Mazda RX-8 Manual page 1993

Diagnostic procedure
STEP INSPECTION
Disconnect car-navigation unit connector (16-pin).
•
Jack up vehicle and run engine at low speed.
•
Measure voltage at the following terminal of car-
•
navigation unit connector (16-pin):
Terminal 1H (Vehicle speed signal)
1
Is voltage approx. 2.5 V (reference)?
•
NOTE:
Vehicle speed signal is in electrical pulses of approx. 0
•
V to 5 V .
Disconnect ABS HU/CM connector (28-pin) or DSC
•
HU/CM connector (34-pin).
Is there continuity between car-navigation unit
•
2*
connector (16-pin) terminal 1H and ABS HU/CM
connector (28-pin) terminal V, or car-navigation unit
connector (16-pin) terminal 1H and DSC HU/CM
connector (34-pin) terminal AA?
Inspect wiring harness between car-navigation unit
•
connector (16-pin) terminal 1H and ABS HU/CM
3
connector (28-pin) terminal V, or car-navigation unit
connector (16-pin) terminal 1H and DSC HU/CM
connector (34-pin) terminal AA for short to ground.
Is there short to ground?
•
4
Does vehicle locator mark operate normally?
•
ACTION
Replace car-navigation unit
(available at Clarion service
Yes center) or get it repaired at
Panasonic service center, then go
to Step 4.
No Go to next step.
Yes Go to next step.
Repair wiring harness between
car-navigation unit and ABS
No HU/CM, or car-navigation unit
and DSC HU/CM, then go to Step
4.
Repair wiring harness between
car-navigation unit and ABS
Yes HU/CM, or car-navigation unit
and DSC HU/CM, then go to next
step.
Replace instrument cluster, then
No
go to next step.
Complete troubleshooting, then
Yes
explain repairs to customer.
Recheck malfunction symptoms,
No then repeat from Step 1 if
malfunction recurs.
(w) RX-8 Body
Page 275