Suzuki AN400 Service Manual page 84

1A-21 Engine General Information and Diagnosis:
Malfunction
Detected Item
Code
C28
Secondary throttle
P1655 valve actuator
C29
STP sensor
H
P1654
L
C32
Fuel injector
P0201
C40 (P0505)
C40 (P0506)
ISC valve
C40 (P0507)
C41
Fuel pump relay
H
P0230
L
C42
Ignition switch
P1650
C44
P0130
HO2 sensor (HO2S)
C44
P0135
* : Immobilizer system is equipped model only.
Detected Failure Condition
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.
The sensor should produce following voltage.
0.35 V ≤ sensor voltage < 4.90 V
In other than the above range, C29 (P1654) is
indicated.
Sensor voltage is higher than specified value.
Sensor voltage is lower than specified value.
No injector signal is detected for 0.8 sec.
In this case, the code C32 (P0201) is
indicated.
No IAC valve voltage is supplied after starting
the engine.
Idle speed is lower than the desired idle
speed.
Idle speed is higher than the desired idle
speed.
No voltage is applied to the fuel pump,
although fuel pump relay is turned ON, or
voltage is applied to fuel pump although fuel
pump relay is turned OFF.
Voltage is applied to fuel pump although fuel
pump relay is turned OFF.
No voltage is applied to the fuel pump,
although fuel pump relay is turned ON.
Ignition switch signal is not input to the ECM.
* When the I.D. agreement is not verified.
* ECM does not receive communication signal
from the immobilizer antenna.
HO2 sensor output voltage is not input to ECM
during engine operation and running
condition.
In other than the above value, C44 (P0130) is
indicated.
The Heater can not operate so that heater
operation voltage is not supply to the oxygen
heater circuit, C44 (P0135) is indicated.
Check For
STVA motor, STVA lead wire/
coupler
STP sensor, lead wire/coupler
connection
STP sensor circuit shorted to
Vcc or ground circuit open
STP sensor circuit open or
shorted to ground or Vcc circuit
open
Primary fuel injector, wiring/
coupler connection, power
supply to the injector
IAC valve, wiring/coupler
connection
Air passage clogged
ISC valve fixed
ISC valve pre-set position is
incorrect
ISC valve is fixed
ISC valve pre-set position is
incorrect
Fuel pump relay, lead wire/
coupler connection, power
source to fuel pump relay and
fuel injectors
Fuel pump relay switch circuit
shorted to power source
Fuel pump relay (switch side)
Fuel pump relay circuit open or
short
Fuel pump relay (coil side)
Ignition switch, lead wire/
coupler, etc.
* Immobilizer/anti-theft system
HO2S lead wire/coupler
connection
Battery voltage supply to the
HO2S
HO2 sensor lead wire/coupler
connection
Battery voltage supply to the
HO2 sensor