Mazda 3 Workshop Manual page 570

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
Connect the WDS or equivalent to the
DLC-2.
Access MAF PID.
5
Drive vehicle with monitoring PID.
Is MAF PID within specification?
(See PCM INSPECTION
Note
• Following test is for engine
running rough idle with A/C on
concerns. If other symptoms
exist, go to the next step.
Connect pressure gauge to A/C low
and high pressure side lines.
6
Start engine and run it at idle.
Turn A/C switch on.
Measure low side and high side
pressures.
Are pressures within specifications?
(See REFRIGERANT PRESSURE
CHECK.)
Note
• Following test is for engine
running rough with P/S on. If
other symptoms exist, go to the
next step.
7
Start engine and idle it.
Access PSP PID.
Inspect if PSP PID is On while turning
the steering wheel right to left.
Is PSP PID normal?
Visually inspect the CKP sensor and
teeth of crankshaft pulley.
8
Are the CKP sensor and teeth of
crankshaft pulley normal?
Measure the gap between the CKP
sensor and teeth of crankshaft pulley.
9
Specification
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Go to the next step.
Go to the next step.
Inspect for open or short circuit of MAF
sensor and related wiring harness.
Go to the next step.
If A/C is always on, go to symptom
troubleshooting "No.24 A/C is always on or
A/C compressor runs continuously".
(See NO.24 A/C IS ALWAYS ON OR A/C
COMPRESSOR RUNS CONTINUOUSLY
[LF].)
For other symptoms, inspect the following:
• Refrigerant charging amount
• Condenser fan operation
Inspect the EHPAS.
• If there is no malfunction, inspect the
following wiring harnesses:
- Between PCM terminal 1AI and
EHPAS module terminal 1F
- Between PCM terminal 1AM and
EHPAS module terminal 1D
Go to the next step.
Go to the next step.
Replace the malfunctioning part.
Go to the next step.
Adjust the CKP sensor.
(See CRANKSHAFT POSITION (CKP)
SENSOR REMOVAL/INSTALLATION
- automotive repair manuals website
[LF].)