1999 Saab 9-3 Base, 2D Convertible, AutomaticFACTORY OEM SERVICE PROCEDURE

Engine Controls - Sensor Operating Range Charts: 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.
CRANKSHAFT POSITION SENSOR RESISTANCE

System Ohms
9-3
Trionic T-5 Engine Mnagement System (1) 485-595
Trionic T-7 Engine Management System (2) 770-950
9-5 (2) 770-950
(1) Measure resistance between sensor terminals No. 1 (Yellow wire) and 2 (Black wire) at around 68°F (20°C).
(2) Measure resistance between both sensor terminals at around 68°F (20°C).
ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE (1)

Temperature - °F (°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
230 (110) 140-160
(1) Measure resistance between sensor terminals.
HEATED OXYGEN SENSOR (HO2S) VOLTAGE

Condition Volts
Lean .1-0.4
Rich 0.6-0.9
INTAKE AIR TEMPERATURE (IAT) SENSOR RESISTANCE (1)

Temperature - °F (°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 resistance between sensor terminals.
MASS AIR FLOW FREQUENCY (1)

Air Flow (Grams/Second) Frequency (Hertz)
0 100-300
1 1045
1.5 1312
2 1527
3.5 2012
5 2355
7.5 2788
10 3134
15 3678
20 4095
30 4764
40 5289
50 5730
60 6114
80 6753
100 7286
120 7743
140 8158
(1) Connect oscilloscope at MAF sensor to Green/Blue wire on 9-3 or Pink/White wire on 9-5 Series. Use scan tool to monitor air flow.
MAP SENSOR VOLTAGES - 9-3 SERIES WITH TRIONIC T-5

Vacuum/Pressure Applied Voltage Readings
Vacuum Applied (In. Hg)
20.1 0.48
13.4 0.95
0.0 1.9
Pressure Applied (psi)
3.6 2.4
7.3 2.8
10.9 3.3
MAP/CAAP SENSOR VOLTAGES - 9-3 TRIONIC T-7 & 9-5 (1)

Vacuum/Pressure Readings Voltage Reading
Vacuum Applied (In. Hg)
20.1 0.9
13.4 1.3
0.0 2.1
Pressure Applied (psi)
3.6 2.5
7.3 2.9
11 3.3
(1) Connect DVOM to ground with one lead, and backprobe Yellow/Red wire on CAAP sensor, or Brown/Orange wire on MAP sensor with the other lead
.
THROTTLE POSITION SENSOR RESISTANCE/VOLTAGE - 9-3 TRIONIC T-5

Sensor/Connector Pins No. K/Ohms (1) (2) Volts
1 (White/Black wire) - 2 (Black Wire) 1.6-2.4 4.9-5.1
2 (Black Wire) - 3 (Green/Black Wire) With Throttle Closed 0.8-1.2 0.1-0.9
2 (Black Wire) - 3 (Green/Black wire) At Wide-Open Throttle 2.0-3.0 4.1-4.9
(1) Measure at sensor terminals with harness connector removed.
(2) Backprobe sensor harness connector with ignition on.
THROTTLE/PEDAL POSITION SENSOR VOLTAGES - 9-3 TRIONIC T-7 & 9-5

Sensor - Throttle/Pedal Position Backprobe Terminals No. Voltage
Throttle Position Sensor 1
Closed 6-9 0.065-1.090
Open 6-9 3.930-4.775
Throttle Position Sensor 2
Closed 8-9 3.910-4.935
Open 8-9 0.025-1.070
Pedal Position Sensor 1
Released 1-9 3.990-4.645
Depressed 1-9 0.400-1.055
Pedal Position Sensor 2
Released 3-9 0.355-1.010
Depressed 3-9 3.945-4.600
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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.