Diagnostic Procedure

DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	Start the engine, and drive the vehicle. Does the speedometer needle move smoothly? Does the speedometer needle indicate correct speed?	Yes	Troubleshooting completed.
1		No	Go to the next step.
2	Do the tachometer, the water temperature gauge, and the oil pressure gauge operate normally?	Yes	Go to the next step.
2		No	Go to Step 4.
3	Start the instrument cluster input/output check mode. Inspect the speedometer using the check code 12. Is the speedometer normal?	Yes	Inspect the ABS HU/CM, DSC HU/CM, or connectors.
3		No	Replace the instrument cluster.
4	Start the engine. Does the ABS warning light turn off?	Yes	Inspect the PCM or connectors.
4	Start the engine. Does the ABS warning light turn off?	No	Replace the instrument cluster.
5	Disconnect the negative battery cable. Measure the resistance between the DLC-2 terminals F and E. Is the resistance 54-66 ohms ?	Yes	Go to the next step.
5		No	Go to Step 7.
6	Disconnect the negative battery cable. Inspect the DLC-2 terminals F and E for short to power supply or GND. Is there any malfunction?	Yes	Inspect the wiring harness and CAN system-related module. Repair or replace the malfunctioning part.
6		No	Replace the instrument cluster.
7	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? Courtesy of MAZDA MOTORS CORP.	Yes	Go to the next step.
7		No	Repair or replace the terminal.
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.
8		No	Replace the instrument cluster.