DTC P0505:00 [MZI-3.7]: Notes

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

DETECTION CONDITION & POSSIBLE CAUSE

DTC P0505:00	Idle speed control system problem
DETECTION CONDITION	The PCM attempts to control engine speed during the KOER self-test. The test fails when the desired engine speed could not be reached or controlled during the self-test.
POSSIBLE CAUSE	Intake air restriction Vacuum leakage Throttle body malfunction Slugged throttle body Mechanical concern with engine Exhaust restriction Failure mode effects management condition is present PCM malfunction NOTE: This DTC is informational only and it may be accompanied by other DTCs Diagnose other DTCs first If other DTCs are not present inspect the intake air system for air restrictions, vacuum leaks, and damage If no concerns are present, clear the DTC and repeat the KOER self-test

DTC P0505:00

Idle speed control system problem

DETECTION CONDITION

The PCM attempts to control engine speed during the KOER self-test. The test fails when the desired engine speed could not be reached or controlled during the self-test.

POSSIBLE CAUSE

Intake air restriction
Vacuum leakage
Throttle body malfunction
Slugged throttle body
Mechanical concern with engine
Exhaust restriction
Failure mode effects management condition is present
PCM malfunction
NOTE:
- This DTC is informational only and it may be accompanied by other DTCs Diagnose other DTCs first If other DTCs are not present inspect the intake air system for air restrictions, vacuum leaks, and damage If no concerns are present, clear the DTC and repeat the KOER self-test