The ECM detects the following conditions:
•The vehicle speed signal indicates that the vehicle speed is 0 MPH.
•Desired engine speed is greater than the programmed “VSL Protection”.
•The “VSL Protection” parameter is programmed to a value that is less than 2120 rpm.
Probable Causes:
1) Fuel system restriction (Uncommon, but possible)
2) If speedometer is not accurate, then ECM is not programmed correctly
3) Vehicle speed sensor
4) Vehicle speed sensor wiring
5) ECM Connection/Harness
6) Speedometer failure
7) ECM Failure
CAT 3406E (Prefix 1MM or 2WS) Fault Code: 31 PID: SPN: 84 FMI: 1 Vehicle Speed loss of signal
CAT 3406E (Prefix 1MM or 2WS) Fault Code: 29 PID: SPN: 30 FMI: 13 PTO Throttle out of calibration
CAT 3406E (Prefix 1MM or 2WS) Fault Code: 29 PID: SPN: 30 FMI: 8 PTO Throttle signal invalid
CAT 3406E (Prefix 1MM or 2WS) Fault Code: 28 PID: SPN: 91 FMI: 13 Throttle Sensor out of calibration
CAT 3406E (Prefix 1MM or 2WS) Fault Code: 27 PID: SPN: 110 FMI: 4 Coolant Temperature voltage low
CAT 3406E (Prefix 1MM or 2WS) Fault Code: 27 PID: SPN: 110 FMI: 3 Coolant Temperature voltage high
