Mazda 6 2002 Workshop Manual page 1158

STEP
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?
4 INSPECT BLOWER UNIT INTAKE VENT
• Is blower unit intake vent clogged?
5 VERIFY THAT MALFUNCTION SYMPTOM
OCCURS AFTER REPAIR
• Does air blow out?
End Of Sie
NO.4 AIR INTAKE MODE DOES NOT CHANGE
4 Air intake mode does not change.
DESCRIPTION • Air intake mode does not change when switching REC/FRESH mode.
POSSIBLE • Malfunction in air intake actuator (Steps 1—6)
CAUSE • Malfunction in air intake door (Step 7)
• 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
STEP
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)
(See U–47 Full-auto Air
• Are voltages okay?
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: approimately 0.5 V during
RECIRCULATE and approimately 10 V
during FRESH
— Terminal F: approimately 10 V during
RECIRCULATE and approimately 0.5 V
during FRESH
U–68
TROUBLESHOOTING
INSPECTION
INSPECTION
Conditioner)
Yes Go to net step.
No Remove obstruction, repair or replace fan and blower unit
case, then go to Step 5.
Yes Remove obstruction, then go to net step.
No Inspect if there are any obstructions in passage between
blower unit and A/C unit, then go to net step.
Yes Troubleshooting completed.
Eplain repairs to customer.
No Recheck malfunction symptoms, then repeat from Step 1 if
malfunction recurs.
Yes Go to net step.
No Go to Step 3.
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.
ACTION
A6E858001038W06
ACTION