70(3) Diagnosis procedure for insufficient engine power (Figure 150)
2. Poor deceleration
(1) Symptom
Idling is normal, but the engine is frequently turned off upon sudden release of the accelerator pedal
during driving.
(2) Causes and Troubleshooting:
a. Throttle position sensor is damaged and shall be replaced;
b. Initial idling is not properly adjusted or automatic idle control is wrong, fuel cut RPM is too low,
ECU fault, repair or replace them.Insufficient power
Insufficient
Check whether throttle valve can be fully open Unable to be fully open
Adjust
OK
Check whether the air cleaner is clogged Clogged
Clean or replace
OK
Check the throttle valve position sensor for failure Abnormal
Repair or replace
OK
Check the water temperature switch and thermostat NG
Replace
OK
Check the vacuum pressure sensor for failure NG
Replace
OK
Check the fuel pressure Excessively low or high
Service the electric fuel pump,
fuel filter and fuel pressure regulator
OK
Check the oxygen sensor Incorrect
Replace
OK
Check the injector Incorrect
Replace
OK
Replace the spark plug, ignition coil and high voltage wire
OK
Disassemble the engineFigure 150
77IV. Exhaust Pipe Discharges Gas with Abnormal Color (or odor)When there is failure in engine combustion system, the exhaust pipe discharges gas with abnormal color.
1. The discharged gas is thickly black
This is caused by incomplete combustion. Since the mixed air is too thick, the combustion is not complete and
part of the fuel is discharged without combustion, leading to decrease of engine power. At this moment, you
should check fuel pressure regulator, throttle position sensor, injector and ECU system and correct the
problems in time.
2. Exhaust is blue and stinks
This is caused by large amount of oil vapor mixed in the exhaust gas that enters in the cylinder and partici-
pates in combustion. One of the primary reasons is that the piston oil ring is dirty and damaged, and shall be
replaced; another reason may be the failure of valve oil seal or excessive clearance between the valve stem
and guide bush hole resulting in oil entering the combustion chamber for combustion, oil seal or valve guide
bush shall be replaced to resume normal condition.
3. Exhaust is white
This is caused by water or fuel vapor mixed in the exhaust. The primary reason is that cylinder head gasket
is damaged, resulting in slow infiltration of coolant into cylinder and the water vapor entry into the exhaust
pipe after combustion, cylinder head gasket shall be replaced to resume the normal condition.Section 3 Engine Noise Diagnosis and TroubleshootingAbnormal sounds generated during engine operation (e.g. knocking sound, chuckle, hiss, rattle) are called
noise.
Engine noise is primarily generated in valve train, connecting rod piston crankshaft components and other
accessory system. The following description discusses the diagnosis and troubleshooting of the noise gener-
ated in valve train and crankshaft connecting rod mechanism.I. Diagnosis and troubleshooting of the noise in valve trainvalve train consists of intake & exhaust camshaft , valve, valve bushing, tappetand counter gear.
1. camshaft noise
(1) camshaft end play is excessively big (normal intake camshaft : 0.030~0.085mm, exhaust camshaft : 0.
035~0.090mm) , when it exceeds 0.11mm and noise is generated, replace it;
(2) Camshaft bend is another cause for noise; it shall be aligned or scraped. ;
(3) Camshaft journal is excessively worn, resulting in big radial clearance between camshaft and bearing and
noise, replace it;
2. Valve group knock noise
(1) Valve noise is caused by excessive valve clearance, the valve spring seat flange is damaged and shall be
replaced;
(2) Valve spring knock noise is caused by broken valve spring. It shall be replaced;
99Service1. Remove the front wheel
2. Remove the ABS sensor signal wire
3. Remove the propeller shaft fixing nut
(1) Remove the cotter pin of the propeller shaft fixing nut
(2) loosen the propeller shaft fixing nut
4. Separate the steering tie rod
(1) Remove the cotter pin and the nut
(2) Separate the tie rod ball stud pin from the knuckle.
