Toyota RAV4 manuals

Toyota Sienna Service Manual: System Voltage

System Voltage

MONITOR DESCRIPTION

The battery supplies electricity to the ECM even when the ignition switch is off. This power allows the ECM to store data such as DTC history, freeze frame data and fuel trim values. If the battery voltage falls below a minimum level, these memories are cleared and the ECM determines that there is a malfunction in the power supply circuit. When the engine is next started, the ECM illuminates the MIL and sets the DTC.

System Voltage

HINT:

If DTC P0560 is set, the ECM does not store other DTCs.

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

1 CHECK FUSE (EFI NO. 1 FUSE)

CHECK FUSE (EFI NO. 1 FUSE)

(a) Remove the EFI No. 1 fuse from the engine room junction block.

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

Standard resistance: Below 1 Ω

(c) Reinstall the EFI No. 1 fuse.

2 INSPECT ECM (BATT VOLTAGE)

INSPECT ECM (BATT VOLTAGE)

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

Standard voltage

REPLACE ECM (See page ES-498)

3 CHECK HARNESS AND CONNECTOR (ECM - EFI NO. 1 FUSE)

CHECK HARNESS AND CONNECTOR (ECM - EFI NO. 1 FUSE)

(a) Check the harness and the connector between the EFI No. 1 fuse and ECM.

(1) Remove the EFI No. 1 fuse from the engine room junction block.

(2) Disconnect the E4 ECM connector.

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

Standard resistance :

(4) Reconnect the ECM connector.

(5) Reinstall the EFI No. 1 fuse.

4 CHECK HARNESS AND CONNECTOR (EFI NO. 1 FUSE - BATTERY)

CHECK HARNESS AND CONNECTOR (EFI NO. 1 FUSE - BATTERY)

(a) Check the harness and the connector between the EFI No. 1 fuse and battery.

(1) Remove the EFI No. 1 fuse from the engine room junction block.

(2) Disconnect the negative battery cable.

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

Standard resistance:

(4) Reconnect the negative battery cable.

(5) Reinstall the EFI No. 1 fuse

5 INSPECT BATTERY

(a) Check that the battery is not depleted.

CHECK AND REPLACE ENGINE ROOM RELAY BLOCK

Cold Start Ignition Timing Performance
DESCRIPTION This monitor will run when the engine is started at -10 to 50°C (14 to 122°F) of the engine coolant temperature. The DTC will set after the engine idling for 13 seconds (2 trip ...

Internal Control Module Random Access Memory (RAM) Error
DESCRIPTION The ECM continuously monitors its own internal memory status, internal circuits, and output signals transmitted to the throttle actuator. This self-check ensures that the ECM is ...

Other materials:

A/C ECU Communication Stop
DTC B1262 A/C ECU Communication Stop DESCRIPTION DTC B1262 is output when communication between the A/C amplifier and the multiplex network gateway ECU stops for more than 10 seconds. DTC No. DTC Detection Condition Trouble Area B1262 A/C ECU communicat ...

For automatic air conditioning system
ON-VEHICLE INSPECTION 1. INSPECT AIR INLET CONTROL SERVO MOTOR (a) Remove the air inlet control servo motor. (b) Connect the positive (+) lead from the battery to terminal 4 and negative (-) lead to terminal 5, then check that the lever turns to "RECIRCULATION" side smoothly. ...

Fold Lock Switch Circuit
DESCRIPTION Each of the left and right seats has a fold lock switch that detects the lock condition of the seat legs and floor when the seat is in the stowed state. If the fold lock switch detects an unlock condition, the 3rd SEAT indicator on the combination meter will come on. WIRING DIAGR ...

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