CFMoto ATV Terralander CF800-2. Service Manual - part 7
17 TROUBLESHOOTING
Trouble code P0107：Intake air temp. sensor low voltage or open circuit
Possible causes：
Repair procedures：
1）The sensor short circuit to ground
1）Measure resistance between ECU and ground
Trouble code P0108：Intake air temp. sensor high voltage
Possible causes：
Repair procedures：
1）The sensor short circuit to ground
1）Measure ECU pin voltage
Trouble code P0112： Intake air temp. sensor low voltage
Possible causes：
Repair procedures：
1）The sensor connected with ECU pin short circuit
1）Measure resistance between ECU pin and ground
to ground
Trouble code P0113：Intake air temp. sensor high voltage or open circuit
Possible causes：
Repair procedures：
1）The sensor connected with ECU pin short circuit
1）Measure sensor voltage connected with ECU pin if it’s ok.
to power
Trouble code P0117：Water temp. sensor low voltage
Possible causes：
Repair procedures：
1)The sensor connected with ECU pin short circuit
1) Measure resistance between ECU pin and ground.
to ground
Trouble code P0118：Water temp. sensor high voltage or open circuit
Possible causes：
Repair procedures：
1）The sensor connected with ECU pin short circuit
1) Measure voltage of ECU pin if it’s ok.
to other circuit.
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Trouble code P0122：TPS low voltage or open circuit
Possible causes：
Repair procedures：
1）ECU pin short circuit to ground
1）Measure resistance between ECU pin and ground
Trouble code P0123：TPS high voltage
Possible causes：
Repair procedures：
1）Short circuit between ECU pin and other circuit
1）Measure voltage connected with ECU pin if it’s ok.
Trouble code P0201/ P0202: 1/2 cylinder injector coil defective
Possible causes：
Repair procedures：
1） Injector coil if it’s open circuit.
1） Measure injector resistance
2） Improper connection between injector pin and
2） Check continuity of all wirings
ECU pin
3）Measure resistance between ECU pin and ground
3） Improper connection between injector pin and
4）Measure voltage connected with ECU pin.
relay
4）All drive circuit connected with ECU short to ground
5）Short circuit between ECU pin and other circuit.
Trouble code P0336： Pick-up (Crankshaft phase sensor) signal incorrect
Possible causes：
Repair procedures：
1） Wiring continuity short circuit or open circuit from
1） Check wiring continuity if it’s ok.
time to time
2） Check flywheel rotor gear quantity.
2） Installation of crankshaft signal wheel improperly
3） RPM sensor installation improperly
Trouble code P0337：Pick-up (crankshaft phase sensor) no signal
After engine is started, ECU will monitor pick-up signal and other signals at the same time.
It will judge if pick-up signal is missing or not by signal reasonability.
Possible causes：
Repair procedures：
1）Open circuit between RPM sensor and ECU
1） Measure resistance between pick-up and ECU
2）Short circuit between pick-up and ECU
2） Measure resistance of pick-up
3）Open circuit of pick-up coil.
3） Measure peak voltage of pick-up.
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17 TROUBLESHOOTING
Trouble code P0230：Fuel pump relay coil low voltage or open circuit
Trouble code P0232：Fuel pump relay coil high voltage
Possible causes：
Repair procedures：
1) Open circuit/short to ground/short to power
1）Measure resistance or voltage between ECU and fuel pump
between control circuit of fuel pump relay
relay.
connected with ECU and fuel pump replay
2）Measure resistance between fuel pump relay and main
2）Open circuit between fuel pump relay and main
relay.
relay.
3）Measure resistance between two pins of fuel pump relay.
3）Open circuit between relay coils.
Trouble code P0505：Out of idle speed when at idle condition
Engine idle speed is controlled by ECU close-loop. In case ECU gives idle instruction, but engine
idle speed still is higher than targeted idle speed set by ECU, then it’s trouble.
Possible causes：
Repair procedures：
1） Check adjust screw of throttle, throttle cable
1）Switch off ignition more than 3 seconds and restart engine.
and throttle working condition if it’s ok.
2）Too dirty inside throttle body.
