Toyota Avalon Service & Repair Manual: Terminals Of Ecm

TERMINALS OF ECM

ECM

HINT:

The standard voltage and resistance of 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 be inspected. The standard voltage or resistance 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

A18-1 (BATT) - C56-53 (E1)

R - W-B

Battery (for measuring battery voltage and for ECM memory)

Always

11 to 14 V

A18-2 (+B) - C56-53 (E1)

L - W-B

Power source of ECM

Engine switch on (IG)

11 to 14 V

A18-3 (+B2) - C56-53 (E1)

L - W-B

Power source of ECM

Engine switch on (IG)

11 to 14 V

A18-8 (+BM) - C56-53 (E1)

G - W-B

Power source of ECM

Always

11 to 14 V

A18-13 (CANH) - C56-53 (E1)

B - W-B

CAN communication line

Engine switch on (IG)

Pulse generation

A18-17 (S) - C56-53 (E1)

GR - W-B

S shift position switch signal

Engine switch on (IG) and shift lever in S

11 to 14 V

Engine switch on (IG) and shift lever not in S

Below 1 V

A18-26 (CANL) - C56-53 (E1)

W - W-B

CAN communication line

Engine switch on (IG)

Pulse generation

A18-27 (STP) - C56-53 (E1)

SB - W-B

Stop light switch signal

Brake pedal depressed

7.5 to 14 V

Brake pedal released

Below 1 V

A18-37 (SFTD) - C56-53 (E1)

W - W-B

Down-shift switch signal

Engine switch on (IG)

11 to 14 V

Engine switch on (IG) and shift lever held in "-" (Down shift)

Below 1 V

Engine switch on (IG) and "-" (Down shift) shift paddle switch operated

Below 1 V

A18-38 (SFTU) - C56-53 (E1)

G - W-B

Up-shift switch signal

Engine switch on (IG)

11 to 14 V

Engine switch on (IG) and shift lever held in "+" (Up shift)

Below 1 V

Engine switch on (IG) and "+" (Up shift) shift paddle switch operated

Below 1 V

A18-39 (SPD) - C56-53 (E1)

L - W-B

Vehicle speed signal from combination meter assembly

Driving at 20 km/h (12 mph)

Pulse generation

A18-40 (SPCN) - C56-53 (E1)

V - W-B

Combination switch (NORMAL) signal

Engine switch on (IG) and combination switch (NORMAL) being pushed and held

Below 1.5 V

Engine switch on (IG) and combination switch (NORMAL) not pushed

11 to 14 V

A18-43 (STA) - C56-53 (E1)

G - W-B

Starter signal

Cranking (shift lever in P or N, engine switch on (START))

11 to 14 V

Engine switch on (IG) and shift lever in P or N

Below 2 V

A18-55 (PWMS) - C56-53 (E1)

LG - W-B

Combination switch (SPORT) signal

Engine switch on (IG) and combination switch (SPORT) being pushed and held

Below 1.5 V

Engine switch on (IG) and combination switch (SPORT) not pushed

11 to 14 V

C56-6 (SL3+) - C56-7 (SL3-)

L - R

Solenoid (SL3) valve signal

3rd, 7th or Reverse gear

Pulse generation

C56-10 (SL5+) - C56-11 (SL5-)

W - R

Solenoid (SL5) valve signal

2nd or 8th gear

Pulse generation

C56-12 (SL1+) - C56-13 (SL1-)

G - BR

Solenoid (SL1) valve signal

1st, 2nd, 3rd, 4th or 5th gear

Pulse generation

C56-14 (SL4+) - C56-15 (SL4-)

LG - R

Solenoid (SL4) valve signal

4th or 6th gear

Pulse generation

C56-31 (SL2+) - C56-1 (SL2-)

LG - P

Solenoid (SL2) valve signal

5th, 6th, 7th or 8th gear

Pulse generation

C56-32 (SL6+) - C56-33 (SL6-)

GR - LG

Solenoid (SL6) valve signal

1st or Reverse gear

Pulse generation

C56-53 (E1) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

C56-62 (SL) - C56-53 (E1)

W - W-B

Solenoid (SL) valve signal

  • Shift lever in P, R or N
  • Lock-up OFF (shift lever in D)

11 to 14 V

C56-67 (SLT+) - C56-37 (SLT-)

G - B

Solenoid (SLT) valve signal

Engine idling

Pulse generation

C56-72 (NCO) - C56-53 (E1)

L - W-B

Transmission Revolution Sensor (NC) signal

Vehicle being driven

Pulse generation

C56-73 (NCB) - C56-53 (E1)

G - W-B

Power source for sensor

(specific voltage)

Engine switch on (IG)

11 to 14 V

C56-74 (NTO) - C56-53 (E1)

B - W-B

Transmission Revolution Sensor (NT) signal

Engine idling (shift lever in P or N)

Pulse generation

C56-75 (NTB) - C56-53 (E1)

R - W-B

Power source for sensor

(specific voltage)

Engine switch on (IG)

11 to 14 V

C56-76 (SLU+) - C56-61 (SLU-)

L - B

Solenoid (SLU) valve signal

Lock-up ON

Pulse generation

C56-86 (THO1) - C56-133 (ETHW)

W - BR

ATF temperature sensor signal

ATF temperature 115°C (239°F) or higher

Below 1.5 V

C56-106 (NSW) - C56-53 (E1)

R - W-B

Park/neutral position switch signal

Engine switch on (IG) and shift lever in P or N

Below 1 V

Engine switch on (IG) and shift lever not in P or N

11 to 14 V

C56-107 (R) - C56-53 (E1)

W - W-B

R shift position switch signal

Engine switch on (IG) and shift lever in R

11 to 14 V

Engine switch on (IG) and shift lever not in R

Below 1 V

C56-108 (P) - C56-53 (E1)

B - W-B

P shift position switch signal

Engine switch on (IG) and shift lever in P

11 to 14 V

Engine switch on (IG) and shift lever not in P

Below 1 V

C56-139 (D) - C56-53 (E1)

R - W-B

D shift position switch signal

Engine switch on (IG) and shift lever in D or S

11 to 14 V

Engine switch on (IG) and shift lever not in D or S

Below 1 V

C56-140 (N) - C56-53 (E1)

LG - W-B

N shift position switch signal

Engine switch on (IG) and shift lever in N

11 to 14 V

Engine switch on (IG) and shift lever not in N

Below 1 V

    System Diagram

    Transmission Control Switch Circuit

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