240 L4-2127cc 2.1L SOHC B21F (1982)
CHECK CO-ADJUSTMENT SCREW
1.
Turn ignition ON.
2.
Connect a voltmeter between terminal 14 at LH control unit connector and ground.
Meter should show 0 to 2.6 volts, depending on CO-screw position.
0.0 volts = max. lean
2.6 volts = max. rich
3.
Turn screw on air mass meter and check if voltage changes.
If no voltage or no variation when screw is turned, check wiring continuity.
NOTE: Adjustment screw must be resealed after adjustment.
CHECK AIR MASS METER OUTPUT
1.
Turn ignition ON.
2.
Connect a voltmeter between terminal 7 at the LH control unit connector and ground.
Meter should show 1.6 volts.
3.
START engine and warm up to operating temperature (AC off).
4.
Check output at idle (750 rpm).
