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Idle Air Control System Check
System / Wiring Diagram
9
8
7
6
21
20
19
18
31
30
29
Troubleshooting
Step
1
Engine idle speed and IAC duty check
1) Check idle speed / idle air control duty referring to "Idle
Speed / Idle Air Control (IAC) Duty Inspection".
Is idle speed within specification?
2
Is IAC duty within specification in Step 1?
3
Is engine idle speed kept specified speed even with
headlight ON?
3
GRN/RED
1
C41 (31P)
5
4
3
2
1
7
6
5
17
16
15
14
13
12
11
10
16
15
14
28 27
26
25
24
23
22
24
23
22
1. IAC valve
2. Main relay
Action
Engine General Information and Diagnosis:
GRY/RED
G03-6
C41-6
G04-5
G04-6
G04-10
BLK/RED
BRN/WHT
BLK/RED
G04 (24P)
G03 (17P)
4
3
2
1
6
5
4
3
2
12
11
10
9
8
13 12
11
10
9
8
21
20
19
18
17
17
16
15
14
3. To TCM
Go to Step 2.
Go to Step 3.
If vehicle with power
steering system, go to
Step 4.
If vehicle without power
steering system, system
is in good condition.
ECM
2
BLK/YEL
1
7
13
Yes
Go to Step 4.
Check for the
followings: Vacuum
leak, EVAP canister
purge control system,
Clog of IAC air passage,
Accessory engine load,
Closed throttle position
(TP sensor), Stuck of
PCV valve.
Check electric load
signal circuit referring to
"Electric Load Signal
Circuit Check".
If check result is OK,
check IAC system for
operation referring to
Step 3 or Step 4 of "DTC
P0505: Idle Control
System Malfunction".
1A-126
S3RH0A1104069
I2RH0B110083-01
No
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