Great Wall GW491QE, Руководство по обслуживанию

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EF.1-53
M7.9.7 system service &diagnosis flow process based on fault code
2.M7.9.7 system service &diagnosis flow process based on fault code
Fault code
：
P0107“the signal voltage in the loop of inlet-air pressure sensor is too low”
S.N. Operation steps
Check
result
Follow-up steps
1 Connect with the diagnosis instrument, and place the ignition switch to the ON
”
position. Next step.
Yes Continue to proceed until step 5.
2
Observe whether the item inlet air pressure
”
in data stream is about 101kpa (specific data
depends on the existing pressure). No
Next step.
Yes Continue to proceed until step 5.
3
Pull out the plug of inlet-air pressure sensor from wiring harness, and a multimeter may be
used to check whether the voltage between Pin 3 and Pin 1 of plug is about 5V. No
Next step.
Yes
Repair or change the wiring
harness.
4
Check whether respective loops between Pin 17/33/37 of ECU and the connection Pin 1/3/4 of
sensor are short circuit to ground.
No
Next step.
Yes Diagnosis help.
5
Start the engine and have it running at idle-speed; Step on the gas slowly until it’s full opened
and observe the change of value at item inlet-air pressure
”
on diagnosis instrument, the
displayed value shall be with slight changes; Step on the gas quickly until it’s close to a full
open degree, the displayed value shall reach a value greater than 90kpa instantaneously.
No
Change the sensor.
Fault code
：
P0108 “the signal voltage in the loop of inlet-air pressure sensor is too high
”
S.N. Operation steps
Check
result
Follow-up steps
1 Connect with the diagnosis instrument, and place the ignition switch to the ON
”
position. Next step.
Yes Continue to proceed until step 5.
2
Observe whether the item “inlet-air pressure” within data stream is about 101kpa (exact data is
subject to the existing pressure).
No Next step.
Yes Continue to proceed until step 5.
3
Pull out the plug of inlet-air pressure sensor from wiring harness, and a multimeter may be
used to check whether the voltage between Pin 3 and Pin 1 of plug is about 5V.
No Next step.
Yes
Repair or change the wiring
harness. 4
Check whether respective loops between Pin 17/33/37 of ECU and the connection Pin 1/3/4 of
sensor are short circuit to power supply.
No Next step.
Yes Diagnosis help.
5
Start the engine and have it running at idle-speed; Step on the gas slowly until it’s full opened
and observe the change of value at item inlet-air pressure
”
on diagnosis instrument, the
displayed value shall be with slight changes; Step on the gas quickly until it’s close to a full
open degree, the displayed value shall reach a value greater than 90kpa instantaneously.
No Change the sensor.
Fault code
：
P0112 The temperature indicated by the inlet-air temperature sensor is too low
”
S.N. Operation steps
Check
result
Follow-up steps
1 Connect with the diagnosis instrument, and place the ignition switch to the ON
”
position. Next step.
Yes Continue to proceed until step 5.
2
Observe whether the value of item inlet-air temperature
”
in data stream is fit for the
temperature inside the air-inlet pipe (specific value depends on the existing pressure). Note: If
the displayed value is always -40
℃
, it indicates a possible failure caused by a broken loop.
No Next step.
Yes Next step.
3
Pull out the plug of inlet-air temperature sensor from wiring harness, and a multimeter may be
used to check whether the resistance between Pin 1 and Pin 2 of sensor is fit for the
temperature.
No Change the sensor.
Yes Continue to proceed until step 5.
4
Pull out the plug of inlet-air temperature sensor from wiring harness, and a multimeter may be
used to check whether the voltage between Pin 1 and Pin 2 of sensor is about 5V.
No Next step.
Yes
Repair or change the wiring
harness. 5
Check whether respective loops between Pin 17 &40 of ECU and the connection Pin 1 &2 of
sensor are broken loops, or short circuit to power supply.
No Next step.
Yes Diagnosis help.
6
Start the engine and have it running at idle-speed. Observe the change of value at item inlet-air
temperature
”
displayed on diagnosis instrument, and whether the value is increased accordingly
when the engine inlet-air temperature is being increased.
No Change the sensor.
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