LL3 Check Front Left Sensor Output at Speed Sensor

- Disconnect the speed sensor connector at the left radiator support.

- Place in 4x4 low mode. Key ON and allow wheels to spin and stabilize at engine idle speed.

- Set the meter to the frequency counter (Hz) setting. Measure and record the frequency between the two pins of the speed sensor component connector.

NOTE: Measurements of both the frequency and the voltage output must be taken. The actual speed the wheels are turning is not important -- the result of voltage output divided by the frequency will not change with wheel speed. However, it is crucial that both the frequency measurement and the voltage measurement be taken at the same wheel speed.

- Change the meter to the A/C mV setting. Measure and record the voltage output between the two pins of the speed sensor component connector.

- Determine the sensor output in mV/Hz - Output -- A/C Voltage/Frequency

- Is the sensor output greater than 3.0 mV/Hz?

YES -- Output indicates that air gap and speed sensor strength are OK at the speed sensor. Go to LL7. LL7 Check For Wiring Intermittents

NO -- Replace speed sensor. Go to LL4. LL4 Check Speed Sensor/Tone Ring Air Gap