LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Plymouth >> 1991 >> Colt Base, Automatic >> Repair and Diagnosis >> Engine Performance >> Sensor Range Charts >> Engine Controls - Sensor Operating Range Charts >> Sensor Operating Range Charts
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Sensor Operating Range Charts

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.
COOLANT TEMP SENSOR RESISTANCE (1)

Temperature °F (°C) Ohms
Galant, Montero 3.0L, & Pickup 3.0L
32 (0) 5900
68 (20) 2500
104 (40) 2700
176 (80) 300
All Others
32 (0) 5900
68 (20) 2500
104 (40) 1100
176 (80) 300
(1) Measure resistance across disconnected sensor terminals.
EGR TEMP SENSOR RESISTANCE (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 except Montero.
INTAKE AIR TEMP SENSOR RESISTANCE (1)

Temperature °F (°C) Ohms
32 (0) 6000
68 (20) 2700
176 (80) 400
(1) On Stealth and 3000GT, measure resistance between terminals No. 5 and 6 of airflow sensor connector. On all other models measure resistance between terminals No. 4 and 6 of airflow sensor connector.
MOTOR POSITION SENSOR RESISTANCE TEST TERMINALS

Application (1) Terminals (2) Terminals
Colt Vista 1-3 1-2
Colt, Colt 200, & Summit 2-3 3-5
(1) Measure resistance between terminals of motor position sensor connector.
(2) Apply 6 volts between terminals No. 1 and 2 of idle speed control (ISC) connector. Check resistance between terminals of motor position sensor when ISC motor is activated.
MOTOR POSITION SENSOR RESISTANCE (1)

Condition Ohms
Connector Unplugged 4000-6000
6 Volts Applied Resistance Changes Smoothly
(1) See MOTOR POSITION SENSOR RESISTANCE TEST TERMINALS  table for terminal positions.
OXYGEN SENSOR VOLTAGE (1)(2)

Application Volts
All Models
Lean 0.1
Rich 1.0
(1) Measure between sensor terminal No. 1 and ground or between terminals No. 1 and 2.
(2) Test at normal operating temperature.
O2 SENSOR HEATING ELEMENT RESISTANCE (1)

Application (2) Temperature °F (°C) Ohms
Eclipse 2.0L Galant 2.0L, Mirage 1.6L 68 (20) 12
Montero 3.0L, Pickup 3.0L & Ram-50 3.0L 68 (20) 20
Stealth & 3000GT 3.0L (3) 68 (20) 20
(1) Measure between sensor terminals No. 3 and 4.
(2) Information on other models not available from manufacturer.
(3) Stealth and 3000GT turbo models have 2 oxygen sensors. Measure between sensor terminals No. 2 and 4 on rear sensor.
THROTTLE POSITION SENSOR (TPS) RESISTANCE

Application (1) Terminal (Ground-Out) Ohms
Colt Vista
Closed 2-1 3500-6500
Open (2) 2-3 3500-6500
Eclipse 2.0L (VINs R & U)
Closed 2-3 3500-6500
Open (2) 3-4 3500-6500
Pickup & Ram-50 3.0L
Closed 1-4 3500-6500
Open (2) 2-3 3500-6500
Stealth & 3000GT
Closed 4-1 3500-6500
Open (2) 4-2 3500-6500
All Others
Closed 1-4 3500-6500
Open (2) 2-4 3500-6500
(1) Measure across TPS terminals with connector disconnected.
(2) Resistance should increase smoothly.
VEHICLE SPEED SENSOR CONTINUITY TEST (1)

Application (2) Continuity
All Models 4 Changes Per Revolution
(1) Measure continuity at back of speedometer. See WIRING DIAGRAMS article.
(2) With ECU connector disconnected. Turn speedometer cable to cycle reed switch on and off.
VEHICLE SPEED SENSOR VOLTAGE TEST (1)

Application (2) Volts
All Models
Ignition switch OFF 1 Or Less
Ignition switch ON 4.5-4.9
(1) Measure voltage at back of speedometer. See WIRING DIAGRAMS article.
(2) With ECU connector disconnected. Turn speedometer cable to cycle reed switch on and off.
scientia non olet · About LEMON Manuals