Mazda 3 Workshop Manual page 580

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
Access RPM, VPWR, MAF, TP and
VSS PIDs.
Drive the vehicle with monitoring
PIDs.
Are PIDs within specifications?
(See PCM INSPECTION
Visually inspect the CKP sensor and
teeth of crankshaft pulley.
5
Are the CKP sensor and teeth of
crankshaft pulley normal?
Measure the gap between the CKP
sensor and teeth of crankshaft pulley.
Specification
6
0.5-1.9 mm {0.020-0.75 in}
Is the gap within specification?
Inspect spark plug conditions.
7
Is the spark plug wet, covered with
carbon or grayish white?
Remove and shake the PCV valve.
8
Does the PCV valve rattle?
Verify that throttle lever is resting on
9 throttle valve stop screw and/or
throttle valve orifice plug.
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Inspect the CKP sensor and related wiring
harness for such as vibration, intermittent
open/short circuit.
VPWR PID:
Inspect for open circuit intermittently.
MAF PID:
Inspect for open circuit of the MAF sensor
and related wire harness intermittently.
TP PID:
Inspect if output signal from the TP sensor
changes smoothly.
VSS PID:
Inspect for open circuit of the VSS and related
wire harness intermittently.
Go to the next step.
Replace the malfunctioning part.
Go to the next step.
Adjust the CKP sensor.
Spark plug is wet or covered with carbon:
Inspect for fuel leakage from the fuel injector.
Spark plug is grayish white:
Inspect the fuel injector for clogging.
Install the spark plugs on original cylinders.
Go to the next step.
Go to the next step.
Replace the PCV valve.
Go to the next step.
Adjust if necessary.
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