240 L4-2320cc 2.3L SOHC VIN 83 B230FD (1993)
-Check the HO2S reference voltage
If the reading is constant over 1.0 V:
-Check the HO2S reference voltage EJ2.
EJ2
Checking The Heated Oxygen Sensor (HO2S) Reference Voltage
-Ignition on.
-Disconnect the HO2S 1-pole connector.
Connect a voltmeter between the 1-pole connector (by the control module) and GND.
The voltmeter should read approx. 0.5 V.
If this value is OK:
-Check the MAF sensor GND point EJ8.
If the reading is approx. 0 V:
-Connect the test box.
If the reading is over 1 volt:
-Check the wiring between MFI #24 and the HO2S for short circuits.
When the fault has been remedied:
-Check the signal from the HO2S in accordance with EJ1.
EJ3
Connecting The Test Box
Connect the test box to MFI LH 2.4/LH 3.1 and check the GND points in accordance with P1-P2.
-Continue with Checking the signal wiring EJ4.
EJ4
Checking Signal Wiring
