NHTSA ID Number: 10198715
Manufacturer Communication Number: IK1201429
TSB/Document Date: 2021-07-02
Summary
CPA BEAM RCT and Idle Test for A26 engine; only trucks equipped with International
A26 engine
IK1201429 - CPA BEAM RCT and Idle Test for A26 engine
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Countries:
CANADA, UNITED STATES Document ID: IK1201429
Availability:
ISIS, IsSIR
Revision:
4
Major System:
ENGINES
Created:
1/2/2019
Current Language: English
Last Modified: 6/3/2021
Other Languages: NONE
Author:
Viewed:
Mark Ehlers
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Title : CPA BEAM RCT and Idle Test for A26 engine
Applies To : A26 engine
CHANGE LOG
Please refer to the change log text box below for recent changes to this article:
04/29/2021 - Udpates to support misfire diagnostics
03/11/2019 - Improved breakout harness ID
01/03/2019 - Initial Article Release
DESCRIPTION:
This document describes the process for utilizing the Cylinder Performance Analyzer Base Engine Analysis Module (CPA BEAM) tests for the A26
engine
CPA BEAM Tests Apply To:
Engine Platform
Emission Year
Engine Model
Big Bore
2017-2021
A26
Note: Software must always be current. Refer to the CPA Resource Article
SYMPTOMS:
For proper diagnostics follow the appropriate engine diagnostic manual for step by step instructions
Symptom
High Blow-By
Low Compression
Hard Start
Engine noise or knock
Suspected bent rod
Oil Carry-Over at Road Draft
Low Power
Oil Consumption
Misfire & misfire faults
Engine runs rough
SPECIAL TOOL(s) / SOFTWARE:
• Tools required for component removal: Refer to the appropriate engine service manual
• To perform CPA BEAM Tests properly, the following tools are required:
Tool Description
Quantity Tool Number
Comments
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IK1201429 - CPA BEAM RCT and Idle Test for A26 engine
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EZ-Tech
1
Navistar Engine Diagnostics and CPA software must be installed
RP1210 Communication
Device
1
CPA Module
1
OE-11178 / 12-999-01-01
CPA extension harnesses
3
12–999–01–05
CPA to Banana jack leads
3
12-999-01-06
180 Pin breakout box
1
00-00956-08
E1 ECM breakout harness
1
12-801-05-03
and overlay -04
Tools Resource Center
CPA BEAM DESCRIPTION:
CPA BEAM is a family of tests that accurately measures base engine performance
BEAM Test
Description
Idle Test (misfire)
Measures each cylinder contributions at
steady RPM.
Idle speed to 1200 RPM.
Engine
Platform
Notes
Application
A26
Do not use cruise switches to hold engine
RPM, use the throttle pedal. Hold at RPM that
the engine runs the worst.
Repeat test several times & compare results
Relative Compression Test (RCT)
Note- It is not practical to perform RCT+ on
Measures compression per cylinder
an A26 UNLESS it has a 2 cylinder
compressor
(RCT+ uses the Pressure+ Module)
A26
Perform with engine warm (if possible)
Equipment Condition
1. Verify engine coolant temperature is > 150°F (65°C). If engine does not start the RCT test may still be performed.
2. Verify battery voltage is > 12.5 volts.
NOTE : Disconnect battery charger before beginning tests.
CPA Module Connections
1. Connect CPA module 12–999–01–01 to Electronic Service Tool (EST).
2. Connect E1 Breakout harness 12-801-05-03 between ECM and engine harness. Use Overlay 12-801-05-04
3. Connect CPA extension harness 12–999–01–05 and CPA to Banana Jack leads (12-999-01-06 or 12-999-01-08) to Channel 1 of CPA tool. Connect
the RED lead to pin E1-21 and the black lead to pin E1-45 on the Breakout box.
4. Connect CPA extension harness 12–999–01–05 and CPA to Banana Jack leads (12-999-01-06 or 12-999-01-08) to Channel 4 of CPA tool. Connect
the RED lead to pin E1-19 and the black lead to pin E1-43 on the Breakout Box
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IK1201429 - CPA BEAM RCT and Idle Test for A26 engine
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• It is recommended to perform the BEAM Idle Test first and then the RCT test.
• Launch CPA from NEDs as shown below:
• Select Idle Test as shown below & Start Test
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IK1201429 - CPA BEAM RCT and Idle Test for A26 engine
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• The screen below will pop-up to confirm that you have the cables connected properly to the CPA box
◦ For A26 Idle Test and RCT we DO NOT use the PressurePlus Module
• Follow the onscreen instructions for the Idle Test.
• Use the throttle pedal (not the cruise switches) to hold the engine RPM stable at the RPM which the engine runs the worst.
◦ BEAM Idle Test can analyze any stable RPM between idle and 1200 RPM
◦ The engine can be loaded during the Idle Test with fan or power steering or driving (in a parking lot)
◦ Repeat the Idle Test several times to increase accuracy of weak cylinder identification. Change the RPM of the test if needed to help ID a
weak cylinder.
• When the test ends disregard the Summary screen (A26 Summary statements are still being calibrated). Select "Show Results" and study the
graphs.
◦ See below:
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IK1201429 - CPA BEAM RCT and Idle Test for A26 engine
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• Example of Idle Test Results below:
• The BEAM RCT test uses the exact same connections as the IDLE Test.
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IK1201429 - CPA BEAM RCT and Idle Test for A26 engine
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Unplug the ECM injector connection (prevents engine start) and follow the on-screen instructions.
Do not have a battery charger connected to the truck
Perform with engine warm if possible
Clear faults after removing the breakout box from the ECM
• Example of RCT test Results below:
WARRANTY INFORMATION
Description
SRT Link
12 - CYLINDER PERFORMANCE ANALYZER (CPA) TOOL, DIAGNOSIS
CPA Diagnostics
Warranty Claim Coding:
Refer to the Warranty Coding Manual for Group and Noun Codes.
Standard Repair Time(s):
Refer to the SRT Manual for Repair Times
OTHER RESOURCES
Master Service Information Site
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Copyright © 2021 Navistar, Inc.
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TSB/Document ID: IK1201429
Replacement Service Bulletin Number:
MFR Communication Date: 2021-06-03
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE AND ENGINE COOLING
MFR Component System:
MFR Component Subsystem:
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