Mazda MX-6 1998, Workshop Manual

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TROUBLESHOOTING [ENGINE CONTROL KL]
STEP INSPECTION
ACTION
13 Visually check for fuel leakage at fuel injector
O-ring, pressure regulator, and fuel line.
Service as necessary.
Does fuel line pressure hold after ignition
switch is turned off?
Fuel line pressure
More than 150 kPa
{1.5 kgf/cm2, 21 psi} for 5 minutes
Yes Go to next step.
No Check pressure regulator diaphragm condition.
If condition is okay, check fuel injector.
If condition is not okay, replace pressure regulator.
14 Note
• Following test is for engine stalling with A/C
on concern. If other symptom exists, go to
next step.
Yes Go to next step.
Connect pressure gauge to A/C low and high
pressure side lines.
Turn A/C on and measure low side and high
side pressure.
Are pressure within specifications?
d
- 0 7 -1 0 REFRIGERANT PRESSURE
CHECK
No
Check follows:
• Refrigerant charging amount.
• A/C pressure switches.
• Condenser fan operation.
• A/C relay.
15 Note
• Following test is performed for symptom
with cruise control ON. If other symptoms
exist, go to next step.
Check cruise control system.
Is cruise control system okay?
Yes Go to next step.
No Repair or replace.
16 Disconnect vacuum hose between purge
solenoid valve and intake manifold from purge
solenoid valve side.
Plug opening end of vacuum hose.
Drive vehicle.
Does engine condition improve?
Yes
Check if purge solenoid valve sticks to open mechanically.
Check evaporative emission control system.
No Go to next step.
17 Verify VRIS operation. Yes Go to next step.
Is VRIS operation okay?
No Check follows:
• Wrong connection of VRIS connectors.
• Wrong routing of vacuum hoses.
• Vacuum leaks from vacuum hoses.
• VRIS actuator No.1 or No.2 stuck to open or close.
18 Visually inspect camshaft position (CMP)
sensor and tooth of camshaft.
Is CMP sensor and tooth of camshaft okay?
Yes Go to next step.
No Replace malfunctioning part.
19 Is engine compression correct?
w 01-10B COMPRESSION INSPECTION
[KL]
Yes Check following:
• Valve timing.
• Intermal transaxle (ATX only).
• Clutch (MTX only).
No Check for cause.
20 Verify test results. If okay, return to diagnostic index to service any additional symptoms.
01-01B -150