Toyota 4Runner manuals

Toyota 4Runner: Power Steering Warning Light Circuit

DESCRIPTION

The power steering ECU assembly is connected to the combination meter assembly via CAN communication. If the power steering ECU assembly detects a malfunction, the power steering warning light comes on. At this time, the vehicle enters fail-safe mode.

WIRING DIAGRAM


CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

INSPECT CAN COMMUNICATION SYSTEM

(a) Check for DTCs of the CAN communication system (See page ).


Result

Result

Proceed to

DTC is not output

A

DTC is output

B


B

GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)


A

2.

CHECK HARNESS AND CONNECTOR (POWER STEERING ECU ASSEMBLY - BATTERY AND BODY GROUND)

(a) Disconnect the F41 power steering ECU assembly connector.


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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

F41-5 (IG) - Body ground

Ignition switch ON

11 to 14 V

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F41-3 (GND) - Body ground

Always

Below 1 Ω

Text in Illustration

*a

Front view of wire harness connector

(to Power Steering ECU Assembly)


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

3.

PERFORM ACTIVE TEST USING TECHSTREAM (METER/GAUGE SYSTEM)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON and turn the Techstream on.

(c) Perform the Active Test of the combination meter using the Techstream (See page ).


Combination Meter

Tester Display

Test Part

Control Range

Diagnostic Note

PPS Indicator

Power steering warning light

ON or OFF

Perform the test with the vehicle stopped and the engine idling.

(d) Check that the power steering warning light operates in accordance with the Active Test.

HINT:

Reconnect the connectors and restore the vehicle to its previous condition before checking the combination meter.

OK:

The power steering warning light turns on and off in accordance with the Techstream operation.


OK

REPLACE POWER STEERING ECU ASSEMBLY


NG

INSPECT METER/GAUGE SYSTEM (HOW TO WITH PROCEED TROUBLESHOOTING)

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