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6-18
FI
Engine temperature sensor open or short circuit is detected.
1
2
3
4
Fault code No.
28 Symptom
Used diagnostic code No. D11 (engine temperature sensor)
Order
Inspection operation item and
probable cause
Operation item and countermeasure
Reinstatement
method
Reinstated by turn-
ing the main switch
ON.
Installed condition of sensor
Connected condition of con-
nector
Inspect the coupler for any
pins that may have pulled
out.
Check the locking condition
of the coupler.
Open or short circuit in wiring
harness.
Defective engine temperature
sensor.
Check the installed area for looseness or
pinching.
If there is a malfunction, repair it and connect
it securely.
Engine temperature sensor coupler
Main wiring harness ECU coupler
Repair or replace if there is an open or short
circuit.
Between sensor coupler and ECU coupler
black/blue-black/blue
green/red - green/red
Execute the diagnostic mode (code No.D11)
Replace if defective.
No normal signal is received from the O
2
sensor.
1
2
3
4
5
Fault code No.
24 Symptom
Used diagnostic code No. --
Order
Inspection operation item and
probable cause
Operation item and countermeasure
Reinstatement
method
Reinstated by start-
ing the engine, oper-
ating it at idle, and
then racing it after it
has warmed up.
Defective O
2
sensor.
Open or short circuit in wiring
harness.
Installed state of O
2
sensor.
Connected state of connector
Inspect the coupler for any
pins that may have pulled
out.
Check the locking condition
of the coupler.
Check fuel pressure
Replace if defective.
Repair or replace if there is there is an open
or short circuit.
Main wiring harness
black/blue – gray/green
red/black – black/green
Check the installed area for losseness or
pinching.
If there is a malfunction, repair and connect it
securely.
O
2
sensor coupler
Main wiring ECU harness coupler
Refer to “CHECKING THE FUEL PUMP AND
PRESSURE REGULATOR OPERATION.
FUEL INJECTION SYSTEM
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