Mazda 6 2002 - Dtc P0505

F144
ON-BOARD DIAGNOSTIC
End Of Sie
DTC P0505
A6E397001087W02
Diagnostic procedure
11 VERIFY TROUBLESHOOTING OF DTC P0500
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Turn ignition key to ON (Engine OFF).
• Clear DTC from PCM memory using WDS or
equivalent.
• Warm up engine.
• Access RPM and LOAD PID using WDS or
equivalent.
• Drive vehicle under following conditions for
18s.
 Engine speed: 2,000 rpm or above
 Gear: Gear is in other than NEUTRAL
 Load: 40% or above
• Is PENDING CODE the same as DTC
present?
Yes Replace PCM, then go to next step.
(See F43 PCM REMOVAL/INSTALLATION.)
No Go to next step.
12 VERIFY AFTER REPAIR PROCEDURE
• Perform After Repair Procedure.
(See F66 AFTER REPAIR PROCEDURE.)
• Is there any DTC present?
Yes Go to applicable DTC troubleshooting.
(See F67 DTC TABLE.)
No Troubleshooting completed.
STEP INSPECTION ACTION
DTC P0505 IAC valve circuit malfunction
DETECTION
CONDITION
• PCM cannot control idle speed toward target idle speed while KOER self test.
POSSIBLE
CAUSE
• IAC valve circuit malfunction
• Air cleaner element clogged
• Air intake passage clogged
• A/C relay control circuit malfunction
• Generator control circuit malfunction
• Low engine compression (Over capacity of blow-by gas)
• PCM malfunction
STEP INSPECTION ACTION
1 VERIFY RELATED SERVICE INFORMATION
AVAILABILITY
• Check for related Service Information
availability.
• Is any related Service Information available?
Yes Perform repair or diagnosis according to available Service
Information.
• If vehicle is not repaired, go to next step.
No Go to 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
WDS or equivalent.
• Does DTC P0511,P2502, P2503 or P2504
present?
Yes Perform applicable DTC troubleshooting.
(See F67 DTC TABLE.)
No Go to next step.
3 INSPECT IAC VALVE MALFUNCTION
• Start engine.
• Disconnect IAC valve connector.
• Is engine speed decreased?.
Yes Go to next step.
No Repair IAC valve, then go to Step 9.
4 INSPECT A/C MAGNETIC CLUTCH
OPERATION
Note
• The following test should be performed for
A/C.go to 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 F181 ENGINE SYMPTOM TROUBLESHOOTING.)
No Go to next step.