Page 519 - Foton Workshop Manual - Tunland (AT)

DIAGNOSTICS - ENGINE CONTROL SYSTEM 04-373

4 . Check crankshaft position sensor
(a) Use a diagnostic tool to read the data flow of the crankshaft position (CKP) sensor
shown on the diagnostic tool. And it should reach the specific value when starts.

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

NO >Check whether the sensor is assembled correctly or not, maintain or change the
harness, connector or damaged parts.

5 . Check the coolant temperature sensor , intake mass flow sensor and intake
manifold absolute pressure temperature sensor.
(a) Check the coolant temperature sensor, intake manifold absolute pressure temperature
sensor and intake mass flow sensor are installed correctly.
(b) Remove the coolant temperature sensor, intake manifold absolute pressure temperature
sensor and intake mass flow 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 the coolant temperature sensor , intake mass flow sensor and intake manifold
absolute pressure temperature sensor are dirty.
(e) Ignition switch: ON, read the data flow of the intake manifold absolute pressure
temperature sensor, intake mass flow sensor and the coolant temperature sensor
shown on the diagnostic tool.

Is the inspection result normal?
YES>To step 6.

No >Clean and change the default parts.

6 . Check the air intake system
(a) Check the vacuum degree of the intake pipe at idle.
(b) Check the air intake pipe joints, gaskets, and the EGR system, fuel steam system.
(c) Check whether the air filter has the filter elements blocked or not.

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

No >Clean and change the default parts.

7 . Check the electronic throttle valve
(a) Slightly step the accelerator pedal and start the motor. Check whether the motor can
start or not.

Check whether it can start or not?
YES>Check the throttle valve, clean up the carbon deposition. Check whether the
throttle valve is stuck or not. Repair or replace it if necessary,
NO >To step 8.

8 . Check high pressure fuel pump actuator circuit
(a) Ignition switch: OFF.

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