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FI
SYSTEM
DIAGNOSIS
4-25
MALFUNCTION
DETECTED ITEM
DETECTED FAILURE CONDITION
CODE
CHECK FOR
Secondary throttle When no actuator control signal is supplied from the ECM or
valve actuator
communication signal does not reach ECM or operation voltage
C28
does not reach STVA motor, C28 is indicated. STVA can not
operate.
STVA lead wire/coupler.
Secondary throttle
The sensor should produce following voltage.
position sensor
0.15 V
~
sensor voltage < 4.85 V
C29
Without the above value, C29 is indicated.
Secondary throttle position sensor, lead wire/coupler connec-
tion.
Gear position signal Gear position signal voltage should be higher than the following
for 3 seconds and more.
C31
(Gear position sensor
voltage>
0.6 V)
Without the above value, C31 is indicated.
Gear position sensor, wiring/coupler connection. Gearshift cam
etc.
Fuel injector
Crankshaft position sensor (pickup coil) signal is produced, but
C32/C33 fuel injector signal is interrupted continuous by 4 times or more.
C34/C35 In this case, the code C24, C25, C26 or C27 is indicated.
Injector, wiring/coupler connection, power supply to the injector.
Fuel pump relay No voltage is applied to the fuel pump, although fuel pump relay
is turned ON, or voltage is applied to fuel pump although fuel
C41
pump relay is turned OFF.
Fuel pump relay, connecting lead wire, power source to fuel
pump relay, fuel injectors.
C42
Ignition switch Ignition switch signal is not input in ECM.
Ignition switch, lead wire/coupler.
Exhaust control valve EXCVA position sensor produces following voltage.
actuator
0.1 V
~
sensor voltage < 4.9 V
C46
Without the above value, C46 is indicated. EXCVA motor can
not move.
EXCVA, EXCVA adjustment, lead wire/coupler.