P2602

P310 HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P2602-767: Coolant Pump Control Circuit Low

DTC P2602-767 - Coolant Pump Control Circuit Low

DESCRIPTION
HINT: Although the DTC title refers to "coolant pump", this DTC is related to the oil pump control circuit.

The hybrid vehicle control ECU detects the MG1 and MG2 temperature based on signals from the generator and motor temperature sensors and activates the OIL PMP relay and oil pump driver (oil pump with motor assembly).
The hybrid vehicle control ECU monitors OPST signals from the oil pump driver and detects malfunctions.

The oil pump with motor assembly is activated when:
1. MG1 temperature is 248°F (120°C) or more
2. MG2 temperature is 266°F (130°C) or more and the MG1 temperature is 212°F (100°C) or more
HINT:
- If the second condition occurs, and the oil pump with motor assembly does not activate even though the MG1 temperature is 212°F (100°C) or more, the hybrid vehicle control ECU will attempt to activate it when the MG1 temperature changes to 230°F (110°C), 248°F (120°C), 266°F (130°C), 284°F (140°C) and 302°F (150°C) respectively.
- The oil pump cannot be activated only with the OIL PMP relay on. It is activated after receiving the command signals (OPM1) from the hybrid vehicle control ECU.







WIRING DIAGRAM






INSPECTION PROCEDURE
NOTICE:
- When troubleshooting the oil pump with motor assembly, check for the following conditions:

- ATF temperature inside the oil cooler is 41°F (5°C) or more.
- The ambient temperature sensor value is 41°F (5°C) or more.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - OIL PUMP WITH MOTOR ASSEMBLY)
(a) Disconnect connector A43 from the hybrid vehicle control ECU.
(b) Disconnect the oil pump with motor assembly connector.





(c) 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.
2. CHECK OIL PUMP WITH MOTOR ASSEMBLY





(a) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPLACE OIL PUMP WITH MOTOR ASSEMBLY
OK -- REPLACE HYBRID VEHICLE CONTROL ECU