HYBRID CONTROL SYSTEM, Diagnostic DTC:P1555-181, P1556-182

DTC Code DTC Name
P1555-181 Reactor Temperature Sensor Circuit Low
P1556-182 Reactor Temperature Sensor Circuit High

DESCRIPTION

The MG ECU located in the inverter with converter assembly detects the temperature of the reactor using a temperature sensor built into the inverter with converter assembly. The inverter cooling system is the same as that for MG2 and MG1, and it operates independently of the engine cooling system. The MG ECU uses signals from the reactor temperature sensor to check the effectiveness of the inverter cooling system. If necessary, the MG ECU will limit inverter output to help prevent inverter overheating. The MG ECU also detects malfunctions in the reactor temperature sensor and sends failure information to the hybrid vehicle control ECU which sets the following DTCs.

Tech Tips

The reactor is a component with characteristics that resist changes in the current flow. The reactor will attempt to maintain the current flow. This characteristic stabilizes the current flowing to the HV battery. The reactor is also used to boost the HV battery voltage which is supplied to the inverters.

DTC No. INF Code DTC Detection Condition Trouble Area
P1555 181 Short to GND in the reactor temperature sensor circuit Inverter with converter assembly
P1556 182 Open or short to +B in the reactor temperature sensor circuit

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK DTC OUTPUT (HV)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.

    4. Check if DTCs are output.

      Result
      Result Proceed to
      P1555-181 or P1556-182 only is output.

      A

      (for LHD)

      B

      (for RHD)
      Any of the following DTCs are also output. C
      DTC No. Relevant Diagnosis
      P3226-562, 563 DC/DC Boost Converter Temperature Sensor

    B

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here

    C

    GO TO DTC CHART Click here

    A

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here