MANUALS · FUEL [13] · страница 201 из 340 · Открыть оригинал PDF ↗

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SELF-DIAGNOSIS

Theengine control unit monitors the inputloutput
signals (some signals at all times and the others
under specified conditions) of the engine control
unit.

When it isnoticed thatan irregularity hascon-
tinued forspecified time or longer fromwhen
the irregular signal is initially monitored, passing
certain number,theenginecontrolunit judges
thatanirregularityhasoccurred, memorizes the
malfunction code ,andoutputs the signalto the
self-diagnosis output terminals
Thereare15 diagnosis items, including thenor-
mal state,and the diagnosis results canbe read
out witha multi-use tester
Moreover ,since memorization of the malfunction
codes isbackedup directly bythe battery, the
diagnosis results are memorized even if the igni-
tionkeyisturnedoff.Themalfunctioncodes
will,however,be erasedwhen the batteryter-
minal or the engine control unit connector is dis-
connected:

Caution

If the sensor connector is disconnected while
theignitionswitchisON,themalfunction
codeismemorizedIn this instance,either
sendthemalfunction-code-erasesignal from
themulti-usetestertotheenginecontrol
unit, the diagnosis memory will be erased:
The15 diagnosis items are provided as follows,
and if plural items are activated,theyare all indi-
cated' sequentially from the smallest codenum-
ber.

Caution

Ignition timing adjustment signal malfunction
codeis outputwhenthe ignition timing ad-
justment terminal line is short-circuited to the
earth:Therefore, the malfunction code is out-
put when the ignition timing adjustment ter-
minal is earthed, however, this is notmal-
function.

The malfunction codes are also erased by setting
the ignition switch to theON"position and then
sendingthemalfunction-code-erasesignalfrom
the multi-use tester to the engine control unit:

DIAGNOSIS CHART

Таблица в оригинале

Распознанный текст таблицы — требует сверки с оригиналом

Output reference	Diagnosis item	Diag	nosis code	Check item (Remedy)
p order		No_	Memory
	Engine control unit			(Replace engine control unit)
	Oxygen sensor	11	Retained	Harness and connector Oxygen sensor Fuel pressure Injectors (Replace if defective ) Intake air leaks
	Air flow sensor	12	Retained	Harness and connector (Ilf harness and connector are normal, replace air flow sensor assembly)
	Intake air temperature sensor	13	Retained	Harness and connector Intake air temperature sensor
	Throttle position sensor	14	Retained	Harness and connector Throttle position sensor Idle position switch

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