Toyota 4A-FE Repair Manual page 157

4A-FE
4A-FE
Voltmeter
~
4A-FE
E2
EFI SYSTEM - Electronic Control System
Fl-143
Ohmmeter
(b) Measure the voltage between ECU terminals VAF and
E2 while slowly turning idle mixture adjusting screw
first fully counterclockwise, and then fully clockwise.
(c)
Check that the voltage changes smoothly from 0 V
to
approx. 5 V.
2. INSPECT RESISTANCE OF VARIABLE RESISTOR
(a)
Disconnect the variable resistor connector.
(b) Using an ohmmeter,
measure
the resistance between
the terminals VCC and E2.
Resistance: 4 - 6 k 0