1A-91 Engine General Information and Diagnosis:
DTC “C40” (P0505 / P0506 / P0507): ISC Valve Circuit Malfunction
B944H11104022
Detected Condition and Possible Cause
Troubleshooting
CAUTION
!
• Be careful not to disconnect the STVA lead wire coupler at least 5 seconds after ignition switch is
turned to OFF.
If the ECM coupler is disconnected within 5 seconds after ignition switch is turned to OFF, there is a
possibility of an unusual valve being written in the ECM and causing an error of ISC valve operation.
• When using the multi-circuit tester, do not strongly touch the terminal of the ECM coupler with a
needle pointed tester probe to prevent terminal damage.
NOTE
After repairing the trouble, clear the DTC using SDS tool. Refer to “Use of SDS Diagnosis Reset
Procedures (Page 1A-15)”.
Detected Condition
Possible Cause
C40/P0505 ISC valve circuit malfunction.
• Secondary throttle valve is fixed in opening position.
• Defective ECM.
C40/P0506
Idle speed is lower than the desired
idle speed.
C40/P0507
Idle speed is higher than the desired
idle speed.
Step
Action
Yes
No
1
1) Start the engine.
2) Check the engine idling speed.
NOTE
Make sure there is no crack or disconnection in
the IAP sensor hoses and intake pipe.
Is engine idling speed normal?
Go to Step 3.
Go to Step 2.
2
1) Stop the engine.
2) Replace the ECM with a known good one. Refer to
“ECM Removal and Installation in Section 1C (Page 1C-
1)”.
3) Start the engine.
4) Check the engine idling speed again.
Is engine idling speed normal?
Replace the ECM with a
new one. Refer to “ECM
Removal and
Installation in Section
1C (Page 1C-1)”.
Go to Step 3.
3
1) Stop the engine.
2) Remove the air cleaner box. Refer to “Air Cleaner Box
Removal and Installation in Section 1D (Page 1D-6)”.
3) Confirm the throttle valve closed position.
4) Turn the ignition switch ON.
5) Check the secondary throttle valve operation.
Is the operation OK?
Replace the ECM with a
new one. Refer to “ECM
Removal and
Installation in Section
1C (Page 1C-1)”.
Replace the throttle
body assembly with a
new one. Refer to
“Throttle Body Removal
and Installation in
Section 1D (Page 1D-
10)”.
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