Meter - Gauge System - Speed Signal Circuit(2009/01 - )

Brand:

Toyota

Model Name:

Camry ACV40 GSV40

Manual:

Repair Manual

Section:

Meter

Title:

Meter - Gauge System

  1. Description

  2. Wiring diagram

  3. Inspection procedure

  4. Inspect combination meter assembly (output waveform)

  5. Inspect ecu terminal voltage (input voltage)

  6. Inspect combination meter assembly (output voltage)

  7. Inspect skid control ecu (input waveform)

  8. Check harness and connector (combination meter - skid control ecu)

  9. Check harness and connector (combination meter - no. 3 junction block)

  10. Check harness and connector (no. 3 junction block)

  11. System check

  12. Check harness and connector (radio receiver circuit)

  13. Check harness and connector (windshield wiper replay circuit)

  14. System check

  15. Check harness and connector (ecm circuit)

  16. Check harness and connector (headlight leveling ecu circuit)

  17. Check harness and connector (tcm circuit)

  18. Check harness and connector (clearance warning ecu circuit)

METER / GAUGE SYSTEM > Speed Signal Circuit


​

DESCRIPTION

The meter CPU receives vehicle speed signals from this circuit. The vehicle speed sensor detects the voltage that varies according to the vehicle speed. The skid control ECU supplies power to the vehicle speed sensor. The skid control ECU detects vehicle speed signals based on the pulses of the voltage. The skid control ECU transmits vehicle speed signals as pulses to the meter CPU. A voltage of 12 V is output from the combination meter assembly and then input to the skid control ECU. The signal is changed to a pulse signal at the transistor in the combination meter assembly.
A voltage of 12 V or 5 V is output from each ECU or relay and then input to the combination meter assembly.
Each ECU controls the respective system based on the pulse signal.
HINT:
This circuit is used for another system, and is not used for combination meter operation.

WIRING DIAGRAM


for 2AZ-FE

Meter - Gauge System - Speed Signal Circuit(2007/12 - 2009/01) Camry


for 2GR-FE

Meter - Gauge System - Speed Signal Circuit(2007/12 - 2009/01) Camry


INSPECTION PROCEDURE

1.INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)
  1. Check the output waveform.Remove the combination meter assembly with connector(s) still connected.Connect the oscilloscope to the terminals F2-12 (+S) and body ground.Turn the ignition switch to the ON position.Turn the wheel slowly.Check the signal waveform according to the condition(s) in the table below.ItemConditionTool setting5 V/DIV., 20 ms./DIV.Vehicle conditionDriving at approx. 20 km/h (12 mph)OK:The waveform is displayed as 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. Camry

  2. Check the output waveform.

    1. Remove the combination meter assembly with connector(s) still connected.

    2. Connect the oscilloscope to the terminals F2-12 (+S) and body ground.

    3. Turn the ignition switch to the ON position.

    4. Turn the wheel slowly.

    5. Check the signal waveform according to the condition(s) in the table below.

      Item
      		Condition
      Tool setting
      		5 V/DIV., 20 ms./DIV.
      Vehicle condition
      		Driving at approx. 20 km/h (12 mph)
      OK:
      The waveform is displayed as 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.


NGnext
Go to step 2
OK
next down
RETURN TO THE ORIGINAL INSPECTION FOR OTHER SYSTEM

2.INSPECT ECU TERMINAL VOLTAGE (INPUT VOLTAGE)
  1. Remove the F2 connector. Camry

  2. Remove the F2 connector.

  1. Measure the voltage according to the value(s) in the table below.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    F2-12 (+S) - Body ground
    		Turn the ignition switch to the ON position
    		4.5 to 14 V
    HINT:
    If any of the ECUs specified in the wiring diagram supplied power to the combination meter, the combination meter will output a waveform.


