1989-Mitsu-Factory Manual · mpi system · страница 22 из 48 · Открыть оригинал PDF ↗
SELF-DIAGNOSIS
The engine control unit monitors the input/output
signals (some signals at all times and the others
under specified conditions) of the engine control
unit.
When it is noticed that an irregularity has continued
for a specified time or longer from when the ir-
regular signal is initially monitored, passing a certain
number, the engine control unit judges that an ir-
regularity has occurred, memorizes the trouble
code, and outputs the signal to the self-diagnosis
output terminal.
There are 12 diagnosis items, and the diagnosis
results can be read out with a voltmeter or multi-use
tester.
Moreover, since memorization of the trouble codes
is backed up directly by the battery, the diagnosis
results are memorized even if the ignition key is
turned off. The trouble codes will, however, be
erased when the battery terminal or the engine con-
trol unit connector is disconnected.
Caution
If the sensor connector is disconnected with the
ignition switch turned on, the diagnosis code is
memorized. In this case, disconnect the battery
terminal (-) for 10 seconds or more, and the
diagnosis memory will be erased.
The 12 diagnosis items are provided as follows, and
if plural items are activated, they are all indicated
sequentially from the smallest code number.
| Diagnosis item | Malfunc- I tion code | I Diagnosis item | |
|---|---|---|---|
| I 11 | I Oxygen sensor | I 23 | I Top dead center sensor I |
| 12 | Air-flow sensor | 24 | Vehicle-speed reed switch |
| 13 | Intake air temperature sensor | 25 | Barometric pressure sensor |
| 14 | Throttle position sensor | 41 | Injector |
| 21 | Engine coolant tempemture sensor | 42 | Fuel pump |
| I 22 | I Crank angle sensor | 1 43 | 1 EGFi* I |
Таблица в оригинале
* The diagnosis item marked * is applicable to vehicles for California only.
CHECK PROCEDURE (SELF-DIAGNOSIS) NUFlXE Precautions for operation
(1) When battery voltage is low, no detection of failure is
possible. Be sure to check the battery for voltage and
other conditions before starting the test.
(2) Diagnosis item is erased if the battery or the engine
control unit connector is disconnected. Do not discon-
nect the battery before the diagnosis result is com-
pletely read.
(3) After check and correction are over, disconnect ground
cable for 10 seconds or more from negative terminal of
battery and connect lt again to make sure that failure
code is erased.
INSPECTION PROCEDURE-(USING MULTI-USE
TESTER) NMPCM
(1) Switch OFP the ignition switch.
(2) Connect the tester side connector of the multi-use tester
to the connector for diagnosis (located in the glove box
compartment).
(3) Connect the power-source terminal of the multi-use tester
to the cigarette lighter socket.
Оригинальная страница руководства
