Yingang YG48Q-5A, Maintenance Manual

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YG48Q-5A Maintenance ManualEngine management system
153
B
、
Injector: leakage or not
C
、
Fuel pressure too big or not
D
、
Valve clearance is to small or not
maintenance
No Change sensor
Malfcode
：
P0201
Information
：
Injector 1 Circuit Malfunction
ITEM OPERATION RESULT NEXT STEP
1
Connect the diagnostic tool, and ignition on. Next
2
Remove the conneter of injecor 1, use multimeter to check whether the
voltage of Pin A is about 12V.
Yes Step 4
No Next
3
Check whether the connection between pin A and the main power relay is
short to gound or open.
Yes Harness issue
No Next
4
Use multimeter to measure whether the resistance between pin A and B of
the injecotr is about 10-
14 Ω @ 20
℃
No Change the injector
Yes Next
5
Use the multimeter to check whether the voltage of Pin B is about 12V.
Yes Help
No Next
6
Check whether the connection between pin B of the injector and J2-05 of
the ECU is open or short to battery/ground.
Yes Harness issue
No Help
Malfcode
：
P0230/P0232
Information
：
FPR Coil Circuit Low/High Voltage or Open
ITEM OPERATION RESULT NEXT STEP
1 Connect the diagnostic tool, and ignition off next
2 Wait about 30s. Remove the fuel pump realy, ignition on. Check whether
voltage of the relay feeder ear is about 12V
Yes Change the pump
No Next
3 Check whether the feeder ear is short to ground or open. Yes Harness issue
No Help
Malfcode
：
P0351
Information
：
Cylinder 1 Ignition Coil Malfunction
ITEM OPERATION RESULT NEXT STEP
1 Connect the diagnostic tool, and ignition on. next
2 Remove the connector and check whether the voltage of pin + is about 12V. Yes Step 4
No Next
3 Check whether the connection of the pin + and main power relay is open or
short to ground.
Yes Harness issue
No Next
4 Use multimeter to check wheter the resistance of the two coil pins is
0.5-
0.65Ω @20 ℃
Yes Change coil
No Next
5 Use multimeter to check whether the voltage of pin B is about 12V. Yes Help
No Next
6 Check whether the connection of pin 2 of the coil and J2-01 of ECU is open
or shor to battery/ground.
Yes Harness issue
No Help
Malfcode
：
P0505
Information
：
Idle Speed Control Error
ITEM OPERATION RESULT NEXT STEP
1 Connect the diagnostic tool, and ignition off next