Condition For Self-Diagnostic System Operation - Suzuki DF 40 Service Manual

CONDITION FOR SELF-DIAGNOSTIC SYSTEM OPERATION

FAILED ITEM
MAP sensor 1
CKP sensor
IAC valve / By-pass air screw
adjustment
CMP sensor
CTP switch
Cylinder temp. sensor
IAT sensor
MAP sensor 2
(Sensor hose)
Rectifier & regulator
(Over-charging )
Exhaust manifold temp, sensor • No signal
[NOTE 1]
These conditions will be caused by IAC valve failure or incorrect by-pass air screw adjustment. If IAC valve
is always closed or by-pass air is too low, the ECM controls the IAC valve duty to increase to maintain the
idling/trolling speed specified.
Conversely, if IAC valve is always opened or by -pass air is too high, the ECM controls the IAC valve duty to
decrease to maintain the idling / trolling speed specified.
[NOTE 2]
This condition will be caused by disconnected, kinked or clogged MAP sensor hose or clogged inlet mani-
fold gas filter.
• No signal (With engine running)
• Receiving an out of range "37 – 860 mmHg (0.50 – 4.84V)"
signal ( With engine running )
• No signal from any CKP sensors while receiving 8 signals from other
CKP sensors.
• No signal from one CKP sensor while receiving 6 signals from CMP
sensor. (One CKP sensor fail)
• IAC valve operates at 90% duty or higher when CTP switch is "ON"
• IAC valve operates at 10% duty or lower when CTP switch is "ON"
[NOTE 1]
• No signal while receiving 12 signals from CKP sensors
• Receiving "ON" signal when engine speed is 2500 r/ min or higher and
intake manifold pressure is 380 mmHg or higher.
• No signal
• Receiving an out of range "– 46 to +170 °C (0.10 – 4.84 V)" signal
• No signal
• Receiving an out of range "– 46 to +169 °C ( 0.10 – 4.88V)" signal
• Receiving unchanging signal regardless engine speed change
[NOTE 2]
• Receiving 16 volts or higher signal
• Receiving an out of range "– 46 to +170 °C (0.10 – 4.84V)" signal
ENGINE CONTROL SYSTEM
CONDITION
3-28