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Start Enable Device 1 Circuit (Ether Injection) – Voltage Below Normal or Shorted to Low Source
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 2739 PID: S237 SPN: 626 FMI: 4/4 LAMP: Amber SRT: |
Start Enable Device 1 Circuit (Ether Injection) – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at the ether start solenoid circuit. |
Ether start functionality will be disabled. |
 ISX and ISM – Ether Injection 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 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 control 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 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 Codes
The ether injection circuit PWM signal is not detected to be system voltage when the PWM signal is turned ON.
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 by using the 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.
This fault code is logged when the ECM commands 12 VDC to the ether injection solenoid, but the voltage on the ether injection signal circuit is less than 12 VDC. The low voltage on the signal circuit usually indicates a short circuit to ground in the harness or solenoid.
Refer to Troubleshooting Fault Code t05-2739
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