ECU Power Source Circuit

SUSPENSION CONTROL: ACTIVE HEIGHT CONTROL SUSPENSION: ECU Power Source Circuit

ECU Power Source Circuit

DESCRIPTION

This circuit supplies the power source to the suspension control ECU.

WIRING DIAGRAM





INSPECTION PROCEDURE
NOTICE:
- Before performing troubleshooting, inspect the connectors of related circuits.
- If the suspension control ECU or height control sensor is replaced, the vehicle height offset calibration must be performed Testing and Inspection.

PROCEDURE

1. READ VALUE USING TECHSTREAM (IG POWER SOURCE VOLTAGE)
(a) Turn the engine switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the engine switch on (IG) and the Techstream on.
(d) Enter the following menus: Chassis / AHC / Data List.
(e) According to the display on the Techstream, read the Data List.

AHC





OK:
11 to 14 V
NG -- INSPECT FUSE (ECU-IG NO. 4)
OK -- CHECK INDICATOR CIRCUIT
2. INSPECT FUSE (ECU-IG NO. 4)
(a) Remove the ECU-IG No. 4 fuse from the cowl side junction block RH.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






NG -- CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK RH - ECU)
OK -- Continue to next step.
3. INSPECT COWL SIDE JUNCTION BLOCK RH (IG NO. 4 RELAY)
(a) Disconnect the K30 ECU connector.





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






NG -- CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK RH - ECU AND BODY GROUND)
OK -- REPLACE SUSPENSION CONTROL ECU
4. CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK RH - ECU AND BODY GROUND)





(a) Disconnect the K30 and K31 ECU connectors.
(b) Disconnect the 3C cowl side junction block RH connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (BATTERY - COWL SIDE JUNCTION BLOCK RH)
(a) Disconnect the 3A cowl side junction block RH 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.
6. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - COWL SIDE JUNCTION BLOCK RH AND BODY GROUND)
(a) Disconnect the 3C cowl side junction block RH connector.





(b) Measure the voltage and resistance according to the value(s) in the tables below.
Standard Voltage:






Standard Resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
7. CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK RH - ECU)
(a) Disconnect the K30 ECU connector.





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





HINT:
If a fuse is blown, replace the fuse.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE COWL SIDE JUNCTION BLOCK RH