Mazda 6. Manual — part 391
U–68
TROUBLESHOOTING
End Of Sie
NO.4 AIR INTAKE MODE DOES NOT CHANGE
A6E858001038W06
• When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while
performing the inspection to discover whether poor contact points are the cause of any intermittent
malfunctions. If there is a problem, check to make sure connectors, terminals and wiring harnesses are
connected correctly and undamaged.
Diagnostic procedure
3
INSPECT BLOWER UNIT
• Inspect fan in blower unit.
— Is fan free of interference from blower unit
case?
— Is fan free of foreign material and
obstructions?
• Is fan okay?
Yes
Go to next step.
No
Remove obstruction, repair or replace fan and blower unit
case, then go to Step 5.
4
INSPECT BLOWER UNIT INTAKE VENT
• Is blower unit intake vent clogged?
Yes
Remove obstruction, then go to next step.
No
Inspect if there are any obstructions in passage between
blower unit and A/C unit, then go to next step.
5
VERIFY THAT MALFUNCTION SYMPTOM
OCCURS AFTER REPAIR
• Does air blow out?
Yes
Troubleshooting completed.
Explain repairs to customer.
No
Recheck malfunction symptoms, then repeat from Step 1 if
malfunction recurs.
STEP
INSPECTION
ACTION
4
Air intake mode does not change.
DESCRIPTION
• Air intake mode does not change when switching REC/FRESH mode.
POSSIBLE
CAUSE
• Malfunction in air intake actuator (Steps 1—6)
• Malfunction in air intake door (Step 7)
STEP
INSPECTION
ACTION
1*
INSPECT TO SEE WHETHER MALFUNCTION
(LACK OF CONTINUITY) IS IN AIR INTAKE
ACTUATOR, WIRING HARNESS (BETWEEN
CLIMATE CONTROL UNIT AND AIR INTAKE
ACTUATOR) OR ELSEWHERE
• Turn ignition switch to ON position.
• Test voltages at the following terminals of
climate control unit.
— Terminal 2K (12-pin, FRESH motor drive
signal)
— Terminal 2I (12-pin, RECIRCULATE
motor drive signal)
U–47 Full-auto Air Conditioner
• Are voltages okay?
Yes
Go to next step.
No
Go to Step 3.
2*
INSPECT TO SEE WHETHER MALFUNCTION
(LACK OF CONTINUITY) IS IN AIR INTAKE
ACTUATOR OR WIRING HARNESS
(BETWEEN CLIMATE CONTROL UNIT AND
AIR INTAKE ACTUATOR)
• Test voltages at the following terminals of air
intake actuator.
— Terminal D (FRESH motor drive signal)
— Terminal F (RECIRCULATE motor drive
signal)
• Are voltages as shown below?
— Terminal D: approximately 0.5 V during
RECIRCULATE and approximately 10 V
during FRESH
— Terminal F: approximately 10 V during
RECIRCULATE and approximately 0.5 V
during FRESH
Yes
Replace air intake actuator, then go to Step 8.
No
Repair wiring harness between climate control unit and air
intake actuator, then go to Step 8.
TROUBLESHOOTING
U–69
U
End Of Sie
3
INSPECT TO SEE WHETHER MALFUNCTION
IS IN AIR INTAKE ACTUATOR OR
ELSEWHERE
• Disconnect air intake actuator connector.
• Test voltages at the following terminals of
climate control unit.
— Terminal 2K (12-pin, FRESH motor drive
signal)
— Terminal 2I (12-pin, RECIRCULATE
motor drive signal)
U–47 Full-auto Air Conditioner
)
• Are voltages okay?
Yes
Inspect air intake actuator, then go to Step 8.
No
Go to next step.
4
INSPECT TO SEE WHETHER MALFUNCTION
IS IN WIRING HARNESS (SHORT TO B+
BETWEEN CLIMATE CONTROL UNIT AND
AIR INTAKE ACTUATOR) OR ELSEWHERE
• Disconnect climate control unit connector.
• Test voltages at the following terminals of
climate control unit.
— Terminal 2K (12-pin, FRESH motor drive
signal)
— Terminal 2I (12-pin, RECIRCULATE
motor drive signal)
• Are voltages approximately 0 V?
Yes
Go to next step.
No
Repair wiring harness between climate control unit and air
intake actuator, then go to Step 8.