Trouble code P0562：Battery low voltage
Trouble code P0563：Battery high voltage
Possible causes：
Repair procedures：
1）Flywheel already broken and cannot generate
1) Check flywheel power generation ( By measuring flywheel
power or battery power leakage
voltage)
2）Open circuit of flywheel stator coil.
2) Measure regulator voltage
3）Regulator already damaged
Trouble code P0650：MIL light drive circuit defective
Possible causes：
Repair procedures：
1) Open circuit/short to ground/short to power
1）Measure resistance or voltage between ECU and MIL light
between ECU and MIL light drive circuit.
drive circuit.
2）Open circuit between MIL and main relay
3）MIL light burnt
Trouble code P0500: Speed sensor no signal
When vehicle is running with gear and with loose throttle body, ECU will monitor engine RPM
and speed sensor. In case engine has high RPM, but speedometer shows 0 or very low, then it’s
a trouble of speed sensor.
Possible causes：
Repair procedures：
1）Short or open circuit between ECU and speed
1) Measure resistance between ECU pins and speed sensor.
sensor
2）Measure resistance between ECU pins and ground
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Trouble code：P0850 Nuetral gear sensor defective
Engine cannot be started when at “N” gear position.
Possible causes:
Repair procedures:
1）Open circuit between N gear sensor and ground
1) Measure resistance between ECU pin and N gear sensor
Trouble code：P0445 Starter auxiliary relay high voltage
Trouble code：P0444 Starter auxiliary relay low voltage or open circuit
Possible causes:
Repair procedures:
1）Open circuit/short to ground/short to power
1）Measure resistance or voltage between ECU and auxiliary
between ECU and auxiliary relay.
relay.
2）Open circuit between auxiliary relay and power.
2）Measure resistance between auxiliary relay and power.
3）Open circuit between relay coils.
3）Measure resistance between auxiliary relay two pins.
Trouble code P1693：RPM low output voltage
Trouble code P1694：RPM high output voltage
After engine is started, ECU will monitor pick-up signal and other signals.
It will judge if pick-up signal is missing or not by signal reasonability.
Possible causes:
Repair procedures:
1） Short circuit or open circuit between wirings
1） Check wiring continuity.
from time to time.
2） Check flywheel rotor gear quantity.
2） Improper installation of crankshaft signal
3） Measure resistance between pick-up and ECU
wheel.
4） Measure resistance of pick-up
3） Improper installation of RPM sensor
5） Measure peak voltage of pick-up.
4） Open circuit between RPM sensor and ECU
5） Short circuit between pick-up and ECU
6） Open circuit between pick-up coils
Trouble code P0351/ P0352：1/2 ignition coil defective
Possible causes:
Repair procedures:
1） Ignition coil open circuit
1） Measure resistance of ignition coil
2） Improper connection between ignition coil and
2） Check wiring continuity.
ECU pins.
3）Measure resistance between ECU pin and ground
3） Improper connection between ignition coil and
4）Measure voltage between ECU pins
relay.
4）Short circuit between drive circuit connected
with ECU and ground.
5）Short circuit between ECU pin and other circuits
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17 TROUBLESHOOTING
4. Trouble diagnosis by engine problems
Before trouble diagnosis by engine problems, initial checking should be done as follows.
1. Confirm if trouble light is ok;
2. Confirm there’s no trouble code record by PDA checking.
3. Confirm there’s really trouble existing complained by end-users.
Then check the following points.
（1） Check fuel hoses if any fuel leakage；
（2） Check vacuum pipes if any broken, twist or improper connection；
（3） Check intake manifold if any blocked, air leakage or damaged；
（4） Check high-tension cable if any damaged, aging；or ignition order is correct.
（5） Check wiring close to ground if it’s clean and firm；
（6） Check connector of all sensors and actuator if any loose or improper connection.
Important note： In case there’re some problems as above-mentioned, then removal work should be done
firstly, then go to next diagnosis.
Diagnosis helps：
1. Confirm engine without any trouble record.；
2. Confirm there’s really trouble existing；
3. During checking, do not neglect vehicle periodic maintenance, cylinder pressure, valve timing, fuel supply
and so on；
4. Replace ECU to test.
In case trouble disappears, then it’s a problem of ECU. If trouble still exists, then assemble original ECU and
check other points.
