Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Echo 2000-2002 Approved techinfo.toyota.com ileaf 02toyrm 02toypdf 02rmsour 2002 02echorm di eg cip0505
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DI-106
DIAGNOSTICS - ENGINE
DI6VH-02
DTC P0505 Idle Control System Malfunction
CIRCUIT DESCRIPTION
The rotary solenoid type IAC valve is located on the throttle
Intake Air body and intake air bypassing the throttle valve is directed to
Throttle Valve Chamber the IAC valve through a passage.
In this way the intake air volume bypassing the throttle valve is
From regulated, controlling the engine speed.
Air The ECM operates only the IAC valve to perform idle-up and
Cleaner provide feedback for the target idling speed.
Signal
ECM
Valve To Cylinder
IAC Valve
P01559
DTC No. DTC Detecting Condition Trouble AreaTrouble Area
S IAC valve is stuck or closed
S Open or short in IAC valve circuit
Idle speed continues to vary greatly from the target speed S Open or short in A/C switch circuit
P0505
(2 trip detection logic) S Air induction system
S ECM
S PCV piping
2002 ECHO (RM884U)
Author : Date : 276
DI-107
DIAGNOSTICS - ENGINE
WIRING DIAGRAM
I10 Ignition Instrument Panel J/B
Switch
W-R B-R 6 3
5 AM2 IG2 6 1O 1A
1O 1 ECM
Instrument B-R
Panel J/B
B-Y
1A 7 Engine
Room
W-R R/B No. 1
1 1 1 1
2 2
1 5
AM2 EFI
EFI
1 Relay
1
2 3 I1
1 IAC Valve
B-L 2
1 1 B-R RSD
2 F6 E7
1
Fussible 4
MAIN
B-Y BR
Link Block W-B EB1
B-Y 2 3
EO1
Battery
EC EB
A09138 A18878
2002 ECHO (RM884U)
Author : Date : 277
DI-108
DIAGNOSTICS - ENGINE
INSPECTION PROCEDURE
HINT:
Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool. Because freeze frame records
the engine conditions when the malfunction is detected, when troubleshooting it is useful for determining
whether the vehicle was running or stopped, the engine warmed up or not, the air-fuel ratio lean or rich, etc.
at the time of the malfunction.
1 Check engine idle speed.
PREPARATION:
(a) Warm up engine to normal operating temperature.
(b) Switch off all accessories.
(c) Switch off alr conditioning.
(d) Shift transmission into "N" or neutral position.
(e) Connect the TOYOTA hand-held tester to DLC3 on the vehicle.
(f) Select ACTIVE TEST mode on the TOYOTA hand-held tester.
CHECK:
Make note of the engine RPM before, and 5 seconds after the TOYOTA hand-held tester active test is turned
ON.
OK:
Difference of engine speed: More than 100 rpm.
OK Go to step 7.
NG
2 Check connection of PCV piping.
NG Repair or replace PCV piping.
OK
2002 ECHO (RM884U)
Author : Date : 278
DI-109
DIAGNOSTICS - ENGINE
3 Check voltage between terminals RSD of ECM connector and body ground.
ON RSD PREPARATION:
(a) Remove the connector cover from the ECM.
(b) Disconnect the E7 connector of ECM.
(c) Turn the ignition switch ON.
CHECK:
E7 Measure voltage between terminals RSD of the ECM connector
(+) (-)
and body ground,
OK:
A09042 Voltage: 9 - 14 V
OK Go to step 5.
NG
4 Check IAC valve (See page SF-37 ).
NG Replace IAC valve.
OK
Check for open and short in harness and
connector between engine room J/B No.2
and IAC valve and ECM (See page IN-29 ).
5 Check operation of the IAC valve (See page SF-37 ).
NG Repair or replace IAC valve.
OK
2002 ECHO (RM884U)
Author : Date : 279
DI-1 10
DIAGNOSTICS - ENGINE
6 Check the blockage of IAC valve and the passage to bypass the throttle valve.
NG Repair or replace IAC valve.
OK
Check and replace ECM (See page IN-29 ).
7 Check for A/C signal circuit (See page AC-88 ).
NG Repair or replace.
OK
Check air induction system
(See page SF-1 ).
2002 ECHO (RM884U)
Author : Date : 280
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