DTC P2601-777 Coolant Pump Control Circuit Range / Performance: Description
WARNING: This page is about a different car, the 2006 Lexus RX 400h. However, it is still accessible from the selected car via links, so may be relevant.
HINT:
This is the repair procedure for the "oil pump control circuit".
The HV control ECU detects the Generator and Motor temperature through signals from the generator and motor temperature sensors and activates the oil pump relay and oil pump driver (oil pump w/ motor assembly).
The HV control ECU monitors OPST signals from the oil pump driver and detects a malfunction.
DTC DETECTION CONDITION - TROUBLE AREA CHART
| DTC No. | INF No. | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| P2601 | 777 | Command signal (OPM1) from HV control ECU is abnormal |
|
Conditions for the oil pump w/ motor assembly to be activated
The oil pump w/ motor assembly is activated when:
- Generator temperature is 120°C (248°F) or more
- Motor temperature is 130°C (266°F) or more and Generator temperature is 100°C (212°F) or more
HINT:
- In case of the second condition, if the oil pump w/ motor assembly is not activated even though the Generator temperature is 10 °C (212°F) or more, attempt to activate the oil pump w/ motor assembly by changing the Generator temperature to 110 (200), 120 (248), 130 (266), 140 (284) and 150°C (302°F) respectively.
- The oil pump cannot be activated only with the oil pump relay on. It is activated after receiving the command signals (OPM1) from the HV control ECU.