Meter Gauge Display. Meter / Gauge System Speed Signal Circuit

The combination meter receives the vehicle speed signal from this circuit. The wheel speed sensors produce an output that varies according to the vehicle speed. The wheel speed sensor output is received by the skid control ECU which uses this information to create the vehicle speed sensor signal*. The vehicle speed sensor signal consists of pulses sent to the combination meter from the skid control ECU. To create this signal, 12 V is output from IG2 which is behind a resistor in the combination meter. This voltage is sent to the skid control ECU. The pulse signal is created by switching the transistor in the skid control ECU on and off, making the voltage on the wire drop to 0 V. A similar system is used for the output of this signal from the combination meter via terminal +S. A voltage of 12 V or 5 V is applied to terminal +S from each ECU or relay that is connected to this terminal. The transistor in the combination meter is controlled by the signal from the skid control ECU. When this transistor is turned on, this transistor makes the voltage supplied by the various ECUs (via their respective internal resistors) drop to 0 V. Each ECU connected to terminal +S of the combination meter controls its respective system based on the pulse signal.

*: This vehicle speed sensor signal is created by the skid control ECU. There is no actual component that is referred to as the vehicle speed sensor. In addition, for some other systems, vehicle speed information may be exchanged using CAN communication.

HINT:

This circuit is used for the systems connected to terminal +S. This signal is not used for combination meter operation. Combination meter components such as the speedometer operate using data received via CAN communication.

WIRING DIAGRAM

except TMC Made 2ZR-FE

Corolla. Zre142 Aze141.Meter Gauge Display.Meter / Gauge System.Meter / Gauge System Speed Signal Circuit

for TMC Made 2ZR-FE

except TMC Made 2AZ-FE

INSPECTION PROCEDURE

1.INSPECT ECU TERMINAL VOLTAGE (INPUT VOLTAGE)

Disconnect the E46 connector.

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Condition
Specified Condition
E46-36 (+S) - Body ground
Ignition switch ON
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.
Result:
Result
Proceed to
OK
A
NG (for TMC Made)
B
NG (except for TMC Made)
C

Go to step 5

Go to step 12

A

2.INSPECT COMBINATION METER (OUTPUT VOLTAGE)

Reconnect the E46 connector.

Disconnect the A51*1 or A66*2 connector.

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Condition
Specified Condition
A51-22 (SP1)*1 - Body ground
Ignition switch ON
11 to 14 V
A66-11 (SP1)*2 - Body ground
Ignition switch ON
11 to 14 V
1. *1: w/o VSC
2. *2: w/ VSC

Go to step 4

OK

3.INSPECT SKID CONTROL ECU (INPUT WAVEFORM)

Check the input waveform.
1. Reconnect the A51*1 or A66*2 connector.
  1. *1: w/o VSC
  2. *2: w/ VSC
2. Remove the combination meter with the connector(s) still connected.
3. Connect the oscilloscope to terminals E46-35 (SI) and body ground.
4. Turn the ignition switch to ON.
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 approximately 12 mph (20 km/h)
  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.
  Result:
  Result
  Proceed to
  OK
  A
  NG (w/o VSC)
  B
  NG (w/ VSC)
  C

REPLACE SKID CONTROL ECU (w/o VSC) (COROLLA_ZRE142 RM0000013P6022X.html)

REPLACE SKID CONTROL ECU (w/ VSC) (COROLLA_ZRE142 RM000003CZU00MX.html)

REPLACE COMBINATION METER (COROLLA_ZRE142 RM0000024D7032X_01_0010.html)

4.CHECK HARNESS AND CONNECTOR (COMBINATION METER - SKID CONTROL ECU)

Disconnect the E46 connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A51-22 (SP1)*1 - E46-35 (SI)	Always	Below 1 Ω
A51-22 (SP1)*1 - Body ground	Always	10 kΩ or higher
A66-11 (SP1)*2 - E46-35 (SI)	Always	Below 1 Ω
A66-11 (SP1)*2 - Body ground	Always	10 kΩ or higher

*1: w/o VSC
*2: w/ VSC

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE COMBINATION METER (COROLLA_ZRE142 RM0000024D7032X_01_0010.html)

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

Disconnect the 4C connector.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
E46-36 (+S) - 4C-13
Always
Below 1 Ω
4C-13 - Body ground
Always
10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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

