019-039   Engine Position Sensor (EPS) Circuit

CAUTION  To reduce the possibility of connector damage, do not use probes or leads other than Part Number 3822758. The leads must fit tightly in the connector without expanding the pins in the connector.

Insert the test lead into pin 14 of the OEM sensor connector. Insert
the other test lead into pin 11.

Make sure the EPS is connected to the sensor harness.

Connect the alligator clips to the multimeter probes. Measure the resistance. The resistance value

must be 1000 to 2000 ohms. If the resistance is

not correct, there is a problem with the sensor wiring harness, provided the sensor has been previously checked.

Move the leads to pins 1 and 15. Measure the resistance. The multimeter

must show between 1000 and 2000 ohms. If the resistance is

not correct, there is a problem with the sensor harness, provided the sensor has been previously checked. Repair or replace the sensor harness. Refer to Procedure

019-043. If both resistance checks are within specification, the sensor circuit

must still be checked for a short circuit to ground and a short circuit from pin to pin.

Insert the test lead into pin 1. Touch the other multimeter probe to the engine block ground. Measure the resistance. The multimeter

must show an open circuit (more than 10M ohms).

Remove the test lead from pin 1 and place it into pin 15. Touch the other multimeter probe to the engine block ground. Measure the resistance. The multimeter

must show an open circuit (more than 10M ohms).

Remove the test lead from pin 15 and place it into pin 11. Touch the other multimeter probe to the engine block ground. Measure the resistance. The multimeter

must show an open circuit (more than 10M ohms).

Remove the test lead from pin 11 and place it into pin 14. Touch the other multimeter probe to the engine block ground. Measure the resistance. The multimeter

must show an open circuit (more than 10M ohms). If the resistance values in any of the previous checks are

not
within the specification, there is a short circuit to ground, provided the EPS sensor has been previously checked. Repair or replace the sensor harness. Refer to Procedure

019-043.

Disconnect the engine position sensor from the sensor harness. Insert the test lead into pin 1. Insert the other test lead into pin 2. Measure the resistance. The multimeter

must show an open circuit (more than 10M ohms).

Remove the test lead from pin 2 and place it into pin 3, then pin 4. Check all pins. Measure the resistance. The multimeter

must
show an open circuit (more than 10M ohms) at all pins except pin 15.

Insert one test lead into pin 11. Insert the other lead into pin 1, then pin 2, then pin 3. Check all pins. Measure the resistance. The multimeter

must show an open circuit (more than 10M ohms) at all pins except pin 14.

Remove the test lead from pin 11 and place it into pin 14. Insert the other test lead into pin 1. Measure the resistance. The multimeter

must show an open circuit (more than 10M ohms).

Remove the test lead from pin 1 and place it into pin 2, then pin 3. Check all pins. Measure the resistance. The multimeter

must
show an open circuit (more than 10M ohms) at all pins except pin 11.

Remove the test lead from pin 14 and place it into pin 15. Insert the other test lead into pin 2. Measure the resistance. The multimeter

must show an open circuit (more than 10M ohms).

Remove the test lead from pin 2 and place it into pin 3, then pin 4. Check all pins. Measure the resistance. The multimeter

must
show an open circuit (more than 10M ohms) at all pins except pin 1.

If the resistance values in any of the previous checks are

not within specification, there is a short circuit from pin 1, 11, 14, or 15 to any pin that measures less than 10M ohms. Repair or replace the sensor harness. Refer to Procedure

019-043.

Connect all components when the repair is complete.