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Unswitched Battery Supply Circuit
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 442 PID: P168 SPN: 168 FMI: 0/16 LAMP: Yellow SRT: |
Voltage detected at electronic control module (ECM) power supply pins indicates ECM supply voltage is above the maximum system voltage level. |
None on performance. |
 Unswitched Battery Supply Circuit
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Circuit Description
The ECM receives unswitched battery input through the OEM harness. There is either one in-line 30-amp fuse or two in-line 15-amp fuses in the unswitched battery wire to protect the OEM harness from overheating. The battery return wires are connected directly to the negative (-) battery post.
The ECM receives unswitched battery input through the OEM harness.
Component Location
The ECM is connected to the battery by the OEM harness. This direct link provides a constant power supply for the ECM. The location of the battery will vary with the original equipment manufacturer (OEM). Use the OEM manual for battery location.
Shop Talk
Disconnect all aftermarket devices from the battery supply circuit. Make sure the proper-size fuses are being used (one 30-amp fuse or two 15-amp fuses, depending on the application).
Refer to Troubleshooting Fault Code t05-442
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