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) |
| Does not come on | Master Warning Light: Comes on |
WIRING DIAGRAM
Refer to the wiring diagram for DTC P2511-149.
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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.
- Turn the power switch on (IG) and wait for 15 seconds or more.
- 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:
|
|
(c) Install the IGCT relay.
| NG | .gif) | REPLACE IGCT RELAY (IGCT) |
|
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| 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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