Check Code 28

CHECK CODE 28

Check code 28	Oil pressure gauge operation signal
INSPECTION CONDITION	DISPLAY	ACTION
After selecting check code 28, wait approx. 2 s.	Courtesy of MAZDA MOTORS CORP.	The oil pressure gauge indicates status in the following order approx. every 2 s. H --> Center --> L --> H (fixed)	The oil pressure gauge is normal.
	Courtesy of MAZDA MOTORS CORP.	Except above	Replace the instrument cluster.
	Courtesy of MAZDA MOTORS CORP.	Replace the instrument cluster
1	Remove the key from the steering lock, then reinsert the key into the steering lock after selecting check code 31. (The key reminder switch is 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 2C is B+. If the voltage is as specified, replace the instrument cluster. If the voltage is not as specified, inspect the following parts: Key reminder switch Wiring harness (Battery-key reminder switch-instrument cluster)
2	Remove the key from the steering lock. (The key reminder switch is off.)	Courtesy of MAZDA MOTORS CORP.	Verify that the voltage of instrument cluster terminal 2C 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: Key reminder switch Wiring harness (Key reminder switch-instrument cluster)
2		Courtesy of MAZDA MOTORS CORP.	Input signal to the instrument cluster is normal.