Page 981 - Workshop Manual - Tunland (2017)

DIAGNOSTICS - ENGINE CONTROL SYSTEM 04-295

THE COLD CAR STARTS DIFFICULTLY,THE CAR IS TREMBLED 04

Fault phenomenon Diagnosis logic Possible reasons
• Poor quality of fuel
• Injector fault
• Injector • Leakage in the intake
• Intake system system
• Fuel system • Low fuel pressure
• Coolant temperature sensor • Block in the air filter
• Intake mass flow sensor • Coolant temperature sensor
• Injection timing fault
The cold car starts difficultly,
• Intake heater • Intake mass flow sensor
the car is trembled
• Wrong mixture ratios fault
• Carbon decomposition of • Electronic throttle fault
cylinder valve and inlet • Block in fuel filter
channel • Incorrect injection timing
• Fuel quality • Intake heater fault
• ECM • Too low of the cylinder
compression pressure
• ECM fault

Diagnosis Procedure

1 . Check the engine data
(a) Ignition switch: OFF.
(b) Connect the diagnosis tool with the fault diagnosis connector (16 pins) on the lower
left of the dashboard.
(c) Ignition switch: ON, and start the diagnostic tool.
(d) Read the motor data shown on the diagnostic tool.

Check whether the data flow is normal or not.

YES>To step 2.
No >Maintenance related faults.

2 . Check battery
(a) Start the engine, check battery voltage.

Is the inspection result normal?
YES>To step 3.

No >Charge the battery or replace the battery.

3 . Check the starter
(a) Check whether the starter or the starter circuit has fault.

Is the inspection result normal?
YES>To step 4.

No >Eliminate the problem and confirm that the phenomenon no longer exists.