1. DTC U023A description
The ECM and stereo camera communicate the control information and diagnosis information via the CAN communication circuit. The ECM monitors the CAN operational status by expecting a constant message flow from each module. If the ECM fails to receive an expected message, the DTC is set.
2. Condition for setting DTC U023A
Condition for running the DTC
- The battery voltage is 8 to 16 V.
- 3 seconds or more have passed since the ignition switch was turned ON.
- DTC U0001 is not set.
Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC U0001 (Flash Code 84) High Speed CAN Communication Bus".
Condition for setting the DTC
- The ECM detects that CAN messages from the stereo camera are not received.
3. Action taken when DTC U023A sets
- Euro4: The ECM illuminates the SVS indicator light. Refer to Action taken when DTC sets - Type C (Euro4).
- Except Euro4: The ECM illuminates the check engine warning light. Refer to Action taken when DTC sets - Type A (Except Euro4).
Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC type definitions".
4. Condition for clearing DTC U023A
- Euro4: Refer to Condition for clearing the SVS indicator light/DTC - Type C (Euro4).
- Except Euro4: Refer to Condition for clearing the check engine warning light/DTC - Type A or Type B (Except Euro4).
Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC type definitions".