NHTSA ID Number: 10131155
Manufacturer Communication Number: IK0900087
TSB/Document Date: 2018-04-02
Summary
Low Temperature Radiator Diagnostics
IK0900087 - Low Temperature Radiator Diagnostics
Page 1 of 4
Countries:
CANADA, UNITED STATES Document ID: IK0900087
Availability :
ISIS, FleetISIS
Revision:
0
Major System:
COOLING
Created:
9/19/2013
Current Language: English
Last Modified: 10/17/2013
Other Languages: NONE
Author:
Viewed:
Steven Bell
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Title: Low Temperature Radiator Diagnostics
Applies To: Big Bore, ProStar, TranStar, WorkStar, LoneStar
DESCRIPTION
Any complaint for engine de-rate (loss of power) or engine shutdown when hot, loaded, or pulling hills will require the
CCV (Coolant Control Valve) and LTR (Low Temperature Radiator) to be inspected. This issue can also be very difficult
to duplicate without a loaded trailer or hills to pull.
The CCV consists of the CMV (Coolant Mixer Valve) and CFV (Coolant Flow Valve) and is located on the front of the
engine, upper right side.
SYMPTOMS
Engine De-Rate
Engine Overheat
Warning Lamps in Cluster
Fan Engages before the Programmed Temperature (Fan On Temp)
POSSIBLE DIAGNOSTIC TROUBLE CODES
SPN
1173
FMI DESCRIPTION
16 TC2CIT Signal Above Desired (Interstage CAC Under Cooling)
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IK0900087 - Low Temperature Radiator Diagnostics
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Page 2 of 4
EGRP Fault: Over Temperature
TROUBLESHOOTING
1. Bring the engine to operating temperature. Drive at highway speeds at operating temperature then cruise at 1500
rpm using cruise control and check the ECT1 and ECT2 temperatures. They should be separated by about 20°F to
40°F when the CCV starts directing coolant flow into the LTR. This may take a few minutes, it will not be an instant
change, but will be a gradual separation of the temperatures. Be sure to capture this in a performance snapshot in
case you need it later.
2. Run the CCV tests in ServiceMaxx with the engine at operating temperature. Look for a separation in the ECT1
and ECT2 temperatures. The valve will need to be actuated several times before you will start to see the
difference in temps. If the valve is not working then check the connectors and terminals, ensuring they are fully
seated in their connector and have not spread causing poor terminal tension. Perform the harness resistance test
the circuits to check for any opens. Load test the wiring using a headlamp to make sure it is capable of handling a
load.
3. Check the cooling system package for external plugging. Especially check for debris packed between the cooling
system components. (Bug screen, a/c condenser, CAC, LTR and radiator)
4. Remove the LTR coolant inlet and outlet. Use a garden hose at the inlet and check the outlet for flow. Be sure to
block off the aeration port on the LTR. If the flow is the same as the inlet then the radiator is not internally
plugged. If the flow is less than the inlet then the LTR is plugged internally and needs to be replaced. If replacing
the LTR be sure to also order p/n 2608109C91 (Phosphate Conditioner).
5. If the LTR is good and the CCV electrical circuits are checking good then replace the CCV and retest for any
issues.
The below videos are examples only and not a determination of the flow spec for the LTR.
Below is an example of a plugged LTR flow
Below is an example of a new LTR Flow
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IK0900087 - Low Temperature Radiator Diagnostics
Page 3 of 4
SIGNALS TO WATCH
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IK0900087 - Low Temperature Radiator Diagnostics
Page 4 of 4
ADDITIONAL RESOURCES
Coolant Flow Valve Troubleshooting
Coolant Mixer Valve Troubleshooting
0000001741 - MaxxForce 11 and 13 Engine Diagnostic Manual (EPA 10) 2013 HD-OBD
0000002161 - 2013 N13 Engine Diagnostic Manual with SCR HD-OBD (EPA 10)
Master Service Information Page
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Copyright © 2013 Navistar
, Inc.
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TSB/Document ID: IK0900087
Replacement Service Bulletin Number:
MFR Communication Date: 2013-10-17
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE AND ENGINE COOLING
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
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