Page 980 - Workshop Manual - Tunland (2017)

04-294 DIAGNOSTICS - ENGINE CONTROL SYSTEM

04
(b) Check whether the exhaust pipe is blocked with the exhaust back pressure meter.

Is the inspection result normal?
YES>To step 12.

No > Clean, repair or replace the fault components.

12 . Check the cylinder pressure
(a) Perform the test of cylinder compression pressure.

Is the inspection result normal?
YES>To step 14.
No >To step 13.

13 . Check the engine valve timing
(a) Check whether the engine timing gear is aligned, damaged or not, the belt is loose,
detaching or not.
Is the inspection result normal?

YES>To step 14.
No > Perform the alignment operation of the timing chain or change the timing chain.

14 . Check the motor machinery

(a) Use an endoscope to observe the in-cylinder condition.
(b) Observe and reflect the voltage changes.
(c) Dismantle and repair the motor internal fault.

clean the carbon or disassemble and check the motor cylinder cover. Check the valve,
intake manifold has carbon deposition. Such as: the gap between the piston ring and
the cylinder is too tightly loosed, cylinder pad leaks, valve tube loose, valve does not
close well, and valve has carbon deposition.

Is the inspection result normal?
YES>To step 15.

No > Repair the internal machinery fault of the motor.

15 . Replace ECM
(a) Replace ECM. （Refer to “ Chapter 13 Engine control system, engine control
module”）
(b) Check the data ow of the engine, and make sure the engine phenomenon does not
exist, the system is normal.