Tire Pressure Warning System Ecu Power Source Circuit
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
INSPECT FUSE (ECU-IG)
INSPECT IGNITION RELAY NO. 1
CHECK HARNESS AND CONNECTOR (ECU - BATTERY AND BODY GROUND)
TIRE PRESSURE WARNING SYSTEM - ECU Power Source Circuit |
DESCRIPTION
This is the power source for the tire pressure warning ECU.
WIRING DIAGRAM
INSPECTION PROCEDURE
- NOTICE:
- When replacing the tire pressure warning ECU, read the transmitter IDs stored in the old ECU using the Techstream and write them down before removal.
- It is necessary to perform initialization (COROLLA_ZRE142 RM000000XMZ07PX.html) after registration (COROLLA_ZRE142 RM000000XN108OX.html) of the transmitter IDs into the tire pressure warning ECU after the ECU has been replaced.
Remove the ECU-IG fuse from the instrument panel junction block.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Condition
| Specified Condition
|
EUC-IG
| Always
| Below 1 Ω
|
| 2.INSPECT IGNITION RELAY NO. 1 |
Remove the IG1 relay from the instrument panel junction block.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Condition
| Specified Condition
|
3 - 5
| Battery voltage is not applied to terminals 1 and 2
| 10 kΩ or higher
|
Battery voltage is applied to terminals 1 and 2
| Below 1 Ω
|
| | REPLACE IGNITION RELAY NO. 1 |
|
|
| 3.CHECK HARNESS AND CONNECTOR (ECU - BATTERY AND BODY GROUND) |
Disconnect the E94 ECU connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection
| Switch Condition
| Specified Condition
|
E94-7 (IG) - Body ground
| Ignition switch ON
| 11 to 14 V
|
Ignition switch off
| Below 1 V
|
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Condition
| Specified Condition
|
E94-9 (GND) - Body ground
| Always
| Below 1 Ω
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
