RX400h · Service Manual HYBRID SYSTEM

P3237-769

Diagnostic trouble codes

DESCRIPTION

The battery thermometer sensor detects the battery temperature. With this signal, the HV control ECU reduces the charge current when the battery temperature is high to protect the battery.
DTC No.
 INF Code
 DTC Detection Condition
 Trouble Area
P3237
 769
 GND short in battery thermometer sensor signal circuit
  1. Battery thermometer sensor
  2. Wire harness or connector
  3. HV control ECU
P3238
 770
 Open or +B short in battery thermometer sensor signal circuit
  1. Battery thermometer sensor
  2. Wire harness or connector
  3. HV control ECU

WIRING DIAGRAM

A113960E02

INSPECTION PROCEDURE

HINT:
Use the intelligent tester to read the freeze frame data and information. Part of the engine running conditions at the time of the malfunction is recorded as freeze frame data and information. This information is useful when troubleshooting the malfunction. (Engine speed, engine load, engine coolant temperature, engine output demand value, ambient temperature, auxiliary battery voltage, intake air temperature, elapsed time after turning the ignition switch on, and other information)


1. INSPECT BATTERY THERMOMETER SENSOR

  1. Resistance check

    1. A108543E02
      Measure the resistance according to the value(s) in the table below.

      Standard Resistance:
      Tester Connection
      		 Specified Condition
      1 - 2
      		 1.91 to 2.05 kΩ
      at 24 to 26°C ( 75 to 79°F)

      HINT:
      The auxiliary battery must be removed to inspect the battery thermometer sensor. Record DTCs, freeze frame data, and other information before removing the auxiliary battery.



 NG
REPLACE BATTERY THERMOMETER SENSOR
OK


2. CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - BATTERY THERMOMETER SENSOR)

  1. A108016E02
    Turn the ignition switch off.

  1. Disconnect the H29 and H34 connectors from the HV control ECU.

  1. Disconnect the B17 battery thermometer sensor connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance (Check for open):
    Tester Connection
    		 Specified Condition
    THB (H29-30) - THB (B17-1)
    		 Below 1 Ω
    E2 (H34-28) - E2 (B17-2)
    		 Below 1 Ω

    Standard Resistance (Check for short):
    Tester Connection
    		 Specified Condition
    THB (H29-30) - THB (B17-1) - Body ground
    		 10 kΩ or higher
    E2 (H34-28) - E2 (B17-2) - Body ground
    		 10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE HYBRID VEHICLE CONTROL ECU


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