DTC P0505:00 [MZR 1.8, MZR 2.0, MZR 2.5]

id0102f4704900

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

•  The MIL does not illuminate.

•  FREEZE FRAME DATA (Mode 2)/Snapshot data is not available.

•  The DTC is not stored in the PCM memory.

POSSIBLE CAUSE

•  Drive-by-wire control system improper operation

•  A/C relay control circuit malfunction

•  Generator control circuit malfunction

•  Air cleaner element clogged

•  Air intake passage clogged (throttle body clogged)

•  Low engine compression (over capacity of blow-by gas)

•  PCM malfunction

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 • The MIL does not illuminate. • FREEZE FRAME DATA (Mode 2)/Snapshot data is not available. • The DTC is not stored in the PCM memory.
POSSIBLE CAUSE	• Drive-by-wire control system improper operation • A/C relay control circuit malfunction • Generator control circuit malfunction • Air cleaner element clogged • Air intake passage clogged (throttle body 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.
1		No	Go to the next step.
2	VERIFY DRIVE-BY-WIRE CONTROL SYSTEM OPERATION • Perform the throttle position (TP) sweep inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 1.8, MZR 2.0, MZR 2.5].) • Does the drive-by-wire control system work properly?	Yes	Go to the next step.
2		No	Repair or replace the malfunctioning part according to the inspection results, then go to Step 8.
3	INSPECT A/C MAGNETIC CLUTCH OPERATION • Turn the fan switch off. • Is the magnetic clutch still on?	Yes	Perform 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 1.8, MZR 2.0, MZR 2.5].)
3		No	Go to the next step.
4	INSPECT GENERATOR CONTROL CIRCUIT MALFUNCTION • Apply the electrical load. • Does the engine speed increase?	Yes	Go to the next step.
4		No	Repair or replace the generator control circuit for a possible short to power supply, then go to Step 8.
5	INSPECT AIR CLEANER ELEMENT • Remove the air cleaner element with the engine running. • Does the engine speed increase?	Yes	Clean or replace the air cleaner element, then go to Step 8.
5		No	Go to the next step.
6	INSPECT THROTTLE BODY PASSAGE • Visually inspect the throttle body passage. • Is the throttle body passage clogged?	Yes	Clean or replace the throttle body passage, then go to Step 8. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [MZR 1.8, MZR 2.0, MZR 2.5].)
6		No	Go to the next step.
7	INSPECT ENGINE COMPRESSION • Inspect the engine compression. (See COMPRESSION INSPECTION [MZR 1.8, MZR 2.0, MZR 2.5].) • Is there any malfunction?	Yes	Overhaul the engine for repairs, then go to the next step.
7		No	Go to the next step.
8	VERIFY DTC TROUBLESHOOTING COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE [MZR 1.8, MZR 2.0, MZR 2.5].) • Perform the KOER self test. (See KOEO/KOER SELF TEST [MZR 1.8, MZR 2.0, MZR 2.5].) • Is the same DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [MZR 1.8, MZR 2.0, MZR 2.5].)
8		No	Go to the next step.
9	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [MZR 1.8, MZR 2.0, MZR 2.5].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZR 1.8, MZR 2.0, MZR 2.5].)
9		No	DTC troubleshooting completed.