Maintenance manual for sunray hfc4da1-2c china-IV diesel engines
173
— Additional accessories after sale
— Secondary ignition wires or coils
— Solenoid valve
— Relay
— Motor
In the case of idle running or deceleration, air flow goes through sensor may reach its minimum and this may lead to
DTC occurrence. Check down stream of mass air flow sensor for vacuum leaks. Check mass air flow sensing elements
for affixed dirt or scraps. Check intake system for water penetration. Once there is water in mass air flow sensor, it
will lead to sensor deviation and DTC occurrence.
Wide open throttle during vehicle acceleration for starting may lead to rapid parameter increase of mass air flow
sensor on fault diagnostic apparatus. In other words, 3-10g/sec during idle running will increase to 150g/sec for shift
from the 1
st
gear to the 2
nd
. If parameters do not increase, check intake system and exhaust system for clogging.
Check engine coolant temperature sensor for deviation or lag.
In the case of too high resistance in ignition 1 voltage circuit (i.e. equals to or more than 15Ω), DTC occurs.
Terminal ECU
K12 Intake air temperature signal
K20 Intake air flow signal
K63 Ground signal
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