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DTC P0505 Idle Control System Malfunction: Circuit Description

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RC Villeda

This document provides diagnostic information for a P0505 DTC code indicating an idle control system malfunction. It describes the idle air control (IAC) valve circuit and signals. Potential trouble areas include a stuck or closed IAC valve, or open/short circuits in the IAC valve or its signal circuit. The provided inspection procedure checks the air intake system, IAC valve signal, voltage supply, and tests/replaces the IAC valve and ECM as needed.

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DTC P0505 Idle Control System Malfunction: Circuit Description

Uploaded by

RC Villeda
68 views3 pages
This document provides diagnostic information for a P0505 DTC code indicating an idle control system malfunction. It describes the idle air control (IAC) valve circuit and signals. Potential trouble areas include a stuck or closed IAC valve, or open/short circuits in the IAC valve or its signal circuit. The provided inspection procedure checks the air intake system, IAC valve signal, voltage supply, and tests/replaces the IAC valve and ECM as needed.

Original Title

2008-07-31_142820_96_corolla

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This document provides diagnostic information for a P0505 DTC code indicating an idle control system malfunction. It describes the idle air control (IAC) valve circuit and signals. Potential trouble areas include a stuck or closed IAC valve, or open/short circuits in the IAC valve or its signal circuit. The provided inspection procedure checks the air intake system, IAC valve signal, voltage supply, and tests/replaces the IAC valve and ECM as needed.

Copyright:

Attribution Non-Commercial (BY-NC)
Download as PDF, TXT or read online from Scribd
Download as pdf or txt
68 views3 pages

DTC P0505 Idle Control System Malfunction: Circuit Description

Uploaded by

RC Villeda
This document provides diagnostic information for a P0505 DTC code indicating an idle control system malfunction. It describes the idle air control (IAC) valve circuit and signals. Potential trouble areas include a stuck or closed IAC valve, or open/short circuits in the IAC valve or its signal circuit. The provided inspection procedure checks the air intake system, IAC valve signal, voltage supply, and tests/replaces the IAC valve and ECM as needed.

Copyright:

Attribution Non-Commercial (BY-NC)
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DI-82

DIAGNOSTICS ENGINE
DI3YF-02

DTC

P0505

Idle Control System Malfunction

CIRCUIT DESCRIPTION
Throttle Valve Intake Air Chamber

From Air Cleaner

The rotary solenoid type IAC valve is located on the throttle body and intake air bypassing the throttle valve is directed to the IAC valve through a passage. In this way the intake air volume bypassing the throttle valve is regulated, controlling the engine speed. The ECM operates only the IAC valve to perform idle-up and provide feedback for the target idling speed.

Signals

ECM IAC Valve Valve To Cylinders

A07562

DTC No..

DTC Detecting Condition

Trouble Area S IAC valve is stuck or closed S Open or short in IAC valve circuit S Open or short in AC1 signal circuit S Air intake (hose loose)

P0505

Idle speed continues to vary greatly from the target speed

WIRING DIAGRAM
ECM IAC Valve 1 J/B No.2 B B-O 2 2F 1 2G 5 EFI 1 EFI Relay 1B 4 J/B No.1 IGN 2E 5 J/B No.2 9 2A
EB

B-L

10 E5

10 RSO E8

Battery Ignition Switch

4 2G 3 2C

2 B-W 9 E5 9 RSC E8

E01 3

(4A-FE) (7A-FE)

E01

15 1G

B-O

W-B

S00608

1996 COROLLA (RM442U)

DI-83
DIAGNOSTICS ENGINE

INSPECTION PROCEDURE
1 Check air induction system (See page SF-1 ).

NG

Repair or replace.

OK

Check A/C signal circuit (See page DI-107 ).

NG

Repair or replace.

OK

Check voltage terminals RSO, RSC.


ON RSO (+) RSC (+)

E5 or E8 connector
A00416

PREPARATION: (a) Turn up the the floor mat on passenger side. (b) Remove the 2 bolts for ECM. (c) Disconnect the E5 or E8 connector of ECM. (d) Turn ignition switch ON. CHECK: Measure voltage between terminals RSO, RSC of ECM connector and body ground. OK: Voltage: 9 - 14 V OK Go to step 5.

NG

1996 COROLLA (RM442U)

DI-84
DIAGNOSTICS ENGINE

Check IAC valve (See page SF-39 ).

NG

Replace IAC valve.

OK

Check for open and short in harness and connector between J/B No.2 and IAC valve, IAC valve and ECM (See page IN-26 ).

Check operation of the IAC valve (See page SF-39 ).

NG

Repair or replace IAC valve.

OK

Check and replace ECM (See page IN-26 ).

1996 COROLLA (RM442U)

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