Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Terminals Of Ecu

TERMINALS OF ECU

1. CHECK COMBINATION METER ASSEMBLY

(a) Measure the resistance and voltage according to the value(s) in the table

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

C9-19 (B) - Body ground

P - Body ground

Battery power supply

Always

11 to 14 V

C9-20 (IG+) - Body ground

BE - Body ground

Ignition switch power supply

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1 V

C9-17 (EP) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

C9-18 (ES) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

C9-1 (CANH) - Body ground

G - Body ground

CAN communication line

Always

200 Ω or higher

C9-2 (CANL) - Body ground

W - Body ground

CAN communication line

Always

200 Ω or higher

  • If the result is not as specified, the combination meter assembly may have a malfunction.

2. CHECK CENTER AIRBAG SENSOR ASSEMBLY

Terminal No.

Terminal Symbol

Destination

A23-12

FSR+

Occupant classification ECU

A23-13

FSR-

Occupant classification ECU

A22-11

LBE+

Front seat inner belt assembly (for driver side)

A22-12

LBE-

Front seat inner belt assembly (for driver side)

3. CHECK OCCUPANT CLASSIFICATION ECU

(a) Measure the voltage and check for pulses according to the value(s) in the

(a) Measure the voltage and check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

O5-1 (+B) - O5-3 (GND)

R - W-B

Battery power supply

Always

11 to 14 V

O5-2 (DIA) - O5-3 (GND)

W - W-B

Diagnosis (DLC3)

Ignition switch ON

Pulse generation

O5-3 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 V

O5-7 (IG) - O5-3 (GND)

BE - W-B

Ignition switch power supply

Ignition switch ON

11 to 14 V

O5-8 (FSR+) - O5-4 (FSR-)

W - B

Center airbag sensor assembly communication line

Ignition switch ON

Pulse generation

O5-9 (BSW) - O5-5 (BGND)

G - P-G

Front passenger side buckle switch line

Always

4 to 14 V

O4-1 (SGD1) - O5-3 (GND)

L - W-B

Front occupant classification sensor LH ground line

Always

Below 1 V

O4-2 (SGD2) - O5-3 (GND)

BE - W-B

Front occupant classification sensor RH ground line

Always

Below 1 V

O4-3 (SGD3) - O5-3 (GND)

P-G - W-B

Rear occupant classification sensor LH ground line

Always

Below 1 V

O4-4 (SGD4) - O5-3 (GND)

B-R - W-B

Rear occupant classification sensor RH ground line

Always

Below 1 V

O4-11 (SVC1) - O4-1 (SGD1)

B-L - L

Front occupant classification sensor LH power supply line

Ignition switch ON, a load applied to front occupant classification sensor LH

4.9 to 5.1 V

O4-12 (SVC2) - O4-2 (SGD2)

LG-B - BE

Front occupant classification sensor RH power supply line

Ignition switch ON, a load applied to front occupant classification sensor RH

4.9 to 5.1 V

O4-5 (SVC3) - O4-3 (SGD3)

B - P-G

Rear occupant classification sensor LH power supply line

Ignition switch ON, a load applied to rear occupant classification sensor LH

4.9 to 5.1 V

O4-6 (SVC4) - O4-4 (SGD4)

GR-L - B-R

Rear occupant classification sensor RH power supply line

Ignition switch ON, a load applied to rear occupant classification sensor RH

4.9 to 5.1 V

O4-7 (SIG1) - O4-1 (SGD1)

G - L

Front occupant classification sensor LH signal line

Ignition switch ON, a load applied to front occupant classification sensor LH

0 to 5.1 V

O4-8 (SIG2) - O4-2 (SGD2)

R-L - BE

Front occupant classification sensor RH signal line

Ignition switch ON, a load applied to front occupant classification sensor RH

0 to 5.1 V

O4-9 (SIG3) - O4-3 (SGD3)

R-B - P-G

Rear occupant classification sensor LH signal line

Ignition switch ON, a load applied to rear occupant classification sensor LH

0 to 5.1 V

O4-10 (SIG4) - O4-4 (SGD4)

L-R - B-R

Rear occupant classification sensor RH signal line

Ignition switch ON, a load applied to rear occupant classification sensor RH

0 to 5.1 V

  • If the result is not as specified, the occupant classification ECU may have a malfunction.
Problem Symptoms Table
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Removal
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Reassembly
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