Mazda 6 2002, Workshop Manual

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F–190
TROUBLESHOOTING
End Of Sie
6 Visually inspect CKP sensor and teeth of
crankshaft pulley.
Are CKP sensor and teeth of crankshaft pulley
okay? Yes Go to next step.
No Replace malfunctioning parts.
7 Measure gap between CKP sensor and teeth of
crankshaft pulley.
Specification
0.5—1.9 mm {0.020—0.75 in}
Is gap within specification?
Yes Go to next step.
No Adjust CKP sensor.
8 Remove and shake PCV valve.
Does PCV valve rattle? Yes Go to next step.
No Replace PCV valve.
9 Install fuel pressure gauge between fuel pipe
and fuel distributor.
Connect a 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
ON?
(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.
10 Is fuel line pressure held after ignition switch is
turned off?
(See
F–20 FUEL LINE PRESSURE
INSPECTION )
Yes Go to next step.
No Inspect fuel injector.
If fuel injector is okay, replace fuel pump unit.
11 Disconnect a vacuum hose from purge solenoid
valve and plug opening end of vacuum hose.
Attempt to start engine.
Is starting condition improved? Yes Inspect if purge solenoid valve sticks open.
No Go to next step.
12 Inspect MAF sensor for contamination.
Is there any contamination? Yes Replace MAF sensor.
No Go to next step.
13 Is there restriction in exhaust system? Yes Inspect exhaust system.
No Go to next step.
14 Inspect engine condition while tapping EGR
valve housing. Does engine condition improve? Yes Replace EGR valve.
No Go to next step.
15 Inspect starting system.
(See
G–12 STARTER INSPECTION .)
Is starting system normal?
Yes Inspect for loose connectors or poor terminal contact. If
okay, remove EGR valve and visually inspect for
mechanically stuck EGR valve.
No Repair or replace components as required.
16 Verify test results.
•
If okay, return to diagnostic index to service any additional symptoms.
•
If malfunction remains, replace PCM.
STEP INSPECTION RESULTS ACTION