JAC S2. Engine. Instruction — part 18
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Ignition switch is ON (does not start), MIL keeps lightening;
After 3s starting the engine, if there is no fault request to light MIL in fault storage, MIL will die out.
If there is fault requests to light MIL in fault storage or from outside of ECM, MIL will be lighted up.
When there is request from outside of ECM or get fire or from fault storage, MIL will glitter with 1HZ
frequency.
4. Trouble shooting steps:
1). Connect the diagnostic tester with diagnostic connectors, then turn on the tester.
2). 。 Turn on the ignition switch.
3). Read relative information (fault code, freeze frame); consult the service book to confirm faulted
components and type; make service proposal according to information and experience.
4). Shoot the trouble.
5). Eliminate fault storage; appropriately drive the vehicle under the condition which meets corresponding
fault diagnosis; read fault info to make sure the fault is solved.
5. Instruction of detection and diagnosis equipment
Maintenance mode of electronic control system is quite different with mechanical system; it relies on electric
equipment and use OBD system to do trouble shooting. Normal equipments used in electronic control system
include auto computer detector, digital multimeter and etc.
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You can build connection with ECM by connect the computer detector with diagnostic socket, and visit
relative fault diagnosis data in ECM storage, including fault code and data flow, in order to know the monitoring
results and system working situation which will provide evidence for trouble shooting. Besides, it also can do
movement test.
(1)Read and eliminate fault code
You can easily read fault code stored in ECM by connect the computer detector with diagnostic socket. The
computer detector will display the code and its meaning on screen. By reading the code, serviceman can handle
faults like short circuit and open circuit of most sensors and controlling circuits in electronic control system.
(2)Read data flow
Connect the computer detector and electronic control system to read ECM working situation and transient data
of input, output signal (signal of sensors, calculation results of ECM, controlling modes, control signal transmitted
to actuators and etc.). Serviceman can judge if the system works normally according to changes of different datas,
or compare the signal value under specified conditions to standard value, in order to correctly judge the type
and position of fault.
(3)Movement test
Movement test: Computer detector gives commands to ECM to drive or stop some work of actuators, for
detecting actuator’s working condition and finding the faulted actuators or controlling circuits.
6. ECU common fault code and instruction
Lighting principles of MIL and SVS: different set of fault types will have different lighting timing and method. And
the fault types can be classified as A, B, C, D, E and Z by degree of influence on exhaust emission, the definition
and lightening rules are as followed:
MIL (relative components of exhaust control) activation rules:
A: as long as the fault occurs, system will light up MIL and record fault code
B: only when the fault occurred in consecutive two emission monitoring
process, system will light up MIL and record fault code
E: only when the fault occurred in consecutive three emission monitoring
process, system will light up MIL and record fault code
Notice A emission monitoring process is a working cycle that all OBD functional tests can be done. It is
also based on EⅢ emission test program.
SVS (relative components of exhaust control) activation rules:
C: record the fault code when it occurred, and light up SVS
indicator light, but not the MIL.
Z: fault diagnosis system didn’t do any analysis to this type of
faults
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(II)Diagnostic analysis table
No.
Fault
Analysis of reason
How to solve
1
engine
cannot start
no oil in tank
add some
oil pump does not work
check the circuit; change the oil pump if necessary
oil injector dose not work
check the circuit; change the oil pump if necessary
ignition system does not work
check the ignition system
oil pressure is too low
check the oil pipes and oil pump
ignition angle of advance is wrong Check VVT and OCV to see if they need any
change
high pressure spark is too weak
change the sparking plug
leakage of oil injector
change the oil injector
ECM does not work
change the ECM
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No. Fault
Analysis of reason
How to solve
2
Engine
is
hard to start
oil pressure is too low
check the oil pipes and oil pump
water temperature sensor has fault change a sensor
leakage of oil injector
change the oil injector
oil injector is plugged
clean the oil injector, or change it if necessary
ignition timing is abnormal
check the OCV; change it if necessary
bad performance of ignition plug
and ignition coil
change the ignition plug and ignition coil
harness of power supply has fault chaeck the harness
pressure of cylinder is too low
check the pressure of cylinder, if the pressure is
