Ignition Switch Circuit

THEFT DETERRENT: THEFT DETERRENT SYSTEM: Ignition Switch Circuit

Ignition Switch Circuit

DESCRIPTION

When turning the power switch ON (IG), battery positive voltage is applied to terminal SIG of the main body ECU.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT FUSE (ECU-IG)
(a) Remove the ECU-IG fuse from the driver side junction block.
(b) Measure the resistance of the fuse.
Standard resistance:
Below 1 Ohms
NG -- REPLACE FUSE
OK -- Continue to next step.

2. INSPECT IG1 RELAY




(a) Remove the IG1 relay from the driver side junction block.
(b) Measure the resistance of the relay.
Standard resistance:






NG -- REPLACE IG1 RELAY
OK -- Continue to next step.

3. CHECK WIRE HARNESS (DRIVER SIDE JUNCTION BLOCK - BATTERY)




(a) Disconnect the 1B junction block connector.
(b) Measure the voltage of the wire harness side connector.
Standard voltage:






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

4. CHECK WIRE HARNESS (DRIVER SIDE JUNCTION BLOCK - BODY GROUND)




(a) Disconnect the 1E junction block connector.
(b) Measure the resistance of the wire harness side connector.
Standard resistance:






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

5. CHECK POWER SOURCE CONTROL ECU (IG1D VOLTAGE)




(a) Disconnect the 1J junction block connector.
(b) Measure the voltage of the wire harness side connector.
Standard voltage:






OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
NG -- Continue to next step.

6. CHECK WIRE HARNESS (DRIVER SIDE JUNCTION BLOCK - POWER SOURCE CONTROL ECU AND BODY GROUND)




(a) Disconnect the 1J junction block connector.
(b) Disconnect the P6 ECU connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- GO TO SMART KEY SYSTEM (for Starting)