Circuit DescriptionThe ether injection circuit is a device used by the engine to control the ether injection operation. The ether injection circuit utilizes a Pulse Width Modulated (PWM) signal. A PWM signal is pulsed voltage signal between 0-VDC and system voltage. The frequency of the pulsed voltage signal is dependent on the application requirement.

Component LocationThe control solenoid location varies by OEM. Refer to the appropriate OEM service manual to determine the location.

Conditions for Running the DiagnosticsThis diagnostic runs when the keyswitch is in the ON position and when the pulse width modulated (PWM) device is getting energized or de-energized. In some cases, the diagnostics can also run at some fixed intervals.

Conditions for Setting the Fault CodesThe ether injection circuit pulse width modulated (PWM) signal detected a voltage greater than 0-VDC when the PWM signal was turned off by the ECM.

Action Taken When the Fault Code is ActiveThe ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.The ether injection operation will be disabled.Conditions for Clearing the Fault CodeTo validate the repair, perform a key cycle, and leave the key in the ON position for 1 minute.The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.The Reset All Faults command in INSITE™ electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.

Shop TalkPossible causes of this fault include:

An open circuit in the engine harness or ether injection solenoidA short circuit to voltage source in the OEM harnessA malfunctioning ECM.

Possible Cause:1) Ether injection solenoid failure2) OEM harness3) ECM failure