Lexus ES: Terminals Of Ecm

A28-1 (BATT) - A28-10 (E1)

G - W-B

Battery (for measuring battery voltage and for ECM memory)

Always

11 to 14 V

A28-8 (CANH) - A28-10 (E1)

B - W-B

CAN communication line

Engine switch on (IG)

Pulse generation

A28-9 (+B) - A28-10 (E1)

L - W-B

Power source of ECM

Engine switch on (IG)

11 to 14 V

A28-10 (E1) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

A28-12 (PWMS) - A28-10 (E1)

LG - W-B

Combination switch (S) signal

Engine switch on (IG) and combination switch assembly knob turned and held at S position

Below 1.5 V

Engine switch on (IG) and combination switch assembly knob not turned to S position

11 to 14 V

A28-13 (SPCN) - A28-10 (E1)

P - W-B

Combination switch (Normal) signal

Engine switch on (IG) and Normal mode switch pushed and held

Below 1.5 V

Engine switch on (IG) and Normal mode switch not pushed

11 to 14 V

A28-14 (S) - A28-10 (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

A28-18 (CANL) - A28-10 (E1)

W - W-B

CAN communication line

Engine switch on (IG)

Pulse generation

A28-19 (SFTD) - A28-10 (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

A28-19 (SFTD) - A28-28 (ECCS)

W - BE

Down-shift switch signal

Engine switch on (IG)

11 to 14 V

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

Below 1 V

A28-20 (SFTU) - A28-10 (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

A28-20 (SFTU) - A28-28 (ECCS)

G - BE

Up-shift switch signal

Engine switch on (IG)

11 to 14 V

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

Below 1 V

A28-21 (STP) - A28-10 (E1)

SB - W-B

Stop light switch signal

Brake pedal depressed

7.5 to 14 V

Brake pedal released

Below 1 V

A28-23 (NSW) - A28-10 (E1)

BE - 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

A28-30 (STA) - A28-10 (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

A28-35 (+B2) - A28-10 (E1)

L - W-B

Power source of ECM

Engine switch on (IG)

11 to 14 V

A28-42 (SPD) - A28-10 (E1)

L - W-B

Vehicle speed signal from combination meter assembly

Driving at 20 km/h (12 mph)

Pulse generation

C78-2 (SL6+) - C78-1 (SL6-)

B - L

Solenoid (SL6) valve signal

1st or Reverse gear selected

Pulse generation

C78-4 (SL3+) - C78-3 (SL3-)

G - R

Solenoid (SL3) valve signal

3rd, 7th or Reverse gear selected

Pulse generation

C78-6 (SL2+) - C78-5 (SL2-)

R - GR

Solenoid (SL2) valve signal

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

Pulse generation

C78-8 (SL1+) - C78-7 (SL1-)

LG - L

Solenoid (SL1) valve signal

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

Pulse generation

C78-10 (SLT+) - C78-9 (SLT-)

GR - LG

Solenoid (SLT) valve signal

Engine idling

Pulse generation

C78-12 (SLU+) - C78-11 (SLU-)

LG - V

Solenoid (SLU) valve signal

Lock-up ON

Pulse generation

C78-14 (SL5+) - C78-13 (SL5-)

V - P

Solenoid (SL5) valve signal

2nd or 8th gear selected

Pulse generation

C78-16 (SL4+) - C78-15 (SL4-)

G - B

Solenoid (SL4) valve signal

4th or 6th gear selected

Pulse generation

C78-19 (SL) - A28-10 (E1)

P - W-B

Solenoid (SL) valve signal

11 to 14 V

C78-23 (D) - A28-10 (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

C78-24 (N) - A28-10 (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

C78-25 (R) - A28-10 (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

C78-26 (P) - A28-10 (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

C78-33 (NCB) - A28-10 (E1)

B - W-B

Power source for sensor

(specific voltage)

Engine switch on (IG)

11 to 14 V

C78-34 (NCO) - A28-10 (E1)

V - W-B

Transmission Revolution Sensor (NC) signal

Vehicle being driven

Pulse generation

C78-35 (NTB) - A28-10 (E1)

R - W-B

Power source for sensor

(specific voltage)

Engine switch on (IG)

11 to 14 V

C78-36 (NTO) - A28-10 (E1)

G - W-B

Transmission Revolution Sensor (NT) signal

Engine idling (shift lever in P or N)

Pulse generation

C78-46 (THO1) - C78-45 (ETHO)

LG - L

ATF temperature sensor signal

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

Below 1.5 V