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DTC "C40" (P0505 / P0506 / P0507): ISC Valve Circuit Malfunction
Detected Condition and Possible Cause
Detected Condition
The circuit voltage of motor drive is
C40/P0505
unusual.
Idle speed is lower than the desired
idle speed.
C40/P0506
Idle speed is higher than the desired
idle speed.
C40/P0507
Wiring Diagram
Troubleshooting
CAUTION
!
• Be careful not to disconnect the ISC valve 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-13)".
ISC valve
ECM coupler (Harness side)
1
2
3
4
5
6
7
8
9
10
11
12
13
18
19
20
21
22
23
24
25
26
27
28
29
30
Engine General Information and Diagnosis:
• ISC valve circuit open or shorted to the ground.
• Air passage clogged.
• ISC valve is fixed.
• ISC valve Preset position is incorrect.
• Disconnected ISC valve hose.
• ISC valve is fixed.
• ISC valve Preset position is incorrect.
B/Bl
B/R
Dg
B/G
14
15
16
17
35
36
37
31
32
33
34
44
45
46
Possible Cause
ECM
40
IS1B
47
IS1A
38
IS2B
49
IS2A
38
39
40
41
42
43
47
48
49
50
51
52
1A-74
B940H21104021
I940H1110065-04
I940H1110012-03
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