lower than 1.1Mpa, that means there is fault
and you should disassemble and check the
engine
ECM does not work
change the ECM
3
idle speed is
not stable
oil pressure is too low
check the oil pressure, if it’s too low, please
check if the oil pump works normally or the oil
filter be plugged
bad atomization, leakage or block
of oil injector
change the oil injector
bad performance of ignition plug check if the ignition plug is too old or has
serious carbon deposition or the clearance is
too big; and change it if necessary
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inlet air temperature pressure
sensor has fault
change the inlet air temperature pressure
sensor
canister purge solenoid works in
idle speed
check the canister purge solenoid if necessary
air pressure is too low in cylinder
or the difference of pressure in
each cylinder is too big
check the pressure of cylinder, if the pressure is
lower than 1.1Mpa, that means there is fault
and you should disassemble and check the
engine
4
Rotate
speed of idle
speed is too
high
throttle fault
change the throttle
leakage of air inlet pipe
tightening some parts
accelerator pedal fault
change the accelerator pedal
water temperature sensor fault
change the water temperature sensor
canister purge solenoid fault
change the canister purge solenoid
5
怠 速 转 速 波
动过 大
bad atomization or block of oil
injector
change the oil injector
bad performance of ignition plug change the ignition plug
signal of water temperature sensor
is wrong
change the water temperature sensor
oxygen sensor fault
change the oxygen sensor
electronic throttle or control circuit
fault
change the electronic throttle
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No. Fault
Analysis of reason
How to solve
6
vehicle will
easily be shut
down in idle
speed
ignition system does not work
normally
读取, check related parts according to fault
codes
oil system does not work normally check oil pressure, if it is
abnormal, please check related
parts of oil system
electronic throttle fault
change the electronic throttle
bad contact of harness connector
in controlling system
tightening the harness connector
of controlling sytem
7
动力不足 lack of
power
block of air filter
clean the air filter
drop at joints of air inlet pipes
solve the drop problem
electronic throttle fault
change the electronic throttle
oil pressure is too low
check the oil pipes and oil pump;
change it if necessary
bad atomization or block of oil
injector
check oil injector to see if there
are faults like serious carbon
deposition; change it if necessary
water temperature sensor fault
change the water temperature
sensor
fault of inlet air temperature
pressure sensor
change the inlet air temperature
pressure sensor
ignition timing is wrong
check OCV; change it if necessary
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pressure in cylinder is abnormal
check the pressure of cylinder, if
the pressure is lower than 1.1Mpa,
that means there is fault and you
should disassemble and check the
engine
(III)Fault-diagnosis flow chart
Begin to check
1. Get the information
about the fault and
ask the customer for
2. Check and print
DTC; freeze frame data
and check related
3. Confirm the fault and
try to make the
diagnosis based on
4Customer described
the fault; does the
instrument showed
Ye
No
4. Confirm the fault and
try to make the
diagnosis based on
Yes
No
Customer didn’t describe the fault, but
the instrument showed DTC
5. Carry out
steps DTC
Use fault
diagnostic unit
6. Do basic
checks
9. Check fault system
through fault symptom
7. Run the fault-
diagnosis checking
No
Yes
10. Check the
faulted
components based
Find the faulted
components or not
No
No
Beyond the
technical scope or
8. Check the
faulted
Yes
11. Repair or change the
Yes
Abnormal (the fault
still exists)
Abnormal (the fault
still exists)
12. Final check
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(IV)Fault Code Table
Overview
1、 Instruction
1) Unless it is confirmed to be steady state fault, the following service can be started, or it may cause
false diagnosis.
2) The ‘multimeter’ mentioned in the following means digital multimeter. DO NOT use pointer
multimeter to check circuits of electronic control system.
3) If you are checking a vehicle with anti-theft system, and have to change ECM in ‘next steps’, please
pay attention to do matching work after the change.
4) If the fault code says the circuit has too-low voltage, that may implies that there is short circuit or open
circuit in this circuit; if the fault code says the circuit has too-high voltage, that may implies that there is
short circuit to power in this circuit; if the fault code says it’s circuit fault, that may implies that there is
open circuit or multi-fault in this circuit.
2、Diagnosis support
1) If the fault code cannot be eliminated, that is steady state fault; if it is occational fault, you shoud
mainly check whether the connectors are loosen up.
2) During the service, please also pay attention to the Influence of vehicle maintenance condition,
cylinder pressure and mechanical ignition timing on the system.
3、Fault Code Diagnosis
ECM pins mentioned in the following should be subjected to practical wiring diagram.
