GDI ± Troubleshooting
13A-19
Code No.21 Engine coolant temperature sensor system Probable cause
Range of check
D After 60 seconds have passed since the engine have started
Set conditions
D Sensor resistance is 50 Ω or less for 4 seconds.
or
D Sensor resistance is 72 kΩ or more for 4 seconds.
D Malfunction of the engine coolant temperature
sensor
D Open circuit or short-circuited harness wire of the
engine coolant temperature sensor circuit
D Malfunction of the engine-ECU
Range of check
D After engine starts
Set conditions
D After 5 minutes or more have passed since the engine coolant temperature
after filtering has dropped from 40_C or more to less than this temperature
NG
Repair
NG
Repair
OK
Replace the engine-ECU.
NG
Repair
NG
OK
Check trouble symptom.
OK
Check the following connector: A-69
NG
Check the harness wire between the engine-ECU and the engine
coolant temperature sensor.
OK
Check trouble symptom.
OK
Measure at the engine coolant temperature sensor connector A-69.
D Disconnect the connector, and measure at the harness
side.
D Voltage between 1 and earth
(Ignition switch: ON)
OK: 4.5 ± 4.9 V
D Continuity between 2 and earth
OK: Continuity
NG
Check the following connectors: A-36, C-18, C-19
Check the engine coolant temperature sensor. (Refer to
P.13A-102.)
NG
Replace
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