Suzuki DF70A Service Manual page 64

1A-12 Engine General Information and Diagnosis:
Failed Item
Neutral switch
Rectifier/Regulator
(Over-charging)
Oil pressure switch
Trim sensor
Fail-Safe System Description
The fail-safe system is closely related to the self-diagnostic system.
When an abnormality occurs in a sensor signal, the ECM ignores the out-of-range signal and assumes a pre-
programmed value for the failed sensors.
This allows the engine to continue running under the fail-safe condition.
Pre-Programmed Value for Fail-Safe System
Failed Item
MAP sensor 1
Air intake system
Cylinder temp. sensor
IAT sensor
Exhaust manifold temp. sensor
Throttle position sensor
Shift position sensor
Trim sensor
NOTE
There is no back-up system for the ECM itself. The engine will stop if it has failed.
• While the shift sensor outputs a forward or reverse signal, the ECM
receives a neutral signal from the neutral switch.
• Receiving 16 volts or higher signal.
• While the engine is stopped and the ignition switch is on, the ECM receives
an "off" signal from the oil pressure switch.
• Receiving an out of range "0.2 – 4.8 V" signal.
• 150 – 758 mmHg / (5.9 – 30 inHg.)
(The value will change according to the current engine speed.)
• The control is executed with the maximum engine speed of 2 000 r/min.
60 °C (140 °F)
45 °C (113 °F)
60 °C (140 °F)
• The control is executed with the throttle opening at 5 degrees.
• The shift position (Fwd / Neu / Rev) is detected with the neutral switch signal.
• The control is continued with fixed sensor output as 3.5 V.
Condition
Pre-Programmed Value
Z9J0111101005