Mazda MX-6 1998, Workshop Manual

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TROUBLESHOOTING [ENGINE CONTROL KL]
STEP INSPECTION
ACTION
6 Install fuel pressure gauge between fuel filter
and fuel distributor.
Start engine and run it at idle.
Measure fuel line pressure at idle.
Is fuel line pressure correct at idle?
Fuel line pressure
210— 260 kPa
{2.1— 2.6 kgf/cm2, 30— 37 psi}
Yes Go to next step.
No
Zero or low:
Check fuel pump circuit.
Check for open fuel pump relief valve.
Check for fuel leak inside pressure regulator.
Check for clogged main fuel line.
High:
Check pressure regulator for high pressure cause.
Check for clogged fuel return line.
7 Does fuel line pressure remain at specification
for 60 seconds when ignition switch is turned
ON?
Fuel line pressure
210— 260 kPa
{2.1— 2.6 kgf/cm2, 30—37 psi}
Yes Go to next step.
No
Check pressure regulator for high pressure cause.
8
Is strong blue spark visible at each
disconnected high-tension lead while cranking
engine?
Yes Check spark plug(s) and CMP sensor.
No Check following:
• High-tension leads.
• Ignition coil and connector.
9
Verify test results. If okay, return to diagnostic index to service any additional symptoms.
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