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Engine Brake Supply Circuit
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 388 PID: S079 SPN: 1072 FMI: 11/11 LAMP: Yellow SRT: |
Less than (+) 6 VDC detected at engine brake circuit 1 when on. Indicates an excessive current draw from the ECM or a faulty ECM output circuit. |
Engine brake on cylinder number 1 can |
 Engine Brake Relay Supply Circuit
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Circuit Description
The electronic control module (ECM) enables the engine brake by sending a signal directly to the engine brakes. The ECM will
only enable the engine brakes under certain operating conditions.
Component Location
The engine brakes are located under the valve cover. The 8-pin engine brake connector is located on the intake side of the head above the inlet air horn. The engine brake solenoid for cylinder number 1 is the forward-most of the three engine brake solenoids.
Shop Talk
Possible causes for this fault code include:
- ECM engine brake circuit 1 shorted to ground
- This fault code is
not used when a three-level engine braking harness (ICON™) is installed.
Refer to Troubleshooting Fault Code t05-388.
Last Modified: 26-Oct-2010
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