DTC U2303 (Flash Code 182) Immobilizer Unknown Signal Received (RZ4E-TC)

1. DTC U2303 description

The ECM communicates with the wireless access module and performs the immobilizer function. The ECM sends a request signal to the wireless access module. The ECM receives a response signal from the wireless access module. Both communication signals are sent and received via the CAN communication circuit. If the ECM receives a signal, which is outside the specifications, from the wireless access module, the DTC is set.

Diagnostic type list
Diagnostics (Type 1)	Models with radar sensors/stereo cameras
Diagnostics (Type 2)	Models without radar sensors and stereo cameras

2. Condition for setting DTC U2303

Condition for setting the DTC

The ECM receives a signal, which is outside the specifications, from the wireless access module.

3. Action taken when DTC U2303 sets

Euro4: The ECM does not illuminate the MIL or SVS indicator light. Refer to Action taken when DTC sets - Type D (Euro4).
Except Euro4: The ECM does not illuminate the check engine warning light. Refer to Action taken when DTC sets - Type D (Except Euro4).

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC type definitions".

The ECM inhibits engine startup.

4. Condition for clearing DTC U2303

Refer to Condition for clearing the DTC - Type D.

Refer to "51.Engine Control 1A.Troubleshooting(RZ4E-TC) DTC type definitions".