Frequent troubles list：
z
When starting engine, engine cannot rotate or rotate slowly.
z
When starting engine, starter motor can rotate but cannot start engine.
z
Difficult to start warm or hot engine
z
Difficult to start cold engine
z
RPM is ok, but difficult to start engine.
z
Starting is ok, but idle speed is unstable at any time.
z
Starting is ok, but idle speed is unstable during engine warm-up period.
z
Starting is ok, but idle speed is unstable after engine warm-up.
z
Starting is ok, idle speed is unstable or engine stop when switch on some lights or other electric
components.
z
Starting is ok, but too high idle speed.
z
RPM cannot go up or engine stop when acceleration.
z
Slow acceleration.
z
Insufficient power and bad performance when acceleration.
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17 TROUBLESHOOTING
（1）When starting, engine cannot rotate or rotate slowly.
Possible causes：1. battery；2. starter motor；3. wiring or ignition switch；4. engine mechanical part.
General operation procedures：
Item
operation procedures
Result
Then
No.
Use multimeter to measure voltage between positive and
Yes
Next step
1
negative terminals of battery, normal value should be 8-12V
No
Replace battery
when starting engine.
Yes
Next step
Keep ignition switch on starting position, then use multimeter to
2
measure voltage of positive terminal of starter motor. Normal
No
Repair or replace wiring
value should be more than 8V.
Remove starter motor and check if any open circuit or blocked
Yes
Repair or replace starter motor
3
by bad lubrication
No
Next step
If trouble only exists in winter, then resistance of starter motor
Yes
Change good engine oil
4
is too big by unsuitable engine oil.
No
Next step
Yes
Check resistance inside engine
5
Check if mechanical resistance is too big inside engine
No
Repeat above procedures
（2）When starting, starter motor can rotate but engine cannot be started.
Possible causes：1. No fuel inside fuel tank；2. Fuel pump；3. Pick-up；4. Ignition coil；
5. Engine mechanical part.
General operation procedures：
Item
Operation procedures
Result
Then
No.
Switch on ignition switch(repeat several times if necessary)
Yes
Next step
or start engine and use fuel pressure meter to measure fuel
1
pressure of fuel pump. Correct value should be around
No
Check fuel supply system
330Kpa (3.30Bar)
Yes
Next step
Use PDA to see RPM data, and start engine to check if any
2
RPM signal output.
No
Check RPM sensor wiring
Disconnect high-tension cable and connect spark plug, keep
Yes
Next step
3
spark plug 5mm away from engine body, then start engine to
check if any white/blue spark occurs.
No
Check ignition system
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17 TROUBLESHOOTING
Yes
Remove engine mechanical trouble
4
Check cylinder pressure if it’s enough or not
No
Next step
Connect PDA and switch on ignition to check ECU-J2-15 pin
Yes
Use PDA to diagnose
5
and J2-18 pin if it is powered normally; Check ECU-J1-9 pin
and J2-2 pin if it is connected to ground normally.
No
Check and repair wiring circuit
（3）Difficult to start hot or warm-up engine
Possible causes：1. Fuel with water；2. Fuel pump；3. Water temp. sensor；4. Ignition coil.
General operation procedures：
Item
Operation procedures
Result
Then
No.
Yes
Next step
Connect fuel pressure meter and start engine to measure
1
fuel pressure if it’s around 330Kpa (3.30Bar)
Check and repair fuel supply
No
system
Disconnect high-tension cable and connect spark plug, keep
Yes
Next step
2
spark plug 5mm away from engine body, then start engine to
see if there’s blue and white spark.
No
Check and repair ignition system
Check and repair wiring or
Disconnect connector of water temp. sensor and start
Yes
replace sensor
engine, check if engine can be started successfully. (or use a
3
300Ω resistant to connect water temp. sensor connector and
No
Next step
check if engine can be started successfully.
No
Next step
Yes
Change fuel
4
Check fuel quality and if it’s caused only after filling fuel.
