Operation Manual

FUEL INJECTION SYSTEM
8-48
TIP
Work in a complete cold-engine condition.
6 ECU malfunction Replace the ECU.
Fault code No. 22
Item
Intake air temperature sensor: open or short circuit detected. (no
normal signals are received from the intake air temperature sensor.)
Fail-safe system
Able to start engine
Able to drive vehicle
Diagnostic code No. d:05
Meter display Displays the intake air temperature.
Procedure
Compare the actually measured intake air temperature with the
meter display value.
Item/components and
probable cause
Check or maintenance job
Sensor inspection proce-
dure
1 Connection of intake air tem-
perature sensor coupler
Check the connection of the
coupler is secure.
Disconnect the coupler, and
check each pin (for bending,
wear, or locking).
Poor connection → Connect it
securely, or repair/replace the
wire harness.
Place the main switch to the
ON position, and check the
fault code indication.
No fault code indicated. →
Recovered.
Fault code indicated. →
Check the next step.
2 Connection of wire harness
ECU coupler
Check the connection of the
coupler is secure.
Disconnect the coupler, and
check each pin (for bending,
wear, or locking).
Poor connection → Connect it
securely, or repair/replace the
wire harness.
Place the main switch to the
ON position, and check the
fault code indication.
No fault code indicated. →
Recovered.
Fault code indicated. →
Check the next step.
3 Continuity of wire harness Open or short circuit →
Replace the wire harness.
Black/blue–Black/blue
Brown/white–Brown/white
Place the main switch to the
ON position, and check the
fault code indication.
No fault code indicated. →
Recovered.
Fault code indicated. →
Check the next step.
Fault code No. 21
Item
Coolant temperature sensor: open or short circuit detected. (no nor-
mal signals are received from the coolant temperature sensor.)
Fail-safe system
Able to start engine
Able to drive vehicle
Diagnostic code No. d:06
Meter display Displays the coolant temperature.
Procedure
Compare the actually measured coolant temperature with the meter
display value.
Item/components and
probable cause
Check or maintenance job
Sensor inspection proce-
dure