Section 6. Messages and Codes
Model 4700 Maintenance Manual
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
34
Code 34: PPA Internal Fault Correct current draw by the motor is not seen by the PPA.
Check battery voltage and specific gravity - static and under load. Refer to battery manufacturer for correct voltage and specific gravity information. Check for shorts to frame. Check voltage to the PPA. Check cables to the motor for continuity and correct torque. Compare current from all 3 phases. If one phase is significantly higher or lower than the other two, replace the motor. If OK, replace the PPA.
35
Code 35: Battery Sense Out-of-Range The PPA monitors the battery voltage at B+Key. If voltage does not match configured voltage or is below set threshold, this code is displayed. The PPA also monitors the voltage on its internal capacitors. If voltage goes above 63VDC, this code is displayed.
Verify battery voltage. If wrong voltage, set correct voltage via FlashWare (and re-learn pots) or install correct voltage battery. Test the power cables to the motor for shorts to the truck frame and/or other cables. Test the motor for shorts to frame. Resistance must be >1 Meg ohm. If OK, replace the PPA.
36
Code 36: Short in PPA When the Key switch is turned ON, the PPA momentarily powers each motor phase and monitors current. If no current is seen, this code is displayed.
Check battery voltage and specific gravity - static and under load. Refer to battery manufacturer for correct voltage and specific gravity information. Check for shorts to frame. Measure voltage and resistance across CT2 coil. Check cables to the motor and PPA for continuity and correct torque. Swap the connections from the PPA and pump motor with the TPA and traction motor using appropriately sized jumper cables and turn the Key switch ON. If code changes, replace the motor. If the code is still displayed, replace the PPA.
37
Code 37: Open in PPA When the Key switch is turned ON, the PPA monitors each motor phase for current draw. If current is seen when it should not be, this code is displayed.
Check voltage to the PPA. Check cables to the motor and PPA for continuity and correct torque. Swap the connections from the PPA and pump motor with the TPA and traction motor using appropriately sized jumper cables and turn the Key switch ON. If code changes, replace the motor. If the code is still displayed, replace the PPA.
38
Code 38: Pump Contactor Open When Commanded Closed Correct voltage is not seen by the PPA at +V when CT2 is commanded closed.
Inspect the contactor for physical binding and welded tips. Check fuse for the PPA (FP). Measure voltage and resistance across coil. Check cables from battery to PPA for continuity and correct torque. If OK, replace the PPA.
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Publication 1160093, Issued: 20 May 2013
