Toyota Tundra Service Manual: Terminals Of Ecu

TERMINALS OF ECU

1. CHECK CLEARANCE WARNING ECU ASSEMBLY

(a) Disconnect the J35 clearance warning ECU assembly connector.

(b) Measure the resistance and voltage according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

J35-11 (IG) - J35-16 (E)

BE - W-B

Power source (IG)

Ignition switch ON, back sonar or clearance sonar switch assembly OFF

Below 1 V

Ignition switch ON, back sonar or clearance sonar switch assembly ON

11 to 14 V

J35-16 (E) - Body ground

W-B - Body ground

ECU ground

Always

Below 1 Ω

(c) Reconnect the J35 clearance warning ECU assembly connector.

(d) Measure the resistance, voltage and pulse according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

J35-2 (ER) - J35-16 (E)

V - W-B

Clearance warning buzzer

Ignition switch ON, back sonar or clearance sonar switch assembly ON, shift lever in R and sensor is detecting state (buzzer sounding)

Pulse generation (See waveform 1)

Buzzer not sounding

11 to 14 V

J35-3 (BOF) - J35-16 (E)

R - W-B

Ultrasonic sensor power source

Ignition switch ON, back sonar or clearance sonar switch assembly ON

7.2 to 8.8 V

J35-4 (E5) - J35-16 (E)

G - W-B

ECU ground

Always

Below 1 Ω

J35-5 (SOF) - J35-4 (E5)

L - G

Front sensor communication signal

Ignition switch ON, back sonar or clearance sonar switch assembly ON, shift lever not in R

Pulse generation (See waveform 3)

J35-6 (PL) - J35-16 (E)

B - W-B

Parking position signal

Ignition switch ON, shift lever not in P

Below 1.5 V

Ignition switch ON, shift lever in P

7 V or higher

J35-7 (L1) - J35-16 (E)

G - W-B

Rear corner ultrasonic sensor RH

Clearance warning indicator LED for rear corner sensor RH illuminates

Below 3 V

J35-8 (L2) - J35-16 (E)

GR - W-B

Rear corner ultrasonic sensor LH

Clearance warning indicator LED for rear corner sensor RH illuminates

Below 3 V

J35-9 (L4) - J35-16 (E)

W - W-B

Front corner ultrasonic sensor RH

Clearance warning indicator LED for front corner sensor RH illuminates

Below 3 V

J35-10 (L10) - J35-16 (E)

R - W-B

Clearance warning ECU signal

Clearance warning indicator's operation indicator illuminates

Below 3 V

J35-12 (BOR) - J35-16 (E)

P - W-B

Ultrasonic sensor power source

Ignition switch ON, back sonar or clearance sonar switch assembly ON

7.2 to 8.8 V

J35-13 (E1) - J35-16 (E)

GR - W-B

ECU ground

Always

Below 1 Ω

J35-14 (SOR) - J35-13 (E1)

LG - GR

Rear sensor communication signal

Ignition switch ON, back sonar or clearance sonar switch assembly ON, shift lever in R

Pulse generation (See waveform 2)

J35-17 (SPD) - J35-16 (E)

V - W-B

Vehicle speed signal

Ignition switch ON, drive wheels are turned slowly

Alternating between 1.5 to 4.5 V

J35-21 (RL) - J35-16 (E)

W - W-B

Reverse position signal

Ignition switch ON, shift lever not in R

Below 1.5 V

Ignition switch ON, shift lever in R

7 V or higher

J35-23 (L3) - J35-16 (E)

SB - W-B

Rear center ultrasonic sensor

Clearance warning indicator LED for rear center sensor illuminates

Below 3 V

J35-24 (L5) - J35-16 (E)

LG - W-B

Front corner ultrasonic sensor LH

Clearance warning indicator LED for front corner sensor LH illuminates

Below 3 V

(e) Using an oscilloscope, check waveform 1.

Measurement Condition

Item

Content

Terminal No. (Symbol)

J35-2 (ER) - J35-16 (E)

Tool Setting

2 V/DIV., 200 μsec./DIV.

Condition

Ignition switch ON, back sonar or clearance sonar switch assembly ON, shift lever in R and sensor is detecting state (buzzer sounding)

(f) Using an oscilloscope, check waveform 2.

Measurement Condition

Item

Content

Terminal No. (Symbol)

J35-14 (SOR) - J35-13 (E1)

Tool Setting

2 V/DIV., 200 μsec./DIV.

Condition

Ignition switch ON, back sonar or clearance sonar switch assembly ON, shift lever in R

(g) Using an oscilloscope, check waveform 3.

Measurement Condition

Item

Content

Terminal No. (Symbol)

J35-5 (SOF) - J35-4 (E5)

Tool Setting

2 V/DIV., 200 μsec./DIV.

Condition

Ignition switch ON, back sonar or clearance sonar switch assembly ON, shift lever not in R

    System Diagram

    Vehicle Speed Signal Circuit

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