Toyota Tundra Service Manual: Terminals Of Ecm

Toyota Tundra Service Manual / Engine, Hybrid System / A760e Automatic Transmission / Transaxle / Automatic Transmission System / Terminals Of Ecm

TERMINALS OF ECM

1. CHECK ECM

HINT:

The standard voltage at each ECM terminal is shown in the table below.

In the table, first follow the information under "Condition". Look under "Terminal No. (Symbol)" for the terminals to inspect. The standard voltage between the terminals is shown under "Specified Condition".

Use the illustration above as a reference for the ECM terminals.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
D74-120 (NSW) - D74-81 (E1)	L - BR	PNP switch signal	Ignition switch ON Shift lever in P or N	Below 1 V
D74-120 (NSW) - D74-81 (E1)	L - BR	PNP switch signal	Ignition switch ON Shift lever not in P or N	11 to 14 V
D74-2 (P) - D74-81 (E1)	G-B - BR	P shift position switch signal	Ignition switch ON Shift lever in P	11 to 14 V
D74-2 (P) - D74-81 (E1)	G-B - BR	P shift position switch signal	Ignition switch ON Shift lever not in P	Below 1 V
D74-26 (R) - D74-81 (E1)	L-R - BR	R shift position switch signal	Ignition switch ON Shift lever in R	11 to 14 V
D74-26 (R) - D74-81 (E1)	L-R - BR	R shift position switch signal	Ignition switch ON Shift lever not in R	Below 1 V
D74-25 (N) - D74-81 (E1)	G-W - BR	N shift position switch signal	Ignition switch ON Shift lever in N	11 to 14 V
D74-25 (N) - D74-81 (E1)	G-W - BR	N shift position switch signal	Ignition switch ON Shift lever not in N	Below 1 V
D74-27 (D) - D74-81 (E1)	G - BR	D shift position switch signal	Ignition switch ON Shift lever in D	11 to 14 V
D74-27 (D) - D74-81 (E1)	G - BR	D shift position switch signal	Ignition switch ON Shift lever not in D	Below 1 V
A24-25 (S) - D74-81 (E1)	Y - BR	S shift position switch signal	Ignition switch ON Shift lever in S	11 to 14 V
A24-25 (S) - D74-81 (E1)	Y - BR	S shift position switch signal	Ignition switch ON Shift lever not in S	Below 1 V
A24-38 (SFTU) - D74-81 (E1)	G - BR	Up-shift position switch signal	Ignition switch ON Shift lever in S	11 to 14 V
A24-38 (SFTU) - D74-81 (E1)	G - BR	Up-shift position switch signal	Ignition switch ON Shift lever in "+" (up-shift)	Below 1 V
A24-27 (SFTD) - D74-81 (E1)	BE - BR	Down-shift position switch signal	Ignition switch ON Shift lever in S	11 to 14 V
A24-27 (SFTD) - D74-81 (E1)	BE - BR	Down-shift position switch signal	Ignition switch ON Shift lever in "-" (down-shift)	Below 1 V
D74-7 (S1) - D74-81 (E1)	R - BR	S1 solenoid signal	1st gear	Below 1 V
D74-7 (S1) - D74-81 (E1)	R - BR	S1 solenoid signal	Not in 1st gear	11 to 14 V
D74-6 (S2) - D74-81 (E1)	W - BR	S2 solenoid signal	1st, 2nd or 6th gear	11 to 14 V
D74-6 (S2) - D74-81 (E1)	W - BR	S2 solenoid signal	3rd, 4th or 5th gear	Below 1 V
D74-3 (S3) - D74-81 (E1)	G-W - BR	S3 solenoid signal	1st, 2nd or 3rd gear	11 to 14 V
D74-3 (S3) - D74-81 (E1)	G-W - BR	S3 solenoid signal	4th, 5th or 6th gear	Below 1 V
D74-5 (S4) - D74-81 (E1)	G-R - BR	S4 solenoid signal	5th or 6th gear	11 to 14 V
D74-5 (S4) - D74-81 (E1)	G-R - BR	S4 solenoid signal	1st, 2nd, 3rd or 4th gear	Below 1 V
D74-4 (SR) - D74-81 (E1)	G - BR	SR solenoid signal	1st, 2nd, 3rd or 4th gear	11 to 14 V
D74-4 (SR) - D74-81 (E1)	G - BR	SR solenoid signal	5th or 6th gear	Below 1 V
D74-14 (SL1+) - D74-15 (SL1-)	Y - L	SL1 solenoid signal	5th or 6th gear	Pulse generation
D74-12 (SL2+) - D74-13 (SL2-)	G-R - L-W	SL2 solenoid signal	Engine is idling	Pulse generation
D74-9 (SLT+) - D74-8 (SLT-)	B - G-B	SLT solenoid signal	Engine is idling	Pulse generation
D74-10 (SLU+) - D74-11 (SLU-)	L-Y - L-R	SLU solenoid signal	5th gear (lock-up) or 6th gear (lock-up)	Pulse generation
D74-122 (THO1) - D74-98 (E2)	G-Y - BR	No. 1 ATF temperature sensor signal	No. 1 ATF temperature: 115°C (239°F) or more	Below 1.5 V
D74-99 (THO2) - D74-98 (E2)	L - BR	No. 2 ATF temperature sensor signal	No. 2 ATF temperature: 115°C (239°F) or more	Below 1.5 V
D74-101 (SP2+) - D74-100 (SP2-)	Y - B	Speed sensor SP2 signal	Vehicle speed 20 km/h (12 mph)	Pulse generation (see waveform 1)
D74-124 (NT+) - D74-123 (NT-)	Y - B	Speed sensor NT signal	Engine idling (shift lever in P or N)	Pulse generation (see waveform 2)
A24-10 (CANH) - D74-81 (E1)	GR - BR	CAN communication line	Ignition switch ON	Pulse generation (see waveform 3)
A24-11 (CANL) - D74-81 (E1)	W - BR	CAN communication line	Ignition switch ON	Pulse generation (see waveform 4)

(a) Using an oscilloscope, check waveform 1.

Reference

Terminal No. (Symbol)	Tool Setting	Condition
D74-101 (SP2+) - D74-100 (SP2-)	2 V/DIV., 20 msec./DIV.	Vehicle speed 20 km/h (12 mph)

(b) Using an oscilloscope, check waveform 2.

Reference

Terminal No. (Symbol)	Tool Setting	Condition
D74-124 (NT+) - D74-123 (NT-)	1 V/DIV., 2 msec./DIV.	Engine idling (shift lever in P or N)

Reference

Terminal No. (Symbol)	Tool Setting	Condition
A24-10 (CANH) - D74-81 (E1)	1 V/DIV., 10 μsec./DIV.	Ignition switch ON

(d) Using an oscilloscope, check waveform 4.

Reference

Terminal No. (Symbol)	Tool Setting	Condition
A24-11 (CANL) - D74-81 (E1)	1 V/DIV., 10 μsec./DIV.	Ignition switch ON

System Diagram

Transmission Control Switch Circuit

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Toyota Tundra Service Manual: Terminals Of Ecm

System Diagram

Transmission Control Switch Circuit

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