Great Wall GW491QE, Руководство по обслуживанию

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EF.1-50
Description of the diagnosis function on M7.9.7 system failure
Description of the diagnosis function on M7.9.7 system failure
1. Record of failure information
The electronic control unit is uninterruptedly checking the sensor, actuator, relevant loops, fault indicator lamp, accumulator voltage,
or even itself; and also verifying the reliability of output signal from sensor, driving /internal signal from actuator eg.
closed-loop control, cooling-fluid temperature, knock control, rotating-speed control when at idle-speed, accumulator voltage control,
etc. . Once any failure occurs at some step, or if some signal value is unreliable, the electronic control unit will immediately set a
record of failure information in RAM failure memory. Such record is stored in a form of fault code, and displayed as per the priority
of failure display.
Depending on the frequency of display, failures may be divided into “stable failure” and “chance failure” eg. failure caused by a
short broken circuit of wiring harness, or by bad contact between connectors.
2. Three grades of failure
(a)CLASS 5
-Actions to be taken when setting the diagnosis fault code:
Once some failure displays, its corresponding fault code and relevant failure information will enter a fault codememory.
The failure will be verified after being displayed in three continuous driving cycles, but ECU will not light up the fault i n d i c a t o r
lamp.
-Condition as to eliminate the fault indicator lamp/fault code.
Upon a verification of failure, have vehicle running without failure for three continuous driving cyclestosettlethefailure.
As for verified failure, the fault code will be cleared away after 40 continuous trouble-free preheating cycles from the time of failure
settlement.
As for chance failure, the fault code will be cleared away after 40 continuous trouble-free preheating cycles.
(b)CLASS 31
-Actions to be taken when setting the diagnosis fault code:
Once some failure displays, its corresponding fault code and relevant failure information will enter a fault codememory.The failure
will be verified after being displayed in three continuous driving cycles, and ECU will light up the fault indicator lamp.
-Condition as to eliminate the fault indicator lamp/fault code
When the fault indicator lamp is lighting, have vehicle running without failure for one driving cycle to settle the failure, and the fault
indicator lamp will be closed.
As for verified failure, the fault code will be cleared away after 40 continuous trouble-free preheating cycles from the time of
failure settlement.
As for chance failure, the fault code will be cleared away after 20 continuous trouble-free preheating cycles.
(c)CLASS 33
-Actions to be taken when setting the diagnosis fault code:
Once some failure displays, its corresponding fault code and relevant failure information will enter a fault code memory.
The failure will be verified in two mintues from the display moment, but ECU will not light up the fault indicator lamp.
-Condition as to eliminate the fault indicator lamp/fault code
Upon a verification of failure, have vehicle running without failure for one driving cycle to settle the failure.
As for verified failure, the fault code will be cleared away after 40 continuous trouble-free preheating cycles from the time of failure
settlement.
As for chance failure, the fault code will be cleared away after 20 continuous trouble-free preheating cycles.
3. Strategy for the control of fault indicator lamp
When no failure,
-After the ignition switch is ON, the fault indicator lamp will be lighting, then off in four seconds;
-It will be started within four seconds; and the fault indicator lamp will be off after the signal to rotating-speed is found;
-When the ground connection time of line K is longer than 2.5 seconds, the fault indicator lamp will be flashing at a frequency of 2 Hz.
When with failure,
-After the ignition switch is ON, the fault indicator lamp will be always lighting;
-It will be started, and the fault indicator lamp will be off after the signal to rotating-speed is found; If the fault indicator lamp is
defined to a ‘lighting’ mode, it will be always lighting when relevant conditions are satisified;
-When the ground connection time of line K is longer than 2.5 seconds, a flashing code (ie. P-CODE value) will be output. For
instance: P0203 will be flashing in the way below: ten continuous times- intermittance- two continuous times - intermittance- ten
continuous times - intermittance- three continuous times.
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