| WARNING | Read service precautions before proceeding with service procedure. See SERVICE PRECAUTIONS . |
| CAUTION | If Engine Control Module (ECM) replacement is instructed in following test, always ensure ECM electrical connectors and ground circuits are okay. If either are defective, repair and repeat testing to confirm ECM malfunction. |
Circuit Description
The Hybrid Vehicle Electronic Control Unit (HV ECU) delivers a vehicle speed signal to the ECM. DTC is set when vehicle speed signal is not received at ECM for 16 seconds or more while vehicle is being driven at 12 MPH or more. Possible causes are
- Defective wiring or electrical connectors.
- Defective HV ECU.
- Defective ECM.
