The Analog Sensor Supply provides power to all analog sensors. The engine has the following analog sensors: Fuel Pressure, Atmospheric Pressure, Coolant Temperature, Turbocharger Compressor Inlet Pressure, Engine Oil Pressure, Aftercooler Temperature, Turbocharger Compressor Outlet Pressure and Crankcase Pressure.
The ECM supplies 5.0 ± 0.5 VDC from the ECM connector J1/P1 to each analog sensor connector. The sensor return line connects to the ECM connector J1/P1.
The analog sensor supply is output short circuit protected. A short circuit to the battery will not damage the circuit inside the ECM.
Note: The analog sensors are not protected from overvoltage. Directly connecting the analog sensor to battery voltage can result in damage. If the CID-FMI 161-03 is logged, it is possible that all of the analog sensors have been damaged.
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| Illustration 1 | g00719755 |
Test Step 1. Check for Connector Damage.
- Turn the circuit breaker for the battery to the OFF position.
- Turn the ECS to the OFF/RESET position.
- Check all of the connectors and wiring for the following problems: damage, corrosion, abrasion and incorrect attachment.
Expected Result:
The connectors and wiring should be free of the following problems: damage, corrosion, abrasion and incorrect attachment.
Results:
- OK - Proceed to test step 2.
- Not OK -
Repair: Repair the connectors and/or wiring or replace the connectors and/or wiring.
Stop.
Test Step 2. Check the Harness for Shorts.
- Disconnect ECM connector J1/P1. Disconnect all of the analog sensors.
- Measure the resistance between the analog supply P1-36 and the analog return P1-30.
- Measure the resistance between the analog supply P1-36 and the engine ground.
- Measure the resistance between the analog returnP1-30 and the engine ground.
Expected Result:
Resistance should be more than 10,000 Ohms for each measurement.
Results:
- OK - Proceed to test step 3.
- Not OK -
Repair: Repair the connectors and/or wiring or replace the connectors and/or wiring.
Stop.
Test Step 3. Check Analog Sensor Supply Voltage.
- Reconnect ECM connector J1/P1.
- Turn the circuit breaker for the battery to the ON position.
- Turn the ECS to the STOP position.
- Measure the voltage between the analog supply P1-36 and the analog return P1-30.
Expected Result:
The supply voltage should be 5.0 ± 0.5 VDC.
Results:
- OK - The Analog Sensor Supply is producing the correct voltage. Proceed to test step 4.
- Not OK - Check that the ECM is receiving the correct voltage from the battery.
Repair: Repair the connectors and/or wiring or replace the connectors and/or wiring.
Stop.
Test Step 4. Check Analog Sensor Supply Voltage.
- Measure the voltage between socket A and socket B on the harness side of all analog sensor connectors. Ensure that you are measuring on the harness side of the connector since the sensors are disconnected.
Expected Result:
The supply voltage should be 5.0 ± 0.5 VDC.
Results:
- OK - Supply voltage is reaching all analog sensor connectors. Proceed to test step 6.
- Not OK - There is an open circuit in the harness or connectors. Proceed to test step A.
Test Step 5. Perform the following test: Electrical Power Supply
Results:
- OK - Stop.
- REPAIRED, OK - Stop.
Test Step 6. Check Analog Sensors for Shorts.
- Connect the analog sensor. Check the voltage between socket A and socket B of the sensor. Repeat this step for all of the analog sensors.
- Turn the ECS to the OFF/RESET position.
Expected Result:
The supply voltage should be 5.0 ± 0.5 VDC after each analog sensor is connected.
Results:
- OK - The analog sensor supply and the harness are OK. Stop.
- Not OK - The voltage is OK before the sensor is connected. The voltage is NOT OK after the sensor is connected. The sensor may be internally shorted.
Repair: Temporarily replace the sensor. Verify that the new sensor solves the problem before permanently installing the new sensor.
Stop.