P2511

L110 HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P2511-149: ECM/PCM Power Relay Sense Circuit Intermittent

DTC P2511-149 - ECM/PCM Power Relay Sense Circuit Intermittent

DESCRIPTION

The hybrid vehicle control ECU monitors the +B power source voltage to detect an instantaneous interruption.






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.

PROCEDURE

1. CHECK BATTERY TERMINAL
(a) Check the connection of the auxiliary battery terminal.
Result:
The terminal is connected securely and there is no contact problem.
NG -- CONNECT SECURELY
OK -- Continue to next step.
2. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)




(a) Check the connections of the hybrid vehicle control ECU connectors.
Result:
The connectors are connected securely and there are no contact problems.
NG -- CONNECT SECURELY
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - INTEGRATION 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 -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. CHECK FOR INTERMITTENT PROBLEMS
(a) Check for intermittent problems. L110 Hybrid Vehicle Control System
(1) Check the connection and terminal contact pressure of connectors and wire harnesses between the hybrid vehicle control ECU and the engine room R/B No. 1.
(2) When the power switch is on (READY), jiggle the connectors and wire harnesses between the hybrid vehicle control ECU and the engine room R/B No. 1.
NG -- REPAIR MALFUNCTIONING PARTS, COMPONENT AND AREA
OK -- REPLACE HYBRID VEHICLE CONTROL ECU