NGnext
Go to step 6
OK
next down

3.INSPECT COMBINATION METER ASSEMBLY (OUTPUT VOLTAGE)
  1. Remove the A25 (*1)/A26 (*2) connector. Camry

  2. Remove the A25 (*1)/A26 (*2) connector.

  1. Measure the voltage according to the value(s) in the table below.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    A25-23 (SP1) (*1) - Body ground
    		Turn the ignition switch to the ON position
    		10 to 14 V
    A26-12 (SP1) (*2) - Body ground
    		Turn the ignition switch to the ON position
    		10 to 14 V
    *1: without VSC
    *2: with VSC


NGnext
Go to step 5
OK
next down

4.INSPECT SKID CONTROL ECU (INPUT WAVEFORM)
  1. Check the input waveform.Reconnect the A25 (*1)/A26 (*2) connector.Remove the combination meter assembly with connector(s) still connected.Connect the oscilloscope to the terminals F2-14 (SI) and body ground.Turn the ignition switch to the ON position.Turn the wheel slowly.Check the signal waveform according to the condition(s) in the table below.ItemConditionTool setting5 V/DIV., 20 ms./DIV.Vehicle conditionDriving at approx. 20 km/h (12 mph)OK:The waveform is displayed as 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.*1: without VSC*2: with VSC Camry

  2. Check the input waveform.

    1. Reconnect the A25 (*1)/A26 (*2) connector.

    2. Remove the combination meter assembly with connector(s) still connected.

    3. Connect the oscilloscope to the terminals F2-14 (SI) and body ground.

    4. Turn the ignition switch to the ON position.

    5. Turn the wheel slowly.

    6. Check the signal waveform according to the condition(s) in the table below.

      Item
      		Condition
      Tool setting
      		5 V/DIV., 20 ms./DIV.
      Vehicle condition
      		Driving at approx. 20 km/h (12 mph)
      OK:
      The waveform is displayed as shown in the illustration.
      HINT:
      1. 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.
      2. *1: without VSC
      3. *2: with VSC


NGnext
REPLACE SKID CONTROL ECU
OK
next down
REPLACE COMBINATION METER ASSEMBLY

5.CHECK HARNESS AND CONNECTOR (COMBINATION METER - SKID CONTROL ECU)
  1. Disconnect the F2 connector. Camry

  2. Disconnect the F2 connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A25-23 (SP1) (*1) - F2-14 (SI)
    		Always
    		Below 1 Ω
    A25-23 (SP1) (*1) - Body ground
    		Always
    		10 kΩ or higher
    A26-12 (SP1) (*2) - F2-14 (SI)
    		Always
    		Below 1 Ω
    A26-12 (SP1) (*2) - Body ground
    		Always
    		10 kΩ or higher
    *1: without VSC
    *2: with VSC


NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
next down
REPLACE COMBINATION METER ASSEMBLY

6.CHECK HARNESS AND CONNECTOR (COMBINATION METER - NO. 3 JUNCTION BLOCK)

  1. Disconnect the 3P to 3U No. 3 junction block connector.


    Measure the resistance according to the value(s) in the table below.Standard resistance:Tester ConnectionConditionSpecified ConditionF2-12 (+S) - 3P-3AlwaysBelow 1 ΩF2-12 (+S) - Body groundAlways10 kΩ or higher Camry

  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    F2-12 (+S) - 3P-3
    		Always
    		Below 1 Ω
    F2-12 (+S) - Body ground
    		Always
    		10 kΩ or higher


NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
next down

7.CHECK HARNESS AND CONNECTOR (NO. 3 JUNCTION BLOCK)

  1. Inspect for a short in the circuit that connected the No. 3 junction block shown in the wiring diagram.

    HINT:
    If voltage is not present, the circuit (ECU) was possibly the malfunctioning circuit, This is the circuit that will be diagnosed by following the A step that follows.

    1. Disconnect the 3H to 3O and 3A to 3H No. 3 junction block connectors.


      Measure the voltage according to the value(s) in the table below.Standard voltage:Tester ConnectionConditionSpecified Condition3B-10 - Body groundTurn the ignition switch to the ON position4.5 to 14 V3J-9 - Body groundTurn the ignition switch to the ON position4.5 to 14 V Camry

    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage:
      Tester Connection
      		Condition
      		Specified Condition
      3B-10 - Body ground
      		Turn the ignition switch to the ON position
      		4.5 to 14 V
      3J-9 - Body ground
      		Turn the ignition switch to the ON position
      		4.5 to 14 V

