DTC U0401-00: ABNORMAL MESSAGE FROM PCM [DSC HU/Control Module]: Notes
WARNING: This page is about a different car, the 2021 Mazda CX-5. However, it is still accessible from the selected car via links, so may be relevant.
| DTC |
U0401:00 |
Abnormal message from PCM |
| DETECTION CONDITION |
- Correct data cannot be received from PCM
|
| FAIL-SAFE FUNCTION |
Refer to "DTC Table" and "Fail-safe Function Malfunction Contents". (See DTC TABLE [DSC HU/Control Module] .) |
| POSSIBLE CAUSE |
- DTCs are stored in the PCM
- DTCs are stored in the TCM
- Short to ground or open circuit in backup voltage circuit: VIN Y
- Short to ground in wiring harness between MAIN 200 A fuse and PCM terminal 2O
- MAIN 200 A fuse and/or ENG.+B 7.5 A fuse malfunction
- Open circuit in wiring harness between battery positive terminal and PCM terminal 2O
VIN M
- Short to ground in wiring harness between MAIN 200 A fuse and PCM terminal 2A
- MAIN 200 A fuse and/or ENG.+B 7.5 A fuse malfunction
- Open circuit in wiring harness between battery positive terminal and PCM terminal 2A
- PCM malfunction
- TCM malfunction
|
 Courtesy of MAZDA MOTORS CORP.
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