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Unswitched Battery Supply Circuit
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Overview
CODE | REASON | EFFECT |
Fault Code: 341 PID: S253 SPN: 630 FMI: 2/2 LAMP: Amber SRT: |
Engine control module (ECM) data lost. |
Possibly no noticeable performance effects, engine dying, or difficulty in starting the engine. Fault information, trip information, and maintenance monitor data can be inaccurate. |
![]() Unswitched Battery Supply Circuit
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Circuit Description
The ECM receives constant voltage at the 4-pin power connector from the batteries through the unswitched battery wires that are connected directly to the positive (+) battery post. The ECM receives switched battery input through the vehicle keyswitch wire, in the 50-pin OEM ECM connector, when the vehicle keyswitch is turned on. Pins 2 and 3 are optional circuits the OEM may not use. Refer to the OEM wiring diagram for detailed information on these circuits.
Component Location
The ECM is connected to the battery by the ECM power harness. This direct link provides a constant power supply for the ECM. The location of the battery will vary with the OEM. Refer to the OEM troubleshooting and repair manual.
Refer to Troubleshooting Fault Code t05-341