Power Supply Circuit Test
When the ignition switch is placed in the "ACC" or "ON" position, power is supplied to the ECU through the rear brake control relay. If there is an open in the power supply circuit, the warning light will come on when the ignition is turned on. To determine correct power supply to the ECU, perform checks as described in the POWER SUPPLY CIRCUIT VOLTAGE SPECIFICATIONS (ECU TERMINAL NO . 11) table.
POWER SUPPLY CIRCUIT VOLTAGE SPECIFICATIONS (ECU TERMINAL NO. 11)
| Application | Voltage |
|---|---|
| Ignition "ON" or "ACC" | Battery Voltage |
| Ignition "OFF" | Zero |
| Ignition "ST | Zero |