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 or MG1, and operates independently of the engine cooling system. The MG ECU limits the load based on signals sent from the reactor temperature sensor in order to check the effect of the inverter cooling system and prevent overheating. The ECU also detects malfunctions in the reactor temperature sensor.

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 battery voltage which is supplied to the inverters.

DTC No. INF Code DTC Detection Condition Trouble Area
P1555 181 Malfunction in the reactor temperature sensor wiring (short to GND) Inverter with converter assembly
P1556 182 Malfunction in the reactor temperature sensor wiring (open or short to +B)

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK DTC OUTPUT (HYBRID CONTROL)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

    4. Check if DTCs are output.

      Result
      Result Proceed to
      Only P1555-181 or P1556-182 is output, or DTCs other than the ones in the table below are also output. A
      Any of the following DTCs are also output. B
      DTC No. Relevant Diagnosis
      P0C39-626 DC/DC Converter Temperature Sensor "A" Range / Performance
      P0C3C-625 DC/DC Converter Temperature Sensor "A" Intermittent / Erratic
      P0C3E-628 DC/DC Converter Temperature Sensor "B" Range / Performance
      P0C41-627 DC/DC Converter Temperature Sensor "B" Intermittent / Erratic

      Tech Tips

      P1555-181 or P1556-182 may be output due to a malfunction which causes the DTCs in the table above to be output. In this case, first troubleshoot the output DTCs in the table above. Then, perform a reproduction test to check that no DTCs are output.

    5. Turn the power switch off.


    B

    GO TO DTC CHART (HYBRID CONTROL SYSTEM) Click here

    A

    REFER TO REPLACE INVERTER WITH CONVERTER ASSEMBLY PARTS Click here