Cummins ISB6.7 CM2350 (2013-17) Fault Code: 436 PID: 105 SPN: 105 FMI: 2 Intake Manifold 1 Temperature- Data Erratic, Intermittent, or Incorrect
Cummins ISB6.7 CM2350 (2013-17) Fault Code: 436 PID: 105 SPN: 105 FMI: 2 Intake Manifold 1 Temperature- Data Erratic, Intermittent, or Incorrect
Circuit Description
The Engine Control Module (ECM) provides 5 volts to the intake manifold temperature signal circuit, and monitors the change in voltage caused by changes in the resistance of the sensor to determine the intake manifold temperature. When the intake air is cold, the sensor (or thermistor) resistance is high. The ECM signal voltage only pulls down a small amount through the sensor to a ground. Therefore, the ECM senses a high signal voltage or low temperature. When the intake air is warm, the sensor resistance is low. The signal voltage pulls down a large amount. Therefore, the ECM senses a low signal voltage, or a high temperature.
Component Location
The intake manifold 1 pressure/temperature sensor is located in the air intake horn.
Conditions for Running the Diagnostics
1)This diagnostic consists of two parts. The first part runs when the keyswitch is turned ON and before engine speed is detected. The ECM must not see a key cycle for a period of 8 hours before this part of the diagnostic will run.
2)The second part runs continuously while the engine is running.
Conditions for Setting the Fault Codes
The Engine Control Module (ECM) detected the engine intake manifold temperature sensor reading was higher or lower than the other temperature sensors on the engine after an extended period of engine OFF time.
Action Taken When the Fault Code is Active
1)The ECM illuminates the amber CHECK ENGINE lamp and/or the Malfunction Indicator Lamp (MIL) immediately when the diagnostic runs and fails.
2)A default value is used for the intake manifold temperature reading.
3)Diesel exhaust fluid injection into the aftertreatment system is disabled.
4)Active and stationary regeneration of the diesel particulate filter will be disabled.
5)Exhaust Gas Recirculation (EGR) valve operation will be disabled.
6)Engine torque will be reduced if the engine is operated for an extended period of time with this fault active.
Conditions for Clearing the Fault Code
1)To validate the repair using a Diagnostic Road Test, utilize a route that incorporates both stop and go city type driving and steady state highway type driving. It may be necessary to load the unit for certain diagnostics in the ECM to run.
2)To validate the repair using a Chassis Dynamometer, utilize a routine that incorporates acceleration and motoring events, steady state highway type operation, and load. This will simulate normal driving and allow the diagnostics in the ECM to run.
3)The fault code status displayed by INSITE? electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
4)For On-Board Diagnostics (OBD) engines, the ECM will extinguish the Malfunction Indicator Lamp (MIL) after three consecutive trips where the diagnostic runs and passes.
5)The Reset All Faults command in INSITE? electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.
Possible causes:
1) In-range malfunction of the engine intake manifold temperature sensor
2) High resistance in the engine intake manifold temperature sensor signal or return lines.
If there is a Low Coolant fault active or very recently inactive, please ensure low coolant is adequately resolved and all air is out of the system before troubleshooting
