Cold Dr-4 - Charge Temperature Sensor Circuit Check

1. Disconnect both connectors from the computer. Connect an ohmmeter between 10-pin connector cavity No. 9 and 12-pin connector cavity No. 10. Ohmmeter reading should be as shown in the CHARGE TEMPERATURE SENSOR RESISTANCE  table below.
   CHARGE TEMPERATURE SENSOR RESISTANCE
   
   

   Temperature °F (°C)	Ohms
   -40 to 20 (-40 to -7)	382,000-22,000
   50-100 (10-38)	36,000-3300
   140-245 (60-118)	3900-176

2. If resistance checks okay, proceed to COLD DR-5  . If resistance is not within specifications, disconnect the charge temperature sensor connector. Connect an ohmmeter between the charge temperature sensor terminals. Resistance should be as shown in the CHARGE TEMPERATURE SENSOR RESISTANCE  table.
   Fig 1: Measuring Charge Temperature Sensor Connector Resistance

   
3. If resistance is okay, repair wiring between computer and sensor for a short or open circuit. If resistance is not within specifications, replace charge temperature sensor.

Fig 2: Measuring Charge Temperature Sensor Resistance