c) Engine trouble light- influences the system in fault warning.
d) Storage battery voltage- judges whether the battery power is adequate.
e) According to the experience, judge whether the readings of coolant temperature sensor,
air intake temperature sensor, manifold absolute pressure sensor and oxygen sensor
are normal.
f) Working range of throttle position sensor- Failure in completely turning on or off the
sensor may influence the power performance of the engine and part of system
function.
17.4.2.2
Step Two
Check whether the power supply of ECU is cut off- the communication between the diagnostic
apparatus and the system halts after turning off the key switch.
17.4.2.3
Step Three
a) Coolant temperature and its cycling- indicate whether the thermostat operates normally.
b) Storage battery voltage- shows whether the generator works
normally. Too high: maybe a fault in the generator regulator.
Too low：maybe the inappropriate connection of generator wires or a fault in the generator
c) Manifold air pressure- may indicate whether there is an intake air leak or an air valve clearance
The air valve clearance is too small: the over high figure may influence the power performance of
the engine. Meanwhile, because the exhaust valve opens too early, the increased temperature
of the exhausted air will significantly reduce the service lives of oxygen sensor and ternary
catalytic converter.
The air valve clearance is too large: may cause the manifold air pressure become low, thus
influencing the system in judging the engine's operation and leading to abnormal idling in the
engine's warming-up.
Besides, the clogged exhaust system, e.g., foreign materials in the exhaust passage, or the
blocked ternary catalytic converter caused by the over-consumption of the engine oil, or
damaged pieces inside of the ternary catalytic converter, will lead to an over high figure.
d) Cycle number of the oxygen sensor reading- a small cycle number indicates the failure of
the oxygen sensor.
17.4.3 Concise Fault Removal Techniques
Please take the following steps to repair the electronic control injection system. If the fault is
removed in a certain step, the following steps can be suspended. Then check and remove the
fault code by diagnostic apparatus in compliance with the term 14.4.2.
When using the diagnostic apparatus, the storage battery voltage cannot be lower than 8.5V.
17.4.3.1
Daily Use and Maintenance
Unleaded gasoline #91 or higher is strongly recommended.
Though ECU is damp-proof, it is forbidden to wash its cover with a high-pressure water gun.
The fuel filter should be replaced every 7,000-10,000km
In common circumstances, the throttle valve should be washed every 10,000km or every 1
year.
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