Mazda MX-6 1998, Workshop Manual

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TROUBLESHOOTING
W6U701W03
S Y M P T O M T R O U B L E S H O O T IN G
Air conditioning system will not work at all.
TROUBLESHOOTING HINTS
Malfunction in heater control unit power supply circuit
• Fuse malfunction
• Malfunction in wiring harness between A/C 10 A fuse and heater control unit
Malfunction in heater control unit ground circuit
• Heater control unit malfunction
• Malfunction in wiring harness between heater control unit and ground
STEP INSPECTION
ACTION
Check A/C
10
A fu se .
Is it okay?
Yes Go to next step.
No Replace fuse, then go to step 4. If fuse bums out right
away, go to next step.
2
*
Turn ignition switch to ON.
Measure voltage at terminal 2L (IG2 signal) of
heater control unit 10-pin connector.
Is voltage approximately 12 V?
Yes Go to next step.
No Repair wiring harness between A/C 10 A fuse and heater
control unit, then go to step 4.
2 K 2 I
> <
-o
O
2 A
2 L
2 J 2 H | 2 F 2 D 2 B
W6U701WA0
Measure voltage at terminal 2J (GND signal)
of heater control unit 10-pin connector,
is voltage 0 V?
Yes Replace heater control unit, then go to next step.
No
Repair wiring harness between heater control unit and
ground, then go to next step.
HEATER
CONTROL
UNIT
2 K
2i > - <
2 A
2 L 2 J 2 H 1 2 F 2 D 2 B
Does A/C system operate correctly?
Yes
Troubleshooting completed. Explain repairs to customer.
No Reconfirm malfunction symptoms, then repeat from step 1
if malfunction reoccurs.
2
Illumination light and indicator light of each switch do not illuminate properly.
TROUBLESHOOTING HINTS
Malfunction in A/C switch indicator light circuit
• Step
1, 2
Malfunction in other indicator lights (except A/C switch indicator light) circuit
• Heater control unit malfunction
STEP
INSPECTION
ACTION
1
Turn ignition switch to ON.
Turn both A/C switch and fan switch on.
Does A/C switch indicator light illuminate?
Yes Go to next step.
No
Go to troubleshooting symptom No.4.
0 7 -0 1 -2