RX400h · Service Manual HYBRID SYSTEM

P0A1D-139

Diagnostic trouble codes

DESCRIPTION

DTC No.
 INF Code
 DTC Detection Condition
 Trouble Area
P0A1D
 139
 Relay activation IC error
  1. Wire harness or connector
  2. IGCT relay
  3. HV control ECU

MONITOR DESCRIPTION

The HV control ECU performs diagnostic monitoring to verify proper operation of vehicle systems. The inside of the HV control ECU is checked by one of these monitors for a bad integrated circuit which actuates a relay. If the HV control ECU detects a malfunction, it will illuminate the MIL and set a DTC.

WIRING DIAGRAM

Refer to the wiring diagram of P3110-223. (Click here)

INSPECTION PROCEDURE


1. CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - IGCT RELAY)

  1. Disconnect the H34 connector from the HV control ECU.

  1. Remove the IGCT relay from the R/B No.2.

  1. A105209E02
    Measure the voltage according to the value(s) in the table below when the ignition switch is in the ON position.

    NOTICE:
    Turning the ignition switch to the ON position with the HV control ECU connectors disconnected causes other DTCs to be stored. Clear the DTCs after performing the inspection.

    Standard voltage:
    Tester Connection
    		 Specified Condition
    MREL (H31-12) - Body ground
    		 Below 1 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2. INSPECT IGCT RELAY

  1. A032779E01
    Remove the IGCT relay from the engine room R/B No.4.

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

    Standard Resistance:
    Tester Connection
    		 Specified Condition
    3 - 5
    		 10 kΩ or more
    3 - 5
    		 Below 1 Ω
    (when battery voltage is applied to terminals 1 and 2)



NG
REPLACE IGCT RELAY
OK

REPLACE HYBRID VEHICLE CONTROL ECU


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