Mazda MX-6 1998, Workshop Manual, Page: 906 / 1282

TROUBLESHOOTING
STEP
INSPECTION ACTION
Start engine.
Turn both A/C switch and fan switch on.
Does A/C compressor operate?
Yes Go to next step if A/C switch indicator light does not
illuminate. If indicator light works, go to symptom
troubleshooting No. 5.
No Go to next step.
Does A/C switch indicator light illuminate?
Yes Go to step 5.
No Go to next step.
4* Turn fan switch to off.
Measure voltage at terminal 1E (A/C signal) of
heater control unit 14-pin connector.
Is voltage okay?
Yes Replace heater control unit, then go to step 25.
No Repair wiring harness between heater control unit and fan
switch, then go to step 25.
W 6 U 7 0 1 W A C
Perform refrigerant system performance test,
o - 0 7 -1 0 REFRIGERANT SYSTEM
PERFORMANCE TEST
Is operation normal?
Yes Reconfirm malfunction symptoms.
No Go to next step.
Inspect drive belt.
ter 0 1 -1 0 DRIVE BELT INSPECTION
Is it okay?
Yes
Verify cooling fan and condenser fan operation.
If fans are inoperative, inspect fan relays, condenser fan
and/or cooling fan, and related harnesses.
If operation is okay, go to next step.
No
Adjust or replace drive belt, then go to step 25.
t-s 0 1 -1 0 DRIVE BELT ADJUSTMENT
7*
Disconnect heater control unit 14-pin
connector.
Start engine.
Turn both A/C switch and fan switch on.
Measure voltage at terminal 1F (A/C signal) of
heater control unit 14-pin connector of wiring
harness.
Is voltage okay?
Yes
Connect heater control unit connector, then go to step 15.
No Go to next step.
1 0 1 M
1 K
X -
1 E 1 C
1 A
*
1N
1L 1J 1H IF
10 1B
W 6 U 7 0 1 W A D
0 7 -0 1 -7