Service Repair Manual

MPI SYSTEM
Check points
Check conditions
Test
specification
Probable cause of malfunction
Intake-air temper- o Ignition switch: Air temperature Temperature
o Malfunction of the intake-air tem-
ature sensor
ON, or engine °C (°F)
°C (°F)
perature or related circuit
o Service data
running
o Item No.13
-20 (-4)
-20 (-4)
0 (32)
0 (32)
20 (68)
20 (68)
40 (104)
40 (104)
80 (176)
80 (176)
o Ignition switch:
Warm by using Increases
ON
a hair dryer or
other method.
Throttle-position
sensor
o Service data
o Item No.14
o Hold for 15 Throttle valve
Voltage (mV)
o Throttle position sensor misadjusted
seconds or
longer with the
Idle position
480-520
o Throttle position sensor or related
circuit malfunction
ignition switch Opens slowly.
Becomes
at “ON”.
higher in
proportion to
valve opening
Motor position
sensor
o Service data
o Item No.1 5
Fully open
4,500-5,500
o Engine: Idle
Engine
Voltage (mV)
o If the voltage is low, check whether
after warm-up
condition
or not there is air intake.
(The idle posi-
tion switch
Idle (700 rpm)
500-1,300
o If the voltage is high, the probable
cause is:
must be ON.) 1) Deposits adhered to the throttle
valve
2) Increased engine resistance
o If the voltage or idling speed is
abnormal even though each part of
the engine is normal, the probable
cause is:
1) Improper adjustment of the idle
speed control and/or the throttle
position sensor
2) Malfunction of the motor posi-
tion sensor or the related circuit.
31-39