- Exhaust gas sensor
- Harness or connector between exhaust gas sensor and A/C amplifier
- A/C amplifier
| Last Modified: 7-3-2017 | 6.8:8.0.40 | Doc ID: RM000001CFI002X |
| Model Year Start: 2007 | Model: LX470 | Prod Date Range: [08/2006 - ] |
| Title: AIR CONDITIONING: AIR CONDITIONING SYSTEM: 18; Emission Gas Sensor Circuit; 2007 MY LX470 [08/2006 - ] | ||
|
DTC |
18 |
Emission Gas Sensor Circuit |
DESCRIPTION
This sensor detects the exhaust gas (HC, CO) outside the vehicle and sends signal to the A/C amplifier.
|
DTC No. |
Detection Item |
Trouble Area |
|---|---|---|
|
18 |
Open or short in exhaust gas sensor circuit (HC, CO) |
|
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
|
1. |
CHECK AIR CONDITIONING AMPLIFIER |
|
(a) Remove the A/C amplifier with connectors still connected. |
|
(b) Tern the ignition switch ON.
(c) Measure the voltage between terminals DGS (A48-15) and FRSG (A48-18) of the A/C amplifier connector at the temperature.
Standard voltage:
1.0 to 4.5 V at 10 to 35°C (50 to 95°F)
HINT:
- When the sensor is exposed to the exhaust gas, the voltage goes down.
- How ever, if DTC 18 is displayed, check and replace A/C amplifier.
| OK |
|
|
|
2. |
INSPECT EXHAUST GAS SENSOR |
|
(a)
Remove the exhaust gas sensor
|
|
![2007 MY LX470 [08/2006 - ]; AIR CONDITIONING: SMOG VENTILATION SENSOR: REMOVAL](../../../../stylegraphics/info.gif "2007 MY LX470 [08/2006 - ]; AIR CONDITIONING: SMOG VENTILATION SENSOR: REMOVAL")
(b) Connect positive (+) lead from the battery to the terminal 2 and negative (-) lead to terminal 1.
(c) After keeping to apply battery positive voltage between terminals 1 and 2 for more than 30 seconds, measure resistance between terminals 3 and 5.
Standard resistance:
5 to 100 kΩ at 10 to 35°C (50 to 95°F)
HINT:
When the sensor is exposed to the exhaust gas, the voltage goes down.
| NG |
|
|
|
3. |
CHECK WIRE HARNESS (EXHAUST GAS SENSOR - AIR CONDITIONING AMPLIFIER) |
| NG |
|
| OK |
|
|
|