| Last Modified: 11-27-2007 | 1.6 J | |
| Service Category: Suspension | Section: Suspension Control System | |
| Model Year: 2008 | Model: LX570 | Doc ID: RM000001CTO006X |
| Title: SUSPENSION CONTROL: ACTIVE HEIGHT CONTROL SUSPENSION: DESCRIPTION (2008 LX570) | ||
|
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
.
PROCEDURE
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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
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
IG Power Source Voltage |
Power supply voltage / min.: 0 V max.: 255 V |
Engine switch on (IG): 11 to 14 V |
- |
OK:
11 to 14 V
|
|
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:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
ECU-IG No. 4 fuse |
Always |
Below 1 Ω |
|
|
3. |
INSPECT COWL SIDE JUNCTION BLOCK RH (IG NO. 4 RELAY) |
(a) Disconnect the K30 ECU connector.
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(b) Measure the voltage according to the value(s) in the table below. Standard Voltage:
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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:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
K30-5 (IG) - 3C-5 |
Always |
Below 1 Ω |
|
K30-1 (GND) - Body ground |
Always |
Below 1 Ω |
|
K31-6 (GND) - Body ground |
Always |
Below 1 Ω |
|
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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:
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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:
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7. |
CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK RH - ECU) |
(a) Disconnect the K30 ECU connector.
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(b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
HINT:
If a fuse is blown, replace the fuse. |
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