Lexus NX: HV Main Relay (P3110-223)

DESCRIPTION

The hybrid vehicle control ECU monitors the IGCT relay and detects the following malfunction.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P3110-223

HV Main Relay

IGCT relay stuck on (+B short):

IGCT relay is stuck on or a short to B+ exists. Power to the hybrid vehicle control ECU does not shut down when the power switch is turned off.

(1 trip detection logic)

  • Wire harness or connector
  • IGCT relay
  • Hybrid vehicle control ECU

Does not come on

Master Warning Light:

Comes on

WIRING DIAGRAM

Refer to the wiring diagram for DTC P2511-149.

Click here

CAUTION / NOTICE / HINT

HINT:

  • If auxiliary battery voltage is applied to the +B1 or +B2 terminal in the hybrid vehicle control ECU even when the power switch is turned off, a short to B+ exists.
  • After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.
    1. Turn the power switch on (IG) and wait for 15 seconds or more.
    2. Turn the power switch off and wait for 30 seconds or more.

PROCEDURE

1.

INSPECT IGCT RELAY (IGCT)

(a) Remove the IGCT relay from the No. 1 engine room relay block.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3 - 5

Auxiliary battery voltage not applied between terminals 1 and 2

10 kΩ or higher

*1

IGCT Relay

(c) Install the IGCT relay.

NG

REPLACE IGCT RELAY (IGCT)

OK

2.

CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - NO. 1 ENGINE ROOM RELAY BLOCK)

(a) Disconnect the A60 and A61 hybrid vehicle control ECU connectors.

(b) Remove the IGCT relay from the No. 1 engine room relay block.

(c) Measure the voltage according to the value(s) in the table below.

*1

No. 1 Engine Room Relay Block

*2

IGCT Relay

*a

Rear view of wire harness connector

(to Hybrid Vehicle Control ECU)

-

-

Standard Voltage:

Tester Connection

Condition

Specified Condition

A61-4 (+B1), A60-1 (+B2) or 5 (IGCT relay) - Body ground

Power switch off

Below 1 V

(d) Install the IGCT relay.

(e) Reconnect the A60 and A61 hybrid vehicle control ECU connectors.

OK

REPLACE HYBRID VEHICLE CONTROL ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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