1995 Saab 900 SE, 2D Hatchback, StandardFACTORY OEM SERVICE PROCEDURE

Engine Controls - Sensor Operating Range Charts - 2.0L Turbo: Introduction

Sensor operating range information can help determine if a sensor is out of calibration. An out-of-calibration sensor may not set a trouble code, but it may cause driveability problems.

NOTE: Unless stated otherwise in test procedure, perform all voltage tests with a Digital Volt-Ohmmeter (DVOM) with minimum 10-megohm input impedance.
ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE (1)

Temperature - Β°F (Β°C) Ohms
-22 (-30) 20,000-30,000
68 (20) 8300-10,600
104 (40) 2300-2700
140 (60) 565-670
176 (80) 295-365
194 (90) 200-240
230 (110) 140-160
(1) Measure resistance between sensor terminals.
INTAKE AIR TEMPERATURE (IAT) SENSOR RESISTANCE (1)

Temperature - Β°F (Β°C) Ohms
-22 (-30) 20,000-30,000
14 (-10) 7000-11,400
68 (20) 2100-2900
104 (40) 1000-1300
140 (60) 565-670
176 (80) 295-365
194 (90) 240-260
(1) Measure voltage between sensor terminals.
MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR VOLTAGE (1)

Pressure - In. Hg Volts
-22.5 0.5
-15.0 0.9
0 1.8
7.5 2.3
15.0 2.8
22.5 3.3
(1) Measure voltage between terminals No. 1 and No. 2.
HEATED OXYGEN SENSOR (HO2S) VOLTAGE

Condition Volts
Lean 0-0.4
Rich 0.6-1.0
THROTTLE POSITION (TP) SENSOR RESISTANCE

Position Ohms
Total Resistance (1) 1600-2400
Idle Position (2) 800-1200
Wide Open Throttle (2) 2000-3000
(1) Measure resistance between terminals No. 1 and 2.
(2) Measure resistance between terminals No. 2 and 3.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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