range

Vehicle condition
- 1GR




Shift solenoid C signal
PCM terminals
- 1 D (+) - Negative battery terminal (-)

Oscilloscope setting
- 5 V/DIV (Y), 5 ms/DIV (X), DC range

Vehicle condition
- 1GR or 2GR




Pressure control solenoid (+) signal
PCM terminals
- 1G (+) - Negative battery terminal (-)

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

Vehicle condition
- All of the following conditions are met.
- Ignition switch is turned to the ON position. (engine off)
- P or N position
- CTP




Pressure control solenoid (-) signal
PCM terminals
- 1 H (+) - Negative battery terminal (-)

Oscilloscope setting
- 200 mV/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition
- All of the following conditions are met.
- Ignition switch is turned to the ON position. (engine off)
- P or N position
- CTP




Vehicle speed signal (ATX)
PCM terminals
- 1J (+) - Negative battery terminal (-)

Oscilloscope setting
- 1 V/DIV (Y), 2.5 ms/DIV (X), DC range

Vehicle condition
- Vehicle speed is 32 km/h {20 mph}




Vehicle speed signal (MTX)
PCM terminals
- 1J(+) - 1N(-)

Oscilloscope setting
- 1 V/DIV (Y), 10 ms/DIV (X), DC range

Vehicle condition
- Vehicle speed is 10 km/h {6.2 mph}




Input/turbine speed sensor (+) signal
PCM terminals
- 1 M (+) - Negative battery terminal (-)

Oscilloscope setting
- 500 mV/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition
- Idle after warm-up




Input/turbine speed sensor (-) signal
PCM terminals
- 1Q (+) - Negative battery terminal (-)

Oscilloscope setting
- 500 mV/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition
- Idle after warm-up




Cooling fan control signals
PCM terminals
- 1W(+) - 1AA(-)

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

Vehicle condition
- Idle after warm up (engine speed approx. 700 rpm, A/C ON)




APP signal
Accelerator pedal is released




Accelerator pedal is depressed
PCM terminals
- 1AL(+) - 2AA(-)

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

Vehicle condition
- Ignition switch is turned to the ON position. (engine off)




HO2S (front) heater control signal (California emission regulation applicable model)
PCM terminals
- 2G(+) - 2AA(-)

Oscilloscope setting
- 5 V/DIV (Y), 50 ms/DIV (X), DC range

Vehicle condition
- Idle after warm up (engine speed approx. 650 rpm, no load)




HO2S (front) heater control signal (except for California emission regulation applicable model)
PCM terminals
- 2G(+) - 2AA(-)

Oscilloscope setting
- 5 V/DIV (Y), 125 ms/DIV (X), DC range

Vehicle condition
- Idle after warm up (engine speed approx. 650 rpm, no load)




CMP sensor signal

(+)

PCM terminals
- 2U(+) - 2AA(-)

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

Vehicle condition
- Idle after warm up (engine speed approx. 650 rpm, no load)

(-)




PCM terminals
- 2V(+) - 2AA(-)

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

Vehicle condition
- Idle after warm up (engine speed approx. 650 rpm, no load)




CKP sensor signal

(+)
PCM terminals
- 2Y(+) - 2AA(-)

Oscilloscope setting
- 2 V/DIV (Y), 10 ms/DIV (X), DC range

Vehicle condition
- Idle after warm up (engine speed approx. 650 rpm, no load)

(-)




PCM terminals
- 2Z(+) - 2AA(-)

Oscilloscope setting
- 2 V/DIV (Y), 10 ms/DIV (X), DC range

Vehicle condition
- Idle after warm up (engine speed approx. 650 rpm, no load)




OCV signal
PCM terminals
- 2AF(+) - 2AA(-)

Oscilloscope setting
- 2.5 V/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition
- Idle after warm up (engine speed approx. 650 rpm, no load)




HO2S (front) signal (except for California emission regulation applicable model)
PCM terminals
- 2AG(+) - 2AA(-)

Oscilloscope setting
- 0.2 V/DIV (Y), 500 ms/DIV (X), DC range

Vehicle condition
- Idle after warm up (engine speed approx. 650 rpm, no load)




Generator output voltage signal
PCM terminals
- 2AM (+) - 2AA (-)

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

Vehicle condition
- Idle after warm up (engine speed approx. 650 rpm, no load)




Purge control signal
PCM terminals
- 2AN (+) - Negative battery terminal (-)

Oscilloscope setting
- 2 V/DIV (Y), 0.1 s/DIV (X), DC range

Vehicle condition
- Idle after warm-up




Generator field coil control signal
PCM terminals
- 2AQ(+) - 2AA(-)

Oscilloscope setting
- 0.5 V/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition
- Idle after warm up (engine speed approx. 650 rpm, no load)




Fuel injection control
PCM terminals (California emission regulation applicable model)
- Fuel injection No.1: 2AW(+) - 1 AZ(-)
- Fuel injection No.2: 2AS(+) - 1 AZ(-)
- Fuel injection No.3: 2AX(+) - 1 AZ(-)
- Fuel injection No.4: 2AT(+) - 1 AZ(-)

PCM terminals (except for California emission regulation applicable model)
- Fuel injection No.1: 2BB(+) - 1 AZ(-)
- Fuel injection No.2: 2BC(+) - 1AZ(-)
- Fuel injection No.3: 2BD(+) - 1AZ(-)
- Fuel injection No.4: 2AZ(+) - 1AZ(-)

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

Vehicle condition
- Idle after warm up (engine speed approx. 650 rpm, no load)




IGT1, IGT2, IG3, IG4 control signals

PCM terminals (California emission regulation applicable model)
- IGT1 (No.1):2BE(+) - 1BC(-)
- IGT2(No.2):2BF(+) - 1BB(-)
- IGT3(No.3):2BG(+) - 1BB(-)
- IGT4(No.4):2BH(+) - 1BC(-)

PCM terminals (except for California emission regulation applicable model)
- IGT1 (No.1):2BE(+) - 1BG(-)
- IGT2(No.2):2BF(+) - 1BC(-)
- IGT3(No.3):2BG(+) - 1BC(-)
- IGT4(No.4):2BH(+) - 1BG(-)

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

Vehicle condition
- Idle after warm up (engine speed approx. 650 rpm, no load)
pro multis · About Operation CHARM