DTC P0505:00 [MZR 1.6]

id0102h3704900

DTC P0505:00

IAC system problem
DETECTION CONDITION
•  The PCM cannot control idle speed toward target idle speed while KOER self test.
Diagnostic support note
•  This is continuous monitor (other).
•  The check engine light does not illuminate.
•  FREEZE FRAME DATA (Mode 2)/Snapshot data is not available.
•  DTC is not stored in the PCM memory.
POSSIBLE CAUSE
•  Improper operation of drive-by-wire control system
•  A/C relay control circuit malfunction
•  Generator control circuit malfunction
•  Air cleaner element restricted
•  Air intake passage clogged
•  Low engine compression (Over capacity of blow-by gas)
•  PCM malfunction

Diagnostic Procedure

STEP

INSPECTION

ACTION
1
VERIFY RELATED SERVICE INFORMATION AVAILABILITY
•  Verify related Service Information availability.
•  Is any related Service Information available?
Yes
Perform repair or diagnosis according to the available Service Information.
•  If the vehicle is not repaired, go to the next step.
No
Go to the next step.
2
VERIFY RELATED PENDING CODE AND STORED DTC
•  Switch the ignition off, then ON (engine off).
•  Verify the related PENDING CODE and stored DTCs using the M-MDS.
•  Is the DTC P2502:00, P2503:00 or P2504:00 also present?
Yes
Go to the applicable DTC inspection.
(See DTC P2502:00 [MZR 1.6].)
(See DTC P2503:00 [MZR 1.6].)
(See DTC P2504:00 [MZR 1.6].)
No
Go to the next step.
3
VERIFY DRIVE-BY-WIRE CONTROL SYSTEM OPERATION
•  Perform the Drive-by-wire Control System Inspection.
•  Does the drive-by-wire control system operate properly?
Yes
Go to the next step.
No
Repair or replace malfunctioning part according to the 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 the A/C switch off.
•  Is the magnetic clutch still on?
Yes
Go to the symptom troubleshooting “NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY”.
(See NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [MZR 1.6].)
No
Go to the next step.
5
INSPECT GENERATOR CONTROL CIRCUIT
•  Apply the electrical load.
•  Is the engine speed increased?
Yes
Go to the next step.
No
Repair or replace the generator control circuit for short to power supply, then go to Step 9.
6
INSPECT AIR CLEANER ELEMENT
•  Remove the air cleaner element with the engine running.
•  Is the engine speed increased?
Yes
Clean or replace the air cleaner element, then go to Step 9.
No
Go to the next step.
7
INSPECT THROTTLE BODY PASSAGE
•  Visually inspect the throttle body passage.
•  Is the throttle body clogged?
Yes
Clean or replace the throttle body passage, then go to Step 9.
(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [MZR 1.6].)
No
Go to the next step.
8
INSPECT ENGINE COMPRESSION
•  Inspect the engine compression.
•  Is there any malfunction?
Yes
Repair or replace the malfunctioning parts according to the inspection results, then go to the next step.
No
Go to the next step.
9
VERIFY DTC TROUBLESHOOTING COMPLETED
•  Always reconnect all disconnected connectors.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Perform the KOER self test.
•  Is the same DTC present?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the PCM.
Go to the next step.
No
Go to the next step.
10
VERIFY AFTER REPAIR PROCEDURE
•  Perform the “AFTER REPAIR PROCEDURE”.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZR 1.6].)
No
DTC troubleshooting completed.