Mazda 3 Workshop Manual page 595

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• Intake-air system and air cleaner
element concerns: obstructions,
leakage or dirtiness
Are all items normal?
Connect the WDS or equivalent to
the DLC-2.
Retrieve any continuous memory,
2
KOEO and KOER DTCs using
WDS or equivalent.
Are there any DTCs displayed?
Is any other drivability concern
3
present?
Connect the WDS or equivalent to
the DLC-2.
Access ECT PID.
Warm up the engine and idle it.
4
Verify ECT PID is correct.
(See PCM INSPECTION
Is ECT PID correct?
Connect the WDS or equivalent to
the DLC-2.
Warm up the engine and idle it.
Access O2S11 PID.
Is O2S11 PID normal?
5
• More than 0.45 V when the
accelerator pedal is suddenly
depressed: rich condition.
• Less than 0.45 V during fuel cut:
lean condition.
Perform the spark test.
(See Spark Test.)
6
Is strong blue spark visible at each
cylinder?
Install fuel pressure gauge
between the fuel pipe and the fuel
7
distributor.
Start the engine and idle it.
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DTC is displayed:
Go to the appropriate DTC inspection.
(See DTC TABLE [LF].)
No DTC is displayed:
Go to the next step.
Go to appropriate symptom troubleshooting.
Go to the next step.
Go to the next step.
Inspect for coolant leakage, cooling fan and
thermostat operation.
Go to the next step.
Inspect and repair or replace the front HO2S,
wiring harness, connector or terminal, then go to
the next step.
(See FRONT HEATED OXYGEN SENSOR
(HO2S) INSPECTION [LF].)
Go to the next step.
Repair or replace the malfunctioning part
according to spark test result.
Go to the next step.
Low:
Inspect the fuel line for clogging.
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