4、MT22.1 ECM controlling system common fault code sheet
No. Fault code
Fault code information
Type of
fault
1
P 0012
big phase error of air inlet VCP camshaft
E
2
P 0016
learning deviation of air inlet VCP cam wheel is out of range
A
3
P 0026
vise of air inlet VCP hydraulic control valve
E
4
P 0031
front oxygen sensor heater short-circuit to low voltage
A
5
P 0032
front oxygen sensor heater short-circuit to high voltage
A
6
P 0037
rear oxygen sensor heater short-circuit to low voltage
A
7
P 0038
rear oxygen sensor heater short-circuit to high voltage
A
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8
P 0068
electronic throttle valve air mass flow fault
A
9
P 0076
low voltage or open circuit of air inlet VCP hydraulic control valve coil
A
1
0
P 0077
high voltage of air inlet VCP hydraulic control valve coil
A
1
1
P 0105
signal vise of air inlet pressure sensor
E
1
2
P 0106
inlet air pressure/accelerator pedal position
E
1
3
P 0107
low voltage circuit or open circuit of inlet air pressure sensor
A
1
4
P 0108
high voltage circuit of inlet air pressure sensor
A
1
5
P 0112
ow voltagecircuit l of inlet air temperature sensor
E
1
6
P 0113
high voltage or open circuit of inlet air temperature sensor
E
1
7
P 0117
low voltage circuit of coolant temperature sensor
E
1
8
P 0118
high voltage or open circuit of coolant temperature sensor
E
1
9
P 0122
low voltage circuit of electronic throttle valve position sensor 1#
A
2
0
P 0123
high voltage circuit of electronic throttle valve position sensor 1#
A
2
1
P 0131
front oxygen sensor short-circuit to low voltage
E
2
2
P 0132
front oxygen sensor short-circuit to high voltage
E
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No.
Fault code
Fault code information
Type of
fault
23
P 0133
too-low reacting of front oxygen sensor
E
24
P 0134
short-circuit of front oxygen sensor
A
25
P 0137
rear oxygen sensor short-circuit to low voltage
E
26
P 0138
rear oxygen sensor short-circuit to high voltage
E
27
P 0140
short-circuit of rear oxygen sensor
E
28
P 0171
too lean of oil system under non-idle speed
E
29
P 0172
too rich of oil system under non-idle speed
E
30
P 0222
low voltage circuit of electronic throttle valve position sensor 1#
A
31
P 0223
high voltage circuit of electronic throttle valve position sensor 1#
A
32
P 0230
oil pump relay fault
A
33
P 0261
low voltage circuit fault of 1
st
cylinder nozzle
A
34
P 0262
high voltage circuit fault of 1
st
cylinder nozzle
A
35
P 0264
low voltage circuit fault of 2
nd
cylinder nozzle
A
36
P 0265
high voltage circuit fault of 2
nd
cylinder nozzle
A
37
P 0267
low voltage circuit fault of 3
rd
cylinder nozzle
A
38
P 0268
high voltage circuit fault of 3
rd
cylinder nozzle
A
39
P 0270
low voltage circuit fault of 4
th
cylinder nozzle
A
40
P 0271
high voltage circuit fault of 4
th
cylinder nozzle
A
41
P 0300
single or multi cylinders are on fire
A/B
42
P 0324
block control system fault
C
43
P 0325
block sensor fault
C
44
P 0335
no signal of circuit of crankshaft position sensor
A
45
P 0336
signal interference circuit of crankshaft position sensor
E
46
P 0340
no signal of circuit of camshaft position sensor
E
47
P 0341
fault of circuit reasonability of camshaft position sensor
E
48
P 0340
state diagnosis of air inlet VCP camshaft position sensor
A
49
P 0341
diagnosis fault of air inlet VCP target wheel
A
50
P 0351
1
st
cylinder ignition coil fault
A
51
P 0352
2
nd
cylinder ignition coil fault
A
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52
P 0353
3
rd
cylinder ignition coil fault
A
53
P 0354
4
th
cylinder ignition coil fault
A
54
P 0420
low efficiency of catalytic converter
A
55
P 0458
canister purge solenoid short-circuit to low voltage or open circuit
E
56
P 0459
canister purge solenoid short-circuit to high voltage
E
57
P 0480
low-speed fan fault
C
58
P 0481
high-speed fan fault
C
59
P 0502
no signal of speed sensor
E
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No.
Fault code
Fault code information
Type of
fault
60
P 0504
correlative fault of brake switch
C
61
P 0506
idle speed is too low
E
62
P 0507
idle speed is too high
E
63
P 0562
system voltage is too low
C
64
P 0563
system voltage is too high
C
65
P 0571
on-off state of brake light didn’t change while braking
E
66
P 0602
ECM programming error (mismatch of software version)
A
67
P 0606
ECM processor fault
A
68
P 0606
ECM processor fault
A
69
P 0606
ECM processor fault
A
70
P 0606
ECM processor fault
A
71
P 0606
ECM processor fault
A
72
P 060A
ECM processor fault
A
73
P 060A
ECM processor fault
A
74
P 060A
ECM processor fault
A
75
P 0616
low voltage of starter relay
A
76
P 0617
high voltage of starter relay
A
77
P 0633
non-learning fault of burglar alarm
C
78
P 0641
ETC reference voltage A# amplitude fault
A
79
P 0646
short circuit to low voltage or open circuit of AC clutch relay circuit C
80
P 0647
short circuit to high voltage of AC clutch relay circuit
C
81
P 0650
fault indicator light failure
C
82
P 0651
ETC reference voltage B# amplitude fault
A
83
P 0685
main relay fault
A
84
P 0685
main relay fault
A
85
P 0831
signal of clutch switch circuit is often low (short circuit to ground or
open circuit)
C
86
P 0832
signal of clutch switch circuit is often high (short circuit to ground
or open circuit)
C
87
P 1167
front oxygen is too rich during deceleration fuel cutoff
E
88
P 1171
front oxygen is too thin during acceleration enrichment
E
89
P 1336
58 tooth gear error non-learning
A
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90
P 1397
no signal of wheel speed sensor
C
91
P 1516
diagnosis error for ETC drive steady state
A
92
P 2101
diagnosis error for ETC drive second order
A
93
P 2104
forced idle of engine
A
94
P 2105
forced stop of engine
A
95
P 2106
engine performance limitation
A
96
P 2110
engine power management
A
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No.
