- When the condition that the IG terminal voltage of ECU is more than 10 +- 0.5 V and the B terminal voltage of ECU is 1.0 V or less than while the main relay is in drive condition continued for 0.5 sec.
- After the condition that the upper reaches voltage of the main solenoid when the main relay is ON is 2 V or less continued for 40 +- 10 msec. and when turning the electricity 1 +- 0.1 sec. later and detecting the short circuit condition 4 times continuously.
- When detecting that the IG terminal voltage of ECU is 10 +- 0.5 V or more when the main relay is not driving and the condition that the IG terminal voltage is less than the voltage added 4 V to the B terminal voltage of ECU continued for 2 secs.
| Last Modified: 4-30-2014 | 6.6 C | Doc ID: RM000001CU8002X |
| Model Year: 2006 | Model: LX470 | Prod Date Range: [05/2005 - ] |
| Title: SUSPENSION CONTROL: ACTIVE HEIGHT CONTROL SUSPENSION: C1743/43; Height Control Main Relay Malfunction; 2006 MY LX470 [05/2005 - ] | ||
|
DTC |
C1743/43 |
Height Control Main Relay Malfunction |
DESCRIPTION
This relay is to supply power source to the suspension control ECU. The relay comes ON a few seconds after the ignition switch is turned ON.
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
C1743/43 |
Any of the following 1., 2. or 3. detected: |
|
Fail-safe function:
If a trouble occurs in the AHC main relay circuit, the ECU prohibits the height control and fixed the damping force at the sport mode.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
When using the intelligent tester, start from *1. When not using the intelligent tester, start from *2.
PROCEDURE
|
1. |
PERFORM ACTIVE TEST USING INTELLIGENT TESTER (AHC MAIN RELAY)*1 |
(a) Connect the intelligent tester (with CAN VIM) to the DLC3.
(b) Turn the ignition switch ON and push the intelligent tester main switch ON.
(c) Select the ACTIVE TEST mode on the intelligent tester.
(d) Check that the operation sound of the AHC main relay when operating it with the intelligent tester.
OK:
The operation sound of the AHC main relay should be heard.
| NG |
|
| OK |
|
|
2. |
CHECK SUSPENSION CONTROL ECU*2 |
|
(a) Using SST, connect terminals 12 (TS) and 4 (CG) of the DLC3. |
|
SST: 09843-18040
(b) Push the DOWN button of the height select switch 5 times or more within 5 seconds after turning the ignition switch ON.
HINT:
At this time the height control OFF indicator light flashes at 0.25 second intervals.
(c) Change the damping mode select switch to the SPORT 2 position.
(d) Push the DOWN button of the height select switch, then check the operation sound of the AHC main relay.
OK:
The operation sound of the AHC main relay should be heard.
| OK |
|
|
|
3. |
CHECK WIRE HARNESS (SUSPENSION CONTROL ECU - BODY GROUND) |
|
(a) Remove the suspension control ECU with connectors still connected. |
|
(b) Turn the ignition switch ON.
(c) Measure the voltage between terminal MRLY of the suspension control ECU and body ground.
Standard voltage:
|
Tester Connection |
Specified Condition |
|---|---|
|
S6-25 (MRLY) - Body ground |
9 to 14 V |
| NG |
|
|
|
4. |
INSPECT AHC MAIN RELAY |
|
(a) Disconnect the AHC main relay connector. |
|
(b) Remove the AHC main relay from the suspension control ECU.
(c) Measure the resistance between each pair of terminal of the motor relay.
Standard resistance:
|
Tester Connection |
Specified Condition |
|---|---|
|
1 - 3 |
Reference value 62 Ω |
|
2 - 4 |
10 kΩ or higher |
(d) Apply battery positive voltage between terminals 1 and 3.
(e) Measure the resistance between terminals 2 and 4.
Standard resistance:
|
Tester Connection |
Specified Condition |
|---|---|
|
2 - 4 |
Below 1 Ω |
| NG |
|
|
|
5. |
CHECK WIRE HARNESS (SUSPENSION CONTROL ECU - AHC MAIN RELAY AND BATTERY) |
| NG |
|
| OK |
|
|
|