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Title: Electric Vehicle Air Compressor Over Voltage Conditions

Applies To:IC Bus® Electric CE Series & International® eMV™ Series

CHANGE LOG

Please refer to the change log text box below for recent changes to this article:

71012023 - Initial Aficle Release

Countries:
Availability:
Major System:

ISIS, Bus ISIS, NotSIR
ELECTRIC VEHICLE
Currant Language: English

Other Languages: NONE

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DESCRIPTION

This document will guide the user through detecting an abnormal overvoltage condition of the high-voltage air compressor.

CANADA, UNITED STATES Document ID: 12300028

Revision: 0
Created: aigi2024
Last Modified: 4/10/2024

Author: Josh Bowman

Not Helpful

It has been found, there is an internal hardware concern with the printed circuit board (PCB) for the 2-1 Inverter causing a false overvoltage condition when

heat is applied

SYMPTOMS

Diagnostic Trouble Codes & Dashboard Indicator Lights:

DTC/Light

[Description

SPN 1351 FMI 3.

Air Compressor Status: Voltage Above

INormal, or Shorted to High Source

Customer Observations or Concerns:
Air compressor stops functioning (can be intermittent)

SPECIAL TOOLS / SOFTWARE

lTool Description

|Tool Number

Comments.

EZ-Tech

NIA

Any supported EZ-Tech

Service Diagnostics Solutions (SDS)

Version 1.6.18 or higher

NEXIQ USB-Link 2 or 3

NQ124032 or NQ121052

Electric Vehicle "Y" Adapater Cable

08-801-01

Works with USB-LINK 2 or 3

SERVICE PARTS INFORMATION

Kit Description

Part Number

Quantity

Requirea |Notes

MODULE , 2-IN-1 INVERTER

4209536C6

1

DIAGNOSTIC STEPS

To prevent property damage, personal injury, and / or death, park vehicle on a hard, flat
Isurface, turn the engine off, set the parking brake, and install wheel chocks to prevent the
vehicle from moving in either direction.

To prevent property damage, personal injury, and / or death, if the vehicle must be raised,
ldo not work under the vehicle supported only by jacks, Jacks can slip or fall over.

To prevent personal injury and / or death, always wear safe eye protection when
performing vehicle maintenance.

To prevent property damage, personal injury, and / or death, keep flames or sparks away
from vehicle and do not smoke while servicing the vehicle’s batteries. Batteries expel
lexplosive gases.

[To prevent property damage, personal injury, and / or death, remove the ground cable from the
negative terminal of the battery box before disconnecting any electrical components. Always
connect the ground cable last.

To prevent personal injury or death, NEVER service a high-voltage vehicle without
completing high-voltage safety training. Before working on vehicle, read and obey all
High-Voltage Safety and Lock-Out Tag-Out procedures and information.

{To prevent personal injury or death, wear and use approved high-voltage Personal Protective
Equipment (PPE) when near a high-voltage electric vehicle. Inspect PPE before use. Do not use
Igloves or other PPE with expired dates, holes, cracks or damage. NEVER touch energized orange
high-voltage cables or high-voltage components without wearing approved high-voltage PPE.

To prevent personal injury or death, read all information in the Safety Information and
High-Voltage Safety sections of the service manual.

|Step/Action De

n

1 |DIAGNOSTIC: \Yes. Proceed to step 2

Did the vehicle experience the high-voltage compressor shutting down?

INo. No further action needed

Step

Action

Der

n

DIAGNOSTIC:

Perform an SDS EV CAN Logging Session (/K4300025), Open a technical service
case file and attach recording with all corresponding information such as fault codes
land additional symptoms.

M. If air compressor voltage (EABC) is
Hound abnormal (high), the 2-1 inverter will
Ineed to be flashed with an updated
software from a Navistar field
representative.

If a representative is unable to be present
within a reasonable time, the 2-1 Inverter
Iwill need to be replaced with the C6
version that contains the updated
software.

2. If compressor voltage is found normal,
ladditional diagnostics will need to be
performed