No
Next step
Connect PDA and switch on ignition to check ECU-J2-15 pin
Yes
Use PDA to diagnose
5
and J2-18 pin if it is powered normally; Check ECU-J1-9 pin
and J2-2 pin if it is connected to ground normally.
No
Check & repair wiring
（4）Difficult to start cold engine
Possible causes：1. Fuel with water；2. Fuel pump；3. Water temp. sensor；4. Injector；5. Ignition coil；
6.Throttle body and air by-pass valve；7. Engine mechanical part
General operation procedures：
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17 TROUBLESHOOTING
Item
Operation procedures
Result
Then
no.
Yes
Next step
Use fuel pressure meter and start engine to measure
1
if fuel pressure is around 330Kpa (3.30Bar)
No
Check and repair fuel supply system
Disconnect high-tension cable and connect spark
Yes
Next step
2
plug, keep it 5mm away from engine body, then start
engine to check if there’s blue and white spark.
No
Check and repair ignition system
Disconnect connector of water temp. sensor, start
Yes
Check and repair wiring or sensor
engine and check if it can be started successfully. (or
3
use 2500Ω resistant to connect sensor and check if
No
Next step
engine can be started successfully.
Clean throttle body and air by-pass
Open throttle very slowly to check if it can be started
Yes
4
valve
easily.
No
Next step
Remove injector and use special cleaning equipment
Yes
Replace injector
5
to check if any leakage or blocked
No
Next step
Check fuel quality and if it is caused just after filling
Yes
Change fuel
6
fuel
No
Next step
Yes
Remove engine mechanical problem
7
Check cylinder pressure if it is enough or not.
No
Next step
Connect PDA and switch on ignition to check
Yes
Use PDA to diagnose
ECU-J2-15 pin and J2-18 pin if it is powered normally;
8
Check ECU-J1-9 pin and J2-2 pin if it is connected to
No
Check and repair wiring
ground normally.
（5）RPM is ok, but difficult to start engine at any time.
Possible causes：1. Fuel with water；2. Fuel pump；3.Water temp. sensor；4. Injector；5. Ignition coil；
6.Throttle body and air by-pass valve；7. Intake manifold；8. Ignition timing；9. Spark plug；
10. Engine mechanical part
General operation procedures：
Item
Operation procedures
Result
Then
No.
Check air filter if any blocked, or intake manifold if any
Yes
Check and repair intake manifold
1
blocked or leakage
No
Next step
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17 TROUBLESHOOTING
Yes
Next step
Use fuel pressure meter and start engine to check if fuel
2
pressure is around 330Kpa (3.30Bar)
Check and repair fuel supply
No
system
Disconnect spark plug cap and connect spark plug, keep it
Yes
Next step
3
5mm away from engine body, then start engine to check if
there’s blue and white spark.
No
Check and repair ignition system
Yes
Next step
4
Check spark plug if it is under technical specifications.
No
Adjust or replace
Check and repair wiring or replace
Disconnect water temp. sensor connector and start engine to
Yes
5
sensor
check if it can be started successfully.
No
Next step
Open throttle very slowly to check if engine can be started
Yes
Clean throttle body
6
easily.
No
Next step
Remove injector and use special cleaning equipment to check
Yes
Replace injector
7
if any leakage or blocked.
No
Next step
Yes
Change fuel
8
Check fuel quality and if it is caused just after filling fuel.
No
Next step
Yes
Remove engine mechanical part
9
Check cylinder pressure if it is enough.
No
Next step
Yes
Next step
10
Check ignition timing if it is ok.
No
Check and repair ignition timing
Connect PDA and switch on ignition to check ECU-J2-15 pin
Yes
Use PDA to diagnose
11
and J2-18 pin if it is powered normally; Check ECU-J1-9 pin
and J2-2 pin if it is connected to ground normally.
No
Check and repair wiring
（6）Starting is ok, but idle speed is unstable at any time
Possible causes：1. Fuel with water；2. Injector；3. Spark plug；4.Throttle body；5.Intake manifold；
6. Air by-pass valve；7.Ignition timing；8.Spark plug；9. Engine mechanical part
General operation procedures：
Item
Operation procedures
Result
Then
No
Check and repair intake manifold
Check air filter if any blocked, or intake manifold if any air
Yes
1
system
leakage.
