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:

Parking Brake Switch Circuit
DESCRIPTION The Multiplex network body ECU receives parking brake switch signal. WIRING DIAGRAM INSPECTION PROCEDURE 1 READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to DLC3.  Turn the ignition switch ON and push the intelligent tester main switch ON.  Se ...

Inspection
1. INSPECT BRAKE CYLINDER AND PISTON (a) Check the brake cylinder bore and front disc brake piston for rust or scoring. 2. INSPECT PAD LINING THICKNESS (a) Using a ruler, measure the pad lining thickness. Standard thickness: 12.0 mm (0.472 in.) Minimum thickness: 1.0 mm (0.039 in.) 3. ...

On-vehicle inspection
1. INSPECT FOR FUEL PUMP OPERATION AND FUEL LEAK (a) Check fuel pump operation. (1) Connect the intelligent tester to the DLC3. (2) Turn the engine switch on (IG) and push the intelligent tester main switch on. NOTICE: Do not start the engine. (3) Select the following menu it ...

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