Dtc "C40" (P0505 / P0506 / P0507): Isc Valve Circuit Malfunction - Suzuki GSF1250 Service Manual

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1A-91 Engine General Information and Diagnosis:

DTC "C40" (P0505 / P0506 / P0507): ISC Valve Circuit Malfunction

Detected Condition and Possible Cause

Detected Condition

The circuit voltage of motor drive is

Idle speed is lower than the desired idle

Idle speed is high than the desired idle

Wiring Diagram

Troubleshooting

• Be careful not to disconnect the ISC valve coupler at least 5 seconds after ignition switch is turned

If the ECM coupler is disconnected within 5 seconds after ignition switch is turned to OFF, there is a

possibility of an usual valve being written in 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 the terminal damage or terminal bend.

After repairing the trouble, clear the DTC using SDS tool. Refer to "Use of SDS Diagnosis Reset

Procedures (Page 1A-13)".

ECM coupler (Harness side)

Possible Cause

• ISC valve circuit open or shorted to the ground.

• Air passage clogged.

• ISC valve is fixed.

• ISC valve preset position is incorrect.

• Disconnect ISC valve hose.

• ISC valve is fixed.

• ISC valve preset position is incorrect.

B718H11104022

I718H1110105-03

I718H1110240-01

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