Test Step 4. Measure the Resistance of the Sensor at the Sensor

258

TM 9-2320-312-24-2

Troubleshooting Section

B. Check the harness and the wiring for abrasion

K. Use the following procedure to measure the

and pinch points from the sensor back to the

sensor resistance (Ohms) for the top camshaft

ECM.

position sensor:

C. Disconnect the suspect sensor from the engine

Refer to Illustration 93.

harness.

a. Use a multimeter to measure the resistance

D. Thoroughly inspect ECM engine harness

from P2:48 (Top Camshaft Speed/Timing

connectors for the sensors J401/P401 or

Sensor Positive) to P2:49 (Top Camshaft

J402/P402. Refer to Troubleshooting, "Electrical

Speed/Timing Sensor Negative).

Connectors - Inspect" for details.

b. Check for an intermittent open circuit or

E. Use the following procedure to measure the

short circuit by moving the harness while the

sensor resistance (Ohms) for the camshaft

measurement for resistance is being taken.

position sensor at the sensor connector between

Pull the wires that are directly behind the

terminal A and Terminal B:

sensors or shake the wires that are directly

behind the sensors.

a. Use a multimeter to measure the sensor

resistance (Ohms) from J401:B (E964-WH)

Resistance ........................... 75 to 230 Ohms

to J401:A (E963-BK).

L. Use the following procedure to measure the

Terminal B of the sensor connector is Top

sensor resistance (Ohms) for the bottom

Camshaft Speed/Timing Positive.

camshaft position sensor:

Terminal A of the sensor connector is Top

Refer to Illustration 93.

Camshaft Speed/Timing Negative.

a. Use a multimeter to measure the sensor

Resistance ............................ 75 to 230 Ohms

resistance (Ohms) from P2: 58 (Bottom

Camshaft Speed/Timing Positive) to P2:59

F. Use the following procedure to measure the

(Bottom Camshaft Speed/Timing Negative).

sensor resistance (Ohms) for the bottom

camshaft position sensor at the sensor connector

b. Check for an intermittent open circuit or

between terminal A and terminal B:

short circuit by moving the harness while the

measurement for resistance is being taken.

a. Use a multimeter to measure the sensor

Pull the wires that are directly behind the

resistance (Ohms) from J402:B (E966-YL) to

sensors or shake the wires that are directly

J402:A (E965-BU).

behind the sensors.

Terminal B of the sensor connector is Bottom

Resistance ....................... 600 to 1800 Ohms

Camshaft Speed/Timing Positive.

Expected Result:

Terminal A of the sensor connector is Bottom

Camshaft Speed/Timing Negative.

The readings agree with the values that are listed

above.

Resistance ....................... 600 to 1800 Ohms

Results:

Note: Timing calibration is not necessary following

OK Neither a short circuit nor an open circuit is

replacement of the speed/timing sensors. Refer to

the information in the System Operation Section

indicated. Proceed to Test Step 5.

regarding the installation of sensors.

Not OK The sensor resistance is not within the

Expected Result:

acceptable range when the sensor resistance is

measured through the engine harness. Proceed

The readings agree with the values that are listed

to Test Step 4.

above.

Test Step 4. Measure the Resistance of

the Sensor at the Sensor

Results:

OK The sensor resistance is correct. Proceed

A. Turn the ignition key switch to the OFF position.

to Test Step 5.