4-60 FI SYSTEM DIAGNOSIS
DTC “C40” (P0505): ISC VALVE CIRCUIT MALFUNCTION
DETECTED CONDITION AND POSSIBLE CAUSE
WIRING DIAGRAM
TROUBLESHOOTING
NOTE:
After repairing the trouble, clear the DTC using SDS tool. (
4-25)
DETECTED CONDITION
POSSIBLE CAUSE
The circuit voltage of motor drive is unusual.
ISC valve circuit open or shorted to ground.
* Be careful not to disconnect the ISC valve coupler at least 5 seconds after ignition switch is
turned to OFF.
If the ECM coupler or ISC valve coupler is disconnected within 5 seconds after ignition switch
is turned to OFF, there is a possibility of an unusual value being written in the ECM and caus-
ing 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-point tester probe to prevent terminal damage.
ECM
ISC. 1A
ISC. 1B
ISC. 2A
ISC. 2B
ISC valve
Lbl
B/R
W/R
W/B
15 16 17 18 19
22 23
20 21
24 25 26
2 3 4 5 6
9 10
7 8
11 12 13
27 28 29 30 31 32 33 34 35
36 37 38 39 40 41 42 43 44
1
14
ECM coupler (Harness side)
Содержание GW250
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