FUEL INJECTION SYSTEM
8-68
5 The fuel pressure is too low. • Compare the fuel pressures at
idle and with throttle open.
• About the same → Normal
• Too low → Refer to the following
table.
• Check the fuel pump.
• Replace if defective.
Refer to “CHECKING THE
FUEL PUMP BODY” on page
7-2.
• Check the delivery hose for
pinching or kinking.
• Repair or replace if there is a
malfunction.
• Check the pressure regulator.
• Replace if defective.
Refer to “CHECKING THE
FUEL PRESSURE” on page
7-7.
• Check the throttle position sen-
sor.
• Execute the diagnostic mode.
(Code No.01)
• Replace if defective.
• Check the fuel system (discon-
nection, etc.).
• Repair or replace if there is a
malfunction.
• Check the intake system (im-
proper sealing, etc.).
• Repair or replace if there is a
malfunction.
Fault code No. 31 Symptom The amount of air-fuel ratio feedback compensation is
maintained continuously in the vicinity of the upper limit
(lean air-fuel ratio).
Diagnostic code No. 01 Throttle position sensor
Order Item/components and probable
cause
Check or maintenance job Reinstatement
method
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