DTC P0505:00 [MZR 2.0, MZR 2.5]

id0102g3704900

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 a continuous monitor (other).

•  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

•  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 • This is a continuous monitor (other). • 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 • 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 RELATED PENDING CODE AND STORED DTC • Switch the ignition to off, then to ON (engine off). • Perform the DTC Reading Procedure and Pending Trouble Code Access Procedure. (See ON-BOARD DIAGNOSTIC TEST [MZR 2.0, MZR 2.5].) • Are any other DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZR 2.0, MZR 2.5].)
2		No	Go to the next step.
3	VERIFY DRIVE-BY-WIRE CONTROL SYSTEM OPERATION • Perform the TP sweep inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZR 2.0, MZR 2.5].) • Is there any malfunction?	Yes	Repair or replace the malfunctioning parts according to the inspection results, then go to Step 9.
3		No	Go to the next step.
4	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 2.0, MZR 2.5].)
4		No	Go to the next step.
5	INSPECT GENERATOR CONTROL CIRCUIT MALFUNCTION • Apply the electrical load. • Is the engine speed increased?	Yes	Go to the next step.
5		No	Repair 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. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [MZR 2.0, MZR 2.5].) • Is the engine speed increased?	Yes	Clean or replace the air cleaner element, then go to Step 9.
6		No	Go to the next step.
7	INSPECT THROTTLE BODY PASSAGE • Switch the ignition to off. • Visually inspect the throttle body passage. • Is the throttle body passage clogged?	Yes	Clean or replace the throttle body passage, then go to Step 9.
7		No	Go to the next step.
8	INSPECT ENGINE COMPRESSION • Inspect the engine compression. (See COMPRESSION INSPECTION [MZR 2.0, MZR 2.5].) • Is there any malfunction?	Yes	Repair or replace the malfunctioning parts according to the inspection results, then go to the next step.
8		No	Go to the next step.
9	VERIFY DTC TROUBLESHOOTING COMPLETED • Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE [MZR 2.0, MZR 2.5].) • Perform the KOER self test. (See KOEO/KOER SELF TEST [MZR 2.0, MZR 2.5].) • Is the same DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [MZR 2.0, MZR 2.5].) Go to the next step.
9		No	Go to the next step.
10	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [MZR 2.0, MZR 2.5].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZR 2.0, MZR 2.5].)
10		No	DTC troubleshooting completed.