Diagnostic procedure

NO. 4 CHECK ENGINE LIGHT ILLUMINATES (INSTRUMENT CLUSTER) DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	Start the engine. Does the check engine light turn off?	Yes	Troubleshooting completed. (The system is normal.)
1	Start the engine. Does the check engine light turn off?	No	Go to the next step.
2	Reactive the DTC of instrument cluster using MMDS. (See DTC INSPECTION .) Is the DTC detected?	Yes	If the DTC U0401:68 or U0401:92 is not detected: Go to the applicable DTC troubleshooting procedure. (See DTC TABLE .) If the DTC U0401:68 or U0401:92 is detected: (See ON-BOARD DIAGNOSTIC TEST .)
2		No	Go to the next step.
3	Turn off the check engine light using M-MDS instrument cluster active command modes WL+IL. (See ACTIVE COMMAND MODES TABLE .) Does the check engine light turn off according to active command modes?	Yes	Go to the next step.
3		No	Replace the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION .)
4	Disconnect the negative battery cable. Measure the resistance between the DLC-2 terminals F and E. Is the resistance below 60 ohms?	Yes	Go to the next step.
4		No	Go to Step 6.
5	Inspect the DLC-2 terminals F and E for short to power supply or ground. Is there any malfunction?	Yes	Inspect the wiring harness and CAN system-related module. Repair or replace the malfunctioning part.
5		No	Replace the instrument cluster.
6	Switch the ignition OFF (LOCK). Inspect the instrument cluster connector terminals for poor connection (such as damaged/pulled-out pins, and corrosion). Are the terminals normal?	Yes	Go to the next step.
6		No	Repair or replace the terminal.
7	Disconnect the negative battery cable. Measure the resistance between the instrument cluster connector terminals B and D. Is the resistance 114-126 ohms?	Yes	Inspect the wiring harness and CAN system-related module. Repair or replace the malfunctioning part.
7	Courtesy of MAZDA MOTORS CORP.	No	Replace the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION .)