Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.

DTC P0550 [BP, BP WITH TC] DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED Has FREEZE FRAME DATA been recorded?	Yes	Go to the next step.
1		No	Record FREEZE FRAME DATA on repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Check for related Service Bulletins and/or online repair information availability. Is any related repair information available?	Yes	Perform repair or diagnostic according to the available repair information. If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	INSPECT PSP SWITCH CONNECTOR AND PCM CONNECTOR FOR POOR CONNECTION Turn the ignition switch off. Disconnect PSP switch connector and PCM connector. Check for poor connection (damaged, pulled-out terminals, corrosion, etc.). Is there any malfunction?	Yes	Repair or replace the terminal, then go to Step 6.
3		No	Go to the next step.
4	INSPECT PSP SWITCH Inspect PSP switch. (See POWER STEERING PRESSURE (PSP) SWITCH INSPECTION ) Is it normal?	Yes	Replace the PSP switch, then go to Step 6.
4		No	Go to the next step.
5	INSPECT PSP SWITCH SIGNAL CIRCUIT FOR SHORT TO GND Check continuity between PSP switch terminal (harness-side) and body GND. Is there continuity?	Yes	Repair or replace harness for short to GND, then go to Step 6.
5		No	Go to the next step.
6	VERIFY TROUBLESHOOTING OF DTC P0550 COMPLETED Make sure to connect all disconnected connectors. Start the engine. Clear the DTC from the PCM memory using the WDS or equivalent. Drive vehicle above 60.1 km/h {37.3 mph} for 1 min . Verify that ECT PID above 60°C {140°F} using the WDS or equivalent. Is same DTC present?	Yes	Replace PCM, then go to the next step.
6		No	Go to the next step.
7	VERIFY AFTER REPAIR PROCEDURE Perform the "AFTER REPAIR PROCEDURE ". (See AFTER REPAIR PROCEDURE ) Is any DTC present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE )
7		No	Troubleshooting completed.