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Start Enable Device 1 Circuit (Ether Injection) – Voltage Above Normal or Shorted to High Source
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 2738 PID: S237 SPN: 626 FMI: 3/3 LAMP: Amber SRT: |
Start Enable Device 1 Circuit (Ether Injection) – Voltage Above Normal or Shorted to High Source. High signal voltage or open circuit detected at the ether start solenoid circuit. |
Ether start functionality will be disabled. |
 ISX and ISM – Ether Injection Start Circuit
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Circuit Description
The 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 a pulsed voltage signal between 0 VDC and system voltage. The frequency of the pulsed voltage signal is dependent on the application requirement.
Component Location
The ether injection solenoid location varies by OEM. Refer to the appropriate OEM troubleshooting and repair manual to determine the location.
Conditions for Running the Diagnostics
This diagnostic runs when the keyswitch is in the ON position and when the PWM device is activated. In some cases the diagnostic can also run at some fixed intervals.
Conditions for Setting the Fault Codes
The ether injection circuit PWM signal is detected to be greater than 0-VDC when the PWM signal is turned off by the ECM.
Action Taken When the Fault Code is Active
- The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
- The ether injection operation will be disabled.
Conditions for Clearing the Fault Code
The ECM will turn off the amber CHECK ENGINE light and the fault code state will become inactive immediately after the diagnostic runs and passes. The fault code can also be cleared using INSITE™ electronic service tool.
Shop Talk
Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM. Refer to Procedure 019-032 (ECM Calibration Code) in Section 19 in the corresponding Troubleshooting and Repair Manual for the engine being serviced.
Possible causes of this fault include:
- An open circuit in the engine harness or ether injection solenoid.
- A short circuit to voltage source in the OEM harness.
- A malfunctioning ECM.
Refer to Troubleshooting Fault Code t05-2738
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