Mazda MX-6 1998, Workshop Manual, Page: 913 / 1282

TROUBLESHOOTING
8 Air intake mode does not change.
TROUBLESHOOTING HINTS
Malfunction in air intake link circuit
• Air intake link malfunction
Malfunction in IG2 signal circuit of air intake actuator
• Malfunction in wiring harness between A/C 10 A fuse and air intake actuator
Malfunction in air intake actuator circuit
• Air intake actuator malfunction
Malfunction in RECIRCULATE and FRESH signal circuit of heater control unit
• Malfunction in wiring harness between heater control unit and air intake actuator
Malfunction in air intake door circuit
• Heater control unit malfunction
• Air intake door malfunction
STEP INSPECTION
ACTION
Inspect air intake link.
• Is link securely and properly Installed?
• Is link free of obstructions and hindrances?
Are above items okay? __________
Yes Go to next step.
No
Install link in proper position. If link is damaged, replace it,
then go to step 7.
2
*
Measure voltage at terminal B (IG-2 signal) of
air intake actuator connector.
Is voltage a p p ro x im a te ly 12 V?
Yes Go to next step.
*
X
* *
H * D B
No
Repair wiring harness between A/C 10 A fuse and air
intake actuator, then go to step 7.
A I R I N T A K E A C T U A T O R
W 6 U 7 0 1 W A R
Remove air intake actuator.
Turn ignition switch to ON.
Set fan switch at fourth position.
Is each air intake mode (RECIRCULATE,
FRESH) accessed smoothly when air intake
link is operated by hand.
Yes Go to next step.
No Go to step 6.
Inspect air intake actuator.
j y 0 7 -4 0 AIR INTAKE ACTUATOR
INSPECTION
Is it okay?
Yes Go to next step.
No Replace air intake actuator, then go to step 7.
5*
Turn ignition switch to LOCK.
Disconnect heater control unit 14-pin
connector.
Check if there Is continuity between the
following terminals.
• Terminal 1H (14-pin, heater control unit) ■
terminal H (air intake actuator)
• Terminal 1J (14-pin, heater control unit) -
terminal D (air intake actuator)
Are there continuities?
Yes Go to next step.
1 0
1 M 1 K
1 E 1 C 1 A
*
1 N 1 L 1 j | 1 H 1 F 1 D 1 B
#
X
*
*
H
*
D B
No
Repair wiring harness between heater control unit and air
intake actuator, then go to step
7.
H E A T E R C O N T R O L U N I T
1 4 - P I N C O N N E C T O R
A I R I N T A K E
A C T U A T O R
C O N N E C T O R
W 6 U 7 0 1 W A S
Check if there is no continuity between the
above terminals and ground.
Are there no continuities?
0 7 -0 1 -1 4