No
Next step
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17 TROUBLESHOOTING
Yes
Clean or replace
2
Check if air by-pass valve is blocked
No
Next step
Yes
Next step
3
Check spark plug if it’s under technical specifications.
No
Adjust or replace
Check throttle body and by-pass air pipe if any carbon
Yes
Clean
4
deposit.
No
Next step
Remove injector and use special cleaning equipment to
Yes
Replace
5
check if any leakage, blocked or incorrect fuel flow and so
No
Next step
on.
Yes
Change fuel
6
Check fuel quality and judge it’s caused just after filling fuel.
No
Next step
Yes
Remove mechanical problem
7
Check cylinder pressure if it’s not enough.
No
Next step
Yes
Next step
Check mechanical ignition timing if it’s under technical
8
specifications.
No
Check and repair ignition timing
Connect PDA and switch on ignition to check ECU-J2-15 pin
Yes
Use PDA to diagnose
9
and J2-18 pin if it is powered normally; Check ECU-J1-9 pin
and J1-2 pin if it is connected to ground normally.
No
Check and repair wiring
（7）Starting is ok, but idle speed is unstable during engine warming-up.
Possible causes：1. Fuel with water；2. Water temp. sensor；3. Spark plug；4. Throttle body and by-pass air
pipe；5.Intake manifold；6.Air by-pass valve；7. Engine mechanical part
General operation procedures：
Item
Operation procedures
Resul
Then
No.
t
Check air filter if any blocked or intake manifold any
Yes
Check air filter and intake manifold
1
leakage
No
Next step
Yes
Next step
2
Check spark plug if it’s under technical specifications.
No
Adjust or replace
Remove air by-pass valve and check throttle body, air
Yes
Clean it
3
by-pass valve and idle by-pass pipe if any carbon deposit.
No
Next step
Remove water temp. sensor and start engine to check if
Yes
Check wiring or replace sensor
4
engine can keep stable idle during warming-up.
No
Next step
Remove injector and use special cleaning equipment to
Yes
Replace
5
check if any leakage, blocked or incorrect fuel flow and so
No
Next step
on.
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19 TROUBLESHOOTING
Check fuel quality and if it’s caused just after filling
Yes
Change fuel
6
fuel.
No
Next step
Yes
Remove engine mechanical problem
7
Check cylinder pressure if it’s out of range.
No
Next step
Connect PDA and switch on ignition to check
Yes
Use PDA to diagnose
ECU-J2-15 pin and J2-18 pin if it is powered normally;
8
Check ECU-J1-9 pin and J2-2 pin if it is connected to
No
Check and repair wiring
ground normally.
（8）Starting is ok, but idle speed is unstable after engine warming up.
Possible causes：1. Fuel with water；2. Water temp. sensor；3. Spark plug；4. Throttle body and idle by-pass
pipe；5. Intake manifold；6. Air by-pass valve；7. Engine mechanical part
General operation procedures：
Item
Operation procedures
Re-
Then
No.
sult
Check air filter if any blocked, and intake manifold if any
Yes
Check&repair air filter &intake manifold
1
leakage.
No
Next step
Yes
Next step
2
Check spark plug if it’s under technical specifications.
No
Adjust or replace
Remove air by-pass valve, check throttle body, air
Yes
Clean it
3
by-pass valve and it pipe if any carbon deposit.
No
Next step
Disconnect connector of water temp. sensor and start
Yes
Check & repair wiring or replace sensor
4
engine to see if any unstable idle during warming up
No
Next step
Remove injector and use special cleaning equipment to
Yes
Replace it
5
check if any leakage, blocked or incorrect fuel flow and
No
Next step
so on.
Yes
Change fuel
6
Check fuel quality if it’s caused just after filling fuel.
No
Next step
Yes
Remove mechanical problem
7
Check cylinder pressure if it’s out of range.
No
Next step
Connect PDA and switch on ignition to check
Yes
Use PDA to diagnose
ECU-J2-15 pin and J2-18 pin if it is powered normally;
8
Check ECU-J1-9 pin and J2-2 pin if it is connected to
No
Check & repair wiring
ground normally.
