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Home >> Saab >> 1987 >> 900 L4-1985cc 2.0L DOHC >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Test Procedures >> E4 Checking the Temperature Sensor (NTC Resistor)
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E4 Checking the Temperature Sensor (NTC Resistor)

E4 Checking the temperature sensor (NTC resistor)

Tools:
- Multimeter




1 Unplug the control module connector and remove the cover.

2 Measure the resistance of the NTC resistor as shown in the table by connecting the multimeter test prods to the control module connector pins 2 (yellow; GL) and 11 (black; SV). Alternatively, unplug the NTC resistor connector and simply measure the resistance across the pins.

The resistance varies with coolant temperature as follows:
0° C (32°F) - * 5800 ohms
20° C (68°F) - 2600 ohms
100° C (212°F) - 180 ohms

3 It incorrect readings are obtained, disconnect the NTC resistor leads.

Measure the resistance of the NTC resistor as shown in the table above by connecting the multimeter test prods to the NTC resistor connecting pins.

If the readings obtained are still incorrect, fit a new NTC resistor.

If the NTC resistor is OK, check the wiring between pin 11 (back; SV) of the control module and ground, and between the NTC resistor and ground.

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