DIAGNOSTIC PROCEDURE
DTC P0505 (MZI-3.7) DIAGNOSTIC PROCEDURE
DTC P0505
Idle speed control system problem
DETECTION
CONDITION
z
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
z
Failure mode effects management condition is present
z
Intake air restriction
z
Exhaust restriction
z
Sludged throttle body
z
Vacuum leakage
z
Throttle body malfunction
z
PCM malfunction
NOTE:
z
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 self-test.
STEP
INSPECTION
ACTION
1
VERIFY FREEZE FRAME DATA
HAS BEEN RECORDED
z
Has FREEZE FRAME DATA been
recorded?
Yes Go to the next step.
No
Record FREEZE FRAME DATA on the repair
order, then go to the next step.
2
VERIFY RELATED REPAIR
INFORMATION AVAILABILITY
z
Verify related Service Bulletins
and/or on-line repair information
availability.
z
Is any related Service Bulletins
available?
Yes
Perform repair or diagnosis according to the
available Service Bulletins.
z
If the vehicle is not repaired, go to the next
step.
No
Go to the next step.
3
VERIFY RELATED PENDING CODE
OR STORED DTCs
z
Turn the ignition switch off then to
the ON position (Engine off).
z
Verify related pending code or
stored DTCs.
z
Are other DTCs present?
Yes
Go to the appropriate DTC troubleshooting. (See
DTC TABLE [MZI-3.7]
.)
No
Go to the next step.
2008 Mazda CX-9 Grand Touring
2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:08:38 AM
Page 240
© 2005 Mitchell Repair Information Company, LLC.
