Cummins fault code 4734
Auxiliary Input/Output 1: special instructions
What it means
Cummins' description: Auxiliary Input/Output 1 - Special Instructions.
SPN 701 is Auxiliary I/O #01. FMI 14 means the fault requires specific troubleshooting steps from Cummins service information.
These codes cover extra inputs and outputs the ECM controls or monitors: auxiliary temperature and pressure sensors, relays, lamps, and generator or equipment controls on off-highway and generator engines.
What the lamp means
A red stop lamp means Cummins treats this as serious. Stop the engine as soon as you can do it safely and get it checked before running it again.
Green, yellow, red: three ways this can look
The same code can be a quick fix or a reason to shut down. Match your situation to the closest example. Cummins rates this a red stop lamp code, so if the red lamp is on, go by the red example.
Keep an eye on it
An auxiliary code for an accessory that isn't used on your truck.
Schedule a repair
An accessory, gauge or lamp not working with the code set. Fix the circuit when convenient.
Stop and get help
The code is tied to a shutdown or protection relay. Have it checked before relying on that protection.
Common causes
The sensor reading itself is out of range or the condition is real, so look at the system:
- Real reading from the equipment the input is monitoring
What you can check before calling
- Find out what the auxiliary input is wired to on your truck or equipment
- Check connectors and relays in that circuit
Clearing the code without fixing the cause usually brings it right back, and on emissions systems it can restart derate timers.
Engines and sources
Listed by Cummins for: QSB 6.7, QSL 9, QSX 15, QSB 4.5, QSF 3.8, QSG 12. Cummins uses the same fault code numbers across its electronic engines, including on-highway models like the ISB/B6.7, ISL/L9 and ISX/X15, though not every code applies to every engine or software level. Source: Cummins Tier 4 Fault Codes. Always confirm with Cummins service information (QuickServe) for your engine serial number.
Related Auxiliary inputs, outputs and generator controls codes
- 4725 SPN 702 FMI 6
Auxiliary Input/Output 2 Circuit: circuit grounded / current high - 4724 SPN 702 FMI 5
Auxiliary Input/Output 2 Circuit: circuit open / current low - 3766 SPN 442 FMI 4
Auxiliary Temperature Sensor Input 2 Circuit: circuit voltage low / shorted low - 3765 SPN 442 FMI 3
Auxiliary Temperature Sensor Input 2 Circuit: circuit voltage high / shorted high - 3696 SPN 4183 FMI 4
Droop Adjust Potentiometer Circuit: circuit voltage low / shorted low - 3695 SPN 4182 FMI 4
Generator Output Frequency Adjust Potentiometer Circuit: circuit voltage low / shorted low
Look up another code
Cummins fault code (like 1922), J1939 SPN and FMI (like SPN 3251 FMI 0), or an OBD-II code (like P0420).
Questions
What does Cummins fault code 4734 mean?
Cummins fault code 4734 is J1939 SPN 701 FMI 14: Auxiliary Input/Output 1 - Special Instructions. In plain terms: auxiliary input/output 1: special instructions.
Can I keep driving with Cummins code 4734?
No. Cummins assigns this code a red stop lamp. Stop the engine as soon as it's safe and have it checked before running it again. Look at the green, yellow and red examples on this page to judge your situation.
What is the SPN and FMI for Cummins code 4734?
SPN 701 identifies the part or system (Auxiliary I/O #01). FMI 14 describes the type of failure: special instructions.
What usually causes Cummins code 4734?
The most common causes are: real reading from the equipment the input is monitoring.
Diesel down in the Midlands?
We work on Cummins-powered pickups, vans and medium-duty trucks across Lexington, Columbia and the Midlands, on site at your yard or roadside.