Toyota RAV4 manuals

Toyota Sienna Service Manual: ECU Power Source Circuit

DESCRIPTION

This is the power source for the tire pressure warning ECU.

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE: When replacing the tire pressure warning ECU, read the transmitter IDs stored in the old ECU using the intelligent tester and write them down before removal.

It is necessary to register an ID code after replacing the tire pressure warning valve and transmitter and/or the tire pressure warning ECU (See page TW-20).

1 INSPECT FUSE (ECU-IG)

(a) Remove the ECU-IG fuse from the instrument panel junction block.

(b) Measure the resistance of the fuse.

Standard resistance: Below 1 Ω

2 INSPECT IGNITION RELAY NO. 1

INSPECT IGNITION RELAY NO. 1

(a) Remove the IG1 relay from the instrument panel junction block.

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance

3 CHECK HARNESS AND CONNECTOR (ECU - BATTERY AND BODY GROUND)

 CHECK HARNESS AND CONNECTOR (ECU - BATTERY AND BODY GROUND)

(a) Disconnect the T15 ECU connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard voltage

(c) Measure the resistance according to the value(s) in the table below.

Standard resistance

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See page TW-28)

Tire Pressure Warning Light Circuit
DESCRIPTION If the ECU detects trouble, the tire pressure warning light blinks (comes on after blinking for 1 minute) and tire pressure monitor is cancelled at the same time. At this time, the ECU ...

TC and CG Terminal Circuit
DESCRIPTION DTC output mode is set by connecting terminals 13 (TC) and 4 (CG) of the DLC3. The DTCs are indicated by blinks of the tire pressure warning light. WIRING DIAGRAM HINT: When eac ...

Other materials:

Open in Occupant Classification ECU Battery Positive Line
DTC B1794 Open in Occupant Classification ECU Battery Positive Line DESCRIPTION This circuit consists of the occupant classification ECU and the power source circuit (battery, fuse, wire harness). DTC B1794 is recorded when a malfunction is detected in the occupant classification ECU or t ...

Initialization
NOTICE:  Resetting the power window motor (initializing the pulse sensor) is necessary when the battery terminal is disconnected; when the master switch, wire harness, power window regulator and power window motor are replaced or removed/installed; or when the fuses are replaced. ...

Throttle / Pedal Position Sensor / Switch "D" Circuit Range / Performance
HINT: This DTC relates to the Accelerator Pedal Position (APP) sensor. DESCRIPTION Refer to DTC P2120 (See page ES-343). MONITOR DESCRIPTION The accelerator pedal position sensor is mounted on the accelerator pedal bracket. The accelerator pedal position sensor has 2 sensor elements ...

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