Engine General Information and Diagnosis: 1A-80
DTC “C40” (P0505 / P0506 / P0507): ISC Valve Circuit Malfunction
B822H11104022
Detected Condition and Possible Cause
Wiring Diagram
ECM coupler (Harness side)
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-14)”.
Detected Condition
Possible Cause
C40/P0505
H
ISC valve motor current is higher than
the specified value.
• ISC valve circuit shorted to BATT or ground circuit open.
• ISC valve circuit open or shorted to ground or BATT
circuit open.
• W/Y or Lg wire open or short.
• ISC valve is fixed.
• Air circuit clogged.
• W/Y or Dgr wire open or short.
• Disconnected ISC valve hose.
L
ISC valve motor circuit is open.
C40/P0506
Idle speed is lower than the desired
idle speed.
C40/P0507
Idle speed is higher than the desired
idle speed.
ECM
IS1A
36
53
35
52
16
IS1B
IS2A
IS2B
BATT
12 V
ISC valve
Lbl
W
Dgr
R/Bl
Lg
I822H1110081-02
1
2
3
4 5
6 7 8 9 10 11 12 13 14 15 16 17
18
18
18 19 20 21 22 23
26 27
24 25
28 29 30 31 32 33 34
35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
53 54 55 56 57 58 59 60 61 62 63
67
64 65 66
68
68
68
52
52
52
I822H1110010-01
Summary of Contents for VLR1800
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