Mazda 6 2002, Workshop Manual

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F–208
TROUBLESHOOTING
2 Connect WDS or equivalent to DLC-2.
Retrieve any continuous memory, KOEO and
KOER DTCs.
If engine stall condition exists, retrieve
continuous memory and KOEO DTCs.
Are there any DTCs displayed? Yes DTC is displayed:
Go to appropriate DTC test.
No No DTC is displayed:
Go to next step.
3 Is engine overheating? Yes Go to symptom troubleshooting "No.17 Cooling system
concerns - Overheating".
No Go to next step.
4 Connect WDS or equivalent to DLC-2.
Access RPM, MAF, TP and VSS PIDs.
Drive vehicle while monitoring PIDs.
Are PIDs within specifications?
(See
F–45 PCM INSPECTION .)
Yes Go to next step.
No RPM PID:
Inspect CKP sensor and related wiring harness for
vibration and/or intermittent open/short circuit.
MAF PID:
Inspect for intermittent open circuit of MAF sensor and
related wiring harness.
TP PID:
Inspect if TP sensor output increases smoothly.
VSS PID:
Inspect for intermittent open circuit of VSS and related
wiring harness.
5 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.
6 Measure gap between CKP sensor and teeth of
crankshaft pulley.
Specification
0.5—1.9 mm {0.020—0.075 in}
Is gap within specification?
Yes Go to next step.
No Adjust CKP sensor.
7 Inspect spark plug condition.
Is spark plug wet, covered with carbon or
grayish white? Yes Spark plug is wet or covered with carbon:
Inspect for fuel leakage from fuel injector.
Spark plug is grayish white:
Inspect for clogged fuel injector.
No Install spark plugs on original cylinders.
Go to next step.
8 Remove and shake PCV valve.
Does PCV valve rattle? Yes Go to next step.
No Replace PCV valve.
9 Inspect for restriction in exhaust system.
Is there any restriction? Yes Inspect exhaust system.
No Go to next step.
10 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 )
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.
11 Inspect 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.
12 Note
•
The following test should be performed for
vehicles with VIS. Go to next step for
vehicles without VIS.
Inspect VIS operation.
(See
F–230 VIS Operation Inspection .)
Does VIS work properly?
Yes Go to next step.
No Repair or replace malfunctioning parts.
STEP INSPECTION RESULTS ACTION