MBE 900 DDEC VI Troubleshooting – Section 117.3 SPN 3563/FMI 4

Section 117.3
SPN 3563/FMI 4

The following procedures will troubleshoot SPN 3563/FMI 4, Intake Manifold Pressure/Temp Sensor short to ground.‪

Section 117.3.1
Open or Short to Ground Check

Check as follows:‪

1. Check for multiple codes.
   1. If faults 3563/4 and 1636/4 are present, go to step 2 .
   2. If only 3563/4 is present, go to step 7 .
2. Disconnect the Intake Manifold Pressure/Temp Sensor.
3. Measure the resistance between pins 1 and 2 of the Intake Manifold Pressure/Temp Sensor. See Figure "Intake Manifold Pressure/Temp Sensor" .
   

   Figure 1. Intake Manifold Pressure/Temp Sensor

   1. If resistance is greater than 130k Ω, replace the sensor.Refer to "117.3.1.1 Verify Repairs" .
   2. If resistance is less than 130k Ω, go to step 4 .
4. Measure the resistance between pins 2 and 4 of the Intake Manifold Pressure/Temp Sensor. See Figure "Intake Manifold Pressure/Temp Sensor" .
   1. If resistance is greater than 130k Ω, replace the sensor.Refer to "117.3.1.1 Verify Repairs" .
   2. If resistance is less than 130k Ω, go to step 5 .
5. Turn the ignition ON (key ON, engine OFF).
6. Measure the voltage between pin 2 of the Intake Manifold Pressure/Temp Sensor and ground.
   1. If the voltage is greater than 2.75 volts, repair the open between pin 4 of the Intake Manifold Pressure/Temp Sensor and pin 102 of the 120–pin MCM connector. Refer to "117.3.1.1 Verify Repairs" .
   2. If the voltage is less than 2.75 volts, repair the open between pin 2 of the Intake Manifold Pressure/Temp Sensor and pin 108 of the 120–pin MCM connector. Refer to "117.3.1.1 Verify Repairs" .
7. Turn the ignition OFF.
8. Disconnect the Intake manifold Pressure/Temp Sensor.
9. Disconnect the 120–pin MCM connector.
10. Measure the resistance between pins 1 and 2 of the Intake Manifold Pressure/Temp Sensor harness connector.
    1. If the resistance is greater than 5 Ω, repair the short to power on the circuit between pin 87 of the 120–pin MCM connector and pin 1 of the Intake Manifold Pressure/Temp Sensor harness connector. Refer to "117.3.1.1 Verify Repairs" .
    2. If the resistance is less than 5 Ω, repair the short between wires 58 and 87 of the 120–pin MCM connector. Refer to "117.3.1.1 Verify Repairs" .

Section 117.3.1.1
Verify Repairs

Verify repairs as follows:‪

1. Turn ignition OFF.
2. Reconnect any electrical connections that were disconnected to perform the diagnosis.
3. Clear codes with DDDL 7.0 or latest version.
4. Start and bring engine up to operating temperature (over 140°F/60°C).
5. Verify operation is satisfactory and no warning lamps illuminate. If warning lamps illuminate, troubleshoot the codes. If assistance is required, call the Detroit Diesel Customer Support Center at 313–592–5800.