5
INSPECT TO SEE WHETHER MALFUNCTION
IS IN WIRING HARNESS (SHORT TO
GROUND BETWEEN CLIMATE CONTROL
UNIT AND AIR INTAKE ACTUATOR) OR
ELSEWHERE
• Turn ignition switch to LOCK position.
• Inspect for continuity at the following
terminals between climate control unit and
ground.
— Terminal 2K (12-pin, FRESH motor drive
signal)
— Terminal 2I (12-pin, RECIRCULATE
motor drive signal)
• Is there continuity?
Yes
Repair wiring harness between climate control unit and air
intake actuator, then go to Step 8.
No
Go to next step.
6
INSPECT AIR INTAKE LINK
• Inspect air intake links.
— Is there grease on link?
— Are links securely and properly installed?
— Are links free of obstructions and
hindrances?
• Are above items okay?
Yes
Go to next step.
No
Apply grease to links. If any links are damaged, replace air
intake actuator, then go to Step 8.
7
INSPECT TO SEE WHETHER MALFUNCTION
IS IN CLIMATE CONTROL UNIT OR AIR
INTAKE DOOR
• Inspect blower unit air intake door.
— Is door free of obstructions, cracks, and
damage?
— Are doors securely and properly installed?
• Are above items okay?
Yes
Replace climate control unit, then go to next step.
No
Remove obstruction, or install doors in proper position. If
any doors are cracked or damaged, replace them, then go
to next step.
8
CONFIRM THAT MALFUNCTION SYMPTOMS
DO NOT RECUR AFTER REPAIR
• Does air intake mode change smoothly?
Yes
Troubleshooting completed. Explain repairs to customer.
No
Recheck malfunction symptoms, then repeat from Step 1 if
malfunction recurs.
STEP
INSPECTION
ACTION
U–70
TROUBLESHOOTING
NO.5 NO TEMPERATURE CONTROL WITH CLIMATE CONTROL UNIT
A6E858001038W07
Diagnostic procedure
End Of Sie
NO.6 WINDSHIELD FOGGED
A6E858001038W08
• When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while
doing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If
there is a problem, check to make sure connectors, terminals and wiring harness are connected correctly and
undamaged.
5
No temperature control with climate control unit.
DESCRIPTION
• Malfunction in A/C unit and/or climate control unit air mix system.
POSSIBLE
CAUSE
• A/C unit air mix link, air mix crank, air mix rod, air mix wire, wire clamp malfunction (Steps 2, 3)
• Climate control unit rack-and-pinion, air mix wire malfunction (Step 4)
• A/C unit air mix door malfunction (Steps 5, 6)
• Heater piping malfunction (Step 7)
STEP
INSPECTION
ACTION
1
INSPECT COOLANT TEMPERATURE
• Is coolant sufficiently warmed up?
Yes
Go to next step.
No
Warm engine up, then go to Step 8.
2
INSPECT A/C UNIT AIR MIX SYSTEM
• Inspect A/C unit air mix links, air mix cranks,
air mix rods, air mix actuator or wire clamp.
— Is there grease on links and cranks?
— Are links, cranks, and rods securely
installed in their proper positions?
— Is wire clamp free of deformation?
• Are above items okay?
Yes
Go to next step.
No
Apply grease or install links, cranks, and rods securely in
their proper positions, repair or replace air mix actuator or
wire clamp, then go to Step 8.
3
VERIFY THAT AIR MIX WIRE FROM A/C UNIT
IS POSITIONED SECURELY AND
CORRECTLY (IF AVAILABLE)
• Is air mix wire securely installed in the
correct position in relation to A/C unit air mix
links?
Yes
Go to next step.
No
Adjust air mix wire or install securely in correct position, then
go to Step 8.
4
INSPECT CLIMATE CONTROL UNIT
• Inspect climate control unit. (See
CLIMATE CONTROL UNIT INSPECTION
• Is climate control unit okay?
Yes
Go to next step.
No
Repair or replace climate control unit, then go to Step 8.
5
INSPECT A/C UNIT
• Is there any foreign material or obstruction in
A/C unit air mix doors?
Yes
Remove obstruction, then go to Step 8.
No
Go to next step.
6
INSPECT A/C UNIT AIR MIX DOORS
• Is A/C unit air mix door securely and properly
installed?
