DIAGNOSTIC PROCEDURE
NO. 7 SPEEDOMETER INDICATION IS DEFECTIVE
SPEEDOMETER INDICATION IS DEFECTIVE POSSIBLE CAUSE TABLE
STEP
INSPECTION
ACTION
1
Turn the light switch to the TNS position.
Does the instrument cluster illumination
turn on?
Yes Troubleshooting completed.
No
Go to the next step.
2
Does the non-illumination include the entire
instrument cluster?
Yes Go to the next step.
No
Replace the instrument cluster.
3
Inspect the ROOM and ILLUMI fuse.
Are the fuses normal?
Yes Go to the next step.
No
Replace the fuse.
If the fuse is melted, inspect the
wiring harness for short to ground.
Repair or replace the wiring harness,
then replace the fuse.
4
Turn the ignition switch off.
Inspect the instrument cluster connector
terminals for poor connection (such as
damaged/pulled-out pins, and corrosion).
Are the terminals normal?
Yes Replace the instrument cluster.
No
Repair or replace the terminal.
7
Speedometer indication is defective
POSSIBLE CAUSE
ABS HU/CM or DSC HU/CM malfunction
PCM malfunction
Instrument cluster malfunction
Connector or pin malfunction
Short circuit in wiring harness between CAN-L, CAN-H and GND
Open circuit in CAN wiring harness (CAN-L, CAN-H)
CAN wiring harness (CAN-L, CAN-H) short each other
2007 Mazda MX-5 Miata Sport
2007 ACCESSORIES & BODY, CAB Symptom Troubleshooting (Instrument Cluster) - MX-5 Miata
Microsoft
Thursday, July 09, 2009 3:31:09 PM
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