Check Code 08

WARNING: This page is about a different car, the 2007 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.

CHECK CODE 08

Check code 08		TNS relay ON/OFF signal
STEP	INSPECTION CONDITION	DISPLAY	ACTION
1	Turn the headlight switch to the TNS position. (TNS relay ON)	Courtesy of MAZDA MOTORS CORP.	Go to the next step.
1		Courtesy of MAZDA MOTORS CORP.	Verify that the voltage of instrument cluster terminal 1B is B+. If the voltage is as specified, replace the instrument cluster. If the voltage is not as specified, inspect the following parts: TNS relay Wiring harness (Battery-TNS relay-instrument cluster)
2	Turn the headlight switch off. (TNS relay OFF)	Courtesy of MAZDA MOTORS CORP.	Verify that the voltage of the instrument cluster terminal 1B is 1.0 V or less. If the voltage is as specified, replace the instrument cluster. If the voltage is not as specified, inspect the following parts: TNS relay Wiring harness (TNS relay-instrument cluster)
2	Turn the headlight switch off. (TNS relay OFF)	Courtesy of MAZDA MOTORS CORP.	Input signal to the instrument cluster is normal.