Fuel System: 1G-3
Diagnostic Information and Procedures
Fuel System Diagnosis
B705H11704001
Condition Possible cause Correction / Reference Item
Engine will not start or
hard to start (Gasoline
does not reach the intake
pipe)
Clogging, bending or improper routing of
fuel filter or fuel hose.
Clean, replace or adjust.
Fuel pump failure. Replace.
Fuel pressure regulator failure. Replace.
Fuel pump injector failure. Replace.
Fuel pump relay failure. Replace.
ECM failure. Replace.
Wiring connection failure. Inspect or repair.
Engine will not start or
hard to start
Throttle position sensor improperly
adjusted.
Adjust.
Throttle position sensor failure. Replace.
Intake air pressure sensor failure. Replace.
ECM failure. Replace.
Engine temperature sensor failure. Replace.
Intake air pressure sensor failure. Replace.
Fuel pump failure. Replace.
Fuel hose improperly routed. Adjust.
Engine is likely to stop
(Improper air/Fuel ratio)
Fuel pump filter clogging. Clean or replace.
Fuel pump failure. Replace.
Fuel pressure regulator failure. Replace.
Engine is likely to stop
(Fuel injector function
failure)
ECM failure. Replace.
Injection signal not received from ECM. Repair or replace.
Lead wire disconnection or shorted. Repair or replace.
Battery failure or voltage too low. Replace or recharge.
Engine is likely to stop
(Control circuit or sensor
function failure)
ECM failure. Replace.
Fuel pressure regulator failure. Replace.
Throttle position sensor failure. Replace.
Fuel pump relay failure. Replace.
Engine is likely to stop
(Engine parts function
failure)
Fuel hose clogging.
Clean.
Engine operation failure
in high speed range
(Engine internal parts or
electrical equipment
failure)
ECM failure. Replace.
Insufficient fuel supply to injector due to
fuel hose blockage.
Clean and priming.
Fuel pump failure. Replace.
Throttle sensor failure. Replace.
Insufficient engine power
in high speed range
(Airflow system failure)
Air leakage from throttle body joint. Repair or replace.
Insufficient engine power
in high speed range
(Control circuit or sensor
failure)
Fuel pressure too low. Repair or replace.
Throttle position sensor failure. Replace.
ECM failure. Replace.
Throttle position sensor synchronization
failure.
Adjust.
Fuel tank pressure control valve failure. Replace.
Insufficient engine power
(Engine internal parts or
electrical equipment
failure)
Injector clogged. Clean.
Throttle position sensor adjustment
failure.
Replace.
Air leakage from throttle or vacuum
hose.
Retighten or replace.
Fuel pump or ECM failure. Replace.
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