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IDLE SPEED/IGNITION TIMING/IDLE MIXTURE RATIO INSPECTION
PREPARATION
2. On air conditioner equipped models, checks
1. Make sure that the following parts are in good
should be carried out while the air condi-
order.
tioner is "OFF".
a
Battery
3. On automatic transaxle equipped models,
a
Ignition system
when checking idle rpm, ignition timing and
a
Engine oil and coolant levels
mixture ratio, checks should be carried out
a
Fuses
while shift lever is in "NW position.
4. When measuring "CO"
percentage, insert
a
E.C.U. harness connector
probe more than 40 cm (15.7 in) into tail pipe.
a
Vacuum hoses
WARNING:
a
Air intake system
a. When checking or adjustment, move selector
(Oil filler cap, oil level gauge, etc.)
lever to "N" position, set parking brake and
a
Fuel pressure
chock rear wheels.
a
Engine compression
b. After the adjustment has been made, remove
C.C.P. control valve operation
wheel chocks.
a
Throttle valve and idle switch
Overall lnspectlon sequence
INSPECTION START
1
Perform self-diagnosis.
Repair or replace.
ignition timing.
Check exhaust gas sensor
L
'.G
Check exhaust gas sensor
function by using E.C.U. inspec-
tion lamp.
A 1
4
Check base idle CO.
N.G.
O.K.
Replace exhaust gas sensor.
Check emission control parts
Check exhaust gas sensor
and repair or replace if
function.
necessary.
O.K.
l
L*O
O.K.
harness.
Check E.C.U. function* by
substituting another known
good E.C.U.
O.K.
*:
E.C.U. may be the cause of a
N.G.
v
problem, but this is rarely
INSPECTION END
the case.
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