Toyota Venza: Tachometer Malfunction
DESCRIPTION
In this circuit, the meter CPU receives engine speed signals from the ECM using the CAN communication system (CAN No. 1 Bus). The meter CPU displays the engine speed calculated based on the data received from the ECM.
WIRING DIAGRAM
PROCEDURE
|
1. |
CHECK CAN COMMUNICATION SYSTEM |
(a) Check if a CAN communication DTC is output (See page
.gif)
).
|
Result |
Proceed to |
|---|---|
|
CAN communication DTC is not output. |
A |
|
CAN communication DTC is output. |
B |
| B | .gif) |
GO TO CAN COMMUNICATION SYSTEM |
|
.gif)
|
2. |
PERFORM ACTIVE TEST USING TECHSTREAM (TACHO METER OPERATION) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Combination Meter / Active Test.
(e) Check the operation by referring to the table below.
Combination Meter|
Tester Display |
Test Part |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
Tacho Meter Operation |
Tachometer |
0, 1000, 2000, 3000, 4000, 5000, 6000, 7000 (rpm) |
Confirm that the vehicle is stopped with the engine idling |
OK:
Tachometer indication is normal.
| NG | |
REPLACE COMBINATION METER ASSEMBLY |
|
|
3. |
READ VALUE USING TECHSTREAM (ENGINE RPM) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Combination Meter / Data List.
(e) Check the values by referring to the table below.
Combination Meter|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
Engine Rpm |
Engine speed/Min.: 0 rpm, Max.: 12750 rpm |
650 to 750 rpm (When idling) |
If data received from the ECM exceeds the range that can be displayed on the meter, the meter continues to display the maximum value of the range. |
OK:
Engine speed displayed on the Techstream is almost the same as the tachometer indication.
| NG | |
REPLACE COMBINATION METER ASSEMBLY |
|
|
4. |
READ VALUE USING TECHSTREAM (ENGINE SPEED) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine and ECT / Data List.
(e) Check the values by referring to the table below.
Engine and ECT|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
Engine Speed |
Engine speed/Min.: 0 rpm, Max.: 16383.75 rpm |
650 to 750 rpm (When idling) |
- |
OK:
Engine speed displayed on the Techstream is almost the same as the Techstream indication (Body Electrical / Combination Meter / Data List).
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG (for 2GR-FE) |
B |
|
NG (for 1AR-FE) |
C |
| B | |
GO TO SFI SYSTEM (for 2GR-FE) |
| C | |
GO TO SFI SYSTEM (for 1AR-FE) |
|
|
5. |
REPLACE ECM |
(a) Replace the ECM with a new or a known good one (See page
for 2GR-FE,
for 1AR-FE).
OK:
The operation of the tachometer returns to normal.
| OK | |
END |
| NG | |
REPLACE COMBINATION METER ASSEMBLY |
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