Fail-Safe Function Table - Suzuki Intruder VZ1500 Service Manual

1A-21 Engine General Information and Diagnosis:

Fail-Safe Function Table

FI system is provided with fail-safe function to allow the engine to start and the motorcycle to run in a minimum
performance necessary even under malfunction condition.
Item
IAP sensor
TP sensor
ECT sensor
IAT sensor
Ignition signal
STV actuator
STP sensor
Gear position signal
HO2 sensor (E-02, 19, 24, 33)
PAIR control solenoid valve
ISC valve
EVAP system purge control
solenoid valve (E-33 only)
The engine can start and can run even if the signal in the table is not received from each sensor. But, the engine
running condition is not complete, providing only emergency help (by fail-safe circuit). In this case, it is necessary to
bring the motorcycle to the workshop for complete repair.
When two ignition signals or two injector signals are not received by ECM, the fail-safe circuit can not work and ignition
or injection is stopped.
Fail-Safe Mode
Intake air pressure value is fixed to 101 kPa
(760 mmHg).
The throttle opening value is fixed to full
open position.
Engine coolant temperature value is fixed to
70 °C (158 °F).
Cooling fan is fixed on position.
Intake air temperature value is fixed to 25 °C
(77 °F).
#1 fuel-cut
#2 fuel-cut
When motor disconnection or lock occurs,
power from ECM is shut off.
Secondary throttle valve is stopped.
Gear position signal is fixed to 4th gear.
Feedback compensation is inhibited. (Air/
fuel ratio is fixed to normal.)
ECM stops controlling PAIR control solenoid
valve.
When motor disconnection or lock occurs,
power from ECM is shut off.
ECM stops controlling EVAP system purge
control solenoid valve.
Starting Ability Running Ability
"YES"
"YES"
"YES"
"YES"
"YES"
#2 cylinder can run.
"YES"
#1 cylinder can run.
"YES"
"YES"
"YES"
"YES"
"YES"
"YES"
"YES"
B940H21104007
"YES"
"YES"
"YES"
"YES"
"YES"
"YES"
"YES"
"YES"
"YES"
"YES"
"YES"
"YES"
"YES"