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Technical Information Bulletin

The Intake Throttle Valve Is Causing Regeneration Issues on Certain On-Highway Truck Engines

{1000, 1087, 7000}
Media Number -M0069062-00 Publication Date -2016/03/04 Date Updated -2016/03/07
Caterpillar: Confidential Yellow

(06605912

The Intake Throttle Valve Is Causing Regeneration Issues on Certain
On-Highway Truck Engines {1000, 1087, 7000}

SMCS - 1000; 1087; 7000

On Highway Truck
CT660S (S/N: TGA1-UP; TGD1-UP; TRK1-UP; TKL1-UP; TGR1-UP; TGS1-UP; TJS1-UP; TGT1-
UP; TGW1-UP; TSW1-UP; TSY1-UP; TGZ1-UP)

Introduction

The problem that is identified below does not have a known permanent solution. Until a permanent solution is
known, use the solution that is identified below.

Problem

Some intake throttle valves are causing frequent regeneration issues and can be hard to detect through normal test
procedures. Often there may not be any diagnostic troubleshooting codes, which may cause extended downtime for
diagnosing. Customers may experience frequent regenerations, low power, and unit unable to complete a
regeneration or soot load accumulation issues.

Possible Diagnostic Troubleshooting Codes and Dashboard Indicator Lights

The unit may have one or more or none of the following codes.

Table 1
Troubleshooting Codes/Dash Light Description
SPN 51 FMI 7/MIL ETP Does Not Agree with Commanded Position
SPN 3719 FMI 0/MIL DPF Soot Load-Highest
SPN 3719 FMI 15/MIL DPF Soot Load-Lowest
SPN 3719 FMI 16/MIL DPF Soot Load-Moderate
SPN 4766 FMI 10/MIL DPF Regen Feedback Fault

Solution

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114

1. Inspect the ITV connector for any issues like backed out pins, corrosion, or looseness.

Diagnostic Procedure

1. Form a connection with Engine Diagnostics and run an OBFCT.

1400

1000 |

Notice the DOC inlet and outlet
temps are cooler than normal.

200

Illustration 1 06043498
OBFCT with a Bad ETV

Item 1: Notice that the DOC inlet and outlet temperatures are cooler than normal regeneration should be. The DOC inlet should
be in the 288° C (550° F) to 371° (700° F) range. This is due to the ITV not working properly to produce enough heat in the
exhaust system.

Item 2: Notice the length of time it takes for the temps to start rising.

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200

— afl Naga

9 200 400 600 800 1900

Illustration 2 06043512

Good Regeneration Chart
Item 1: Notice the temperatures rise much quicker than the bad regeneration shows.

Item 2: DOC inlet temperature is in a good range.

2. Review the OBFCT and compare to the graph as shown in Illustration 1. As stated in items 1 and 2 of
Illustration 1 look for a slow to build temp and a DOC inlet temperature that stays too cold. You generally
should see DOC IT around 288° C (550° F) to 371° (700° F) as shown in Illustration 2.

3. If your OBFCT looks similar to Illustration 1 and all aftertreatment components are testing good, then
replace the ETV and retest. If it does not exhibit a similar failure, refer to the UENR5801A ftertreatment
System Diagnostics and Service Manual for further diagnostics of any regeneration concerns.

Required Parts

Table 2
Qty || Part Number Description
1 376-2757 Intake Throttle Valve (Vertical)
1 376-2618 Intake Throttle Valve (Horizontal)
1 423-8712 Gasket
1 376-2498 Bolt M8 x 50

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