Common trouble and elimination
C-22
CNG public bus gas feeding system
Breakdown
type
Breakdown reason distinguish method
Disposal way
Engine no high
speed
First turn on power switch, then open CNG
low pressure filter contamination drain mouth
to check CNG discharge pressure:
a. Cannot hear s~s~ sound, then it is CNG
first stage reductor outlet flow quantity to
low;
b. Can hear s~s~ sound then ask engine
company check engine.
a. Replace or report for repair
to Lantianda.
b. Report for repair to CNG
engine company.
Some times
engine
flameout
First turn on power switch, then open CNG
low pressure filter contamination drain mouth
to check CNG discharge pressure:
a. Cannot hear s~s~ sound, then it is CNG
first stage reductor outlet flow quantity is not
stable;
b. Can hear s~s~ sound then ask engine
company check engine.
a. Replace or report for repair
to Lantianda.
b. Report for repair to CNG
engine company.
Engine can not
ignite vehicle
a. First check the pressure gauge on CNG
control panel, if pointer is zero (confirm gas
cylinder have gas);
If above method cannot exclude breakdown,
then please first turn on power switch, then
open CNG low pressure filter contamination
drain mouth to check CNG discharge
pressure:
b. Cannot hear s~s~ sound, then it is CNG gas
feeding system breakdown;
c. Can hear s~s~ sound then ask engine
company check engine.
a. Ask driver repeat open and
close instrument panel’s power
switch for 4 to 6 times, every
time interval 3 to 5 seconds.
Observe the pressure gauge’s
pointer on control panel, if
reading is normal, then can
start up engine.
b. Replace or report for repair
to Lantianda.
c. Report for repair to CNG
engine company.
Engine is easy
flameout
a. Check reductor hot water’s in and out pipe,
to see if have block or leaking phenomenon
b. Check circuit to see if have drop wire or
empty interface phenomenon.
a. Self disposal, or report for
repair to Lantianda company;
b. Self exclude;
CNG low
pressure alarm
light lighted
a. High pressure filter block
b. First stage reductor outlet pressure or flow
quantity to low
c. First stage reductor filter core block
a. clean or replace filter core
b. replace or report for repair
to Lantianda
c. clean or replace filter core
When gas
refilling can
not refill
a. Check whether charging ball valve is open
b. Check whether gas cylinder valve is open
c. Charging valve, ball valve or pressure
gauge breakdown
d. self exclude
e. self exclude
f. replace or report for repair to
Lantianda
Содержание XMQ6900J series
Страница 116: ...Common trouble and elimination C 16 Fault symptom Possible cause Eliminating method speed...
Страница 128: ...Appendix A 4 Air braking schematic diagram...
Страница 129: ...Appendix A 4 Electric schematic diagram of the complete vehicle 1...
Страница 130: ...Appendix A 4 Electric schematic diagram of the complete vehicle 2...
Страница 131: ...Appendix A 4 Electric schematic diagram of the complete vehicle 3...
Страница 132: ...Appendix A 4 Electric schematic diagram of the complete vehicle 4...
