Speed Signal Circuit [11/2022 - 11/2023]: Procedure

1. Disconnect the I4 combination meter assembly connector.
2. Measure the voltage according to the value(s) in the table below.
   NOTE:

   • Make sure to perform this inspection with the wheels stopped.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   I4-8 (+S) - Body ground	Ignition switch ON	4.5 to 14 V

3. Connect the I4 combination meter assembly connector.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  13

Result: 

OK 

See step  2

1. Connect the combination meter assembly connector.
2. Check the signal waveform according to the condition(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Combination Meter Assembly)
   *b	Waveform

   Item	Condition
   Tester connection	I4-25 (SI) - Body ground
   Tool setting	5 V/DIV., 20 ms./DIV.
   Condition	Ignition switch ON, wheel being rotated

   OK

   The waveform is similar to that shown in the illustration.

   HINT: 

   When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.

   Result

   Result	Proceed to
   The measured waveform is similar to that in the illustration	A
   The measured waveform is not similar to that in the illustration (Stuck low)	B
   The measured waveform is not similar to that in the illustration (Stuck high)	C

Result: 

A 

REPLACE COMBINATION METER ASSEMBLY 

Refer to REMOVAL [11/2022 - 11/2023]

Result: 

C 

See step  9

Result: 

B 

See step  3

1. Choose the model to be inspected.

   Result

   Result	Proceed to
   w/ Smart Key System	A
   w/o Smart Key System	B

Result: 

B 

See step  7

Result: 

A 

See step  4

1. Check if smart key system (for start function) DTCs are output.

   Body Electrical > Power Source Control > Trouble Codes 

   Result

   Result	Proceed to
   DTCs are not output (for Gasoline Model)	A
   DTCs are not output (for HEV Model)	B
   DTCs are output	C

Result: 

B 

GO TO SMART KEY SYSTEM (FOR START FUNCTION) 

Refer to DIAGNOSTIC TROUBLE CODE CHART [11/2022 - ]

Result: 

C 

GO TO SMART KEY SYSTEM (FOR START FUNCTION) 

Refer to DIAGNOSTIC TROUBLE CODE CHART [11/2022 - 11/2023]

Result: 

A 

See step  5

1. Disconnect the I222 certification ECU (smart key ECU assembly) connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   I222-28 (SPDO) - Body ground	Ignition switch off	10 kΩ or higher

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Certification ECU (Smart Key ECU Assembly))

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 

Refer to REMOVAL [11/2022 - ]

Result: 

NG 

See step  6

1. Disconnect the I4 combination meter assembly connector.
2. Disconnect the I222 certification ECU (smart key ECU assembly) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   I222-28 (SPDO) or I4-25 (SI) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE COMBINATION METER ASSEMBLY 

Refer to REMOVAL [11/2022 - 11/2023]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the skid control ECU (brake actuator assembly) connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A151-33 (SP1) - Body ground	Ignition switch off	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) 

Refer to REMOVAL [11/2022 - ]

Result: 

NG 

See step  8

1. Disconnect the I4 combination meter assembly connector.
2. Disconnect the A151 skid control ECU (brake actuator assembly) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A151-33 (SP1) or I4-25 (SI) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE COMBINATION METER ASSEMBLY 

Refer to REMOVAL [11/2022 - 11/2023]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Choose the model to be inspected.

   Result

   Result	Proceed to
   w/ Smart Key System	A
   w/o Smart Key System	B

Result: 

B 

See step  12

Result: 

A 

See step  10

1. Check if smart key system (for start function) DTCs are output.

   Body Electrical > Power Source Control > Trouble Codes 

   Result

   Result	Proceed to
   DTCs are not output (for Gasoline Model)	A
   DTCs are not output (for HEV Model)	B
   DTCs are output	C

Result: 

B 

GO TO SMART KEY SYSTEM (FOR START FUNCTION) 

Refer to DIAGNOSTIC TROUBLE CODE CHART [11/2022 - ]

Result: 

C 

GO TO SMART KEY SYSTEM (FOR START FUNCTION) 

Refer to DIAGNOSTIC TROUBLE CODE CHART [11/2022 - 11/2023]

Result: 

A 

See step  11

1. Disconnect the I222 certification ECU (smart key ECU assembly) connector.
2. Disconnect the I4 combination meter assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   I222-28 (SPDO) - I4-25 (SI)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 

Refer to REMOVAL [11/2022 - ]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Disconnect the A151 skid control ECU (brake actuator assembly) connector.
2. Disconnect the I4 combination meter assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A151-33 (SP1) - I4-25 (SI)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) 

Refer to REMOVAL [11/2022 - ]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Disconnect the A47 ECM connector.*1
   1. *1: for Gasoline Model
2. Disconnect the I55 radio and display receiver assembly connector.
3. Disconnect the I234 stereo component amplifier assembly connector.*1
   1. *1: w/ Stereo Component Amplifier
4. Disconnect the I4 combination meter assembly connector.
5. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A47-42 (SPD) - I4-8 (+S)*1	Always	Below 1 Ω
   I55-8 (SPD) - I4-8 (+S)	Always	Below 1 Ω
   I234-11 (SPD) - I4-8 (+S)*2	Always	Below 1 Ω
   A47-42 (SPD)*1, I55-8 (SPD), I234-11 (SPD)*2 or I4-8 (+S) - Body ground	Always	10 kΩ or higher

   1. *1: for Gasoline Model
   2. *2: w/ Stereo Component Amplifier

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE DEFECTIVE ECU 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR