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 |
|
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|
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:
Initialization
INITIALIZATION
1. INITIALIZE SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY)
NOTICE:
When the sliding roof glass, sliding roof housing or sliding roof ECU
(sliding roof drive gear sub-assembly) is replaced or removed and installed,
t ...
Terminals Of Ecu
TERMINALS OF ECU
1. CHECK POSITION CONTROL ECU AND SWITCH ASSEMBLY
(a) Disconnect the T10 and T11 position control ECU and switch assembly connectors.
(b) Measure the voltage and resistance according to the value(s) in the table
below.
HINT:
Measure t ...
Replacement
REPLACEMENT
PROCEDURE
1. RECOVER REFRIGERANT FROM REFRIGERATION SYSTEM
(a) Start up the engine.
(b) Turn the A/C switch on.
(c) Operate the cooler compressor at an engine speed of approximately 1000 rpm
for 5 to 6 minutes to circulate the refrigerant. T ...
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