SPN 3509/FMI 4
This diagnosis typically means the 5 V sensor supply bank 1 circuit failed low.
This fault indicates that the MCM detects a short to ground (voltage < 4.7) on either of the MCM pins listed in Table “MCM Pins for Short to Ground Check” .
| Component | MCM Pin |
| Charge Air Cooler Outlet Pressure Sensor | 58 |
| Inlet Air Delta P, Intake Throttle Valve | 117 |
Table 1. MCM Pins for Short to Ground Check
Inspect the harness and repair as necessary. Refer to “110.2.1 Verify Repairs” .
Verify Repairs
Verify repairs as follows:
- Turn ignition OFF.
- Reconnect any electrical connections that were disconnected to perform the diagnosis.
- Clear codes with DDDL 7.0 or latest version.
- Start and bring engine up to operating temperature (over 140°F/60°C).
- Verify operation is satisfactory and no warning lamps illuminate. If warning lamps illuminate, troubleshoot the codes.
