Mazda 6 2002, Workshop Manual

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F–212
TROUBLESHOOTING
End Of Sie
4 Is strong blue spark visible at each disconnected
high-tension lead while cranking engine? 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
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 )
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.
6 Inspect for VTCS operation.
(See
F–231 Variable Tumble Control System
(VTCS) Operation Inspection .)
Does VTCS work properly?
Yes Go to next step.
No Repair or replace malfunctioning parts.
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 Inspection .)
Does variable valve timing control system work
properly?
Yes Go to next step.
No Repair or replace malfunctioning parts.
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 Inspection .)
Does VIS work properly?
Yes Go to next step.
No Repair or replace malfunctioning parts.
9 Remove and shake PCV valve.
Does PCV valve rattle? Yes Go to next step.
No Replace PCV valve.
10 Inspect for restriction in the exhaust system.
Is there any restriction? Yes Inspect exhaust system.
No Go to next step.
11 Inspect for contaminated MAF sensor.
Is there any contamination? Yes Go to next step.
No Inspect for cause.
12 Inspect MAF sensor for contamination.
Is there any contamination? Yes Replace MAF sensor.
No Go to next step.
13 Is engine compression correct? Yes Inspect valve timing.
No Inspect for cause.
14 Verify test results.
•
If okay, return to diagnostic index to service any additional symptoms.
•
If malfunction remains, replace PCM.
STEP INSPECTION RESULTS ACTION