Cummins ISX11.9 code 153 is the Cummins troubleshooting document for the Intake Manifold 1 Temperature Sensor Circuit – Voltage Above Normal or Shorted to High Source fault (PID P105, SPN 105, FMI 3/3). The intake manifold 1 temperature sensor is a variable-resistor (thermistor) sensor that measures the temperature of air entering the intake manifold, and the ECM uses this value for engine protection and emissions control. It sets an amber warning lamp and lists the exact conditions, causes, and step-by-step checks a technician follows.
Official document details
| Brand | Cummins |
|---|---|
| Model coverage | ISX11.9 CM2250, ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, and ISX15 CM2250 |
| System / Group | ISX11.9 CM2250 (2010-12) / DTCs |
| Fault identifiers | PID P105, SPN 105, FMI 3/3 |
| Warning lamp | Amber |
| Pages | 19 |
| Format | |
| Language | English |
Document table of contents
- Overview and circuit description
- Component location
- Conditions for running the diagnostics
- Conditions for setting the fault code
- Action taken when the fault code is active
- Conditions for clearing the fault code
- Shop Talk and possible causes
- Associated procedures and troubleshooting steps
Trucks covered by Cummins ISX11.9 code 153
This procedure applies to ISX11.9 CM2250, ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, and ISX15 CM2250. This is an official Cummins fault-code troubleshooting procedure, cleared and verified with the Cummins INSITE electronic service tool. It is set by an intake manifold temperature signal voltage above 4.95 VDC for more than 10 seconds, and typical effects include possible white smoke, the cooling fan staying on when ECM-controlled, and loss of engine protection for intake manifold air temperature. For engine specifications and dealer support, see the official Cummins website.
Who needs this Cummins ISX11.9 code 153 manual
Heavy-truck technicians, fleet maintenance teams, and workshop owners diagnosing this fault use it to confirm the code before replacing parts. During diagnosis the sensor shares return wires with other sensors, its resistance reads 1.6k to 3.1k ohms, and repairs are verified with the Cummins INSITE electronic service tool. The diagnostic runs continuously with the keyswitch in the ON position, and the repair is validated by returning the code to inactive status.
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