Toyota Venza: ECU Power Source Circuit
DESCRIPTION
When the ignition switch is turned to ON, voltage from the ECM's MREL terminal is applied to the EFI MAIN relay. This causes the contacts of the EFI MAIN relay to close, which supplies power to terminal +B of the TCM.
WIRING DIAGRAM
PROCEDURE
|
1. |
CHECK HARNESS AND CONNECTOR (TCM - BODY GROUND) |
|
(a) Turn the ignition switch off. |
|
(b) Disconnect the TCM connectors.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
B40-8 (E1) - Body ground |
Always |
Below 1 Ω |
|
*1 |
Front view of wire harness connector (to TCM) |
| NG | .gif) |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
.gif)
|
2. |
INSPECT ECU TERMINAL VOLTAGE (+B TERMINAL) |
|
(a) Disconnect the TCM connectors. |
|
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
B40-18 (+B) - Body ground |
Ignition switch ON |
11 to 14 V |
|
*1 |
Front view of wire harness connector (to TCM) |
| OK | |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
|
3. |
CHECK HARNESS AND CONNECTOR (TCM - ENGINE ROOM JUNCTION BLOCK ASSEMBLY) |
(a) Turn the ignition switch off.
(b) Disconnect the TCM connector.
(c) Remove the engine room junction block assembly from the engine room relay block.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open):
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
B40-18 (+B) - 1F-18 (+B) |
Always |
Below 1 Ω |
Standard Resistance (Check for Short):
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
B40-18 (+B) or 1F-18 (+B) - Body ground |
Always |
10 kΩ or higher |
|
*1 |
Engine Room Junction Block Assembly |
|
*2 |
Front view of wire harness connector (to Engine Room Junction Block Assembly) |
|
*3 |
Front view of wire harness connector (to TCM) |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
4. |
INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY |
|
(a) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
| OK | |
GO TO ECM POWER SOURCE CIRCUIT (ENGINE CONTROL SYSTEM / SFI SYSTEM) |
| NG | |
REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY |
Transmission Control Switch Circuit
DESCRIPTION
When the shift lever is in S and it is moved toward "-" or "+", it is possible
to select different shift ranges (1st through 6th ranges).
Moving the shift lever tow ...
Other materials about Toyota Venza:
Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART
If a trouble code is displayed during the DTC check, check the trouble areas
listed for that code in the table below and proceed to the appropriate page.
Cruise Control System
DTC Code
Detection Item
...
Freeze Frame Data
FREEZE FRAME DATA
1. DESCRIPTION
The ECM records vehicle and driving condition information as freeze
frame data the moment a DTC is stored. When troubleshooting, freeze frame
data can be helpful in determining whether the vehicle was moving or ...
Short in Torque Converter Clutch Solenoid Circuit (Shift Solenoid Valve SL)
(P2769,P2770)
DESCRIPTION
Shift solenoid valve SL is turned on and off by signals from the TCM to control
the hydraulic pressure acting on the lock-up relay valve, which then controls operation
of the lock-up clutch.
DTC No.
DTC Detection Conditi ...
0.148