GM Service Manual Online
For 1990-2009 cars only
Table 1: Fuel Pump Flow Control Module Scan Tool Data Parameters
Table 2: Fuel Pump Flow Control Module Scan Tool Output Controls

Fuel Pump Flow Control Module Scan Tool Data Parameters

Parameter

System State

Expected Value

Description

Operating Conditions: Ignition ON/Engine Idling at Normal Operating Temperature / Vehicle is in Park or Neutral

Desired Fuel Rail Pressure

--

306.8 kPa (44.5 psi)

This displays kPa (psi). This is the desired fuel rail pressure.

Fuel Pump Command

--

On

The scan tool displays On or Off. This is the current state of the fuel pump command.

Fuel Pump Signal Command

--

Varies

This displays %. This is the commanded fuel pump signal measured in percentage.

Fuel Rail Pressure Sensor

--

296.4-310.3 kPa (43-45 psi)

This displays kPa (psi). This is the current pressure at the fuel rail pressure sensor.

Fuel Rail Pressure Sensor

--

4.90-5.01 Volts

This displays Volts. This is the fuel rail pressure sensor voltage.

Ignition 1 Signal

--

Varies

This displays Volts. This is the current ignition 1 signal.

LT Fuel Pump Trim

--

Varies

This displays a numeric value. This is the long term (LT) fuel pump trim.

ST Fuel Pump Trim

--

Varies

This displays a numeric value. This is the short term (ST) fuel pump trim.

Fuel Pump Flow Control Module Scan Tool Output Controls

Output Control

Description

Fuel Pressure Control

This output control is used to control the fuel pressure.

Fuel Pump

This output control is used to command the fuel pump ON and OFF.

Fuel Pump Trim Reset

This output control is used to reset the fuel pump trim.