Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSAAB19879000 L4-1985CC 2.0L DOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSCOOLANT TEMPERATURE SENSOR/SWITCH (FOR COMPUTER)TESTING AND INSPECTION
1987 Saab 9000 L4-1985cc 2.0L DOHC
Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
1987 Saab 9000 L4-1985cc 2.0L DOHCSECTION Testing and Inspection
Checking the Temperature Sensor
Tools:
- Multimeter
- Breakout box 86 11 006
The LH control module connector should be unplugged.
1 Connect the Breakout Box. Take temperature sensor readings by connecting the multimeter's test prods for:
LH 2.2
to control module connector pins 2 and 11
LH 2.4, 2.4.1 and 2.4.2
to control module connector pins 5 and 13
2 If the readings obtained are not OK, unplug the temperature sensor connector.
Take temperature sensor readings again. If the readings are still not OK, change the temperature sensor.
3 An ISAT scan tool can be used on M1991- cars equipped with LH 2.4 and LH 2.4.2. Select command code 250. The temperature will be shown on the ISAT scan tool display.
Tools:
- Multimeter
- Breakout box 86 11 006
The LH control module connector should be unplugged.
1 Connect the Breakout Box. Take temperature sensor readings by connecting the multimeter's test prods for:
LH 2.2
to control module connector pins 2 and 11
LH 2.4, 2.4.1 and 2.4.2
to control module connector pins 5 and 13
2 If the readings obtained are not OK, unplug the temperature sensor connector.
Take temperature sensor readings again. If the readings are still not OK, change the temperature sensor.
3 An ISAT scan tool can be used on M1991- cars equipped with LH 2.4 and LH 2.4.2. Select command code 250. The temperature will be shown on the ISAT scan tool display.
Table:
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.