Toyota 4Runner manuals

Toyota 4Runner: Diagnosis System



(a) When troubleshooting a vehicle with a diagnosis system, connect the Techstream to the DLC3 of the vehicle and read various data output from the steering lock actuator assembly (steering lock ECU).

The steering lock actuator assembly (steering lock ECU) stores DTCs when the ECU detects a malfunction in itself or in its circuits.

(b) The diagnosis information of the steering lock actuator assembly (steering lock ECU) is transmitted to the Techstream via the certification ECU as the steering lock actuator assembly (steering lock ECU) is not connected to the CAN communication system.

(c) The steering lock actuator assembly (steering lock ECU) does not store DTCs regarding past problems.

(d) When the engine switch is off, the main body ECU may occasionally go into a non-active state called sleep mode. Communication with the Techstream is not possible if the main body ECU is in sleep mode. Therefore, before proceeding with the inspection, it is necessary to perform the following steps to wake up the ECU: With the engine switch off, open the driver door. Then (with the engine switch still off) open and close any door several times at 1.5 second intervals.

(e) As the steering lock actuator assembly (steering lock ECU) memory data is cleared, do not remove the fuses or disconnect the cable from the battery terminals until the DTCs are checked and noted.

(f) Malfunctions related to systems other than the steering lock actuator assembly (steering lock ECU) system may cause DTCs to be output. Note any DTCs related to other systems.

Terminals Of Ecu
TERMINALS OF ECU 1. CHECK STEERING LOCK ECU (a) Disconnect the F68 steering lock ECU connector. (b) Measure the voltage and resistance according to the value(s) in the table below. ...

Dtc Check / Clear
DTC CHECK / CLEAR 1. CHECK DTC (a) Connect the Techstream to the DLC3. (b) Turn the engine switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Smart Key / ...

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Speaker Circuit
DESCRIPTION If there is a short in a speaker circuit, the stereo component amplifier assembly detects it and stops output to the speakers. Thus sound cannot be heard from the speakers even if there is no malfunction in the stereo component ...

Back Door Support
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