Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

DTC P0505 [AJ] DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	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 diagnosis according to available repair Information. If the vehicle is not repaired, go to the next step.
1		No	Go to the next step.
2	VERIFY RELATED PENDING OR STORED DTCs Turn ignition switch to OFF, then ON. (Engine off) Verify pending code or stored DTCs using the WDS or equivalent. Does DTC P0506, P0507, P2100, P2101, P2105, P2107, P2110, P2112 or P2119 present?	Yes	Perform applicable DTC inspection. (See DTC TABLE .)
2		No	Go to the next step.
3	INSPECT ELECTRONIC THROTTLE CONTROL SYSTEM OPERATION Perform electronic throttle control system operation inspection. (See ELECTRONIC THROTTLE CONTROL INSPECTION .) Does electronic throttle control system work properly?	Yes	Go to the next step.
3		No	Repair or replace malfunctioning part according to electronic throttle control system operation inspection results, then go to Step 9.
4	INSPECT A/C MAGNETIC CLUTCH OPERATION NOTE: The following test should be performed for A/C. Go to the next step for vehicles without A/C. Turn blower motor switch to off. Is magnetic clutch still on?	Yes	Go to "A/C ALWAYS ON/A/C COMPRESSOR RUNS CONTINUOUSLY" of ENGINE SYMPTOM TROUBLESHOOTING, then go to step 9. (See NO. 24 A/C ALWAYS ON/A/C COMPRESSOR RUNS CONTINUOUSLY .)
4		No	Go to the next step.
5	INSPECT GENERATOR CONTROL CIRCUIT MALFUNCTION Apply electrical load at idle. Is engine speed increased?	Yes	Go to the next step.
5		No	Repair short to power supply in generator control circuit, then go to Step 9.
6	INSPECT AIR CLEANER ELEMENT Remove air cleaner element with engine running. Is engine speed increased?	Yes	Clean or replace air cleaner element, then go to Step 9.
6		No	Go to the next step.
7	INSPECT THROTTLE BODY PASSAGE Is throttle body clogged?	Yes	Clean or replace throttle body passage, then go to Step 9.
7	INSPECT THROTTLE BODY PASSAGE Is throttle body clogged?	No	Go to the next step.
8	INSPECT ENGINE COMPRESSION Inspect engine compression. (See COMPRESSION INSPECTION .) Is engine compression normal?	Yes	Go to the next step.
8		No	Overhaul engine, then go to the next step.
9	VERIFY TROUBLESHOOTING OF DTC P0505 COMPLETED Make sure to reconnect all disconnected connectors. Clear DTC using the WDS or equivalent. Perform KOER self-test. Is same DTC present?	Yes	Replace PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION .)
9		No	Go to the next step.
10	VERIFY AFTER REPAIR PROCEDURE Perform "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE .) Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE .)
10		No	Troubleshooting completed.