NUMBER: 08 DDEC VI 16 S.M. REF.: listed in Table 1 ENGINE: DD15 DATE: April 2008 SUBJECT: SPN 1636 AND SPN 2630 PUBLICATION: DDC-SVC-MAN-0029

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1 NUMBER: 08 DDEC VI 16 S.M. REF.: listed in Table 1 ENGINE: DD15 DATE: April 2008 SUBJECT: SPN 1636 AND SPN 2630 PUBLICATION: DDC-SVC-MAN-0029 The procedure and direction for SPN 1636 have changed. SPN 1636 indicates a problem with the intake manifold temperature circuit. SPN 2630 has been added. This code indicates a problem with the intake air temperature circuit. Section SPN 1636, refer to section 90 SPN 2630, refer to section 94 Table 1 Manual Changes and Additions Changes/Additions SPN 1636/FMI 3, intake manifold temperature circuit failed high SPN 1636/FMI 4, intake manifold temperature circuit failed low SPN 2630/FMI 3, intake air temperature circuit failed high SPN 2630/FMI 4, intake air temperature circuit failed low

2 SPN 1636 This SPN indicates the intake manifold temperature is outside of normal operating range. SPN 1636/FMI 3 This diagnostic condition is typically intake manifold temperature circuit failed high. Check as follows: 1. Check for multiple codes. [a] If 1636/3 and 2630/3 are present, go to step 6. [b] If only 1636/3 is present, go to the next step. 2. Disconnect the Intake Manifold Temperature Sensor. 3. Turn the ignition ON (key On, engine OFF). 4. Measure the voltage between pins 1 and 2 of the Intake Manifold Temperature Sensor harness [a] If the voltage is between 2.8 and 3 volts, replace the Intake Manifold Temperature Sensor. [b] If the voltage is less than 2.8 volts, go to the next step.

3 5. Measure the voltage between pin 2 of the Intake Manifold Temperature Sensor and ground. [a] If the voltage is between 2.8 and 3 volts, repair the wire between pin 1 of the Intake Manifold Temperature Sensor connector and pin 52 of the MCM 120 pin [b] If the voltage is less than 2.8 volts, repair the wire between pin 2 of the Intake Manifold Temperature Sensor connector and pin 106 of the MCM 120 pin 6. Measure the voltage between pins 1 and 2 of the Intake Manifold Temperature Sensor harness [a] If the voltage is greater than 3 volts, repair the short to power on either pin 106 or 119 of the MCM 120 pin [b] If no voltage is present, repair the open between pin 52 of the MCM 120 pin connector and the Intake Manifold Temperature Sensor and the Intake Air Temperature Sensor. SPN 1636/FMI 4 This diagnostic condition is typically intake manifold temperature circuit failed low. Repair the short to ground between pin 2 of the Intake Manifold Temperature Sensor harness connector and pin 106 of the MCM 120 pin

4 SPN 2630 This SPN indicates the intake air temperature is outside of normal operating range. SPN 2630/FMI 3 This diagnostic condition is typically intake air temperature circuit failed high. Check as follows: 1. Check for multiple codes. [a] If codes 1636/3 and 2630/3 are active at the same time, go to step 6. [b] If only fault 2630/3 is active, go to the next step. 2. Disconnect the Intake Air Temperature Sensor. 3. Turn the ignition ON (key On, engine OFF). 4. Measure the voltage between pins 1 and 2 of the Intake Air Temperature Sensor harness [a] If the voltage is between 2.8 and 3 volts, replace the Intake Air Temperature Sensor. [b] If the voltage is less than 2.8 volts, go to the next step.

5 5. Measure the voltage between pin 2 of the Intake Air Temperature Sensor harness and ground. [a] If the voltage is between 2.8 and 3 volts, repair the wire between pin 1 of the Intake Air Temperature Sensor connector and pin 52 of the MCM 120 pin [b] If the voltage is less than 2.8 volts, repair the wire between pin 2 of the Intake Air Temperature Sensor connector and pin 119 of the MCM 120 pin 6. Measure the voltage between pins 1 and 2 of the Intake Air Temperature Sensor harness [a] If voltage is greater than 3 volts, repair the short to power on either pin 106 or 119 of the MCM 120 pin [b] If the no voltage is present, repair the open between pin 52 of the MCM 120 pin connector and the Intake Air Temperature Sensor and Intake Manifold Temperature Sensor. Verify repairs. SPN 2630/FMI 4 This diagnostic condition is typically intake air temperature circuit failed low. Repair the short to ground between pin 2 of the Intake Air Temperature Sensor harness connector and pin 119 of the MCM 120 pin Verify Repairs.

6 ADDITIONAL SERVICE INFORMATION Additional service information is available in one of the DDEC VI troubleshooting guides. Detroit Diesel, DDC, Series 60 and the spinning arrows design are registered trademarks of Detroit Diesel Corporation. Copyright 2008 Detroit Diesel Corporation. All rights reserved. Printed in U.S.A.