NO. 8 TACHOMETER INDICATION IS DEFECTIVE
TACHOMETER INDICATION IS DEFECTIVE POSSIBLE CAUSE TABLE
DIAGNOSTIC PROCEDURE
DIAGNOSTIC PROCEDURE
8
Disconnect the negative battery cable.
Measure the resistance between the instrument
cluster connector terminals 1J and 1L.
Is the resistance
114-126 ohms
?
Yes
Inspect the wiring harness and CAN
system-related module. Repair or
replace the malfunctioning part.
No
Replace the instrument cluster.
8
Tachometer indication is defective
POSSIBLE CAUSE
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
STEP
INSPECTION
ACTION
1
Start the engine.
Does the tachometer needle move
smoothly?
Does the tachometer needle indicate
correct engine speed?
Yes Troubleshooting completed.
No
Go to the next step.
2
Do the speedometer, the water temperature
gauge, and the oil pressure gauge operate
normally?
Yes Go to the next step.
No
Go to Step 4.
3
Start the instrument cluster input/output check
mode.
Inspect the tachometer using the check code 13.
Yes Inspect the PCM or connectors.
No
Replace the instrument cluster.
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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