- Smog ventilation sensor
- Harness or connector between smog ventilation sensor and air conditioning amplifier assembly
- Air conditioning amplifier assembly
| Last Modified: 11-27-2007 | 1.6 C | |
| Service Category: Vehicle Interior | Section: Heating/Air Conditioning | |
| Model Year: 2008 | Model: LX570 | Doc ID: RM000002LLE006X |
| Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: DESCRIPTION (2008 LX570) | ||
|
DTC |
B1418/18 |
Exhaust Gas Sensor Circuit |
DESCRIPTION
The smog ventilation sensor, which is installed on the front of the cooler condenser assembly, automatically changes to fresh, fresh/recirculation or recirculation mode operation. The smog ventilation sensor detects CO and HC in the emission gas and transmits signals to the air conditioning amplifier assembly.
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
B1418/18 |
An open or short in the smog ventilation sensor circuit (HC, CO). |
|
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
|
1. |
INSPECT FUSE (A/C IG) |
(a) Remove the A/C IG fuse from the cowl side junction block LH.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A/C IG fuse |
Always |
Below 1 Ω |
|
|
2. |
READ VALUE USING TECHSTREAM (SMOG VENTILATION SENSOR) |
(a) Use the Data List to check if the smog ventilation sensor is functioning properly.
Air Conditioner
|
Tester Display |
Measurement Item / Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
Emission Gas Sensor |
Smog ventilation sensor / Min.: 0, Max.: 255 |
Decreases as the gas amount increases |
- |
OK:
The display is as specified in the normal condition.
|
|
3. |
CHECK HARNESS AND CONNECTOR (SMOG VENTILATION SENSOR - BODY GROUND) |
(a) Disconnect the A45 smog ventilation sensor connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A45-6 (E) - Body ground |
Always |
Below 1 Ω |
|
|
4. |
CHECK HARNESS AND CONNECTOR (SMOG VENTILATION SENSOR - BATTERY) |
(a) Disconnect the A45 smog ventilation sensor connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
A45-3 (IG) - Body ground |
Engine switch on (IG) |
11 to 14 V |
|
|
5. |
INSPECT SMOG VENTILATION SENSOR |
(a) Remove the smog ventilation sensor
.
(b) After applying battery voltage to terminals 3 (IG) and 6 (E) for more than 30 seconds, measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
1 (SG) - 2 (DGS) |
15 to 25°C (59 to 77°F) |
15 to 40 kΩ |
HINT:
When the sensor is exposed to the exhaust gas, the resistance decreases.
|
|
6. |
CHECK HARNESS AND CONNECTOR (SMOG VENTILATION SENSOR - AIR CONDITIONING AMPLIFIER) |
(a) Disconnect the A45 smog ventilation sensor connector.
(b) Disconnect the E35 amplifier connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A45-1 (SG) - E35-30 (SG-4) |
Always |
Below 1 Ω |
|
A45-2 (DGS) - E35-23 (DGS) |
||
|
E35-30 (SG-4) - Body ground |
||
|
E35-23 (DGS) - Body ground |
Always |
10 kΩ or higher |
|
|
|