Turn off ignition, and switch on ignition to restart engine
Yes
9
after 3 seconds.
No
Check & repair wiring
（9）Starting is ok, but idle speed is unstable or killed off when lights (or other electrical components) switched
on.
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17 TROUBLESHOOTING
Possible causes： 1. Air by-pass valve；2. Injector
General operation procedures：
Item
Operation procedures
Results
Then
No.
Remove air by-pass valve, check throttle body, air by-pass
Yes
Clean it
1
valve and it pipe if any carbon deposit.
No
Next step
Check engine output power if it is too big when switching
Yes
Operate step 4
2
on electric components. And use PDA to check advanced
No
Next step
ignition angle, fuel spray width and air intake flow.
Remove injector and use special cleaning equipment to
Yes
Replace it
3
check if any leakage, blocked or incorrect fuel flow and so
No
Next step
on.
Connect PDA and switch on ignition to check ECU-J2-15
Yes
Use PDA to diagnose
pin and J2-18 pin if it is powered normally; Check
4
ECU-J1-9 pin and J2-2 pin if it is connected to ground
No
Check&repair wiring
normally.
（10）Starting is ok, but idle speed is too high.
Possible causes：1.Throttle body and idle pipe； 2.Injector seat；3. Air by-pass valve；4. Water temp. sensor；
5. Ignition timing
General operation procedures：
Item
Operation procedures
Result
Then
No.
Yes
Adjust
1
Check throttle cable if it is blocked or too tight.
No
Next step
Yes
Check&repair air intake system
2
Check air intake system and injector seat if any leakage
No
Next step
Remove air by-pass valve, check throttle body, air by-pass
Yes
Clean it
3
valve and its pipe if any carbon deposit.
No
Next step
Check&repair wiring or replace
Disconnect connector of water temp. sensor and start
Yes
4
sensors
engine to check if idle speed is too high.
No
Next step
Yes
Next step
5
Check ignition timing if it is under technical specifications.
No
Check & repair ignition timing
Turn off ignition, switch on ignition after 3 seconds and
Yes
6
restart engine.
No
Check & repair wiring
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17 TROUBLESHOOTING
Connect PDA and switch on ignition to check ECU-J2-15 pin
Yes
Use PDA to diagnose
6
and J2-18 pin if it is powered normally; Check ECU-J1-9 pin
and J2-2 pin if it is connected to ground normally.
No
Check &repair wiring
（11）RPM cannot go up or engine stop when acceleration
Possible causes：1. Fuel with water；；2.Air intake sensor and TPS；3. Spark plug；4.Throttle body and its idle
pipe；5.Intake manifold；6.Air by-pass valve；7. Injector；8.Ignition timing；9. Exhaust pipe
General diagnosis procedures：
Item
Operation procedures
Result
Then
No.
Check air filter if any blocked, and intake manifold if any
Yes
Check&repair air intake system
1
leakage.
No
Next step
Use fuel pressure meter and start engine to measure fuel
Yes
Next step
2
pump pressure. Normal value should be around 330Kpa
(3.30Bar)
No
Check&repair fuel supply system
Yes
Next step
3
Check spark plug if it’s under technical specifications.
No
Adjust or replace
Remove air by-pass valve, check throttle body, air by-pass
Yes
Clean it
4
valve and it pipe if any carbon deposit.
No
Next step
Yes
Next step
5
Check air intake temp. sensor, TPS and its wiring if it is ok.
Check&repair wiring or replace
No
sensor
Remove injector and use special cleaning equipment to
Yes
Replace it
6
check if any leakage, blocked or incorrect fuel flow and so
No
Next step
on.
Yes
Change fuel
7
Check fuel quality and if it’s caused just after filling fuel.
No
Next step
Yes
Next step
Check ignition order and ignition timing if it is under
8
technical specifications.
No
Check&repair ignition timing
Yes
Next step
9
Check exhaust pipe if any leakage or blocked.
No
Repair & replace exhaust pipe
Connect PDA and switch on ignition to check ECU-J2-15
Yes
Use PDA to diagnose
pin and J2-18 pin if it is powered normally; Check
10
ECU-J1-9 pin and J2-2 pin if it is connected to ground
No
Check&repair wiring
normally.
