Mazda 2002 6 - No.4 Air Intake Mode Does Not Change

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)
(See 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.