Toyota Corolla Cross: ECU Power Source Circuit
DESCRIPTION
When the ignition switch is ON, auxiliary battery voltage is applied to terminal MREL of the ECM through the coil of the EFI-MAIN relay. This causes the EFI-MAIN relay to close, which supplies power to terminal +B of the TCM.
WIRING DIAGRAM
Refer to DTC U010087.
Click here .gif)
CAUTION / NOTICE / HINT
NOTICE:
- Inspect the fuses for circuits related to this system before performing the following procedure.
- Perform registration and/or initialization when parts related to the continuously
variable transaxle system are replaced.
Click here
PROCEDURE
|
1. |
CHECK HARNESS AND CONNECTOR (TCM - BODY GROUND) |
(a) Disconnect the C80 TCM connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
C80-2 (E1) - Body ground |
Always |
Below 1 Ω |
(c) Connect the C80 TCM connector.
| NG | .gif) |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
.gif)
|
2. |
INSPECT ECU TERMINAL VOLTAGE (+B TERMINAL) |
.png)
|
*a |
Front view of wire harness connector (to TCM) |
- |
- |
(a) Disconnect the C80 TCM connector.
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
C80-1 (+B) - Body ground |
Ignition switch ON |
11 to 14 V |
(d) Connect the C80 TCM connector.
| OK | |
CHECK FOR INTERMITTENT PROBLEMS Click here Click here |
|
|
3. |
CHECK HARNESS AND CONNECTOR (TCM - EFI-MAIN NO. 1 RELAY) |
(a) Remove the EFI-MAIN NO. 1 relay from the No. 1 engine room relay block assembly.
(b) Disconnect the C80 TCM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open):
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
C80-1 (+B) - 3 (EFI-MAIN NO. 1 Relay) |
Always |
Below 1 Ω |
|
C80-1 (+B) or 3 (EFI-MAIN NO. 1 Relay) - Body ground |
Always |
10 kΩ or higher |
(d) Connect the C80 TCM connector.
(e) Install the EFI-MAIN NO. 1 relay to the No. 1 engine room relay block assembly.
| OK | |
GO TO ECM POWER SOURCE CIRCUIT (ENGINE CONTROL SYSTEM / SFI SYSTEM) |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
READ NEXT:
Front Differential Oil Seal (for Lh Side)
Components
COMPONENTS
ILLUSTRATION
*1
FRONT DRIVE SHAFT OIL SEAL LH
-
-
●
Non-reusable part
-
-
Components
COMPONENTS
ILLUSTRATION
*1
DIFFERENTIAL SIDE OIL SEAL
*2
FRONT DRIVE SHAFT OIL SEAL RH
●
Non-reusable part
SEE MORE:
Meter display
■ Locations of gauges and meters
The units of measure may differ depending on the intended destination of
the vehicle.
Tachometer
Displays the engine speed in revolutions per minute
Outside temperature
Displays the outside temperature within the range of -40ºF (-40ºC) to
140ºF
(60ºC)
Throttle Actuator "A" Control System Actuator Stuck Open (P211172,P211173)
DESCRIPTION The throttle actuator is operated by the ECM and opens and closes the throttle valve using gears. The opening angle of the throttle valve is detected by the throttle position sensor, which is built into the throttle body with motor assembly. The throttle position sensor provides feedback
