Mazda 626 Station Wagon, Workshop Manual

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TROUBLESHOOTING
STEP INSPECTION ACTION f1
15 • W hen engine cannot be started,
inspect intake-air system fo r air
leakage.
• W hen engine can be started, carry out
intake manifold vacuum inspection.
• Is air sucked in from intake-air
system ?
Yes
Repair or replace malfunctioning part.
No Go to next step.
16 • C arry out fuel line pressure inspection.
• Is fuel line pressure correct?
Fuel line pressure
210—260 kPa {2.1—2.6 kgf/cm2, 30—36 psl}
Yes Inspect following PIDs.
• ECT
• ECT V
• FH02S or 02SII
• MAF
• MAF V
(See F1-25 PCM INSPECTION (except for G F4A-EL
models))
(See Section F (for GF4A-EL models))
Inspect PCM GND condition.
No
Zero or low:
• Inspect fuel pump circuit.
• Inspect for open fuel pum p relief valve. (
• Inspect for fuel leakage inside pressure
regulator.
• Inspect for clogged main fuel line.
•
Inspect pulsation damper.
High:
• Inspect pressure regulator fo r high pressure
cause.
• Inspect for clogged fuel return line.
17 • Verify test results.
— If okay, return to diagnostic index to service any additional symptoms.
— If malfunction remains, inspect related Service Information and perform repair or diagnosis.
• If vehicle is repaired, troubleshooting completed.
• If vehicle is not repaired or additional diagnostic information is not available, replace PCM.
F1-146