Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2006 Mazda MPV ESFACTORY OEM SERVICE PROCEDURE

DTC P0505: Notes

DTC P0505 [AJ] DETECTION CONDITION AND POSSIBLE CAUSES

DTC P0505	IAC system malfunction
DETECTION CONDITION	The PCM cannot control the idle speed toward the target idle speed during the KOER self test.
POSSIBLE CAUSE	IAC valve circuit malfunction Short to ground between IAC valve terminal A and PCM terminal 87 Open circuit between IAC valve terminal A and PCM terminal 87 Short to ground between IAC valve terminal B and PCM terminal 88 Short to power between IAC valve terminal B and PCM terminal 88 Open circuit between IAC valve terminal B and PCM terminal 88 Poor connection of IAC valve connector or PCM connector PCM malfunction
Courtesy of MAZDA MOTORS CORP.

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.