Mazda MX-6 1998, Workshop Manual

Page: 905 / 1282

TROUBLESHOOTING
STEP INSPECTION
ACTION
14 Inspect heater unit’s air mix links, air mix
cranks, and air mix rod.
• Is there grease on links and cranks?
• Are links, cranks, and rod securely and
properly installed?
Are above items okay?
Yes
Go to next step.
No Apply grease or properly and securely install links, cranks,
and rod, then go to step 19.
15 Remove air mix actuator.
Turn ignition switch to ON.
Set fan switch at fourth position.
Inspect heater unit.
• Does groove of links on heater unit have
no dust on it?
• Does temperature of discharged air change
smoothly when air mix link is operated by
hand?
Yes
Go to next step.
No
If any links have dust on it, remove dust, then go to step
19. If temperature of discharged air does not change
smoothly, then go to step 17.
16 Inspect air mix actuator.
c r 07—40 AIR MIX ACTUATOR
INSPECTION
Is it okay?
Yes
Go to next step.
No
Replace air mix actuator, then go to step 17.
17 Is there foreign material or obstruction in
heater unit’s air mix doors? Yes Remove obstruction, then go to step 7.
No Go to next step.
18
Inspect heater unit’s air mix doors.
• Are doors free of cracks and damage?
• Are doors securely and properly installed?
Are above items okay?
Yes Replace heater control unit, then go to next step.
No
Replace any doors, or install doors in proper position, then
go to next step.
19 Does temperature of discharged air change
when temperature control dial is operated?
Yes Troubleshooting completed. Explain repairs to customer.
No Reconfirm malfunction symptoms, then repeat from step 1
if malfunction reoccurs.
No cool air.
TROUBLESHOOTING HINTS
Malfunction in A/C switch indicator light circuit
Heater control unit malfunction
Malfunction in wiring harness between heater control unit and fan switch
Malfunction in drive belt circuit
Drive belt malfunction
Malfunction in A/C signal (between heater control unit, refrigerant pressure switch, and PCM) circuit
Refrigerant pressure switch (LO) malfunction
Refrigerant pressure switch (HI) malfunction
PCM malfunction
Malfunction in wiring harness between refrigerant pressure switch (LO) and heater control unit
Malfunction in wiring harness between PCM and refrigerant pressure switch (HI)
Malfunction in wiring harness between refrigerant pressure switch (HI) and refrigerant pressure switch (LO)
Malfunction in A/C relay (IG2 signal) circuit
WIPER 20 A fuse malfunction
A/C relay malfunction
Malfunction in wiring harness between WIPER 20 A fuse and A/C relay
Malfunction in PCM (IG2 signal) circuit
Malfunction in wiring harness between A/C relay and PCM
Malfunction in A/C cut control circuit of PCM
PCM malfunction
Input signal parts malfunction
Malfunction in A/C relay (A/C control signal) circuit
COOLING FAN 40 A fuse malfunction
A/C relay malfunction
Malfunction in wiring harness between COOLING FAN 40 A fuse and A/C relay
Malfunction in A/C compressor (A/C control signal) circuit
Magnetic clutch malfunction
Malfunction in wiring harness between A/C relay and magnetic clutch
STEP INSPECTION ACTION
Is air discharged? Yes Go to next step.
No Go to symptom troubleshooting No. 6, 7.
0 7 -0 1 -6