Mazda MX-6 1998, Workshop Manual

Page: 908 / 1282

TROUBLESHOOTING
STEP INSPECTION
ACTION
11
*
Disconnect refrigerant pressure switch (HI)
connector.
Start engine.
Turn both A/C switch and fan switch on.
Measure voltage at terminal A (A/C signal) of
refrigerant pressure switch (HI) connector of
wiring harness.
Is voltage a p p ro x im a te ly 12 V?
W 6 U 7 0 1 W A H
Yes Go to step 13.
No
Go to next step.
12* Measure voltage at test pin 41 (A/C signal) of
PCM.
tr 01—40A PCM INSPECTION
D- 0 1 -40B PCM INSPECTION
Is voltage a p p ro x im a te ly 12 V?
Yes Repair wiring harness between PCM and refrigerant
pressure switch (HI), then go to step 25.
No PCM inspection completed. Go to step 25.
13*
Check if there is continuity between the
following terminals.
• Terminal B (refrigerant pressure switch
(H l))-term inal A (refrigerant pressure
switch (LO))
Is there continuity?
Yes Go to next step.
No
Repair wiring harness between refrigerant pressure switch
(HI) and (LO), then go to step 25.
REFRIGERANT PRESSURE
SWITCH (HI) CONNECTOR REFRIGERANT PRESSURE
SWITCH (LO) CONNECTOR
W 6 U 7 0 1 W A K
14
Connect heater control unit 14-pin connector
and refrigerant pressure switch (LO)
connector.
When terminals A and B of refrigerant
pressure switch connector (HI) at wiring
harness are shorted, is cool air discharged?
R E F R I G E R A N T
P R E S S U R E
S W I T C H ( H I )
Yes Replace refrigerant pressure switch (HI), then go to step
25.
No Reconfirm malfunction symptoms.
r
A B
W6U701WAL
15
When A/C switch is operated OFF to ON, is
operation sound heard from A/C relay?
Yes Go to step 21.
No Go to next step.
16
Is WIPER 20 A fuse okay? Yes
Go to next step.
No
Replace WIPER 20 A fuse, then go to step 25. If fuse
burns out right away, go to next step._______________
07
0 7 -0 1 -9