Mazda 3 Workshop Manual page 576

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
Does the idle speed drop or stall when
5
disconnecting the IAC valve?
Disconnect the vacuum hose between the
purge solenoid valve and the intake
manifold from the purge solenoid valve
side.
6
Plug opening end of vacuum hose.
Drive vehicle.
Does engine condition improve?
Connect the WDS or equivalent to the
DLC-2.
Access TP, MAF, VSS, BOO, CPP and
PNP PIDs.
7
Monitor each PID while driving the vehicle.
(See PCM INSPECTION
Are PIDs normal?
8 Verify test results.
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Go to the next step.
Go to the next step.
Inspect the following:
• Circuit from IAC valve to the PCM
terminal 2E or 2F for open and short
• IAC valve for sticking
If normal, go to the next step.
Inspect the evaporative emission control
system.
Go to the next step.
Intermittent concern exists.
(See INTERMITTENT CONCERN
TROUBLESHOOTING
TP PID: Inspect the TP sensor.
(See THROTTLE POSITION (TP)
SENSOR INSPECTION
MAF PID: Inspect the MAF sensor.
(See MASS AIR FLOW (MAF) SENSOR
INSPECTION [LF].)
VSS PID: Inspect the VSS.
(See DTC TABLE [LF].)
BOO PID: Inspect the brake switch.
(See BRAKE SWITCH
CPP PID: Inspect the clutch pedal
position switch.
(See CLUTCH PEDAL POSITION (CPP)
SWITCH INSPECTION
PNP PID: Inspect the neutral switch.
(See NEUTRAL SWITCH INSPECTION
[LF].)
- automotive repair manuals website
[LF].)
[LF].)
INSPECTION.)
[LF].)