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:

Removal
1. REMOVE ENGINE AND TRANSAXLE HINT: (See page EM-26) 2. REMOVE AUTOMATIC TRANSMISSION WITH TRANSFER HINT: (See page AX-164) 3. REMOVE TRANSFER ASSEMBLY HINT: (See page TF-8) 4. REMOVE CTR DIFFERENTIAL LOCK SLEEVE HINT: (See page TF-13) 5. REMOVE TRANSFER CASE OIL SEAL (a) Using SS ...

ECM Power Source Circuit
DESCRIPTION When the ignition switch is turned to the ON position, the battery voltage is applied to terminal IGSW of the ECM. The ECM MREL output signal causes a current to flow to the coil, closing the contacts of the EFI relay and supplying power to terminal +B of the ECM. If the igniti ...

Installation
1. Install thermostat (a) Install a new gasket to the thermostat. (b) Install the thermostat with the jiggle valve facing up. Hint: the jiggle valve may be set within 10° on either side of the prescribed position. 2. INSTALL WATER INLET (a) Install the water inlet with the 2 nuts . ...

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