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HOMESERVICE MANUALSSUZUKI2013SX4 CROSSOVER, AUTOMATIC CVT TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 98 (DIFFERENTIAL ASSEMBLY)DIAGNOSTIC INFORMATION AND PROCEDURESDTC C1251: COUPLING AIR TEMPERATURE SENSOR CIRCUIT SHORTTROUBLESHOOTING
2013 Suzuki SX4 Crossover, Automatic CVT Trans

DTC C1251: Coupling Air Temperature Sensor Circuit Short: Troubleshooting

2013 Suzuki SX4 Crossover, Automatic CVT TransSECTION Troubleshooting
WARNING: This page is about a different car, the 2011 Suzuki SX4. However, it is still accessible from the selected car via links, so may be relevant.
C1251: SYMPTOM TROUBLESHOOTING REFERENCE CHART

Step Action YES NO
1  Was "4WD control system check" performed?  Go to Step 2. Go to 4WD CONTROL SYSTEM CHECK .
2  Coupling air temperature sensor circuit check 
  1. Disconnect connector from coupling air temperature sensor with ignition switch turned OFF.
  2. Check for proper connection to "YEL/BLK" and "BLU/WHT" terminals of coupling air temperature sensor connector.
  3. If connection is OK, measure voltage between "YEL/BLK" terminal of coupling air temperature sensor connector and vehicle body ground with ignition switch turned ON.

Is it 4 - 6 V? 		 Go to Step 3. Go to Step 5.
3  Coupling assembly ground circuit check 
  1. Disconnect connector from 4WD control module with ignition switch turned OFF.
  2. Measure resistance between "BLU/WHT" terminal of coupling air temperature sensor connector and "G26-24" terminal of 4WD control module connector with ignition switch turned OFF.

Is resistance above 1 MΩ? 		 Go to Step 4. "BLU/WHT" wire is shorted to ground circuit.
4  Coupling air temperature sensor check 
  1. Check coupling air temperature sensor referring to COUPLING AIR TEMPERATURE SENSOR INSPECTION .

Is it in good condition? 		 Substitute a known-good 4WD control module and recheck. Replace coupling air temperature sensor.
5  Coupling assembly circuit check 
  1. Disconnect connector from 4WD control module with ignition switch turned OFF.
  2. Check for proper connection to "G26-25" and "G26-24" terminals of 4WD control module connector.
  3. If connection is OK, measure resistance between "G26-25" terminal of 4WD control module connector and vehicle body ground.

Is resistance above 1 MΩ? 		 "YEL/BLK" wire is shorted to ground circuit. Substitute a known-good 4WD control module and recheck.
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