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Component Tests and General Diagnostics





METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM: Speed Signal Circuit
- Speed Signal Circuit

DESCRIPTION

The vehicle speed signal consists of pulses sent to the combination meter assembly from the master cylinder solenoid (skid control ECU).

WIRING DIAGRAM









INSPECTION PROCEDURE

PROCEDURE

1. CHECK ECU TERMINAL VOLTAGE (INPUT VOLTAGE)

(a) Disconnect the F14 meter connector.





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

Standard Voltage:





Text in Illustration





NG -- CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - NO. 4 JUNCTION BLOCK)
OK -- Continue to next step.

2. CHECK COMBINATION METER ASSEMBLY (OUTPUT VOLTAGE)

(a) Disconnect the A6 master cylinder solenoid (skid control ECU) connector.





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

Standard Voltage:





Text in Illustration





NG -- CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - MASTER CYLINDER SOLENOID)
OK -- Continue to next step.

3. CHECK COMBINATION METER ASSEMBLY (SPEED SIGNAL)

(a) Check the input waveform.





(1) Reconnect the F14 meter connector.

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

(3) Connect an oscilloscope to terminal F14-29 (SI) and body ground.

(4) Turn the ignition switch to ON.

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

Measurement Condition





OK:

The waveform displayed is 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.

NG -- REPLACE MASTER CYLINDER SOLENOID (SKID CONTROL ECU) Disassembly

OK -- REPLACE COMBINATION METER ASSEMBLY Removal

4. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - MASTER CYLINDER SOLENOID)

(a) Disconnect the F14 meter connector.

(b) Disconnect the A6 master cylinder solenoid (skid control ECU ) connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE COMBINATION METER ASSEMBLY Removal

5. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - NO. 4 JUNCTION BLOCK)

(a) Disconnect the F14 meter connector.

(b) Disconnect the 4B junction block connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

6. CHECK HARNESS AND CONNECTOR (NO. 4 JUNCTION BLOCK)

(a) Inspect for a short in the circuit that is connected to the junction block connector shown in the wiring diagram.

HINT
If voltage is not present, it is possible that an ECU or circuit has a malfunction. The malfunctioning ECU or circuit will be diagnosed in the following steps.

(1) Disconnect the 4A junction block connector.





Text in Illustration





(2) Disconnect the 4C junction block connector.

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

Standard Voltage:





*: w/ Tire Pressure Warning System

Result





B -- REPLACE NO. 4 JUNCTION BLOCK
A -- Continue to next step.

7. SYSTEM CHECK

(a) Select the circuit for which voltage was not present in the previous step.

Result





*1: w/ Smart Key System

*2: w/ Safety Connect System

*3: w/ Tire Pressure Warning System

C -- SYSTEM CHECK

B -- CHECK HARNESS AND CONNECTOR (TIRE PRESSURE MONITOR ECU CIRCUIT)
A -- Continue to next step.

8. CHECK HARNESS AND CONNECTOR (NO. 4 JUNCTION BLOCK - NO. 5 JUNCTION BLOCK)

(a) Disconnect the 4C junction block connector.

(b) Disconnect the 5B junction block connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

9. CHECK HARNESS AND CONNECTOR (NO. 5 JUNCTION BLOCK)

(a) Inspect for a short in the circuit that is connected to the junction block connector shown in the wiring diagram.

(1) Disconnect the 5A junction block connector.





Text in Illustration





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

Standard Voltage:





*1: w/ Smart Key System
*2: w/ Safety Connect System

Result





B -- REPLACE NO. 5 JUNCTION BLOCK
A -- Continue to next step.

10. SYSTEM CHECK

(a) Select the circuit for which voltage was not present in the previous step.

Result





*1: w/ Smart Key System

*2: w/ Safety Connect System

D -- CHECK HARNESS AND CONNECTOR (TELEMATICS TRANSCEIVER CIRCUIT)

C -- CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU CIRCUIT)

B -- CHECK HARNESS AND CONNECTOR (VOLTAGE INVERTER ASSEMBLY CIRCUIT)
A -- Continue to next step.

11. CHECK HARNESS AND CONNECTOR (ECM CIRCUIT)

(a) Disconnect the F51*1 or F50*2 ECM connector.

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

Standard Resistance:





*1: for 1GR-FE

*2: for 2TR-FE

Result





C -- REPLACE ECM Removal

B -- REPLACE ECM Removal

A -- REPAIR OR REPLACE HARNESS OR CONNECTOR

12. CHECK HARNESS AND CONNECTOR (VOLTAGE INVERTER ASSEMBLY CIRCUIT)

(a) Disconnect the N19 voltage inverter assembly connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE VOLTAGE INVERTER ASSEMBLY Removal

13. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU CIRCUIT)

(a) Disconnect the F80 power management control ECU connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE POWER MANAGEMENT CONTROL ECU Removal

14. CHECK HARNESS AND CONNECTOR (TELEMATICS TRANSCEIVER CIRCUIT)

(a) Disconnect the F39 telematics transceiver connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE TELEMATICS TRANSCEIVER Removal

15. CHECK HARNESS AND CONNECTOR (TIRE PRESSURE MONITOR ECU CIRCUIT)

(a) Disconnect the F7 tire pressure monitor ECU connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE TIRE PRESSURE MONITOR ECU Removal

16. SYSTEM CHECK

(a) Proceed to the appropriate inspection based on the components of the vehicle.

Component





C -- CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER, STEREO COMPONENT AMPLIFIER CIRCUIT)

B -- CHECK HARNESS AND CONNECTOR (RADIO RECEIVER, STEREO COMPONENT AMPLIFIER CIRCUIT)
A -- Continue to next step.

17. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY CIRCUIT)

(a) Disconnect the G9 radio receiver connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE RADIO RECEIVER ASSEMBLY Removal

18. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER, STEREO COMPONENT AMPLIFIER CIRCUIT)

(a) Disconnect the G9 radio receiver connector.

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





Text in Illustration





Standard Voltage:





NG -- CHECK HARNESS AND CONNECTOR (RADIO RECEIVER, STEREO COMPONENT AMPLIFIER CIRCUIT)

OK -- REPLACE RADIO RECEIVER ASSEMBLY Removal

19. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER, STEREO COMPONENT AMPLIFIER CIRCUIT)

(a) Disconnect the N11 stereo component amplifier connector.

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





Text in Illustration





Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Removal

20. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER, STEREO COMPONENT AMPLIFIER CIRCUIT)

(a) Disconnect the G18 navigation receiver connector.

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





Text in Illustration





Standard Voltage:





NG -- CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER, STEREO COMPONENT AMPLIFIER CIRCUIT)

OK -- REPLACE NAVIGATION RECEIVER ASSEMBLY Removal

21. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER, STEREO COMPONENT AMPLIFIER CIRCUIT)

(a) Disconnect the N11 stereo component amplifier connector.

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





Text in Illustration





Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY CIRCUIT)

OK -- REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Removal
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