P3110-223

L110 HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P3110-139: IGCT Relay Malfunction

DTC P3110-139 - IGCT Relay Malfunction

DTC P3110-223 - IGCT Relay Malfunction

DESCRIPTION

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

WIRING DIAGRAM

INSPECTION PROCEDURE
CAUTION:
- Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with converter assembly, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.
- After disconnecting the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting, check the voltage at the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.
HINT:
- Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.
- If the battery voltage is applied to terminal +B1, +B2, or MREL of the hybrid vehicle control ECU, even though the power switch is off, the circuit is shorted to +B.

PROCEDURE

1. INSPECT INTEGRATION RELAY (IGCT RELAY)

(a) Remove the integration relay from the engine room R/B No. 1.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPLACE INTEGRATION RELAY
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - ENGINE ROOM R/B NO. 1)
(a) Disconnect the hybrid vehicle control ECU connector.
(b) Remove the integration relay from the engine room R/B No. 1.
(c) Turn the power switch on (IG).
(d) Measure the voltage according to the value(s) in the table below.

NOTE: Turning the power switch on (IG) with the hybrid vehicle control ECU connectors disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

Standard voltage:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE HYBRID VEHICLE CONTROL ECU