Mazda 3 Workshop Manual page 493

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
Connect the WDS or equivalent to the
DLC-2.
Access ECT PID.
Verify ECT PID is less than 116°C
{241°F} during driving.
Is ECT PID less than specification?
Connect the WDS or equivalent to the
DLC-2.
Access IAT, MAF and SPARKADV PIDs.
2
Monitor each PID.
(See PCM INSPECTION
Are PIDs normal?
Connect the WDS or equivalent to the
DLC-2.
Retrieve any continuous memory, KOEO
3
and KOER DTCs using WDS or
equivalent.
Are there any DTCs displayed?
Is engine compression correct?
4
(See COMPRESSION INSPECTION
[Z6].)
Install fuel pressure gauge between the
fuel pipe and the fuel distributor.
Start engine and idle it.
5
Measure fuel line pressure during idle.
Is fuel line pressure correct during idle?
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No
[Z6].)
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Inspect cooling system for cause of
overheating.
(See NO.17 COOLING SYSTEM
CONCERNS-OVERHEATING
Go to the next step.
IAT PID:
Inspect the IAT sensor.
(See INTAKE AIR TEMPERATURE (IAT)
SENSOR INSPECTION
MAF PID:
Inspect the MAF sensor.
(See MASS AIR FLOW (MAF) SENSOR
INSPECTION [Z6].)
SPARKADV PID:
Inspect the CMP sensor and the knock
sensor.
(See CAMSHAFT POSITION (CMP)
SENSOR INSPECTION
(See KNOCK SENSOR (KS)
INSPECTION [Z6].)
DTC is displayed:
Go to the appropriate DTC inspection.
(See DTC TABLE [Z6].)
No DTC is displayed:
Go to the next step.
Go to the next step.
Inspect for cause.
Inspect ignition timing.
Low:
Inspect the fuel line for clogging.
• If normal, replace fuel pump unit.
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[Z6].)
[Z6].)
[Z6].)