Toyota Tundra Service Manual: Terminals Of Ecu

Toyota Tundra Service Manual / Engine, Hybrid System / Cruise Control / Cruise Control System / Terminals Of Ecu

TERMINALS OF ECU

CHECK ECM (for 1UR-FE)

HINT:

The standard voltage, resistance and waveform between each pair of the ECM terminals is shown in the table below. The appropriate conditions for checking each pair of the terminals is also indicated. The result of checks should be compared with the standard voltage, resistance and waveform for each pair of the terminals as displayed in the Specified Condition column. The illustration above can be used as a reference to identify the ECM terminal locations.

Terminal No. (Symbols)	Wiring Color	Terminal Description	Condition	Specified Condition
D74-27 (D) - D74-81 (E1)	G - BR	D shift position signal	Ignition switch ON, shift lever in D	11 to 14 V
D74-27 (D) - D74-81 (E1)	G - BR	D shift position signal	Ignition switch ON, shift lever not in D	Below 1 V
A24-25 (S) - D74-81 (E1)	Y - BR	S shift position signal	Ignition switch ON, shift lever in S	11 to 14 V
A24-25 (S) - D74-81 (E1)	Y - BR	S shift position signal	Ignition switch ON, shift lever not in S	Below 1 V
A24-36 (STP) - D74-81 (E1)	SB - BR	Stop light switch assembly signal	Brake pedal depressed	11 to 14 V
A24-36 (STP) - D74-81 (E1)	SB - BR	Stop light switch assembly signal	Brake pedal released	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 "-"	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 "+"	Below 1 V
A24-45 (CCS) - D74-81 (E1)	W - BR	Cruise control main switch circuit	Cruise control main switch (ON-OFF button) not pushed	1 MΩ or higher
A24-45 (CCS) - D74-81 (E1)	W - BR	Cruise control main switch circuit	Cruise control main switch (ON-OFF button) pushed	Below 2.5 Ω
A24-45 (CCS) - D74-81 (E1)	W - BR	Cruise control main switch circuit	+RES switch ON	235 to 245 Ω
A24-45 (CCS) - D74-81 (E1)	W - BR	Cruise control main switch circuit	-SET switch ON	617 to 643 Ω
A24-45 (CCS) - D74-81 (E1)	W - BR	Cruise control main switch circuit	CANCEL switch ON	1509 to 1571 Ω
A24-35 (ST1-) - D74-81 (E1)	G - BR	Stop light switch assembly signal	Ignition switch ON, brake pedal depressed	Below 1 V
A24-35 (ST1-) - D74-81 (E1)	G - BR	Stop light switch assembly signal	Ignition switch ON, brake pedal released	11 to 14 V

CHECK ECM (for 3UR-FE)

HINT:

Terminal No. (Symbols)	Wiring Color	Terminal Description	Condition	Specified Condition
D74-49 (D) - D74-81 (E1)	G - BR	D shift position signal	Ignition switch ON, shift lever in D	11 to 14 V
D74-49 (D) - D74-81 (E1)	G - BR	D shift position signal	Ignition switch ON, shift lever not in D	Below 1 V
A24-27 (S) - D74-81 (E1)	Y - BR	S shift position signal	Ignition switch ON, shift lever in S	11 to 14 V
A24-27 (S) - D74-81 (E1)	Y - BR	S shift position signal	Ignition switch ON, shift lever not in S	Below 1 V
A24-7 (STP) - D74-81 (E1)	SB - BR	Stop light switch assembly signal	Brake pedal depressed	11 to 14 V
A24-7 (STP) - D74-81 (E1)	SB - BR	Stop light switch assembly signal	Brake pedal released	Below 1 V
A24-47 (SFTD) - D74-81 (E1)	BE - BR	Down-shift position switch signal	Ignition switch ON, shift lever in S	11 to 14 V
A24-47 (SFTD) - D74-81 (E1)	BE - BR	Down-shift position switch signal	Ignition switch ON, shift lever in "-"	Below 1 V
A24-39 (SFTU) - D74-81 (E1)	G - BR	Up-shift position switch signal	Ignition switch ON, shift lever in S	11 to 14 V
A24-39 (SFTU) - D74-81 (E1)	G - BR	Up-shift position switch signal	Ignition switch ON, shift lever in "+"	Below 1 V
A24-60 (CCS) - A24-59 (ECCS)	W - BR	Cruise control main switch circuit	Cruise control main switch (ON-OFF button) not pushed	1 MΩ or higher
A24-60 (CCS) - A24-59 (ECCS)	W - BR	Cruise control main switch circuit	Cruise control main switch (ON-OFF button) pushed	Below 2.5 Ω
A24-60 (CCS) - A24-59 (ECCS)	W - BR	Cruise control main switch circuit	+RES switch ON	235 to 245 Ω
A24-60 (CCS) - A24-59 (ECCS)	W - BR	Cruise control main switch circuit	-SET switch ON	617 to 643 Ω
A24-60 (CCS) - A24-59 (ECCS)	W - BR	Cruise control main switch circuit	CANCEL switch ON	1509 to 1571 Ω
A24-8 (ST1-) - D74-81 (E1)	G - BR	Stop light switch assembly signal	Ignition switch ON, brake pedal depressed	Below 1 V
A24-8 (ST1-) - D74-81 (E1)	G - BR	Stop light switch assembly signal	Ignition switch ON, brake pedal released	11 to 14 V

System Diagram

Lost Communication With Vehicle Dynamics Control Module (U0122)

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DESCRIPTION There may be a short circuit between the CAN main bus lines and/or CAN branch lines when the resistance between terminals 15 (CA5H) and 16 (CA5L) of the central gateway ECU (network gateway ECU) is below 54 Ω. Symptom Trouble Area Resistance between terminals 15 (CA5H) and 16 (CA5L) of ...

Toyota Tundra Service Manual: Terminals Of Ecu

System Diagram

Lost Communication With Vehicle Dynamics Control Module (U0122)

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