Yes
Inspect air mix door for cracks or damage, then go to next
step.
No
Install air mix door securely in proper position, then go to
next step.
7
INSPECT HEATER LINES
• Inspect heater lines.
— Is heater piping free of damage and
cracks?
— Are heater piping connections free of
engine coolant leakage?
— Are heater piping connections securely
tightened?
— Are heater piping installation points on A/
C unit free of engine coolant leakage?
• Are above items okay?
Yes
Operation is okay. Recheck malfunction symptoms.
No
If heater piping connections is loosed, tighten connections
with specified torque.
Repair or replace heater piping, then go to next step.
8
VERIFY THAT MALFUNCTION SYMPTOM
OCCURS AFTER REPAIR
• Does unit operate in every temperature
setting?
Yes
Troubleshooting completed.
Explain repairs to customer.
No
Recheck malfunction symptoms, then repeat from Step 1 if
malfunction recurs.
6
Windshield fogged.
DESCRIPTION
• A/C compressor does not operate while airflow mode is in DEFROSTER or HEAT/DEF modes.
• Air intake mode does not change to FRESH while airflow mode is in DEFROSTER or HEAT/DEF
modes.
TROUBLESHOOTING
U–71
U
Diagnostic procedure
POSSIBLE
CAUSE
• Climate control unit (B+ signal) system malfunction (Steps 2, 4, 5)
• Air intake actuator malfunction (Steps 3, 7)
• Climate control unit (RECIRCULATE, FRESH signal) system malfunction (Steps 9—11)
• Malfunction in blower unit air intake doors (Steps 12, 13)
STEP
INSPECTION
ACTION
1
COOL AIR BLOW OUT INSPECTION
• When both A/C and fan switch in climate
control unit are on, does cool air blow out
from front vent?
Yes
Go to next step.
No
Go to Step 1 of troubleshooting index No.8.
2
INSPECT CLIMATE CONTROL UNIT POWER
SUPPLY FUSE FOR B+ SIGNAL
• Is climate control unit power supply fuse for
B+ signal okay?
Yes
Go to next step.
No
Inspect for a short to ground on blown fuse circuit.
• Repair or replace as necessary. Install appropriate
amperage fuse.
3
INSPECT AIR INTAKE ACTUATOR
• Inspect air intake actuator.
— Is there grease on link?
— Is link securely and properly positioned?
— Is link free of obstructions?
• Are above items okay?
Yes
Go to next step.
No
Apply grease or install link properly and securely, remove
obstruction, then go to Step 14.
*4
INSPECT WIRING HARNESS BETWEEN
FUSE BLOCK AND CLIMATE CONTROL UNIT
FOR CONTINUITY
• Disconnect climate control unit connector
(12-pin).
• Turn ignition switch to ON position.
• Test voltage at climate control unit connector
terminal F (B+ signal).
• Is voltage approximately 12 V?
Yes
Go to next step.
No
Repair wiring harness between fuse block and climate
control unit, then go to Step 14.
*5
INSPECT WIRING HARNESS BETWEEN
CLIMATE CONTROL UNIT AND GROUND
FOR VOLTAGE
• Test voltage at climate control unit connector
terminal 2L (Ground).
• Is voltage approximately 0V?
Yes
Go to next step.
No
Repair wiring harness between climate control unit and
ground, then go to Step 14.
6
VERIFY WHETHER MALFUNCTION IS IN
BLOWER UNIT AIR INTAKE DOOR OR
ELSEWHERE
• Turn ignition switch to LOCK position.
• Connect climate control unit connector (12-
pin).
• Remove air intake actuator.
• Turn ignition switch to ON position.
• Set fan switch to 4th position.
• Does air intake mode (RECIRCULATE,
FRESH) change smoothly when air intake
link is operated by hand?
Yes
Go to next step.
No
Go to Step 12.
7
INSPECT AIR INTAKE ACTUATOR
• Inspect air intake actuator.
(See
• Is it okay?
Yes
Go to next step.
No
Replace air intake actuator, go to Step 14.
8
INSPECT AIR INTAKE SELECTOR SWITCH
AND DEFROSTER SWITCH IN CLIMATE
CONTROL UNIT
• Test voltage at climate control unit connector
(12-pin) terminals 2K and 2I.
• Is it okay?
Yes
Go to next step.
No
Replace climate control unit, then go to Step 14.
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