Model 4700 Maintenance Manual

Section 6.Messages and Codes

Fault Codes

Refer to the “Pinout Matrix” located in Theory of Operation section for all voltage and resistance values and component interconnection.

Code Description

28 Code 28: Steer Sensor Out-of-Range

The input voltage from the steer pot is outside the required values.

Notes/Corrective Action

Check wires to the pot for opens or shorts. Check pot supply and output voltage. Check pot mounting and connection. Check for shorts to frame. Adjust pot to approx. 5.5V with wheels straight. Run default Learn.

29 Code 29: Requesting Travel In Both Directions

Forward and Reverse switches are closed at the same time.

2A Code 2A: Master TPA Internal Fault

Master TPA has an incorrect configuration.

2C Code 2C: Master TPA Parameter Restore Error

Internal failure of the Master TPA.

2E Code 2E: Parking Brake Switch Error

SW7 is closed when travel is detected.

31 Code 31: PPA Internal Fault

The power amplifier has detected an internal fault.

32 Code 32: PPA Internal Fault

Fault in the area of memory where the adjustable parameters are stored.

33 Code 33: PPA Internal Fault Internal Failure of the PPA.

Troubleshoot switches and wiring. If OK, replace the TPA.

Verify connections to TPA. Replace the TPA.

Verify connections to TPA. Replace the TPA.

Troubleshoot switch and wiring.

Check voltage to the PPA. Check communication wires between PPA, TPA, and VM for continuity and shorts to frame. If OK, replace the PPA.

If code does not clear by cycling Key switch, replace the PPA. If code clears, the adjustable parameters have been reset to default values and require resetting to customer’s requirements via FlashWare.

Check voltage to the PPA. If OK, replace the PPA.

Publication 1160093, Issued: 20 May 2013 6-13