Fault code
Fault code information
Type of
fault
97
P 2119
electronic throttle valve return fault
C
98
P 2122
low voltage of electronic accelerator pedal position sensor 1#
circuit
A
99
P 2123
high voltage of electronic accelerator pedal position sensor 1#
circuit
A
100
P 2127
low voltage of electronic accelerator pedal position sensor 2#
circuit
A
101
P 2128
high voltage of electronic accelerator pedal position sensor 2#
circuit
A
102
P 2135
correlative fault of electronic throttle valve position sensor 1#, 2#
circuit
E
103
P 2138
correlative fault of electronic accelerator pedal position sensor 1#,
2# circuit
A
104
P 2187
too-thin fuel system under idling condition
E
105
P 2188
too-rich fuel system under idling condition
E
106
P 2A01
slow response of rear oxygen sensor during deceleration fuel cutoff E
107
U 0167
(C167) no response of burglar alarm
C
108
U 0426
(C426) burglar alarm authentication
failure
C
109
B 0010
(8010) fault of crash fuel cutoff rationality
C
Fault Code :P0012
fault code
P0012
air inlet VCP cam phase is big
setting emergency control scheme
light up fault lamp until it is off
connection terminal
MT22.1
VPC control
normal measurement
signal
variable timing control signal
43
B
0 ~ 1000mV
main relay
\
A
12V
judging criteria
possible fault reason
referenced trouble shooting scheme
engine running fault
lasts for more than 2
seconds
1. poor connecting of connectors
1. connect again
2. open circuit of variable timing control signal 2. repair wiring harness
3. short circuit of variable timing control signal 3. repair wiring harness
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4. circuit fault of main relay
4.
repair wiring harness
5. sensor damage
5. change the sensor
6. timing control signal inputing port fault on
ECM
6. change the ECM
Fault Code :P0026
fault code
P0026
air inlet VCP hudraulic control valve vise
setting emergency control scheme
light up fault lamp until it is off; turn off the air inlet VCP
hudraulic control valve
connection terminal
MT22.1
VPC control
normal measurement
signal
variable timing control signal
\
A
12V
main relay
43
B
0-12V
judging criteria
possible fault reason
referenced trouble shooting scheme
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fault code
P0026
air inlet VCP hudraulic control valve vise
lasts for more than 2
seconds
1. hydraulic control valve drive circuit got
short circuit to system power positive
1. repair wiring harness
2. hudraulic control valve damage
2. change the control valve
3 ECM fault
3. change the ECM
Fault Code P0107
fault code
P0107
open circuit or low voltage of air inlet pressure sensor circuit
setting emergency control scheme
light up fault lamp until it is off; engine is stop: 100kPa; engine is
in idle: ≈ 32kPa
engine is running: manifold pressure changes with the opening of
throttle valve
connection terminal
MT22.1
pressure sensor
normal measurement
signal
5V reference voltage
66
3
5V
manifold pressure signal
54
4
0.5 ~ 4.5V
sensor signal ground
76
1
0V
judging criteria
possible fault reason
referenced trouble shooting scheme
engine is running
without TPS fault
MAP<14.017KPa
RPM<1050rpm
TPS>18.75 % the
fault lasted for
more than 2.5
seconds
1. poor connecting
1. connect it again
2. open circuit of harness pressure signal
circuit
2. repair wiring harness
3. short circuit to ground of harness
pressure signal circuit
3. repair wiring harness
4. open circuit of 5V reference voltage
circuit
4. repair wiring harness
5. open circuit of sensor signal ground
circuit
5. repair wiring harness
6. harness of 5V reference voltage circuit is
in reverse with reference ground wire (this
fault can cause damage of sensor)
6.repair wiring harness
7. sensor damage
7. change the sensor
8. MAP signal inputing port fault on ECM
8. ECM change the ECM
Fault Code :P0108
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