5. Detach the swing arm assembly.
(1) Remove the lower swing arm assembly ball stud pin lock bolt and nut on the knuckle
(2) Detach the lower swing arm assembly ball stud pin from the knuckle
6. Remove the constant velocity propeller shaft assembly Appropriately pull the brake outward, use a
rubber hammer or brass bar to tap the propeller shaft to remove itNotice: Actions shall be taken to prevent the propeller from being dropped off, do not damage
the boot and the oil seal7 Inspect the propeller shaft assembly
(1) Check the tripod constant velocity universal joint for looseness
(2) Check the sliding shaft for smooth movement
116Chapter 6 Rear Suspension SystemSection 1 Rear Suspension SystemRear suspension structure descriptionThis model uses strut independent rear suspension with stabilizer bar.
Rear suspension consists of the parallel front and rear double transverse arms, trailing rod, rear stabilizer bar
and rear strut assembly. The shock absorber and cone coil spring are arranged eccentrically.
See the table below for the major technical parameters of the rear suspensionProblem Symptoms TableUse the table below to help you find the cause of the problem. The numbers indicate the priority of the likely
cause of the problem. Check each part in order. If necessary, replace these parts.Items Parameter Items Parameter
Shoc k a bsorbe r operating
cylinder diameter /mm¢
56 Cambe r -20´±30´
Shoc k a bsorbe r piston rod
diameter/mm¢
18 Wheel toe-in/mm 1~
5
Shoc k absorbe r stroke/mm 230mm
Remark: Wheel alignment parameter is at free loadSympto m Sus pe cte d Are a
1. Tires (Worn or imprope rly infla te d)
2. Wheel alignment (Incorrect)
3. Hub be a ring (Worn or da ma ge d)
4. Suspe nsion pa rts (Worn or da ma ge d)
1. Ve hic le (Ove rloa de d)
2. Spring (Stiffness small)
3. Shoc k a bsorbe r (Worn)
1. Tire (Worn or imprope rly inflate d)
2. W he e l ( not w it hin s pe c if ic a t ion)
3. Shoc k a bsorbe r (Worn)
1. Tire (Worn or imprope rly inflate d)
2. Wheel alignment (Incorrect)
3. Shoc k a bsorbe r (Worn)
4. W he e l ( not w it hin s pe c if ic a t ion)
1. Tire (Worn or imprope rly inflate d)
2. Wheel alignment (Incorrect)
3. Shoc k a bsorbe r (Worn)
4. Sus pe nsion pa rts (Worn) Abnormal tire wearDeviation
Body Desc ent
SwaysRear wheel shimmy
129Symptom TableThe table below is helpful to find the cause of the problem. The numbers indicate the priority of the likely
cause of the problem. Check each part in order. Repair or replace these parts or assemblies if necessary.On-vehicle inspection1. Check steering wheel free stroke
(1) Stop vehicle and keep the tires straight ahead.
(2) Rotate the steering wheel lightly, check the steering wheel free stroke.
Maximum free stroke: 30mmSymptom Like ly Ca us e
1.
Tire (imprope rly infla te d)
2.
P owe r ste ering fluid (insuffic ie nt)
3.
Front whe e l a lignme nt (inc orre c t)
4.
Ste e ring knuckle (worn)
5.
Swing a rm ba ll stud pin joint (worn)
6.
St e e r ing c olumn ( be nt or binding)
7.
P owe r ste ering pump a ssembly (Worn)
8.
Power steering gear assembly (Fault)
1.
Tire (imprope rly infla te d)
2.
Front whe e l a lignme nt (inc orre c t)
3.
St e e r ing c olumn ( be nt or binding)
4.
Power steering gear assembly (Oil pressure too low)
1.
Ste e ring knuckle (worn)
2.
Swing a rm ba ll stud pin joint (worn)
3.
Inte rmediate sha ft, sliding yoke (worn)
4.
Front whe e l be a ring (w orn)
5.
P owe r ste ering ge a r asse mbly (worn)
1.
P owe r ste ering pump fluid leve l (low)
2.
St e e r ing s ys t e m ba ll joint ( w or n)
3.
Power steering pump assembly (damaged)
4.
