No.22 Vibration Concerns (Engine; No.23 A/C Does Not Work Sufficiently - Mazda 6 2002 Workshop Manual

NO.22 VIBRATION CONCERNS (ENGINE)

22 VIBRATION CONCERNS (ENGINE)
DESCRIPTION • Vibration from under hood or driveline
• Loose attaching bolts or worn parts
POSSIBLE CAUSE
• Components malfunction such as worn parts
Diagnostic procedure
STEP
1 Inspect following components for loose attaching
bolts or worn parts:
• Cooling fan
• Condenser fan
• Drive belt and pulleys
• Engine mounts
All items okay?
2 Verify test results.
• If okay, return to diagnostic inde to service any additional symptoms.
• If malfunction remains, replace PCM.
End Of Sie

NO.23 A/C DOES NOT WORK SUFFICIENTLY

23 A/C DOES NOT WORK SUFFICIENTLY.
DESCRIPTION A/C compressor magnetic clutch does not engage when A/C switch is turned on.
• Improper refrigerant charging amount
• Open A/C magnetic clutch
• Open circuit between A/C relay and A/C magnetic clutch
• Poor GND of A/C magnetic clutch
POSSIBLE CAUSE
• Refrigerant pressure switch is stuck open.
• A/C relay is stuck open.
• Seized A/C compressor
• Open circuit between A/C switch and PCM through both refrigerant pressure switch and A/C amplifier
Diagnostic procedure
STEP
1 Connect WDS or equivalent to DLC-2.
Retrieve any continuous memory, KOEO and
KOER DTCs.
Are there any DTCs displayed?
2 Disconnect A/C compressor connector.
Start engine and turn A/C switch on.
Is there correct voltage at terminal of A/C
compressor magnetic clutch connector?
Specification
More than 10.5 V
3 Disconnect refrigerant pressure switch
connector.
Connect jumper wire between terminals of A/C
high pressure switch connector.
Connect jumper wires between terminals of
refrigerant pressure switch connector.
Connect WDS or equivalent to DLC-2.
Access ACSW PID.
Turn ignition switch to ON position.
Turn A/C switch on and set blower fan at any
speed.
Does ACSW PID read ON?
4 Remove jumper wire from switch connector.
Reconnect connector to refrigerant pressure
switch.
Start engine and turn A/C switch on.
Does fan operate?
5 Verify test results.
• If okay, return to diagnostic inde to service any additional symptoms.
• If malfunction remains, replace PCM.
F–220
TROUBLESHOOTING
INSPECTION
INSPECTION
RESULTS
Yes Inspect following systems:
• Wheels
• ATX
• Driveline
• Suspension
No Readjust or retighten engine mount installation
position.
Service if necessary for other parts.
RESULTS
Yes DTC is displayed:
Go to appropriate DTC test.
No No DTC is displayed:
Go to net step.
Yes Inspect for GND condition of magnetic clutch on A/C
compressor.
If GND condition is okay, inspect for open circuit
magnetic clutch coil.
No Go to net step.
Yes Inspect refrigerant pressure switch operation.
If switch is okay, go to net step.
No Inspect for following:
• A/C switch is stuck open.
• Open circuit between refrigerant pressure switch
and PCM terminal 1AC
• Open circuit of blower motor fan switch and resistor
(if blower motor does not operate)
• Evaporator temperature sensor and A/C amplifier
Yes Inspect for stuck open A/C relay.
Replace if necessary.
No Inspect following and repair or replace as necessary:
• Refrigerant charging amount
• A/C compressor for being seized
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