Mazda 6 2002 Workshop Manual page 303

STEP
11 Install fuel pressure gauge between fuel pipe
and fuel distributor.
Connect jumper wire between F/P terminal at
DLC-2 in engine compartment and GND.
Turn ignition switch to ON position.
Is fuel line pressure correct with ignition switch
to ON position?
(See F–20 FUEL LINE PRESSURE
INSPECTION)
12 Visually inspect for fuel leakage at fuel injector
O-ring and fuel line.
Service as necessary.
Is fuel line pressure held after ignition switch is
turned off?
(See F–20 FUEL LINE PRESSURE
INSPECTION)
13 Note
• Following test is for engine stalling with A/
C on. If other symptom eists, go to net
step.
Connect a 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?
(See U–12 REFRIGERANT PRESSURE
CHECK.)
14 Note
• The following test should be performed for
symptom with cruise control ON. If other
symptoms eist, go to net step.
Inspect cruise control system.
Is cruise control system okay?
15 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?
16 Visually inspect CMP sensor and projections of
camshaft pulley.
Are CMP sensor and projections of camshaft
pulley okay?
17 Inspect VTCS operation.
(See F–231 Variable Tumble Control System
(VTCS) Operation
Is VTCS okay?
18 Inspect EGR system.
(See F–233 EGR Control System
Is EGR system okay?
19 Is engine compression correct?
20 Verify test results.
• If okay, return to diagnostic inde to service any additional symptoms.
• If malfunction remains, replace PCM.
End Of Sie
F–206
TROUBLESHOOTING
INSPECTION
Inspection.)
Inspection.)
RESULTS
Yes Go to net step.
No Zero or low:
Inspect for clogged fuel line.
If okay, replace fuel pump unit.
High:
Replace fuel pump unit.
Yes Go to net step.
No Inspect fuel injector.
If fuel injector is okay, replace fuel pump unit.
Yes Go to net step.
No If A/C is always on, go to symptom troubleshooting
"No.24 A/C is always on or A/C compressor runs
continuously".
For other symptoms, inspect following:
• Refrigerant charging amount
• Condenser fan operation
Yes Go to net step.
No Repair or replace malfunctioning parts.
Yes Go to net step.
Inspect if purge solenoid valve sticks open
mechanically.
Inspect evaporative emission control system.
No Go to net step.
Yes Go to net step.
No Replace malfunctioning parts.
Yes Go to net step.
No Replace or replace malfunctioning parts.
Yes Go to net step.
No Replace malfunctioning parts.
Yes Inspect following:
• Valve timing
• Internal transale part (ATX)
• Clutch (MTX)
No Inspect for cause.
ACTION