Ford Corsar Repair Manual page 300

I
KA24E
/
TROUBLE DIAGNOSES
Diagnostic Procedure 3
-
Unstable Idle (Cont'd)
CHECK EXHAUST GAS SENSOR.
1. See "M/R FIC MNT" in "Data
monitor" mode.
2. Maintaining engine at 2,000
rpm under no-load (engine is
warmed up sufficiently.),
check that the monitor fluctu-
ates between "LEAN" and
"RICH" more than 5 times
during 10 seconds.
RICH+LEAN+R($H+
1 time 2 times
LEAN +RICH
.......
OR
1. Set "Exhaust gas sensor
monitor" in the self-diagnostic
Mode II.
(See page ES- 123)
2. Maintaining engine at
2,000
1
rpm under no-load, check t o
make sure that ECM lamp or
RED L.E.D. on the E.C.U. goes
ON and
OFF
more than
5
times
during 10 seconds.
CHECK FOR INTAKE AIR LEAK.
When pinching blow-by hose (lowering
and repair.
the blow-by air supply), does the en-
gine speed rise?
No
(Go to
a
on next page.)