Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.

NO 2 DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	INSPECT EPS CONTROL MODULE AND DLC-2 FOR CONTINUITY OR SHORT Perform the DTC inspection. Is an error message regarding the communication between the EPS control module and the WDS or equivalent displayed?	Yes	If a communication error message is displayed even after inspecting according to the procedures displayed on the WDS or equivalent, go to Step 5.
1		No	Go to the next step.
2	INSPECT FOR DTCS IN EPS CONTROL MODULE Have DTCs been recorded in the memory?	Yes	Perform inspection using the appropriate DTC.
2		No	Go to the next step.
3	INSPECT PID/DATA IN EPS CONTROL MODULE Select the following items using the WDS or equivalent Datalogger function. EPSLAMP (EPS warning light) Is the EPSLAMP ON after the engine is already running?	Yes	Repeat the DTC inspection. If no DTCs have been recorded in the memory, replace the EPS control module. (See EPS CONTROL MODULE REMOVAL/INSTALLATION .)
3		No	The EPS system is normal. Go to the next step.
4	INSPECT WIRING HARNESS FOR CONTINUITY BETWEEN EPS CONTROL MODULE AND INSTRUMENT CLUSTER Disconnect the EPS control module connector and the instrument cluster connector. Inspect for continuity between the EPS control module and the instrument cluster at the following terminals. Terminal 2M (13-pin) and terminal 1J (12-pin) Terminal 2K (13-pin) and terminal 1L (12-pin) Is there continuity?	Yes	Inspect the instrument cluster. (EPS warning light circuit malfunction in the instrument cluster) (See INSTRUMENT CLUSTER INPUT/OUTPUT CHECK MODE .)
4		No	Repair the wiring harness between the EPS control module and the instrument cluster, then reinspect the malfunction symptoms.
5	INSPECT WIRING HARNESS FOR CONTINUITY BETWEEN EPS CONTROL MODULE AND DLC-2 Disconnect the EPS control module connector. Inspect for continuity between the EPS control module and the DLC-2 at the following terminals. Terminal 2M (13-pin) and CAN_H terminal (16-pin) Terminal 2K (13-pin) and CAN_L terminal (16-pin) Is there continuity?	Yes	Go to the next step.
5		No	Repair the wiring harness between the EPS control module and the DLC-2, then repeat from Step 1 if the malfunction.
6	INSPECT VOLTAGE AT EPS CONTROL MODULE Measure the voltage at EPS control module connector terminal 2P (13-pin, IG1 signal). Is the voltage within the following range? IG ON: 10-16 V	Yes	Inspect the EPS control module connectors, then repeat from Step 1 if the malfunction recurs. If the same symptoms recur, replace the EPS control module. (See EPS CONTROL MODULE REMOVAL/INSTALLATION .)
6		No	Inspect the battery. If the battery condition is normal, inspect and repair the EPS control module wiring harness (IG1 signal). Reinspect the malfunction symptoms.