Section 87.1 SPN 1636/FMI 3

Section 87.1
SPN 1636/FMI 3

This diagnostic condition is typically Intake Air Temperature Sensor open circuit or short to power.‪

Section 87.1.1
Intake Air Temperature Sensor Open Circuit/Short to Power Check

Check as follows:‪

  1. Turn the ignition the ON (key On, engine OFF).
  2. Check for multiple codes.
    1. If codes 1636/3, 2629/3 and 412/3 are active at the same time, go to step 3 .
    2. If only fault 412/3 is active, disconnect the Intake Air Temperature Sensor and go to step 5 .
  3. Disconnect the Intake Air Temperature Sensor.
  4. Measure the voltage between pin 1 of the Intake Air Temperature Sensor and ground.
    1. If the voltage is greater than 2.75 volts, repair the short to power between pin 52 of the MCM 120–pin connector and the Intake Air Temperature Sensor, the Turbo Compressor Out Sensor and the EGR Temperature Sensor.
    2. If no voltage is present on pin 1 of the Intake Air Temperature Sensor, repair the open between pin 52 of the MCM 120–pin connector and the Intake Air Temperature Sensor, the Turbo Compressor Out Sensor and the EGR Temperature Sensor.
  5. Measure the resistance across pins 1 and 2 of the sensor (see Figure "Intake Air Temperature Sensor Wiring " ).
    1. If the resistance is greater than 4k Ω, replace the sensor.Refer to "87.1.1.1 Verify Repairs" .
      Click to see this graphic in a separate window

      Figure 1. Intake Air Temperature Sensor Wiring

    2. If the resistance is less than 4k Ω, go to step 6 .
  6. Turn the ignition switch to the ON position.
  7. Measure the voltage between pins 1 and 2 of the IAT Senor harness connector.
    1. If the voltage is between 2.75 and 3.25 volts, refer to "87.1.1.1 Verify Repairs" .
    2. If the voltage is less than 2.75 volts, go to step 8 .
  8. Measure the voltage between pin 2 of the IAT Senor harness connector and ground.
    1. If the voltage is between 2.75 and 3.25 volts, repair the open circuit between pin 1 of the IAT Senor harness connector and pin 52 of the MCM 120–pin connector. Refer to "87.1.1.1 Verify Repairs" .
    2. If the voltage is less than 2.75 volts, repair the open circuit between pin 2 of the IAT Senor harness connector and pin 106 of the MCM 120–pin connector. Refer to "87.1.1.1 Verify Repairs" .
Section 87.1.1.1
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.


EPA07 Series 60 DDEC VI Troubleshooting Guide - 6SE567
Generated on 10-13-2008

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