Terminals Of Ecu

Fig 1: Identifying Terminals Of ECU

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

As the ECM connector is a waterproof connector, it is not possible to check the voltage of each terminal or check the waveform with an oscilloscope while the ECM is installed in the vehicle.

1. Disconnect the A38 and C53 ECM connectors.
2. Measure the voltage and resistance according to the value(s) in the table below.
   CONNECTOR TERMINAL REFERENCE
   
   

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   A38-16 (TC) - Body ground	V-W - Body ground	Terminal TC of DLC3	Engine switch on (IG)	11 to 14 V
   			Engine switch off	Below 1 V
   C53-81 (E1) - Body ground	W-B - Body ground	ECM ground	Always	Below 1 Ω
   C53-27 (D) - Body ground	G - Body ground	Park/neutral position switch signal	Engine switch on (IG) Shift lever in D	11 to 14 V
   			Engine switch on (IG) Shift lever not in D	Below 1 V
   A38-38 (SFTU) - Body ground	Y - Body ground	Park/neutral position switch signal	Engine switch on (IG) Shift lever in S	Below 1 Ω
   			Engine switch on (IG) Shift lever in +	10 kΩ or higher
   A38-25 (S) - Body ground	W - Body ground	Park/neutral position switch signal	Engine switch on (IG) Shift lever in S	11 to 14 V
   			Engine switch on (IG) Shift lever not in S	Below 1 V
   A38-27 (SFTD) - Body ground	L - Body ground	Park/neutral position switch signal	Engine switch on (IG) Shift lever in S	10 kΩ or higher
   			Engine switch on (IG) Shift lever in -	Below 1 Ω
   A38-36 (STP) - Body ground	R - Body ground	Stop light signal	Engine switch on (IG) Brake pedal depressed	11 to 14 V
   			Engine switch on (IG) Brake pedal released	Below 1 V
   A38-35 (ST1-) - Body ground	R-W - Body ground	Stop light signal (opposite to STP terminal)	Engine switch on (IG) Brake pedal depressed	Below 1 V
   			Engine switch on (IG) Brake pedal released	11 to 14 V
   A38-45 (CCS) - Body ground	L - Body ground	Cruise control main switch signal	Engine switch on (IG) Main switch off	1 MΩ or higher
   			Engine switch on (IG) CANCEL switch held on	1510 to 1570 Ω
   			Engine switch on (IG) -SET switch held on	620 to 640 Ω
   			Engine switch on (IG) +RES switch held on	235 to 245 Ω
   			Engine switch on (IG) Main switch on	Below 2.5 Ω

   If the result is not as specified, there may be a malfunction on the wire harness side.