Suzuki DF70A - Fuel System Diagnosis

1G-13 Fuel System:
12) After checking fuel pressure, remove fuel pressure
gauge.
13) Reconnect fuel line.
14) With the engine not running and ignition switch “ON”,
check the fuel system for leaks.
Fuel System Diagnosis
Z9J0111704002
4. Joint nut
4
I9J011170019-01
Condition Possible cause Correction / Reference Item
Engine will not start or
hard to start (Fuel does
not reach the fuel delivery
pipe).
Clogging, bending or improper routing of
fuel hose.
Clean, repair or replace.
Fuel pump failure. Replace.
Fuel pressure regulator failure. Replace.
Fuel injector(s) failure. Replace.
Wiring connection failure. Repair or replace.
Engine will not start or
hard to start.
Throttle position sensor failure. Replace.
MAP sensor failure. Replace.
ECM failure. Replace.
Cylinder temp. sensor failure. Replace.
IAT sensor failure. Replace.
High pressure fuel pump failure. Replace.
Fuel hose improperly routed. Reroute properly.
Unstable idling / trolling
or engine tends to stall.
Shift position sensor failure. Replace.
Throttle position sensor failure. Replace.
IAC control system failure. Check idle air control system.
IAC passage clogged. Clean.
ECM failure. Replace.
Wire continuity / connection failure. Repair or replace.
Fuel injector(s) clogged. Clean.
Fuel pressure regulator failure. Check fuel pressure. Replace if necessary.
High pressure fuel pump failure. Check fuel pump and its circuit. Replace.
Fuel filter clogged. Clean or replace.
Clogging, bending or improper routing of
fuel hose.
Clean, reroute, repair or replace.
Insufficient engine power
in high speed range (Air
intake system failure).
Air leakage from air intake system. Repair or replace.
Insufficient engine power
in high speed range
(Control circuit or sensor
failure).
Fuel pressure too low. Check fuel pressure. Repair or replace.
Throttle position sensor failure. Replace.
ECM failure. Replace.
Insufficient engine power
in high speed range
(Engine internal parts or
electrical equipment
failure).
Fuel injector(s) clogged. Clean.
Throttle position sensor failure. Replace.
ECM failure. Replace.
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