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128 Psid 94

This document provides information about a fault code detected by a Volvo engine control unit related to low fuel feed pressure. It describes the fault mode, detection conditions, symptoms, and possible causes for the fault. The faults include fuel pressure below static and engine speed dependent minimum values as well as voltage levels outside the normal range. Suggested causes are issues like a clogged fuel filter or defective fuel pump that could result in low fuel pressure. The document aims to help technicians diagnose and resolve the underlying issue causing the fault code.

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Naing Min Htun
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8K views2 pages

128 Psid 94

This document provides information about a fault code detected by a Volvo engine control unit related to low fuel feed pressure. It describes the fault mode, detection conditions, symptoms, and possible causes for the fault. The faults include fuel pressure below static and engine speed dependent minimum values as well as voltage levels outside the normal range. Suggested causes are issues like a clogged fuel filter or defective fuel pump that could result in low fuel pressure. The document aims to help technicians diagnose and resolve the underlying issue causing the fault code.

Uploaded by

Naing Min Htun
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Volvo Guided Diagnostics

Date: Information Type:


11/17/2011 Diagnostics Fault Codes 128: Engine ECU 94: Fuel feed pressure
Profile:
EXC, EC290B LC (Volvo) [GB] EXC, EC290B LC (Volvo) [GB] EXC, EC290B LC (Volvo) [GB] EXC, EC290B LC (Volvo) [GB]
EXC, EC290B LC (Volvo) [GB]

MID128 Engine ECU;PID94 Fuel feed pressure(128 PID94)


128 PID94

Reference

Fault mode diagnosis

Fault mode Detection conditions:The engine control unit (E-ECU) registers: Fuel feed pressure below
FMI 1 static min value
Symptom: Possible causes:

 Red central warning  Clogged fuel filter


 Buzzer sounds continuously  Clogged fuel supply lines
 Error message screen  Contaminated fuel tank
 Fuel injection can be affected  Contaminated fuel
 Can cause low rail pressure  Defective fuel pump
 Low power  Air or leakage in fuel system
 Engine difficult to start  Defective sensor

Action 3021 128 PID94

Fault mode Detection conditions:The engine control unit (E-ECU) registers: that the voltage is above
FMI 3 4.75 V (EB16)
Symptom: Possible causes:

 Red central warning  Signal line short-circuited to


 Buzzer sounds continuously higher voltage
 Error message screen  Open circuit on frame ground
cable
 Defective sensor

Action 3021 128 PID94

Fault mode Detection conditions:The engine control unit (E-ECU) registers: that the voltage is below
FMI 5 0.25 V (EB16)
Symptom: Possible causes:

 Red central warning  Signal line short circuited to lower


 Buzzer sounds continuously voltage
 Error message screen  Open circuit on feed cable
 Open circuit on signal line
 Defective sensor
Action 3021 128 PID94

Fault mode Detection conditions:The engine control unit (E-ECU) registers: Fuel feed pressure below
FMI 7 engine speed dependent min value
Symptom: Possible causes:

 Red central warning  Clogged fuel filter


 Buzzer sounds continuously  Clogged fuel supply lines
 Error message screen  Contaminated fuel tank
 Fuel injection can be affected  Contaminated fuel
 Can cause low rail pressure  Defective fuel pump
 Low power  Air or leakage in fuel system
 Engine difficult to start  Defective sensor

Action 3021 128 PID94

Guided Diagnostics

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