Mazda 2002 6 Workshop Manual page 330

STEP
2 Connect WDS or equivalent to DLC-2.
Retrieve any continuous memory, KOEO and
KOER.
Are there any DTCs displayed?
3 Is engine overheating?
4 Note
• Following test is for engine running rough
idle with A/C on concerns. If other
symptoms exist, go to next step.
Connect pressure gauge to A/C low and high
pressure side lines.
Start engine and run it at idle.
Turn A/C switch on.
Measure low side and high side pressures.
Are pressures within specifications?
(See U–12 REFRIGERANT PRESSURE
CHECK.)
5 Note
• Following test is for engine running rough
with P/S on. If other symptoms exist, go to
next step.
Start engine and run it at idle.
Access PSP PID.
Inspect if PSP PID is on while turning steering
wheel right to left.
Is PSP PID okay?
6 Visually inspect CKP sensor and teeth of
crankshaft pulley.
Are CKP sensor and teeth of crankshaft pulley
okay?
7 Measure gap between CKP sensor and teeth of
crankshaft pulley.
Specification
0.5—1.5 mm {0.020—0.075 in}
Is gap within specification?
8 Inspect for cracks on high-tension leads.
Are there any cracks on high-tension leads?
9 Inspect spark plug condition.
Is spark plug wet, covered with carbon or
grayish white?
10 Start engine and disconnect IAC valve
connector.
Does rpm drop or engine stall?
11 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)
12 Visually inspect for fuel leakage at fuel injector,
O-ring, and fuel line.
Service as necessary.
Does fuel line pressure hold after ignition switch
is turned off?
(See F–20 FUEL LINE PRESSURE
INSPECTION)
F–200
TROUBLESHOOTING
INSPECTION RESULTS
Yes DTC is displayed:
Go to appropriate DTC test.
No No DTC is displayed:
Go to next step.
Yes Go to symptom troubleshooting "No.17 Cooling system
concerns - Overheating".
No Go to next step.
Yes Go to next 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 Inspect power steering pressure switch operation and
wiring harness between P/S pressure switch connector
and PCM connector terminal 1Z.
No Go to next step.
Yes Go to next step.
No Replace malfunctioning parts.
Yes Go to next step.
No Adjust CKP sensor.
Yes Repair suspected high-tension leads.
No Go to next step.
Yes Spark plug is wet or covered with carbon:
Inspect for fuel leakage from injector.
Spark plug is grayish white:
Inspect for clogged fuel injector.
No Install spark plugs on original cylinders.
Go to next step.
Yes Go to next step.
No Inspect IAC valve and wiring harness.
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 Inspect fuel injector.
If fuel injector is okay, replace fuel pump unit.
ACTION