Yingang YG48Q-5A, Maintenance Manual

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YG48Q-5A Maintenance ManualEngine management system
150
Tachometer
P1693 Tachometer Circuit Low Voltage KsDGDM_TAC_Circuit_Low
P1694 Tachometer Circuit High Voltage KsDGDM_TAC_Circuit_High
Malfcode
：
P0107
Information
：
MAP Circuit Low Voltage or Open
ITEM OPERATION RESULT NEXT STEP
1 Connect the diagnostic tool, and ignition on. Next
2 Check the data of
‘BARO’. Make sure whether it is about 100kPa
(depending on where you are)
Yes Step 5
No Next
3 Remove the connector, and use the multimeter to check whether the
voltage between pin B and D is about 5V.
Yes Setp 5
No Next
4 Check whether the following pins is short to ground: J2-11, J2-10,
J2-16 of the ECU and pin A, D, B of the connector.
Yes Check the harness
No Next
5 Crank the engine to stay at idle. Check whether the MAP is abou
30-50kPa. Then go to WOT, check whether the MAP goes to about
90kPa.
Yes Diagnotic help
No Change the sensor
Malfcode
：
P0108
Information
：
MAP Circuit High Voltage
Malfcode
：
P0112
Information
：
IAT Circuit Low Voltage
ITEM OPERATION RESULT NEXT STEP
1 Connect the diagnostic tool, and ignition on. Next
2
check whether the data of
‘intake air temperature’ equals to the real
intake air temperature.
Yes Setp 5
No Next
3 Remove the connector, and use the multimeter to check whether the
resistance between pin B and D is reasonable according to the
temperature.
Yes Step 5
No Next
4 Remove the connector and check whether the voltage between pin
B and D is about 5V.
Yes Next
No Check harness
5 Check whether the following pins are short battery: J2-8, J2-10 of
the ECU and pin C, D of the connector.
Yes Change the harness
No Next
6
Crank the engine and stay idle. Check whether the ‘intake air
temperature’ goes up when the engine temperature goes up.
Yes Help
No Change the sensor.
ITEM OPERATION RESULT NEXT STEP
1 Connect the diagnostic tool, and ignition on. Next
2 Check the data of
‘BARO’. Make sure whether it is about 100kPa
(depending on where you are)
Yes Step 5
No next
3 Remove the connector, and use the multimeter to check whether the
voltage between pin B and D is about 5V.
Yes Setp 5
No Next
4 Check whether the following pins is short to battery: J2-11, J2-10,
J2-16 of the ECU and pin A, D, B of the connector.
Yes Check the harness
No Next
5
Crank the engine to stay at idle. Check whether the MAP is abou
30-50kPa. Then go to WOT, check whether the MAP goes to about
90kPa.
Yes Diagnotic help
No Change the sensor