Mazda 6 2002 Workshop Manual page 1149

STEP
4 • Turn ignition switch to ON position.
• Measure voltage at terminal 1K of climate
control unit connector (24-pin).
• Is voltage approimately 5 V?
End Of Sie
DTC 14
DTC 14 Water temperature sensor system inspection
• Water temperature sensor malfunction
POSSIBLE
• Climate control unit malfunction
CAUSE
• Open or short circuit between water temperature sensor and climate control unit
Diagnostic Procedure
STEP
1 • Is resistance between terminals 1I and 1O of
climate control unit connector (24-pin) as
indicated below?
• 112 ohms—110 kilohms
2 • Inspect water temperature sensor.
• Is it okay?
End Of Sie
DTC 15
DTC 15 Water temperature sensor system inspection
• Water temperature sensor malfunction
POSSIBLE
• Climate control unit malfunction
CAUSE
• Open or short circuit between water temperature sensor and climate control unit
Diagnostic Procedure
STEP
1 • Is water temperature sensor normal?
2 • Disconnect climate control unit connector
(24-pin) and water temperature sensor
connector.
• Is there open circuit between following
terminals of climate control unit connector
(24-pin) and water temperature sensor
connector?
— 1O—A
— 1I—B
3 • Is there short circuit to ground between
terminal 1O of climate control unit connector
(24-pin) and terminal A of water temperature
sensor connector?
4 • Turn the ignition switch to ON position.
• Is voltage at terminal 1O of climate control
unit connector (24-pin) above 5 V?
End Of Sie
DTC 18
DTC 18 Air mi actuator (potentiometer) system inspection
• Air mi actuator malfunction
POSSIBLE • Climate control unit malfunction
CAUSE • Open circuit between air mi actuator and climate control unit
• Short circuit between air mi actuator (terminal C) and climate control unit (terminal 1U: 24-pin)
Diagnostic Procedure
STEP
1 • Inspect air mi actuator.
• Is it okay?
ON-BOARD DIAGNOSTIC
INSPECTION
INSPECTION
INSPECTION
INSPECTION
Yes This system is normal at present. (Erase the past failure
from memory.)
No Replace climate control unit.
Yes Replace climate control unit.
No Go to net step.
Yes Repair wiring harness.
No Replace water temperature sensor.
Yes Go to net step.
No Replace water temperature sensor.
Yes Repair wiring harness.
No Go to net step.
Yes Repair wiring harness.
No Connect climate control unit connector and go to net step.
Yes This system is normal at present. (Erase the past failure
from memory.)
No Replace climate control unit.
Yes Go to net step.
No Replace air mi actuator.
ACTION
A6E857001038W09
ACTION
A6E857001038W10
ACTION
A6E857001038W11
ACTION
U–59
U