Power steering gear assembly (damaged) He avy ste eringPoor returnExcessive
clearance and
play
A bnor ma l nois eMaximum Free Stroke
135Replacement1. Drain the power steering system fluid
2. Remove the power steering high and low pressure pipe
3. Loosen the union screw of the high and low pressure pipe on the steering gear assembly, loosen the pipe
clip.
4. Loosen the drive belt
5. Remove the power steering pump with bracket assembly from the engine
Remove the 4 attaching bolts between the steering pump belt bracket and the engine6.Install the power steering pump bracket assemblySecure the power steering pump bracket assembly to the engine,
The torque of the M10 bolt is 45~79N.m, the torque of the M8 bolt is 16~26N.m7. Install the drive belt, make sure the installation position is correct
8. Install the power steering high and low pressure pipe(1)Connect the union thread of the high and low pressure pipe to the steering gear,
torque: 19~33N.m
(2) Use the retaining clip to secure the low pressure pipe to the cowl baffle panel of the body
(3)Connect the union thread of the high pressure pipe to the power steering pump,
torque: 19~33N.m
(4) Connect the union thread of the low pressure pipe to the reservoir, torque: 19~33N.m
9. Bleed the power steering pipeline system, check the pipeline system for leakage
10. Check the oil reservoir inner fluid level
139Chapter 9 Brake SystemSection 1 Brake SystemPrecaution1. It's very important to keep the parts and area clean when repairing the brake system.
2. Care must be taken to replace each part properly as it could affect the performance of the brake
system and result in a driving hazard.
3. Do not let brake fluid remain on a painted surface when repairing any parts. Wash it off
immediately.
4. If any work is done on the brake system or air in the brake pipelines is suspected, bleed the
system of air.
5. Check the brake system for leakage after repairing the brake system.
6. Use specified brake fluid. Do not mix with other brand of brake fluid.Problem symptoms tableUse the table below to help you find the cause of the problem. The numbers indicate the priority of the likely
cause of the problem. Check each part in order. If necessary, replace these parts.Symptom Cause
1. Brake system (fluid leaks)
2. Brake system (air in)
3. P iston Cup in Sub-pump (worn or dama ge d)
4. Rear brake shoe clearance (out of adjustment)
5. Master cylinder (faulty)
6. Booste r push rod (out of a djustme nt)
7. Brake shoe or lining (oily)
8. Disc/Drum scratched
1. Brake pe dal free stroke is too small
2. P a rking brake le ver stroke (out of a djustme nt)
3. P a rking brake ca ble (stic king)
4. Rear brake shoe clearance (out of adjustment)
5. Brake pa d or lining (c rac ked or distorte d)
6. Wheel cylinder piston (stuck or frozen)
7. Return spring (faulty)
8. Va cuum booster (faulty)
9. Brake master cylinder (faulty) Low Brake P edal
Brake Stagnation
140Section 2 Brake FluidBleeding1. Fill brake reservoir with brake fluid
Brake fluid: JG4 GB10830
2. Bleed brake pipeline system
(1) Connect the vinyl pipe to the wheel cylinder bleeder plug port
(2) Depress the brake pedal several times, and then loosen the bleeder plug with the pedal held down.
(3) At the point when fluid stops flowing out, tighten the bleeder plug, and then release the brake pedal.
(4) Repeat (2) and (3) until all the air in the fluid has been bled out.
(5) Repeat the above procedure to bleed the brake pipeline of the air for each wheel cylinder.
Notice: Fill brake fluid into the reservoir all the time when bleeding.
3. Check fluid level in reservoir
Check the fluid level and fill fluid if necessary.Symptom Suspe ct a re a
1. Whee l cylinder piston (stuck)
2. Bra ke shoe lining (oily)
3. Disc (scratched)
4. Bra ke shoe s or lining (c ra cke d or distorte d)
5. Whee l hub be a ring (worn or da mage d)
Tire pressure (not as specified)
1. Bra ke shoe lining (da mage d)
2. Insta lla tion bolt (loose )
3. Disc (scratched)
4. Bra ke shoe (ba d in qua lity)
5. Bra ke shoe s lining (oily)
6. Sound isolating shim da mage d
7. Hold spring of bra ke shoe (da mage ) Brake Deviation
Noise from brake