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MPI SYSTEM
Check conditions
Test
Probable causes of malfunction
Check points
specification
(or action)
Malfunction code
o After holding for 15 seconds or
Normal
o Check in accordance with the diagno-
read out
longer with the ignition switch at
sis code.
o Self diagnosis
"ON", move the ignition switch to
(Note that the diagnosis code will be
"LOCK" and disconnect the ISC
erased if there is disconnection or dam-
servo connector.
age of the engine control unit back-up
o Crank for four seconds or longer.
power-supply circuit)
o Ignition switch: "ON"
o If various diagnosis codes are output,
(Check for damage or disconnec-
the most frequent cause is damage or
tion of the injector, crank angle sen-
disconnection of the power-supply or
sor circuit and other circuits.)
ground circuit
Fuel pump
Try under both
Pinch closed
The pulsations
o Voltage is not supplied to the fuel
o Actuator test
conditions:
the return
of the fuel flow
pump.
o Item NO.7
o Engine cranking
hose.
can be fell.
1) Check the ignition switch (IG and
o Fuel pump forced
Listen close to The pump
ST)
activation
2) Check the control relay.
the fuel tank.
drive sound
can be heard.
3) Check the related circuits.
o Malfunction of the fuel pump
Crank angle sensor o Engine cranking
Cranking
Engine speed
o If the tachometer reading is 0, there is
o Service data
o Tachometer con-
speed (rpm)
(rpm)
no interruption of the ignition coil pri-
o Item No.22
nected (check, by
Approx. 200
Approx. 200
mary current
using the tacho-
1) Check the power transistor and the
meter for inter-
control circuit
ruptions of the
2) Check the ignition coil. and the coil
ignition coil
power supply circu it
primary current)
o If the multi-use tester's indicated rpm
is abnormal
1) Malfunction of the crank angle sen-
sor circuit
2) Malfunction of the crank angle sen-
sor
3) Malfunction of the timing belt
31-45
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