Model 4700 Maintenance Manual

Code Description

15 Code 15: Amplifier Enable No B– input seen by the TPA.

16 Code 16: Master TPA Detected CAN-Bus Error

The Master TPA has not received a communication message from the VM, HCB, or PPA.

17 Code 17: CAN-Bus Node Offline

Too much time between communication from the VM and PPA to the TPA has elapsed. This code can also be caused by an open in a cable from the amplifier to the traction motors.

18 Code 18: Relay 1 Not Energized By TPA

The TPA commanded Relay 1 to energize with truck configured for a 48V battery. Did not receive correct feedback.

19 Code 19: Traction Contactor Driver Shorted

The TPA did not see a voltage drop when the CT3 contactor was commanded closed.

1A Code 1A: Slave TPA Not Responding

No or low current is seen by the Slave TPA's internal current sensor during operation.

1C Code 1C: Battery Low

The voltage at the B+ Key input to the TPA is down to 10% of charge level (performance reduction). Current will be reduced to 50% of programmed levels.

Publication 1160093, Issued: 20 May 2013

Section 6.Messages and Codes

Fault Codes

Notes/Corrective Action

Check for B– at the TPA power input. If OK, replace the TPA.

Test battery voltage under load. Check for shorts to frame. Check voltage to TPA and PPA. Check communication wires between all modules for continuity and shorts to frame. Check both traction motor encoders. If OK, replace the TPA.

Check power to TPA, PPA, and VM. Check cables to the motor(s) and TPA for continuity and correct torque. Check both traction motor encoders, temperature sensors, and connections. Check communication wires between VM, TPA, and PPA for continuity and shorts to frame. If OK, replace the TPA.

Check Relay 1 by disconnecting from circuit. Check output to Relay 1 from TPA. If OK, replace Relay 1. If not OK, replace the TPA.

Check the CT3 contactor for physical binding and welded tips. Measure voltage and resistance across coil. If OK, replace the TPA.

Verify connections to TPA. Replace the TPA.

Check battery voltage and specific gravity - static and under load. Refer to battery manufacturer for correct voltage and specific gravity information. If OK, replace the TPA.

Section 6.Messages and Codes

Fault Codes

Model 4700 Maintenance Manual

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

Code Description

1E Code 1E: Traction Contactor Closed When Commanded Open

The TPA commanded the CT3 contactor open and the tips are still closed.

20 Code 20: Traction Contactor Coil

Driver Error

Failure of the contactor driver.

21 Code 21: Traction Contactor Coil

Shorted

The TPA did not see a voltage drop when the contactor was commanded closed.

Notes/Corrective Action

Check the contactor for physical binding and welded tips. Measure voltage and resistance across coil. Check motors for shorts from windings to case. If OK, replace the TPA.

Measure voltage and resistance across coil. If OK, replace the TPA.

Check the contactor for physical binding and welded tips. Measure voltage and resistance across coil. If OK, replace the TPA.

22 Code 22: Steer Pot Fault Learn steer pot.

23 Code 23: Seat Switch Open

The seat switch or an optional battery gate switch opened during operation.

25 Code 25: Incorrect Battery Installed

When the Key switch is turned ON, the TPA checks the battery voltage and compares it with the "SET BATTERY" parameter setting. If the actual voltage is 20% higher or lower than the set value, this code is displayed.

26 Code 26: Incorrect Start Procedure

General incorrect starting procedure. May appear in conjunction with Code81.

Troubleshoot seat switch, optional battery gate switches, and associated wiring. If OK, replace the TPA.

Verify battery voltage. If wrong voltage, set correct voltage via FlashWare (and re-learn pots) or install correct voltage battery.

If battery and parameter setting is OK, replace the TPA.

6-12

If the directional switch is left in forward or reverse position when the operator leaves the seat, Code 81 is displayed after a brief time-out (approx. 30 sec). If the code still appears after lever is returned to neutral, cycle the Key switch to clear. Test switches for correct operation. Check continuity of wires from switches to cards.

Publication 1160093, Issued: 20 May 2013