FUEL SYSTEM <4D5-step
III
> - Troubleshooting
13-13
Code No. 15 Engine coolant temperature sensor system
Probable cause
Range of Check
D
Ignition switch: ON, except for during engine cranking
Set Conditions
D
The sensor output voltage for 3 seconds is 4.9 V or higher (the coolant
temperature is approximately -45
_
C or lower).
or
D
The sensor output voltage for 3 seconds is 0.2 V or lower (the coolant
temperature is approximately 140
_
C or higher).
D
Engine coolant temperature sensor inoperative
D
Engine coolant temperature sensor open circuit,
short circuit, or connector contact inoperative
D
Engine-ECU inoperative
OK
NG
NG
Repair
OK
OK
Repair
NG
Engine coolant temperature sensor check
(Refer to P.13-60.)
Replace the engine-ECU.
NG
Replace the engine-ECU.
OK
NG
OK
Repair
Check the following connector: A
-113
NG
Check the trouble symptoms.
NG
Measure at A-113 engine coolant temperature
sensor connector
D
Disconnect the connector and measure at
the harness side.
D
Voltage between 1 and the earth
(Ignition switch: ON)
OK:
4.1 - 4.9 V
D
Continuity between 2 and the earth
OK:
Continuity
Check the following connectors:
C-43, C-130
Check the harness between the
engine-ECU and the engine coolant
temperature sensor connector.
Check the trouble symptoms.
Replace
Code No. 16 Boost air temperature sensor (intake air
sensor) system
Probable cause
Range of Check
D
Ignition switch: ON, except for during engine cranking
Set Conditions
D
The sensor output voltage for 3 seconds is 4.6 V or higher (the intake air
temperature is approximately -45
_
C or lower).
or
D
The sensor output voltage for 3 seconds is 0.3 V or lower (the intake air
temperature is approximately 110
_
C or higher).
D
Boost air temperature sensor inoperative
D
Boost air temperature sensor open circuit, short
circuit, or connector contact inoperative
D
Engine-ECU inoperative
OK
Measure at C-136 boost air temperature
connector
D
Disconnect the connector and measure at
the harness side.
D
Voltage between 1 and the earth
(Ignition switch: ON)
OK:
4.0 - 5.3 V
D
Continuity between 2 and the earth
OK:
Continuity
NG
Check the following connectors:
C-43, C-130
NG
Repair
OK
OK
Repair
NG
Boost air temperature sensor check
(Refer to P.13-60.)
Check the trouble symptoms.
Replace the engine-ECU.
NG
Replace the engine-ECU.
OK
NG
OK
Repair
Check the following connector:
C-136
Replace
NG
Check the trouble symptoms.
NG
Check the harness between the
engine-ECU and the boost air temperature
sensor connector.