1990 Ford Probe GL, AutomaticFACTORY OEM SERVICE PROCEDURE

Act, ECT & Vat Sensor Specifications

NOTE: For resistance test, measure resistance across sensor terminals.
ECT, ACT & VAT SENSORS RESISTANCE & VOLTAGE SPECIFICATIONS (EXCEPT 2.2L PROBE)

Sensors °F (°C) Specifications Volts (K Ohms)
ECT & ACT (Except 2.2L Probe) 
248 (120) 0.27 (1.18)
230 (110) 0.35 (1.55)
212 (100) 0.46 (2.07)
194 (90) 0.60 (2.80)
176 (80) 0.78 (3.84)
158 (70) 1.02 (5.37)
140 (60) 1.33 (7.70)
122 (50) 1.70 (10.97)
104 (40) 2.13 (16.15)
86 (30) 2.60 (24.27)
68 (20) 3.07 (37.30)
50 (10) 3.51 (58.75)
VAT 
248 (120) 0.38 (0.11)
230 (110) 0.46 (0.14)
212 (100) 0.56 (0.19)
194 (90) 0.76 (0.25)
176 (80) 0.95 (0.33)
158 (70) 1.19 (0.44)
140 (60) 1.49 (0.60)
122 (50) 1.84 (0.83)
104 (40) 2.23 (1.18)
86 (30) 2.65 (1.70)
68 (20) 3.07 (2.50)
50 (10) 3.46 (3.77)
ECT & VAT SENSORS (PROBE 2.2L)

Temperature °F (°C) Voltage (1) Resistance Ohms
-4 (-20) 4.70 10-20
32 (0) 3.40 4-7
68 (20) 2.50 2-3
104 (40) 2.00 0.9-1.3
140 (60) 1.20 0.4-0.7
176 (80) 0.70 0.2-0.4
(1) Measure resistance between sensor signal circuit and SIG RTN pin.
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

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.