Page 295 - Foton Workshop Manual - Sauvana

ENGINE MECHANICAL - ENGINE MECHANICAL 12B-5

Malfunction Possible cause Reference
symptom

Renew the ignition of the cylinder of failure
Postignition(the 1.The failure of the cylinder in the timely. If it cannot be renewed temporarily,
temperature of process of the ignition of engine disconnect the connector of the fuel injector
the exhaust is on this cylinder to protect the ternary catalytic
extremely high) converter
2.Breakdown of engine exhaust valve Repair the engine

1.The state of engine is abnormal Check and maintain the engine
2.Electronic control fuel injection is Check and maintain the electronic injection 12B
abnormal system

3.The exhaust manifold or the joint of Fasten related bolts, change spacer if
the ternary catalytic converter leak necessary
gas
4.Air leakage of the screw thread of
the oxygen sensor for the exhaust Fasten oxygen sensor
system

5.The control valve of the oil supply Change the fuel pump
system is damaged
Test excess
emission by 6.Use exceeding term for ternary Replace the ternary catalytic converter and
method of catalytic converter and oxygen oxygen sensor (use them under the standard
operating mode sensor conditions with the life span less than
80000km)
7.Damaged caused by heavy metal
poisoning or overheating of ternary Change catalytic converter and oxygen
catalytic converter and oxygen sensor
sensor
8.Sulfur poisoning of ternary catalytic Run 10 minutes at 3- gear shift and 70 km/h
converter and oxygen sensor speed

9.Grounding of ECM or electronic
control fuel injection system is not in Improve the position of system ground wire
good condition
10.Earth of casing of ECM Make the ECM case shell insulated

Check whether
the exhaust
exceeds the
standard with 1.The engine is not warmed-up fully Warm-up engine
the operating
condition
method

Page 295