ELECTRICAL SYSTEM TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
ENGINE PRESSURE SENSOR OPEN OR SHORT CIRCUIT TEST - CONTINUED
Disconnect sensor to create open circuit (WP 0065 00 or WP 0066 00).
Disconnect sensor connector of sensor with short circuit diagnostic code.
Turn engine start switch to ON position (TM 5-3805-290-10). Wait at least 15 seconds for activation of diagnostic
Use MSD to check Active Diagnostic Code screen. Check for open circuit diagnostic code.
Expected Results. Open circuit diagnostic code for disconnected sensor is now active.
If results are OK, short circuit diagnostic code was active before disconnecting sensor. Open circuit diag-
nostic code became active after disconnecting sensor. Proceed to step 7.
If results are NOT OK, a short circuit exists between sensor harness connector and ECM. Leave sensor
disconnected. Proceed to step 9.
Measure sensor supply voltage.
Disconnect sensor from engine harness.
Connect a 3-terminal breakout T to engine harness only. DO NOT connect sensor to breakout T.
Measure voltage from terminal A (5V supply) to terminal B (sensor common).
Expected Results. The dc voltage from terminal A to terminal B measures 4.5 to 5.5 VDC.
If results are OK, sensor supply voltage is correct. Remove breakout T. Proceed to step 8.
If results are NOT OK, sensor supply voltage is out of expected range. Continue testing sensor supply cir-
cuit. Perform 5V Engine Pressure Sensor Supply Circuit Test in this work package.