Mazda Training manual — part 293

AIR CONDITIONING
05 - Units and Parts Checks

SG05-2

TC070-15-01H

Blower relay

Check continuities Step 1 and 2.

Continuity Step 1: OK / NG

Continuity Step 2: OK / NG

Blower motor

Inspect by directly applying battery voltage.

Operation: OK / NG

Resistor

Measure the resistances.

A – D: ohm, Condition OK / NG

A – B: ohm, Condition OK / NG

A – C: ohm, Condition OK / NG

Air intake actuator

Check the air intake actuator for its function by directly applying the battery voltage.

C (B+) – G (Ground): Operation OK / NG

G (B+) – E (Ground): Operation OK / NG

Evaporator temperature sensor

Measure the resistance between the evaporator temperature sensor terminals.

Resistance: ohm at ºC

Resistance: ohm at ºC

A/C relay

Check continuities Step 1 and 2.

Continuity Step 1: OK / NG, Continuity Step 2: OK / NG

AIR CONDITIONING
05 - Units and Parts Checks

SG05-3

TC070-15-01H

Magnetic clutch

Connect battery positive voltage to magnetic clutch terminal A and the A/C
compressor body to ground.

Operation: OK / NG

Refrigerant pressure switch

1. Install the manifold gauge.
2. Disconnect the refrigerant pressure switch connector.
3. Verify the high-pressure side reading of the manifold gauge and continuity

between the refrigerant pressure switch terminals.

Continuity: OK / NG at psi

Fan switch

Remove the climate control unit. Verify that the continuity between the fan switch
terminals is as indicated in the table.

Continuity (switch position OFF): OK / NG

Continuity (switch position 1): OK / NG

Continuity (switch position 2): OK / NG

Continuity (switch position 3): OK / NG

Continuity (switch position 4): OK / NG

Note

Refer to the workshop manual to remove the fan switch.

AIR CONDITIONING
05 - Units and Parts Checks

SG05-4

TC070-15-01H

Climate control unit inspection

Terminal Signal

name

Connected

to

Measurement

condition

Voltage

(V)

Remark

D

B+

ROOM 15 A
fuse

Under any condition

IG SW ON

F

IG2

A/C 10 A fuse

IG SW LOCK

J

GND

Body ground

Under any condition

L

Sensor GND

Evaporator
temperature
sensor

Under any condition

A/C switch ON, fan
switch at 1st

M

A/C PJB

A/C switch OFF

N

Evaporator
temperature
sensor input

Evaporator
temperature
sensor

Compared with
temperature detected
by evaporator
temperature sensor

Rear window
defroster
switch ON

P

Rear
window
defroster
switch
indicator
light

PJB

Rear window
defroster
switch OFF

Rear window
defroster
switch ON

R

Rear
window
defroster
switch

PJB

Rear window
defroster
switch OFF

FAN signal

FAN switch ON

T

Fan switch

FAN switch OFF

Headlight switch OFF

U

TNS signal

Panel light
control
switch

Headlight switch

Headlight switch OFF

V

TNS signal

PJB

Headlight switch ON

AIR CONDITIONING
05 - Units and Parts Checks

SG05-5

TC070-15-01H

Instructor Sign-Off:
Now that you have completed this activity, you should be able to:

Perform checks for A/C components

This skill will help you evaluate protection devices for correct operation.

Instructor’s initials: