Suzuki VLR1800, Service Manual

Page: 94 / 624

1A-25 Engine General Information and Diagnosis:
C21
IAT sensor
The sensor voltage should be the following.
0.15 V
≤
Sensor voltage < 4.85 V
In other than the above range, C21 (P0110) is
indicated.
IAT sensor, lead wire/coupler
connection
P0110
H Sensor voltage is higher than specified value.
IAT sensor circuit open or
ground circuit open
L Sensor voltage is lower than specified value.
IAT sensor circuit shorted to
ground
C23
TO sensor
The sensor voltage should be the following for
2 sec. and more, after ignition switch is turned
ON.
0.2 V
≤
Sensor voltage < 4.8 V
In other than the above value, C23 (P1651) is
indicated.
TO sensor, lead wire/coupler
connection
P1651
H Sensor voltage is higher than specified value.
TO sensor circuit shorted to
VCC or ground circuit open
L Sensor voltage is lower than specified value.
TO sensor circuit open or
shorted to ground or VCC
circuit open
C24/C25
C26/C27
Ignition signal
CKP sensor (pick-up coil) signal is produced,
but signal from ignition coil is interrupted 5
times or more continuously. In this case, the
code C24 (P0351), C25 (P0352), C26 (P0353)
or C27 (P0354) is indicated.
Ignition coil, wiring/coupler
connection, power supply from
the battery
P0351/P0352
P0353/P0354
C28
STV actuator
When no actuator control signal is supplied
from the ECM, communication signal does not
reach ECM or operation voltage does not
reach STVA motor, C28 (P1655) is indicated.
STVA can not operate properly.
STVA motor, STVA lead wire/
coupler connection
P1655
C29
STP sensor
The sensor should produce following voltage.
0.15 V
≤
Sensor voltage < 4.85 V
In other than the above range, C29 (P1654) is
indicated.
STP sensor, lead wire/coupler
connection
P1654
H Sensor voltage is higher than specified value.
STP sensor circuit shorted to
VCC or ground circuit open
L Sensor voltage is lower than specified value.
STP sensor circuit open or
shorted to ground or VCC
circuit open
C31
Gear position signal
Gear position signal voltage should be higher
than the following for 3 seconds and more.
Gear position sensor voltage
≥
0.6 V
If lower than the above value, C31 (P0705) is
indicated.
GP switch, wiring/coupler
connection, gearshift cam, etc.
P0705
C32/C33
Fuel injector
CKP sensor (pickup coil) signal is produced,
but fuel injector signal is interrupted 4 times or
more continuously. In this case, the code C32
(P0201), C33 (P0202) is indicated.
Primary fuel injector, wiring/
coupler connection, power
supply to the injector
P0201/P0202
C40/P0505
ISC valve
The circuit voltage of motor drive is unusual.
ISC valve circuit open or
shorted to ground
Power source circuit open
C40/P0506
Idle speed is lower than the desired idle
speed.
Air passage clogged
ISC valve is fixed
ISC valve preset position is
incorrect
C40/P0507
Idle speed is higher than the desired idle
speed.
ISC valve hose connection
ISC valve is fixed
ISC valve preset position is
incorrect
Malfunction
Code
Detected Item Detected Failure Condition Check For