- AHC motor relay
- Suspension control ECU
- Wire harness
| Last Modified: 7-3-2017 | 6.8:8.0.40 | Doc ID: RM000001CTP004X |
| Model Year Start: 2007 | Model: LX470 | Prod Date Range: [08/2006 - ] |
| Title: SUSPENSION CONTROL: ACTIVE HEIGHT CONTROL SUSPENSION: C1741/41; Compressor Relay Coil Malfunction; 2007 MY LX470 [08/2006 - ] | ||
|
DTC |
C1741/41 |
Compressor Relay Coil Malfunction |
DESCRIPTION
This relay is to supply power source to the pump and motor. The relay is stays ON while the height control is operated.
HINT:
"Compressor relay" refers to the AHC motor relay.
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
C1741/41 |
After the condition that the upper reaches voltage of the motor relay solenoid is 2 V or less when motor relay is ON continued for 40 +- 10 msec. and when turning on the electricity 1 sec. later and detecting the short circuit condition 2 times continuously. |
|
Fail-safe function:
If a trouble occurs in the AHC motor relay circuit, the height control is prohibited after adjusting the vehicle to the standard height in case that the height is higher than the standard or to the lowest wheel of the 4 wheels in case that the height is lower than the standard.
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 MOTOR 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 motor relay when operating it with the intelligent tester.
OK:
The operation sound of the AHC motor 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 starting the engine.
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 UP button of the height select switch, then check the operation sound of the AHC motor relay.
OK:
The operation sound of the AHC motor relay should be heard.
| OK |
|
|
|
3. |
CHECK WIRE HARNESS (ENGINE ROOM JUNCTION BLOCK (AHC MOTOR RELAY) - BODY GROUND) |
|
(a) Remove the AHC motor relay from the engine room junction block. |
|
(b) Measure the voltage between terminal 1 of the engine room junction block (for AHC motor relay) and body ground.
Standard voltage:
|
Tester Connection |
Specified Condition |
|---|---|
|
1 - Body ground |
10 to 14 V |
| NG |
|
|
|
4. |
INSPECT AHC MOTOR RELAY (Marking: AHC) |
|
(a) Remove the AHC motor relay from the engine room junction block. |
|
(b) Measure the resistance of the relay.
Standard resistance:
|
Tester Connection |
Specified Condition |
|---|---|
|
3 - 4 |
Reference value 62 Ω |
|
1 - 2 |
10 kΩ or higher |
(c) Apply battery positive voltage between terminals 3 and 4.
(d) Measure the resistance of the relay.
Standard resistance:
|
Tester Connection |
Specified Condition |
|---|---|
|
1 - 2 |
Below 1 Ω |
| NG |
|
|
|
5. |
CHECK WIRE HARNESS (SUSPENSION CONTROL ECU - AHC MOTOR RELAY AND AHC PUMP AND MOTOR) |
| NG |
|
| OK |
|
|
|