DTC 232

DTC 232 HYBRID BATTERY NEGATIVE CONTACTOR CIRCUIT STUCK CLOSED

CIRCUIT DESCRIPTION

DTC Detection Condition:

The SMRs (System Main Relays) connect and disconnect the high-voltage power supply circuit in accordance with requests from the HV control ECU. To ensure a reliable operation, they consists of a total of three relays (one for the negative side and two for the positive side).

To connect, SMR1 and SMR3 turn ON initially. Then, SMR2 turns ON and SMR1 turns OFF. This process protects the circuit from the high-voltage surge current by allowing the limit current to flow via the resistor. To disconnect, SMR2 and SMR3 turn OFF in that order. The HV control ECU checks that the relays have turned OFF properly.

The HV control ECU monitors the proper operation of the SMRs (CON1, CON2 and CON3) to check for malfunction.

MONITOR DESCRIPTION

Monitor Strategy:

Typical Enabling Conditions:

Typical Malfunction Thresholds:

Component Operating Range:

The HV control ECU monitors the system main relay No. 3, because shutting off the high-voltage system might be impossible if the relay terminal becomes stuck. If the HV control ECU detects that the relay terminal has stuck closed, it illuminates the MIL and sets a DTC.

INSPECTION PROCEDURE

If the information (INF) code is present, replace the system main relay No. 3.

REPLACE SYSTEM MAIN RELAY NO. 3