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17 TROUBLESHOOTING
（12）Slow acceleration
Possible causes：1.Fuel with water；2. Air intake pressure sensor and TPS；3. Spark plug；4. Throttle body
and its idle pipe；5. Intake manifold；6. Air by-pass valve；7. Injector；8. Ignition timing；9. Exhaust pipe
General operation procedures：
Item
Operation procedures
Result
Then
No.
Check air filter if any blocked, and intake manifold if
Yes
Check&replace air intake system
1
any leakage.
No
Next step
Use fuel pressure meter and start engine to
Yes
Next step
2
measure fuel pump pressure. Normal value should
be around 330Kpa (3.30Bar)
No
Check&repair fuel supply system
Check spark plug if it’s under technical
Yes
Next step
3
specifications.
No
Adjust or replace
Remove air by-pass valve, check throttle body, air
Yes
Clean it
4
by-pass valve and it pipe if any carbon deposit.。
No
Next step
Yes
Next step
Check air intake temp. sensor, TPS and its wiring if it
5
is ok.
No
Check&repair wiring or replace sensor
Remove injector and use special cleaning
Yes
Replace it
6
equipment to check if any leakage, blocked or
No
Next step
incorrect fuel flow and so on.
Check fuel quality and if it’s caused just after filling
Yes
Change fuel
7
fuel.
No
Next step
Yes
Next step
Check ignition order and ignition timing if it is under
8
technical specifications.
No
Check&repair ignition timing
Yes
Next step
9
Check exhaust pipe if any leakage or blocked.
No
Repair or replace exhaust pipe
Connect PDA and switch on ignition to check
Yes
Use PDA to diagnose
ECU-J2-15 pin and J2-18 pin if it is powered
10
normally; Check ECU-J1-9 pin and J2-2 pin if it is
No
Check&repair wiring
connected to ground normally.
（13）Power not enough when acceleration and bad performance
Possible causes：1.Fuel with water；2. Air intake pressure sensor and TPS；3. Spark plug；4. Ignition coil；
5. Throttle body and its idle pipe；6.Intake manifold；7.Air by-pass valve；8. Injector；9. Ignition timing；10.
Exhaust pipe
17-22
17 TROUBLESHOOTING
General operation procedures：
Item
Operation procedures
Result
Then
No.
Check if any clutch slippery, or tire pressure too low, or
Yes
Repair
1
brake too tight, or tire size incorrect and so on.
No
Next step
Check air filter if any blocked, and intake manifold if any
Yes
Check&repair air intake system
2
leakage.
No
Next step
Use fuel pressure meter and start engine to measure fuel
Yes
Next step
3
pump pressure. Normal value should be around 330Kpa
(3.30Bar)
No
Check&repair fuel supply system
Yes
Next step
Disconnect high-tension cable, and connect spark plug,
4
keep it 5mm away from engine body to check if spark is ok.
No
Check&repair ignition system
Yes
Next step
5
Check spark plug if it’s under technical specifications.
No
Adjust or replace
Remove air by-pass valve, check throttle body, air by-pass
Yes
Clean it
6
valve and it pipe if any carbon deposit.。
No
Next step
Yes
Next step
7
Check air intake temp. sensor, TPS and its wiring if it is ok.
Check&repair wiring or replace
No
sensor
Remove injector and use special cleaning equipment to
Yes
Replace it
8
check if any leakage, blocked or incorrect fuel flow and so
No
Next step
on.
Yes
Change fuel
9
Check fuel quality and if it’s caused just after filling fuel.
No
Next step
Yes
Next step
Check ignition order and ignition timing if it is under
10
technical specifications.
No
Check&repair ignition timing
Yes
Next step
11
Check exhaust pipe if any leakage or blocked.
No
Repair or replace exhaust pipe
Connect PDA and switch on ignition to check ECU-J2-15
Yes
Use PDA to diagnose
12
pin and J2-18 pin if it is powered normally; Check ECU-J1-9
pin and J2-2 pin if it is connected to ground normally.
No
Check&repair wiring
17-23