DTC P26F4-31: Coolant Pump "C" Control Circuit No Signal [09/2023 - ]: Description
WARNING: This page is about a different car, the 2024 Lexus TX 500h. However, it is still accessible from the selected car via links, so may be relevant.
The rear motor generator control ECU (MGR ECU) detects the rear motor (MGR) temperature based on signals from the rear motor temperature sensors and activates the OIL PMP relay and oil pump driver (rear oil pump with motor assembly).
The rear motor generator control ECU (MGR ECU) monitors RNOP signals from the oil pump driver and detects malfunctions.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Warning Indicate | DTC Output from | Priority | Note |
|---|---|---|---|---|---|---|---|---|
| P26F4-31 | Coolant Pump "C" Control Circuit No Signal | When the OIL PMP relay is on, the RNOP pulse signal is not output. (2 trip detection logic) |
|
Does not come on | Master Warning: Comes on |
Motor Generator | A | SAE Code: P26F4 |
HINT:
The rear oil pump with motor assembly cannot be activated only with the OIL PMP relay on. It is activated after receiving the command signals (ROPM) from the rear Motor generator control ECU (MGR ECU).