Suzuki GF60A, Service Manual

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1A-12 Engine Control:
Fail-Safe System Description
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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
NOTE
There is no back-up system for the ECM itself. The engine will stop if it has failed.
Operating Hour Indication System Description
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When the ignition switch is initially turned “ON” (from “OFF”), the ECM tests the caution system by turning on all four
lamps in the monitor-tachometer and sounding the caution buzzer for an initial two seconds.
For the next three seconds, the ECM indicates the total operating hours, using a combination of the tachometer needle
and “REV-LIMIT” lamp flash.
NOTE
The total operating hours displayed are those of the actual engine operation, not the ignition switch
“ON” time.
Monitor-Tachometer
Failed Item Pre-Programmed Value
MAP sensor 1 • 150 – 758 mmHg / (5.9 – 30 inHg.)
(The value will change according to the current engine speed.)
Air intake system • The control is executed with the maximum engine speed of 2 000 r/min.
Cylinder temp. sensor 60 °C (140 °F)
IAT sensor 45 °C (113 °F)
Throttle position sensor • The control is executed with the throttle opening at 5 degrees.
Trim sensor • The control is continued with fixed sensor output as 3.5 V.
“A”: Needle “B”: “REV-LIMIT” lamp
“A”
“B”
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