Mazda Mazda6 - Page 332

F2–180
TROUBLESHOOTING
15 Is there any restriction in exhaust system or
catalyst converter?
Yes Repair or replace as necessary.
No Go to next step.
16 Access RPM PID.
Is RPM PID indicating engine speed during
cranking engine?
Yes Go to next step.
No Go to Step 19.
17 Note
• The following test should be performed on
the vehicles with A/C system. If the
following test cannot be performed due to
engine stalling, go to next step.
• Go to next step for the vehicle without A/C
system.
Connect pressure gauge to A/C line.
Turn blower and A/C switches on.
Is pressure within specifications?
Yes Go to next step.
No A/C is always on:
Go to symptom troubleshooting “NO.24 A/C ALWAYS
ON OR A/C COMPRESSOR RUNS
CONTINUOUSLY”.
Other symptoms:
Inspect following:
• Refrigerant charging amount
• Cooling fan No.1 and/or cooling fan No.2 operation
18 Inspect adjustment of accelerator position
sensor and idle switch.
(See F2–72 ACCELERATOR POSITION
SENSOR INSPECTION)
(See F2–70 IDLE SWITCH INSPECTION)
Are accelerator position sensor and idle switch
adjusted correctly?
Yes Go to next step.
No Adjust accelerator position sensor and idle switch
correctly.
(See F2–73 ACCELERATOR POSITION SENSOR
ADJUSTMENT)
(See F2–71 IDLE SWITCH ADJUSTMENT)
19 Depress accelerator pedal slightly.
Crank engine.
Does engine start now?
Yes Inspect idle speed.
(See F2–34 IDLE SPEED INSPECTION)
No Go to next step.
20 Inspect for fuel leakage from fuel pipe.
Is any fuel leakage found on fuel pipe?
Yes Repair or replace as necessary.
No Go to next step.
21 Visually inspect CKP sensor and teeth of pulse
wheel.
Are CKP sensor and teeth of pulse wheel okay?
Yes Go to next step.
No Replace malfunctioning parts.
22 Measure gap between CKP sensor and teeth of
pulse wheel.
Specification
1.5—2.5 mm {0.059—0.098 in}
Is gap within specification?
Yes Go to next step.
No Adjust CKP sensor position.
23 Visually inspect CMP sensor and teeth of pulse
wheel.
Are CMP sensor and teeth of pulse wheel okay?
Yes Inspect following PIDs:
(See F2–65 PCM INSPECTION)
• ECT
• IAT
• MAF
• RPM
If PID value is not as specified, repair or replace
malfunctioning parts.
If PID value is okay, go to next step.
No Replace malfunctioning parts.
24 Inspect fuel pressure sensor.
(See F2–79 FUEL PRESSURE SENSOR
INSPECTION)
Is fuel pressure okay?
Yes Go to next step.
No Replace common rail.
25 Inspect suction control valve.
(See F2–54 SUCTION CONTROL VALVE
INSPECTION)
Is suction control valve okay?
Yes Go to next step.
No Repair supply pump.
(See F2–54 SUPPLY PUMP INSPECTION)
26 Is engine compression correct?
(See B2–8 COMPRESSION INSPECTION)
Yes Go to next step.
No Inspect for following:
• Damaged valve seat
• Worn valve stem and valve guide
• Worn or stuck piston ring
• Worn piston, piston ring or cylinder
• Improper valve timing
Service as necessary.
27 Inspect fuel injector.
(See F2–56 FUEL INJECTOR INSPECTION)
Is fuel injector okay?
Yes Go to next step.
No Repair or replace as necessary.
STEP INSPECTION RESULTS ACTION