Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSLINCOLN1985MARK VII L6-146 2.4L DSL TURBOREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSVEHICLE SPEED SENSORTESTING AND INSPECTIONSPEED SENSOR TEST
1985 Lincoln Mark VII L6-146 2.4L DSL Turbo
Speed Sensor Test
1985 Lincoln Mark VII L6-146 2.4L DSL TurboSECTION Speed Sensor Test
ANALOG INSTRUMENT CLUSTER
1. Disconnect electrical connector from speed sensor and connect an ohmmeter between the speed sensor terminals at speed sensor end.
2. A reading of approximately 30---100 ohms for 1982 models and 1983 Escort, EXP, LN7 and Lynx or approximately 200---300 ohms for 1983---87 models should be obtained. A reading of 0 ohms indicates a shorted coil and maximum reading indicates an open coil.
3. Replace the sensor if a correct reading has not been obtained.
ELECTRONIC INSTRUMENT CLUSTER
NOTE: On vehicles equipped with an electronic speedometer, the speed signal is provided by the electronic speedometer rather than the speed sensor. Do not perform the speed sensor test on vehicles equipped with an electronic speedometer.
1. Connect an AC voltmeter to terminal 150 and the ground leads to the amplifier.
2. With the wheels raised and the vehicle speed at 48 kph (30 mph), the AC voltmeter should read approximately 6-24 volts.
3. Measure DC voltage at the same terminal at 48 kph (30 mph). If voltage is greater than 1 volt DC, replace the speedometer.
4. Disconnect the 6 pin connector at the amplifier and repeat step # 2. If the reading is greater than 6 volts, replace the speed control amplifier.
5. Check circuit 150 (DG/W) from speed control amplifier to speedometer for shorts to ground or battery.
1. Disconnect electrical connector from speed sensor and connect an ohmmeter between the speed sensor terminals at speed sensor end.
2. A reading of approximately 30---100 ohms for 1982 models and 1983 Escort, EXP, LN7 and Lynx or approximately 200---300 ohms for 1983---87 models should be obtained. A reading of 0 ohms indicates a shorted coil and maximum reading indicates an open coil.
3. Replace the sensor if a correct reading has not been obtained.
Speed signal test:
ELECTRONIC INSTRUMENT CLUSTER
NOTE: On vehicles equipped with an electronic speedometer, the speed signal is provided by the electronic speedometer rather than the speed sensor. Do not perform the speed sensor test on vehicles equipped with an electronic speedometer.
1. Connect an AC voltmeter to terminal 150 and the ground leads to the amplifier.
2. With the wheels raised and the vehicle speed at 48 kph (30 mph), the AC voltmeter should read approximately 6-24 volts.
3. Measure DC voltage at the same terminal at 48 kph (30 mph). If voltage is greater than 1 volt DC, replace the speedometer.
4. Disconnect the 6 pin connector at the amplifier and repeat step # 2. If the reading is greater than 6 volts, replace the speed control amplifier.
5. Check circuit 150 (DG/W) from speed control amplifier to speedometer for shorts to ground or battery.
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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.