    3. Reconnect the 3H to 3O No. 3 junction block connectors.


      Measure the voltage according to the value(s) in the table below.Standard voltage:Tester ConnectionConditionSpecified Condition3T-9 - Body groundTurn the ignition switch to the ON position4.5 to 14 VResult:ResultProceed toVoltage is not present in one circuitAVoltage is present in all the circuit.B Camry

    4. Measure the voltage according to the value(s) in the table below.

      Standard voltage:
      Tester Connection
      		Condition
      		Specified Condition
      3T-9 - Body ground
      		Turn the ignition switch to the ON position
      		4.5 to 14 V

      Result:

      Result
      		Proceed to
      Voltage is not present in one circuit
      		A
      Voltage is present in all the circuit.
      		B


Bnext
REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 3 JUNCTION BLOCK)
A
next down

8.SYSTEM CHECK

  1. Select the circuit in which is not present voltage in step 7.

    Result:
    Tester Connection
    		System that uses the circuit
    		Proceed to
    3T-9 - Body ground
    		Audio/Visual System
    		A
    3J-9 - Body ground
    		Wiper and Washer System
    		B
    3B-10 - Body ground
    		SFI System
    		C
    3B-10 - Body ground
    		Lighting System
    		C
    3B-10 - Body ground
    		Automatic Transaxle System
    		C
    3B-10 - Body ground
    		Toyota Parking Assist-sensor System
    		C


Bnext
Go to step 10

Cnext
Go to step 11
A
next down

9.CHECK HARNESS AND CONNECTOR (RADIO RECEIVER CIRCUIT)
  1. Disconnect the F8 connector. Camry

  2. Disconnect the F8 connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    F8-5 (SPD) - Body ground
    		Always
    		10 kΩ or higher


NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
next down
REPLACE RADIO RECEIVER ASSEMBLY

10.CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER REPLAY CIRCUIT)
  1. Disconnect the E26 connector. Camry

  2. Disconnect the E26 connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E26-19 (SPD) - Body ground
    		Always
    		10 kΩ or higher


NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
next down
REPLACE WINDSHIELD WIPER RELAY

11.SYSTEM CHECK

  1. Select the system in which is not present voltage in step 7.

    Result:
    Tester Connection
    		System that uses the circuit
    		Proceed to
    3B-10 - Body ground
    		SFI System
    		A
    3B-10 - Body ground
    		Lighting System
    		B
    3B-10 - Body ground
    		Automatic Transaxle System
    		C
    3B-10 - Body ground
    		Toyota Parking Assist-sensor System
    		D


Bnext
Go to step 13

Cnext
Go to step 14

Dnext
Go to step 15
A
next down

12.CHECK HARNESS AND CONNECTOR (ECM CIRCUIT)
  1. Disconnect the A24 (*1) or A55 (*2) connector. Camry

  2. Disconnect the A24 (*1) or A55 (*2) connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A24-8 (SPD) (*1) - Body ground
    		Always
    		10 kΩ or higher
    A55-8 (SPD) (*2) - Body ground
    		Always
    		10 kΩ or higher
    *1: for 2AZ-FE, or RHD for 2GR-FE
    *2: LHD for 2GR-FE


NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
next down
REPLACE ECM

13.CHECK HARNESS AND CONNECTOR (HEADLIGHT LEVELING ECU CIRCUIT)
  1. Disconnect the A20 connector. Camry

  2. Disconnect the A20 connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A20-16 (SPDR) - Body ground
    		Always
    		10 kΩ or higher


NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
next down
REPLACE HEADLIGHT LEVELING ECU

14.CHECK HARNESS AND CONNECTOR (TCM CIRCUIT)
  1. Disconnect the C56 connector. Camry

  2. Disconnect the C56 connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    C56-3 (SPD1) - Body ground
    		Always
    		10 kΩ or higher


NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
next down
REPLACE TCM

15.CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU CIRCUIT)
  1. Disconnect the S17 connector. Camry

  2. Disconnect the S17 connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    S17-10 (SPD) - Body ground
    		Always
    		10 kΩ or higher


NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
next down
REPLACE CLEARANCE WARNING ECU