6-2-156 ENGINE GENERAL INFORMATION AND DIAGNOSIS (M13 ENGINE)
Table B-4 Idle Air Control System Check
Troubleshooting
1. IAC valve 3. Main relay 5. Ignition switch
2. ECM 4. “IG COIL” fuse 6. Relay box
E23-15
E21-28
12V
5V
E21-6
E21-5
BLK/WHT
BLK/RED
BLK/RED
BLK/RED
WHT/BLU
80A
60A 20A
BLK/YEL BLK/YEL
BLK/YEL
BLU/BLK
BLU/BLK
E22-1
E23-2
BLK/YEL
BLK/YEL
BLK
E23-1
E23 E22 E21
12345671234561234567
7
891011121314151617 8910111213141516 891011121314151617
1819
1819
1718192021222324252627 20212223 202122232425 24252627 2627
2829303132 32 282930 28293031 3133 33 323334 3435 3435
E23-8
BLK/RED
BLK/RED
BLK
GRN/YEL
6
5
4
3
1
2
Step Action Yes No
1 Check engine idle speed and IAC duty referring
to “Idle Speed/IAC Duty Inspection” in Section
6E2.
Is idle speed within specification?
Go to Step 2. Go to Step 4.
2 Is IAC duty within specification in Step 1? Go to Step 3. Check for followings:
• Vacuum leak
• EVAP canister purge
control system
• Clog of IAC air passage
• Accessory engine load
•“Table B-6 Electric
Load Signal Circuit
Check” Closed throttle
position (TP sensor)
• Stuck to PCV valve
3 Is engine idle speed kept specified speed even
with headlight ON?
System is in good condi-
tion.
Go to Step 6.
4 Was idle speed higher than specification in
Step 1?
Go to Step 5. Go to Step 6.
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