Ignition Switch Circuit

THEFT DETERRENT: THEFT DETERRENT SYSTEM: Ignition Switch Circuit
- Ignition Switch Circuit

DESCRIPTION

The main body ECU determines the ignition switch position (OFF, ON, ACC or engine running) based on signals from the IG circuit.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM (IGNITION SWITCH)

(a) Using the Techstream, read the Data List.

Main Body





OK:

When the ignition switch is operated, "ON" is displayed on the Techstream screen.

NG -- INSPECT FUSE (AM1, ECU-IG No. 2)

OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Theft Deterrent System

2. INSPECT FUSE (AM1, ECU-IG No. 2)

(a) Remove the AM1 and ECU-IG No. 2 fuses from the main body ECU.

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

Standard resistance:





NG -- REPLACE FUSE
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BATTERY)

(a) Disconnect the DA main body ECU connector.





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

Standard voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. INSPECT IGNITION SWITCH





(a) Remove the ignition switch.

(1) For 1GR-FE, refer to the following procedures Removal.

(2) For 1UR-FE, refer to the following procedures Removal.

(3) For 3UR-FE, refer to the following procedures Removal.

(4) For 3UR-FBE, refer to the following procedures Removal.

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

Standard resistance:





Result





E -- REPLACE IGNITION SWITCH Removal

D -- REPLACE IGNITION SWITCH Removal

C -- REPLACE IGNITION SWITCH Removal

B -- REPLACE IGNITION SWITCH Removal
A -- Continue to next step.

5. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - IGNITION SWITCH AND BODY GROUND)





(a) Disconnect the DD main body ECU connector.

(b) Disconnect the J9 ignition switch connector.

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

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE MAIN BODY ECU