900 Turbo Convertible L4-1985cc 2.0L DOHC Turbo EFI (1994)
EXH Warning: Component Location
COMPONENT LOCATION VIEW
EXH Warning: Component ID
COMPONENT ID
22A
Main fuse board in the dashboard.
47L
EXH warning lamp in the main instrument display panel.
416
Relay, EXH warning, on main relay board in the dashboard.
417
EXH temperature sensor, on the three-way catalytic converter.
540
Main instrument display panel on the dashboard.
Grounding Points
G33S
Grounding point, connector bracket (Signal) below the left-hand A pillar.
G34S
Grounding point, control module bracket (Signal) below the right-hand A pillar.
DESCRIPTION OF OPERATION
Cars for certain markets are equipped with a monitoring system for catalytic converter overheating.
The system consists of:
^
Temperature sensor 417
^
Electronic relay 416
^
Warning lamp 47L
When catalytic converter temperature reaches 825 +/-25 °C, the warning lamp lights up and remains on until the temperature drops by about 10 °C
.
When current (+15 circuit) is applied to pin 4 of the relay, the warning lamp is connected to ground and lights up for about 3 seconds. The lamp
will not light up again unless the catalytic converter temperature exceeds the preset limit.
As the temperature rises, the current between pins 3 and 1 of the temperature sensor changes. When the change in the resistance of the sensor is