Inspect for a short in the circuit that is connected to the combination meter 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 4A connector.
2. Measure the voltage according to the value(s) in the table below.
  Standard Voltage:
  Tester Connection
  Condition
  Specified Condition
  4A-87*1 - Body ground
  Ignition switch ON
  4.5 to 14 V
  4A-38 - Body ground
  Ignition switch ON
  4.5 to 14 V
  4A-37 - Body ground
  Ignition switch ON
  4.5 to 14 V
  1. *1: w/ Tire Pressure Warning System
3. Reconnect 4A connector.
4. Disconnect 4C connector.
5. Measure the voltage according to the value(s) in the table below.
  Standard Voltage:
  Tester Connection
  Condition
  Specified Condition
  4C-1*2 - Body ground
  Ignition switch ON
  4.5 to 14 V
  1. *2: for Navigation Receiver Type
  Result:
  
  Result
  Proceed to
  Voltage is not present in one circuit.
  A
  Voltage is present in all the circuits.
  B

REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 4 JUNCTION BLOCK)

OK

7.SYSTEM CHECK

Select the circuit that did not present the voltage in the step 6.

Result:

Tester Connection	System that uses the circuit	Proceed to
4A-87*1 - Body ground	Tire pressure warning System	A
4A-38 - Body ground	SFI System	B
4C-1*2 - Body ground	Navigation System	C
4A-37 - Body ground	Audio/visual System*2	D
4A-37 - Body ground	Audio/visual System*3	E

*1: w/ Tire Pressure Warning System
*2: for Navigation Receiver Type
*3: for Radio Receiver Type
*4: for Radio and Display Receiver Type

Go to step 9

Go to step 10

Go to step 11

A

8.CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU CIRCUIT)

Reconnect the E94 connector.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
E94-2 (SPD) - Body ground
Always
10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE TIRE PRESSURE WARNING ECU (COROLLA_ZRE142 RM0000024T8027X.html)

9.CHECK HARNESS AND CONNECTOR (ECM CIRCUIT)

Reconnect the A50 connector.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
A50-38 (SPD) - Body ground
Always
10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE ECM (for 2ZR-FE) (COROLLA_ZRE142 RM000001CN0030X.html)

10.CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY CIRCUIT)

HINT:

If the vehicle does not equipped with the navigation system, proceed to the next step.

Reconnect the E117 connector.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
E117-3 (SPD) - Body ground
Always
10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE NAVIGATION RECEIVER ASSEMBLY (COROLLA_ZRE142 RM000002XAJ01FX.html)

11.CHECK HARNESS AND CONNECTOR (RADIO RECEIVER CIRCUIT, RADIO AND DISPLAY RECEIVER CIRCUIT)

Reconnect the E26*1 or E114*2 connector.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
E26-3 (SPD)*1 - Body ground
Always
10 kΩ or higher
E114-17 (SPD)*2 - Body ground
Always
10 kΩ or higher
E129-17 (SPD)*3 - Body ground
Always
10 kΩ or higher
1. *1: for Radio Receiver Type (w/o USB Audio System)
2. *2: for Radio Receiver Type (w/ USB Audio System)
3. *3: for Radio and Display Type
Result:
Result
Proceed to
OK (for Radio Receiver Type)
A
OK (for Radio and Display Type)
B
NG
C

REPLACE RADIO AND DISPLAY RECEIVER (COROLLA_ZRE142 RM000002XAJ01EX.html)

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE RADIO RECEIVER (COROLLA_ZRE142 RM000002XAJ01EX.html)

12.CHECK HARNESS AND CONNECTOR

Inspect for a short in the circuit that is connected to the combination meter shown in the wiring diagram.
HINT:
If voltage is not present, the circuit (ECU) was possibly the malfunctioning circuit.
1. Disconnect the E26*1 or E114*2, E94*3, E129*4 and 2E connectors.
  1. *1: for Radio Receiver Type (w/o USB Audio System)
  2. *2: for Radio Receiver Type (w/ USB Audio System)
  3. *3: w/ Tire Pressure Warning System
  4. *4: for Radio and Display Type
2. Measure the resistance according to the value(s) in the table below.
  Standard Resistance:
  Tester Connection
  Condition
  Specified Condition
  E46-36 (+S) - Body ground
  Always
  10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

13.INSPECT RADIO RECEIVER (CHECK FOR A SHORT)

HINT:

If the vehicle does not equipped with the radio receiver, proceed to the next step.

