Terminals Of Ecu

WARNING: This page is about a different car, the 2008 Toyota Yaris. However, it is still accessible from the selected car via links, so may be relevant.

CHECK COMBINATION METER ASSEMBLY

Using the tester probes, touch the terminals from the back of the vehicle wire harness connectors, and measure the voltages and resistances of each terminal.

Fig 1: Identifying Terminals Of ECU

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard:

CONNECTOR TERMINAL VOLTAGE REFERENCE CHART

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
IG2 (D1-1)-Body ground	B - Body ground	Ignition switch signal	Ignition switch OFF --> ON	Below 1 V --> 11 to 14 V
ECUB (D1-2)-Body ground	L - Body ground	Battery	Always	11 to 14 V
CANH (D1-20)-Body ground	G - Body ground	CAN communication line	Ignition switch ON	Pulse generation
CANL (D1-21)-Body ground	W - Body ground	CAN communication line	Ignition switch ON	Pulse generation
ET (D1-24) - Body ground	BR - Body ground	Ground	Always	Below 1 Ω

CHECK MAIN BODY ECU

Using the tester probes, touch the terminals from the back of the vehicle wire harness connectors, and measure the voltages and resistances of each terminal.

Fig 2: Identifying Main Body ECU Connector Terminal

Standard:

CONNECTOR TERMINAL VOLTAGE SPECIFICATIONS

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
KSW (4D-7) - Body ground	Y - Body ground	Key unlock warning switch input	Key inserted --> Key removed from ignition key cylinder	Below 1 V --> 11 to 14 V
GND1 (4E-17)-Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
BECU (4B-30) - Body ground	L - Body ground	Battery	Always	11 to 14 V
DCTY (4A-21)-Body ground	R - Body ground	Driver door courtesy switch input	Driver door closed --> open	11 to 14 V --> Below 1 V
CANL (D33-22) - Body ground	W - Body ground	CAN communication line	Ignition switch ON	Pulse generation
CANH (D33-23) - Body ground	R - Body ground	CAN communication line	Ignition switch ON	Pulse generation