Mazda MX-6 1998, Workshop Manual

Page: 909 / 1282

TROUBLESHOOTING
STEP
INSPECTION
ACTION
17’
Remove A/C relay.
Turn Ignition switch to ON.
Turn A/C switch off.
Measure voltage at terminal A (IG2 signal) of
A/C relay on main fuse block side.
Is voltage
approximately 12 V?
M A I N F U S E B L O C K
W 6 U 7 0 1 W A M
Yes
Go to next step.
No
Repair wiring harness between WIPER 20 A fuse and A/C
relay, then go to step 25.
18
Inspect A/C relay.
tr
0 7 -4 0 A/C RELAY INSPECTION
Is it okay?
Yes Install A/C relay, then go to next step.
No Replace A/C relay, then go to step 25.
19’ Turn A/C switch off.
Measure voltage at test pin 69 (IG2 signal) of
PCM.
sr 0 7 -40A PCM INSPECTION
i d -
07-40B PCM INSPECTION
Is voltage approximately 12 V? _____
Yes Go to next step.
No Repair wiring harness between A/C relay and PCM, then
go to step 25.
20
*
Inspect Input signal parts (power steering
pressure switch, engine coolant temperature
sensor, crankshaft position sensor, throttle
position sensor, A/C switch and refrigerant
pressure switches, excluding wiring harness)
of PCM (A/C cut control).
Are they okay?
Yes
Replace PCM, then go to step 25.
No
Replace input signal parts, then go to step 25.
21 Is COOLING FAN 40 A fuse okay?
Yes Go to next step.
No Replace COOLING FAN 40 A fuse, then go to step 25. If
fuse burns out right away, go to next step.
22
*
Remove A/C relay.
Measure voltage at terminal B (A/C control
signal) of A/C relay on main fuse block side.
Is voltage approximately 12 V?
Yes Go to next step.
No Repair wiring harness between COOLING FAN 40 A fuse
and A/C relay, then go to step 25.
M A I N F U S E B L O C K
W 6 U 7 0 1 W A P
23 Inspect A/C relay.
sr 0 7 -4 0 A/C RELAY INSPECTION
Is it okay?__________________________
Yes Install A/C relay, then go to next step.
No Replace A/C relay, then go to step 25.
0 7 -0 1 -1 0