PCM And Generator Shearing Inspection

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Connect the M-MDS to the DLC-2.
Inspect as follows:

Fig 1: Connecting M-MDS To DLC-2

Courtesy of MAZDA MOTORS CORP.

GENERATOR INSPECTION CHART

Step

Inspection

Action

Measure the generator terminal B voltage when the electrical loads⁽¹⁾ are on and off.

15 V or more

Go to Step 2.

13-15 V

Normal⁽²⁾

13 V or less

Go to Step 3.

Monitor the ALTT V PID using the M-MDS, see ON-BOARD DIAGNOSTIC TEST [L5] . or measure the PCM 2AF terminal waveform using an oscilloscope. See PCM INSPECTION [L5] .
Is the value normal?

Yes

Go to Step 4.

PCM input error.

Monitor the ALTT V PID using the M-MDS, see ON-BOARD DIAGNOSTIC TEST [L5] . or measure the PCM 2AF terminal waveform using an oscilloscope. See PCM INSPECTION [L5] .
Is the value normal?

Yes

Go to Step 5.

PCM input error.

Monitor the ALTF PID using the M-MDS, or calculate the duty value of the PCM terminal 2AA using an oscilloscope. Is the duty value 100%?

Courtesy of MAZDA MOTORS CORP.

Yes

PCM input error.

PCM, generator, or both are not normal

Monitor the ALTF PID using the M-MDS, or calculate the duty value of the PCM terminal 2AA using an oscilloscope. Is the duty value 0%?

Courtesy of MAZDA MOTORS CORP.

Yes

PCM input error.

PCM, generator, or both are not normal

⁽¹⁾	Headlights, blower motor, rear window defroster, brake lights, etc.

⁽²⁾	If the generator field coil duty value does not change when electrical loads (such as headlights, blower motor, rear window defroster, brake lights) are on or off, inspection with discharged battery is needed.