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HOMESERVICE MANUALSGEO1991TRACKER LSI, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESENSOR RANGE CHARTSENGINE CONTROLS - SENSOR OPERATING RANGE CHARTSINTRODUCTIONNOTES
1991 Geo Tracker LSi, Automatic

Engine Controls - Sensor Operating Range Charts: Introduction: Notes

1991 Geo Tracker LSi, AutomaticSECTION Notes

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 using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance.
COOLANT TEMPERATURE SENSOR RESISTANCE

Temperature °F (°C) Ohms
0 (-18) 14,650
20 (-7) 8100
40 (4) 4780
70 (21) 2500
100 (38) 1250
160 (71) 400
210 (99) 190
EGR TEMPERATURE SENSOR RESISTANCE

Temperature °F (°C) Ohms
68 (20) 214,000-313,800
104 (40) 90,900-125,700
140 (60) 42,100-55,500
176 (80) 21,100-26,500
212 (100) 11,200-13,600
IAT SENSOR RESISTANCE

Temperature °F (°C) Ohms
0 (-18) 14,800
20 (-7) 8250
40 (4) 5200
70 (20) 2500
100 (38) 1300
160 (71) 450
210 (99) 200
OXYGEN SENSOR HEATER RESISTANCE

Application Ohms
Tracker 3-5.5
THROTTLE POSITION SENSOR (TPS) RESISTANCE

Condition Resistance (Ohms)
Between Terminals C & D (1) 0-500
Between Terminals C & D (2) No Continuity
Between Terminals A & D 3500-6500
Between Terminals B & D
At Idle (3) 300-2000
At Wide Open Throttle 2000-6500
(1) With .012" (.30 mm) feeler gauge installed between stop screw and lever.
(2) With .022" (.56 mm) feeler gauge installed between stop screw and lever.
(3) To position throttle valve at idle, apply approximately 18 in. Hg vacuum to throttle opener valve.
Fig 1: Identifying Throttle Position Sensor Terminals
G121570Courtesy of GENERAL MOTORS CORP.
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.