DD15 Troubleshooting – Section 91.2 SPN 1636/FMI 4

Section 91.2
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 connector. Refer to "91.2.1 Verify Repairs" .‪

Section 91.2.1
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.

   ENGINE EXHAUST ‪
   To avoid injury from inhaling engine exhaust, always operate the engine in a well-ventilated area. Engine exhaust is toxic.‪

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.