Toyota Corolla Cross: ECU Power Source Circuit
DESCRIPTION
When the ignition switch is turned to 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.
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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.
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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 |
|
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|
2. |
INSPECT ECU TERMINAL VOLTAGE (+B TERMINAL) |
|
*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:
Components
COMPONENTS
ILLUSTRATION
*1
FRONT DRIVE SHAFT OIL SEAL LH
*2
FRONT DRIVE SHAFT OIL SEAL RH
●
Non-reusable part
-
Replacement
REPLACEMENT
CAUTION / NOTICE / HINT
The necessary procedures (adjustment, calibration, initialization, or registration)
that must be performed after parts are removed and installed, or replaced du
SEE MORE:
Motor Electronics Coolant Temperature Sensor Circuit Short to Ground (P0A0011,P0A0015)
DESCRIPTION Refer to the description for DTC P0A001C.
Click here
DTC No. Detection Item
DTC Detection Condition
Trouble Area MIL
Warning Indicate Note
P0A0011 Motor Electronics Coolant Temperature Sensor Circuit Short to Ground
Short to ground de
Definition Of Terms
DEFINITION OF TERMS
Term Definition
Monitor Description Description of what the ECM monitors and how it detects malfunctions (monitoring purpose and details).
Related DTCs Group of diagnostic trouble codes that are output by the ECM based on the same malfunction detection
