ECU Power Source Circuit

ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM: ECU Power Source Circuit

ECU Power Source Circuit

DESCRIPTION

This circuit provides power to operate the transponder key ECU assembly.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. INSPECT FUSE (ECU-B)

(a) Remove the ECU-B fuse from the engine room R/B and J/B.
(b) Measure the ECU-B fuse resistance.
Standard resistance:
Below 1 Ohms
(c) Reinstall the ECU-B fuse.
NG -- REPLACE FUSE
OK -- Continue to next step.
2. INSPECT FUSE (IGN)

(a) Remove the IGN fuse from the main body ECU.
(b) Measure the IGN fuse resistance.
Standard resistance:
Below 1 Ohms
(c) Reinstall the IGN fuse.
NG -- REPLACE FUSE
OK -- Continue to next step.
3. INSPECT INTEGRATION RELAY (IG2 RELAY AND AM2 FUSE)

(a) Remove the integration relay from the engine room R/B and J/B.
(b) Inspect the AM2 fuse.
(1) Remove the AM2 fuse from the integration relay.
(2) Measure the resistance of the AM2 fuse.
Standard resistance:
Below 1 Ohms
(3) Reinstall the AM2 fuse.
(c) Inspect the IG2 relay.
(1) Measure the resistance between the terminals shown below.
Standard resistance:

(2) Reinstall the integration relay.
NG -- REPLACE INTEGRATION RELAY
OK -- Continue to next step.
4. INSPECT IGNITION SWITCH ASSEMBLY

(a) Disconnect the D8 ignition switch connector.
(b) Measure the resistance between the terminals shown below.
Standard resistance:

(c) Reconnect the D8 ignition switch connector.
NG -- REPLACE IGNITION SWITCH ASSEMBLY
OK -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - BATTERY AND BODY GROUND)

(a) Disconnect the D23 transponder key ECU connector.
(b) Measure the voltage of the wire harness side connector.
Standard voltage:

(d) Reconnect the D23 transponder key ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE TRANSPONDER KEY ECU ASSEMBLY