ENGINE GENERAL INFORMATION AND DIAGNOSIS (M13 ENGINE) 6-2-157
5 Check A/C (input) signal circuit referring to Step
1 of “Table B-5 A/C Signal Circuit Check”, if
equipped.
Is it in good condition?
Go to Step 6. Repair or replace A/C sig-
nal circuit or A/C system.
6 Check Idle Air Control system.
1) Remove IAC valve from throttle body refer-
ring to “IAC Valve Removal and Installation”
in Section 6E2.
2) Check IAC valve for operation referring to
“IAC Valve Inspection” in Section 6E2. See
Fig. 1.
Is check result satisfactory?
Intermittent trouble or
faulty ECM.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection” in Section 0A.
Go to Step 7.
7 Check Wire Harness for Open or Short.
1) Turn ignition switch OFF.
2) Disconnect IAC valve connector.
3) Check for proper connection to IAC valve at
each terminals.
4) If OK, disconnect connectors from ECM.
5) Check for proper connection to ECM at
“E23-28” terminal.
6) If OK, check “BLK/RED” and “GRN/YEL” cir-
cuit for open or short.
Are they in good condition?
Replace IAC valve and
recheck.
Repair or replace.
Step Action Yes No
[A]: Fig. 1 for Step 6
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