Mazda MX-6 1998, Workshop Manual

Page: 1008 / 1282

TROUBLESHOOTING [POWER DOOR LOCK SYSTEM]
STEP
INSPECTION
ACTION
Measure voltage at joint box terminals 1C and
1J.
Terminal 1C: B+ (IG ON), 0 V (IG LOCK)
Terminal 1J: B+ (constantly)
Are voltages okay?
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ig
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II I
u
V
8
m
W 6 U 9 0 1 W H 2
Yes Turn ignition switch off and install CPU to joint box
securely.
If on-board diagnostic function 1 is inoperative, go to next
step.
If on-board diagnostic function 2 is inoperative, go to step
7.
No Check ignition switch.
If it is okay, check for open circuit between fuse panel and
joint box terminal 1C or 1J.
Make sure that driver’s side door is open.
Connect volt-meter between CPU connector
terminal 2 0 and ground.
Perform following procedures
within 30
seconds:
© Repeat following four times:
• Turn ignition switch ON.
• Turn ignition switch LOCK.
§ Remove ignition key from steering lock.
Repeat following three times:
• Push driver’s side door switch.
• Release driver’s side door switch.
Measure voltage at CPU connector terminal
2 0
.
• 5 V (during performing the above
procedures) -> 0 V (until on-board
diagnostic activate verification buzzer
sounds)
Is voltage 0 V?
Yes Go to step 8.
No Visually check for bents or other damage to CPU
connector terminals.
If terminals are okay, replace CPU.
i
20 2 y 21 2G 2E 2C 2A
2P 2N
2J 2H 2F 20 28
W 6 U 9 0 1 W E 3
0 9 -0 1 E -1 0