Page 623 - Foton Workshop Manual - Tunland (AT)

DIAGNOSTICS - ENGINE CONTROL SYSTEM 04-477

4 . Check the intake system
(a) Check whether air filter is blocked.
(b) Check whether pipe of the intake system leaks.
(c) Check whether turbocharger can work properly.

Is the inspection result normal?
04
YES>To step 5.

No >Maintenance related faults.

5 . Check the electronic throttle
(a) Check whether the electronic throttle can work normally.

Is the inspection result normal?
YES>To step 6.
No >Maintenance related faults.

6 . Check the intake manifold pressure temperature sensor
(a) Check whether the intake manifold pressure temperature sensor is installed correctly.
(b) Remove the intake manifold pressure temperature sensor
(c) Check whether the sensing hole is blocked or not, and whether the resistance between
the terminals is in line with the standard or not.
(d) Check whether the intake manifold pressure temperature sensor is dirty.
(e) Ignition switch: ON, and read the data flow of the intake manifold pressure temperature
sensor shown on the diagnostic tool.

Is the inspection result normal?
YES>To step 7.

No >Clean and change the default parts.

7 . Check high pressure fuel pump actuator circuit
(a) Ignition switch: OFF.
(b) Disconnect the battery negative cable.
(c) Check whether high pressure fuel pump actuator circuit can work properly.

Is the inspection result normal?
YES>To step 8.

NO >Repair or replace fuel pump actuator wire harness.

8 . Check pressure of the fuel system
(a) Check pressure of the fuel system. ( Refer to " Chapter 13 Fuel system, Precaution")

Is the inspection result normal?
YES>To step 9.
NO >Repair or replace fuel system components. If the pressure is too low, go to step
10.

9 . Check the fuel supply of the fuel system

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