Vanden Plas (X300) L6-4.0L (AJ16) (1996)
Exhaust System Temperature Indicator: Testing and Inspection
NOTE: This lamp is present in all vehicle instrument packs but only Japanese market cars have the sensor circuitry installed and connected. The lamp
will be illuminated during instrument pack reset sequence at each ignition cycle.
1. Ensure harness wiring is intact from instrument pack pin 23 (48 way connector) to catalyst switching module and from switching module to each
thermocouple.
2. Check continuity across each thermocouple, renew if open circuit is recorded.
3. Measure voltage at pack pin 23, 48-way connector, 0 volts indicates signal low i.e. lamp ON. A value of 12 V at pin 15 indicates healthy signal, or
no sensing circuitry installed.
Exhaust Temperature, Fig.1
1. Instrument pack
20. Catalyst switching module
21. Thermocouple