MARUTI SUZUKI 800, Руководство по обслуживанию

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6E1-24 ENGINE AND EMISSION CONTROL SYSTEM
CODE NO.14 (P0130) OXYGEN SENSOR CIRCUIT
(SIGNAL VOLTAGE DOESN’T CHANGE)
NOTE:
Before diagnosing trouble according to flow table
given below, check to make sure that following sys-
tem and parts other than Electronic Fuel Injection
system are in good condition.
– Air cleaner (clogged)
– Vacuum leaks (air inhaling)
– Spark plugs (contamination, gap)
– High-tension cords (crack, deterioration)
– Ignition timing
– Engine compression
– Any other system and parts which might affect A / F
mixture or combustion.
If code No.14 (P0130) and another code No. are indi-
cated together, the latter has priority. Therefore,
check and correct what is represented by that code
No. first and then proceed to the following check.
Be sure to use a voltmeter with high impedance
(M
/ V minimum) or digital type voltmeter for accu-
rate measurement.
1. ECM
2. Oxygen sensor
3. Coupler
STEP ACTION YES NO
1
1) Warm up engine to normal operat-
ing temperature.
2) Connect voltmeter between
E33-213 terminal of ECM coupler
and body ground.
3) Maintain engine speed at 2000 rpm
and after 60 seconds, check volt-
meter.
Does the voltage deflect between
above and below 0.45 V repeatedly?
Oxygen sensor and its circuit (closed
loop system, A/F ratio feed back sys-
tem) are in good condition.
Intermittent trouble or faulty ECM.
Recheck, referring to INTERMITTENT
AND POOR CONNECTION in SEC-
TION 0A.
Go to Step 2.
2
Does the voltage remain unchanged at
0.45 V above?
“W” circuit shorted to power circuit or
rich A/F mixture.
If circuit is OK, check MAP sensor,
ECT sensor, fuel pressure, injectors
and their circuit. If all above are OK,
check ECM and its circuit.
Go to Step 3.
3 1) Maintain engine speed at 2000 rpm
for 60 seconds.
2) Check voltmeter while repeating
racing engine.
Does it indicate 0.45 V or more even
once?
Poor E33-213 connection or lean A/F
mixture.
If connection is OK, check MAP sen-
sor, ECT sensor, fuel pressure, injec-
tors and their circuit.
If all above are OK, check ECM and its
circuit.
“W” circuit open/short
or oxygen sensor mal-
function.
If wire and connection
are OK, replace oxy-
gen sensor and re-
check.