Mazda 3 Workshop Manual page 496

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
Access ECT PID.
Drive vehicle while monitoring PID.
3
(See PCM INSPECTION
Is PID within specification?
Perform the spark test.
(See Spark Test.)
4
Is strong blue spark visible at each
cylinder?
Install fuel pressure gauge between the
fuel pipe and the fuel distributor.
Start the engine and idle it.
5 Measure fuel line pressure during idle.
Is fuel line pressure correct during idle?
(See FUEL LINE PRESSURE
INSPECTION.)
Inspect for variable tumble control
operation.
(See Variable Tumble Control Operation
6
Inspection.)
Does variable tumble control function
properly?
Inspect for variable valve timing control
system operation.
(See Variable Valve Timing Control
7
System Operation
Does the variable valve timing control
system function properly?
Inspect for variable intake-air control
operation.
(See Variable Intake-air Control
8
Operation Inspection.)
Does the variable control function
properly?
9 Remove and shake the PCV valve.
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Inspection.)
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Go to the next step.
Inspect for coolant leakage, cooling fan
operations or thermostat operation.
Go to the next step.
Repair or replace the malfunctioning part
according to spark test results.
Go to the next step.
Low:
Inspect for clogged fuel line.
• If normal, replace fuel pump unit.
(See FUEL PUMP UNIT
REMOVAL/INSTALLATION.)
High:
Replace fuel pump unit.
(See FUEL PUMP UNIT
REMOVAL/INSTALLATION.)
Go to the next step.
Repair or replace the malfunctioning part.
Go to the next step.
Repair or replace the malfunctioning part.
Go to the next step.
Repair or replace the malfunctioning part.
Go to the next step.
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