MPI – Troubleshooting
13-9
Code No. 13 Intake air temperature sensor system Probable cause
Range of Check
D Ignition switch: ON
D Excluding 60 seconds after the ignition switch is turned to ON or immediately
after the engine starts.
Set conditions
D Sensor output voltage is 4.6 V or more (corresponding to an intake air temperature
of –45_C or less) for 4 seconds.
or
D Sensor output voltage is 0.2V or less (corresponding to an intake air temperature
of 125_C or more) for 4 seconds.
D Malfunction of the intake air temperature sensor
D Improper connector contact, open circuit or
short-circuited harness wire of the intake air
temperature sensor circuit
D Malfunction of the engine-ECU
OK
Check trouble symptom.
Check the intake air temperature sen-
sor. (Refer to P.13-32.)
NG
Replace air flow sensor.
OK
Measure at the air flow sensor connec-
tor A-25.
D Disconnect the connector, and
measure at the harness side.
D Voltage between 6 and earth
(Ignition switch: ON)
OK: 4.5–4.9 V
D Continuity between 5 and earth
OK: Continuity
NG
Check the following connector:
C-62
NG
Repair
OK
Check trouble symptom.
NG
Check the harness wire between the
engine-ECU and the intake air temper-
ature sensor connector.
NG
Repair
OK
Replace the engine-ECU.
OK
Check the following connector:
A-25
NG
Repair
NG
Code No. 14 Throttle position sensor (TPS) system Probable cause
Range of Check
D Ignition switch: ON
D Excluding 60 seconds after the ignition switch is turned to ON or immediately
after the engine starts.
Set conditions
D The sensor output voltage is 0.2 V or less for 4 seconds.
D Malfunction of the throttle position sensor
D Improper connector contact, open circuit or
short-circuited harness wire of the throttle position
sensor circuit
D Improper “ON” state of idle position switch
D Short circuit of the idle position switch signal line
D Malfunction of the engine-ECU
Check the throttle position sensor.
NG
Replace
OK
Measure at the throttle position sensor
connector A-16.
D Disconnect the connector, and
measure at the harness side.
D Voltage between 1 and earth
(Ignition switch: ON)
OK: 4.8–5.2 V
D Continuity between 4 and earth
OK: Continuity
NG
Check the following connector:
B-62
NG
Repair
OK
Check trouble symptom.
NG
Check the harness wire between the
engine-ECU and the throttle position
sensor connector.
NG
Repair
OK
Replace the engine-ECU.
OK
Check the throttle position sensor out-
put circuit.
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