Engine Controls - Sensor Operating Range Charts: Introduction: Notes

1994 Plymouth Colt Vista SE, StandardSECTION 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. For connector and terminal identification, see WIRING DIAGRAMS article in the ENGINE PERFORMANCE Section.
AIRFLOW METER HERTZ TEST (1)

Condition Hz
1.8L
750 RPM 23-49
2000 RPM 51-91
2.4L
750 RPM 18-44
2000 RPM 43-83
(1) Measure hertz frequency with Multi-Use Tester (MUT-II).
COOLANT TEMPERATURE SENSOR RESISTANCE

Temperature °F (°C) Ohms
32 (0) 5800
68 (20) 2400
104 (40) 1100
176 (80) 300
EGR TEMPERATURE SENSOR RESISTANCE TEST (1)(2)

Temperature °F (°C) Ohms
122 (50) 60-83
212 (100) 11-14
(1) Measure resistance across disconnected sensor terminals.
(2) Specifications apply to all models.
INTAKE AIR TEMPERATURE SENSOR RESISTANCE

Temperature °F (°C) Ohms
32 (0) 6000
68 (20) 2700
176 (80) 400
OXYGEN SENSOR VOLTAGE TEST (1)

Application Volts
Lean 0.1
Rich 1.0
(1) Test at normal operating temperature.
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

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

Affiliate disclosure: We may earn a commission at no extra cost to you.

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.