RACE 9S4085 - Caterpillar

On Highway Truck: CT660 (S/N: TGA1-UP; JFB1-UP; TJD1-UP; TEJ1-UP; TRK1-UP; TKL1-UP; TEM1-UP; TEP1-UP; TGR1-UP; TJS1-UP; TGS1-UP; TGT1-UP; TGW1-UP; TGD1-UP; TSW1-UP; TEY1-UP; TSY1-UP; TEZ1-UP; TGZ1-UP) CT680 (S/N: TWT1-UP; TKW1-UP; TRX1-UP; TRZ1-UP) CT681 (S/N: TWJ1-UP)Introduction
This Special Instruction outlines the diagnostic procedure for Fault code SPN 5542 FMI 15 (Low-pressure turbo outlet pressure too high/TC1TOP above desired). Do not proceed to any diagnostic procedure with out first completely reading and understanding the outlines inside this Special Instruction.Symptoms
Table 1
Symptoms    
DTC/Light     Description    
SPN 5542 FMI 15     TC1TOP above desired    
Malfunction Indicator Light (MIL) Possible Causes:
Restricted exhaust
Stuck or sticking closed EBPV
Failed ACVSpecial Tools
Table 2
Special Tools    
Tool Description     Tool Number    
Personal Computer (PC) with Engine Diagnostic Software     N/A    
J1939 and J1708 RP1210B-Compliant Communication Device     N/A    Diagnostic Procedure
Table 3
Step     Action     Decision    
1     Check to see if the following faults are present in Electronic Control Module (ECM) (In addition to SPN 5542 FMI 15) :
Using PC with engine diagnostic software, check fault codes.
Look for SPN 5541,4452 (except FMI 15), and 5543.
Are there any faults present?     Yes: Diagnose these faults before SPN 5542 FMI 15    
No: Go to Step 2, Table 4
Table 4
Step     Action     Decision    
2     Check for SPN 3719 Diesel Particulate Filter (DPF) soot load fault codes present in ECM:
Using PC with engine diagnostic software, check fault codes.
Look for SPN 3719 FMI 0 or 16 (1)
Is SPN 3719 present?     Yes: Go to Symptom 2 of Troubleshooting, UENR5801, "CT11 and CT13 Non-SCR Aftertreatment System Diagnostics and Service Manual"    
No: Go to Step 3, Table 5
( 1 ) Excessive back pressure in the exhaust system, such as a plugged Diesel