Mazda 626 Station Wagon, Workshop Manual

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TROUBLESHOOTING
STEP INSPECTION ACTION
16 VERIFY THAT HEATER UNIT AIR FLOW MODE
DOORS DO NOT HAVE FOREIGN MATERIAL
OR OBSTRUCTIONS
• Is there any foreign material or obstructions in
any of the heater unit doors?
Yes Remove material/obstruction, then go to Step 18.
No Go to next step.
17 INSPECT HEATER UNIT AIRFLOW MODE
DOORS
• Are all doors within heater unit securely and
properly positioned?
• Inspect heater unit doors.
— Are doors cracked or damaged?
— Are doors securely and properly installed?
• Are they okay?
Yes
Replace climate control unit, then go to next step.
(Malfunction in climate control unit airflow mode
selector switch circuit)
No Replace or install door(s) in their proper
position (s), then go to next step.
18
CONFIRM THAT MALFUNCTION SYMPTOMS
DO NOT RECUR AFTER REPAIR
• Does airflow mode change when operating
airflow mode selector switch?
Yes Troubleshooting completed. Explain repairs to
customer.
No Recheck malfunction symptoms, then repeat from
Step 1 if malfunction recurs.
NO. 7 AIR INTAKE MODE DOES NOT CHANGE
7 Air intake mode does not change.
DESCRIPTION • Air intake mode does not change when operating REC/FRESH mode.
• Air intake mode does not change when climate control unit is in DEFROSTER mode.
POSSIBLE
CAUSE
• Climate control unit (motor drive signal) system malfunction (Steps 2-4)
• Malfunction in air intake actuator system (Steps 5, 6)
• Malfunction in blower unit air intake door (Steps 7, 8)
Diagnostic procedure
• 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.
STEP
INSPECTION ACTION
*1 CHECK TO SEE WHETHER MALFUNCTION IS
IN AIR INTAKE ACTUATOR MOTOR DRIVE
SIGNAL CIRCUIT OR ELSEWHERE
• Turn ignition switch to ON position.
• Test voltage at the following climate control unit
connector (16-pin) terminals:
• Terminal 2B (motor drive signal)
• Terminal 2M (motor drive signal)
• Is voltage as shown below?
— Terminal 2B: approximately 0 V during
RECIRCULATE and approximately 12 V
during FRESH
— Terminal 2M: approximately 12 V during
RECIRCULATE and approximately 0 V
during FRESH
Yes
Go to Step 6.
No Go to next step.
*2 INSPECT WIRING HARNESS BETWEEN
CLIMATE CONTROL UNIT AND AIR INTAKE
ACTUATOR FOR CONTINUITY
• Turn ignition switch to LOCK position.
• Disconnect climate control unit connector
(16-pin) and air intake actuator connector.
• Is there continuity between following climate
control unit connector (16-pin) terminals and
air intake actuator connector terminals?
— Terminal 2B and Terminal B
— Terminal 2M and Terminal A
Yes Go to next step.
No Repair wiring harness between climate control
unit and air intake actuator, then go to Step 9.
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