Mazda 2002 6 Workshop Manual page 342

STEP
4 Is strong blue spark visible at each disconnected
high-tension lead while cranking engine?
5 Install fuel pressure gauge between fuel pipe
and fuel distributor.
Start engine and run it at idle.
Measure fuel line pressure at idle.
Is fuel line pressure correct at idle?
(See F–20 FUEL LINE PRESSURE
INSPECTION)
6 Inspect for VTCS operation.
(See F–231 Variable Tumble Control System
(VTCS) Operation
Does VTCS work properly?
7 Note
• The following test should be performed for
vehicles with variable valve timing control
system. Go to next step for vehicles
without variable valve timing control
system.
Inspect for variable valve timing control system
operation.
(See F–239 Variable Valve Timing Control
System Operation
Does variable valve timing control system work
properly?
8 Note
• The following test should be performed for
vehicles with VIS. Go to next step for
vehicles without VIS.
Inspect for VIS operation.
(See F–230 VIS Operation
Does VIS work properly?
9 Remove and shake PCV valve.
Does PCV valve rattle?
10 Inspect for restriction in the exhaust system.
Is there any restriction?
11 Inspect for contaminated MAF sensor.
Is there any contamination?
12 Inspect MAF sensor for contamination.
Is there any contamination?
13 Is engine compression correct?
14 Verify test results.
• If okay, return to diagnostic index to service any additional symptoms.
• If malfunction remains, replace PCM.
End Of Sie
F–212
TROUBLESHOOTING
INSPECTION
Inspection.)
Inspection.)
Inspection.)
RESULTS
Yes Inspect for following:
• Spark plugs malfunction
• CMP sensor is improperly installed.
• Trigger wheel damage on camshaft
• Open or short circuit on CMP sensor
• Open or short circuit between CMP sensor and
PCM terminal 2J or 2M
Repair or replace malfunctioning parts.
If okay, go to next step.
No Inspect following:
• High-tension leads
• Ignition coil and connector
Yes Go to next step.
No Zero or low:
Inspect for clogged fuel line.
If okay, replace fuel pump unit
High:
Replace fuel pump unit.
Yes Go to next step.
No Repair or replace malfunctioning parts.
Yes Go to next step.
No Repair or replace malfunctioning parts.
Yes Go to next step.
No Repair or replace malfunctioning parts.
Yes Go to next step.
No Replace PCV valve.
Yes Inspect exhaust system.
No Go to next step.
Yes Go to next step.
No Inspect for cause.
Yes Replace MAF sensor.
No Go to next step.
Yes Inspect valve timing.
No Inspect for cause.
ACTION