Mazda 6 Workshop Manual page 229

STEP INSPECTION
12 Is the engine compression correct?
13 Inspect the fuel injector.
Is the fuel injector normal?
14 Note
• The following test should be performed on
the vehicles with A/C system. If the
following test cannot be performed due to
the engine stall, go to the next step.
• Go to the next step for the vehicle without
A/C system.
Connect the pressure gauge to the A/C line.
Turn the blower and the A/C switches on.
Is the pressure within the specifications?
15 Inspect the EGR system operation.
(See F2–232 EGR Control System
Is the EGR system operation normal?
16 Inspect the glow system operation.
Is the glow system operation normal?
17 Inspect the IDM.
Is the IDM normal?
18 Verify the test results.
• If normal, return to the diagnostic index to service any additional symptoms.
• If the malfunction remains, replace the PCM.
End Of Sie
NO.11 ENGINE STALLS/QUITS, ENGINE RUNS ROUGH, MISSES, BUCK/LERK, HESITATION/STUMBLE
ENGINE STALLS/QUITS, ENGINE RUNS ROUGH, MISSES, BUCK/JERK, HESITATION/STUMBLE,
11
SURGES
• The engine stops unexpectedly at the beginning of acceleration or during cruising.
• The engine stops unexpectedly while cruising.
• The engine speed fluctuates during acceleration or cruising.
• The engine misses during acceleration or cruising.
DESCRIPTION
• The vehicle bucks/jerks during acceleration or deceleration.
• Momentary pause at the beginning of acceleration or during acceleration.
• Momentary minor irregularity in the engine output.
TROUBLESHOOTING
RESULTS
Yes Go to the next step.
No Inspect for the 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 if necessary.
Yes Go to the next step.
No Repair or replace if necessary.
Yes Go to the next step.
No A/C is always on:
Go to the symptom troubleshooting "NO.24 A/C
ALWAYS ON OR A/C COMPRESSOR RUNS
CONTINUOUSLY".
Other symptoms:
Inspect the following:
• Refrigerant charging amount
• Cooling fan No.1 and/or cooling fan No.2 operation
Yes Go to the next step.
Inspection.)
No Repair or replace the malfunctioning part according to
the EGR control system inspection results.
Yes Go to the next step.
No Service if necessary.
Yes Remove and inspect the supply pump and the
common rail.
No Repair or replace if necessary.
ACTION
B6E408018881106
F2–217
F2