SPN 1188 - FMI 3 (Fault Code 465)

SPN1188 FMI3
Turbocharger 1 Wastegate Control Circuit - Voltage Above Normal or Shorted to High Source

Wastegate Actuator

Fault Code: 465
PID(P), SID(S): S32
SPN: 1188
FMI: 3/3
Lamp: Amber

REASON: High voltage detected at the wastegate actuator number 1 circuit.

EFFECT: Engine power derate.

Circuit Description:
The wastegate actuators are devices used by the Engine Control Module(ECM) to control boost pressure.

Component Location:
The wastegate controller is located on the air inlet horn.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.

Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected the wastegate actuator circuit voltage was out of range high.

Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.

Conditions for Clearing the Fault Code:
• To validate the repair, perform a key cycle, start the engine and let it idle for 1 minute.
• Use the recommended Cummins® electronic service tool or equivalent to verify the fault code is inactive.
• The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
• The “Reset All Faults” command in the recommended Cummins® electronic service tool or equivalent can be used to clear active and inactive faults.

Shop Talk:
Possible cause of this fault code:
• Open circuit in the engine harness, connectors, or actuator.
• Signal circuit shorted to voltage source.

Read More:
SPN 94 - FMI 18 (Fault Code 482)
SPN 1188 - FMI 4 (Fault Code 466)


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