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
Notes/Corrective Action
15
Code 15: Amplifier Enable No B– input seen by the TPA.
Check for B– at the TPA power input. If OK, replace 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.
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.
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.
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.
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.
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.
19
Code 19: Traction Contactor Driver Shorted The TPA did not see a voltage drop when the CT3 contactor was commanded closed.
Check the CT3 contactor for physical binding and welded tips. Measure voltage and resistance across coil. If OK, replace the TPA.
1A
Code 1A: Slave TPA Not Responding No or low current is seen by the Slave TPA's internal current sensor during operation.
Verify connections to TPA. Replace the TPA.
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.
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.
Publication 1160093, Issued: 20 May 2013
6-11
