240 L4-2320cc 2.3L SOHC VIN 83 B230FD (1993)
-Ignition on. Connector disconnected.
Connect a voltmeter between terminals 1 and 2 on the temperature sensor wiring connector.
The voltmeter should read approx. 5 V if the signal wiring is OK.
If the voltmeter reads 0 V.
-Check the signal wiring for breaks or short circuits.
If the voltmeter reads approx. 5 V
-Check the EGR temperature sensor FK4.
If the voltmeter reads over 5 V.
-Check the wiring between sensor terminal 1 and #22 on the control module for short circuits.
-If the signal wiring has been short circuited the EGR temperature sensor may have broken. Check the EGR temperature sensor in accordance with
FK4 when the fault has been remedied.
FK4
Checking The EGR Temperature Sensor
-Connect the connector to the EGR temperature sensor.
-Engine idling.
Connect a voltmeter between terminal 1 on the temperature sensor connector and GND.
The voltmeter should read between 1.8--4.6 V. depending on the temperature of the sensor. (1.8 V at approx. 80°C (176°F) and 4.6 V at approx. 0°C
(32°F). Note that the A voltage over the sensor decreases with increasing temperature.
-Carefully remove the yellow hose at the EGR vacuum controller.
-Connect a vacuum pump to the hose to the EGR valve.
-Pump up a vacuum (max 30 kPa 4.3 psi).
The engine should idle badly while the voltage reading from the voltmeter should slowly decrease as temperature rises.
If the voltmeter reading is correct (1.8-4.6V) and decreases as above