Last Modified: 4-30-2014 6.6 C Doc ID: RM000001CFI001X agn Model Year: 2006 Model: LX470 Prod Date Range: [05/2005 - ] Title: AIR CONDITIONING: AIR CONDITIONING SYSTEM: 18; Emission Gas Sensor Circuit; 2006 MY LX470 [05/2005 - ] 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) Exhaust gas sensor Harness or connector between exhaust gas sensor and A/C amplifier A/C amplifier 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 REPLACE AIR CONDITIONING AMPLIFIER cardi OK REPLACE AIR CONDITIONING AMPLIFIER