Mazda 3 Workshop Manual page 589

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
The following troubleshooting flow chart contains the fuel system diagnosis and repair
procedures. Read the following warnings before performing the fuel system services:
Diagnostic procedure
STEP INSPECTION
Connect the WDS or equivalent to the
DLC-2.
Access ECT PID.
1
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.
3 Retrieve any continuous memory, KOEO
and KOER DTCs using WDS or equivalent.
Are there any DTCs displayed?
4 Is engine compression correct?
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• Fuel vapor is hazardous. It can easily ignite, causing serious injury and
damage. Always keep sparks and flames away from fuel.
• Fuel line spills and leakage are dangerous. Fuel can ignite and cause
serious injuries or death and damage. Fuel can also irritate skin and eyes. To
prevent this, always complete "BEFORE SERVICE PRECAUTION" and
"AFTER SERVICE PRECAUTION" described in this manual.
(See BEFORE SERVICE
(See AFTER SERVICE PRECAUTION.)
Caution
• Disconnecting/connecting quick release connector without cleaning it may
possibly cause damage to fuel pipe and quick release connector. Always clean
quick release connector joint area before disconnecting/connecting, and make
sure that it is free of foreign material.
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PRECAUTION.)
RESULTS
Yes Go to the next step.
Inspect the cooling system for cause of
No
overheating.
Yes Go to the next step.
IAT PID: Inspect IAT sensor.
MAF PID: Inspect MAF sensor.
No
SPARKADV PID: Inspect CMP sensor
and knock sensor.
DTC is displayed:
Yes
Go to the appropriate DTC inspection.
(See DTC TABLE
No DTC is displayed:
No
Go to the next step.
Yes Go to the next step.
No Inspect for cause.
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ACTION
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