Reconnect the E26*1 or E114*2 connector.

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Condition
Specified Condition
E26-3 (SPD)*1 - Body ground
Ignition switch ON
4.5 to 14 V
E114-17 (SPD)*2 - Body ground
Ignition switch ON
4.5 to 14 V
1. *1: w/o USB Audio System
2. *2: w/ USB Audio System

REPLACE RADIO RECEIVER (COROLLA_ZRE142 RM000002XAJ01EX.html)

OK

14.INSPECT TIRE PRESSURE WARNING ECU (CHECK FOR A SHORT)

HINT:

If the vehicle does not equipped with the tire pressure warning system, proceed to the next step.

Reconnect the E94 connector.

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Condition
Specified Condition
E94-2 (SPD)* - Body ground
Ignition switch ON
4.5 to 14 V

*: w/ Tire Pressure Warning System

REPLACE TIRE PRESSURE WARNING ECU (COROLLA_ZRE142 RM0000024T8027X.html)

OK

15.INSPECT RADIO AND DISPLAY RECEIVER (CHECK FOR A SHORT)

HINT:

If the vehicle does not equipped with the radio and display receiver, proceed to the next step.

Reconnect the E129 connector.

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Condition
Specified Condition
E129-17 (SPD) - Body ground
Ignition switch ON
4.5 to 14 V

REPLACE RADIO AND DISPLAY RECEIVER (COROLLA_ZRE142 RM000002XAJ01EX.html)

OK

16.CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK)

Inspect for a short in the circuit that is connected to the combination meter 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 2C, 2D, and 2E connector.
2. Measure the voltage according to the value(s) in the table below.
  Standard Voltage:
  Tester Connection
  Condition
  Specified Condition
  2C-8*2 - Body ground
  Ignition switch ON
  4.5 to 14 V
  2D-8 - Body ground
  Ignition switch ON
  4.5 to 14 V
  2E-1*1 - Body ground
  Ignition switch ON
  4.5 to 14 V
  1. *1: w/ Smart Key System
  2. *2: w/ Sliding Roof
  Result:
  
  Result
  Proceed to
  Voltage is not present in one circuit.
  A
  Voltage is present in all the circuits.
  B

REPAIR OR REPLACE HARNESS OR CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK)

A

17.SYSTEM CHECK

Select the circuit that did not present the voltage in the step 16.

Result:

Tester Connection
System that uses the circuit
Proceed to
2D-8 - Body ground
SFI System
A
2C-8*2 - Body ground
Sliding Roof Control System
B
2E-1*1 - Body ground
Smart Key System
C
1. *1: w/ Smart Key System
2. *2: w/ Sliding Roof

Go to step 19

REPLACE MAIN BODY ECU

A

18.CHECK HARNESS AND CONNECTOR (ECM CIRCUIT)

Disconnect the A50 connector.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
A50-8 (SPD)*1 - Body ground
Always
10 kΩ or higher
A50-38 (SPD)*2 - Body ground
Always
10 kΩ or higher
Result:
Result
Proceed to
OK (for 2AZ-FE)
A
OK (for 2ZR-FE)
B
NG
C
1. *1: for 2AZ-FE
2. *2: for 2ZR-FE

REPLACE ECM (for 2ZR-FE) (COROLLA_ZRE142 RM000001CN0030X.html)

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE ECM (for 2AZ-FE) (COROLLA_ZRE142 RM000002WT506MX.html)

19.CHECK HARNESS AND CONNECTOR (SLIDING ROOF CONTROL ECU CIRCUIT)

Disconnect the O11 connector.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
O11-8 (SPD) - Body ground
Always
10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE SLIDING ROOF CONTROL ECU (COROLLA_ZRE142 RM000002W9B01WX.html)

Result	Proceed to
OK	A
NG (for TMC Made)	B
NG (except for TMC Made)	C

Item	Condition
Tool setting	5 V/DIV., 20 ms./DIV.
Vehicle condition	Driving at approximately 12 mph (20 km/h)

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

Result	Proceed to
OK (for Radio Receiver Type)	A
OK (for Radio and Display Type)	B
NG	C