P2601-777

P310 HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P2601-777: Coolant Pump Control Circuit Range / Performance

DTC P2601-777 - Coolant Pump Control Circuit Range / Performance

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 OPERATION OF OIL PUMP WITH MOTOR ASSEMBLY
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Select the following menu items: Powertrain / Hybrid Control / Active Test / Inspection Mode -2WD Inspection.
(d) Turn the power switch on (READY).

(e) Connect an oscilloscope between the hybrid vehicle control ECU terminals specified in the following table, and measure the waveform.

Result:

D -- CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - OIL PUMP WITH MOTOR ASSEMBLY)
C -- CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - OIL PUMP WITH MOTOR ASSEMBLY)
B -- REPLACE HYBRID VEHICLE CONTROL ECU
A -- REPLACE OIL PUMP WITH MOTOR ASSEMBLY
2. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - OIL PUMP WITH MOTOR ASSEMBLY)
(a) Turn the power switch off.
(b) Disconnect the oil pump with motor assembly connector.
(c) Disconnect connector A43 from the hybrid vehicle control ECU.

(d) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):

Standard resistance (Check for short):

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. CHECK HYBRID VEHICLE CONTROL ECU (OPM1 TERMINAL RESISTANCE CHECK)
(a) Connect the oil pump with motor assembly connector.
(b) Disconnect connector B3 from the hybrid vehicle control ECU.

NG -- REPLACE OIL PUMP WITH MOTOR ASSEMBLY
OK -- REPLACE HYBRID VEHICLE CONTROL ECU
4. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - OIL PUMP WITH MOTOR ASSEMBLY)
(a) Turn the power switch off.
(b) Disconnect the oil pump with motor assembly connector.
(c) Disconnect connector A43 from the hybrid vehicle control ECU.
(d) Turn the power switch on (IG).

(e) Measure the voltage according to the value(s) in the table below.
Standard voltage:

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

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
5. CHECK OIL PUMP WITH MOTOR ASSEMBLY
(a) Turn the power switch off.

(b) 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