Test Procedure

MD1 CHECK FOR DTCS

Are DTCs P008A, P01C4, P01C5, P01C6 or P2539 present?

Yes	No
For DTCs P008A or P2539, GO to MD2. For all others, GO to MD9.	RETURN to SYMPTOM CHARTS for further direction.

MD2 CHECK THE FUEL DELIVERY PRESSURE SWITCH FOR CORRECT OPERATION

Ignition ON, engine OFF.
Access the PCM and monitor the LP_FUEL_SW (MODE) PID.
Access the PCM and control the FP (MODE) PID.
Command the fuel pump ON then OFF.

Does the LP_FUEL_SW PID state change from Low to Not Low?

Yes	No
GO to MD8.	GO to MD3.

MD3 CHECK THE FUEL DELIVERY PRESSURE SWITCH

Ignition OFF.
Fuel Delivery Pressure Switch connector disconnected.

Measure the resistance between:

(+) Fuel Delivery Pressure Switch Connector, Component Side	(-) Fuel Delivery Pressure Switch Connector, Component Side
FDPS - Pin 1	GND - Pin 2

Is the resistance between 0 Ohm - 5 ohms?

Yes	No
GO to MD4.	INSTALL a new Fuel Delivery Pressure Switch. REFER to the Service Information, Electronic Engine Controls. Clear the PCM DTCs. REPEAT the self-test.

MD4 CHECK THE GND CIRCUIT

Measure the resistance between:

(+) Fuel Delivery Pressure Switch Connector, Harness Side	(-)
GND - Pin 2	Ground

Is the resistance less than 5 ohms?

Yes	No
GO to MD5.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

MD5 CHECK THE FDPS CIRCUIT FOR AN OPEN

PCM-T connector disconnected.

Measure the resistance between:

(+) Fuel Delivery Pressure Switch Connector, Harness Side	(-) PCM-T Connector, Harness Side
FDPS - Pin 1	FDPS - Pin 23

Is the resistance less than 5 ohms?

Yes	No
GO to MD6.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

MD6 CHECK THE FDPS CIRCUIT FOR A SHORT TO GROUND

Measure the resistance between:

(+) Fuel Delivery Pressure Switch Connector, Harness Side	(-)
FDPS - Pin 1	Ground

Is the resistance greater than 10K ohms?

Yes	No
GO to MD7.	REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.

MD7 CHECK THE FDPS CIRCUIT FOR A SHORT TO VOLTAGE

Ignition ON, engine OFF.

Measure the voltage between:

(+) Fuel Delivery Pressure Switch Connector, Harness Side	(-)
FDPS - Pin 1	Ground

Is any voltage present?

Yes	No
REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.	GO to MD8.

MD8 INTERMITTENT CHECK

Ignition OFF.
Fuel Delivery Pressure Switch connector connected.
PCM-T connector connected.
Access the PCM and monitor the LP_FUEL_SW (MODE) PID.
Access the PCM and control the FP (MODE) PID.
Command the fuel pump ON.
While observing the PID, carry out the following:
- Wiggle all accessible harness from the fuel delivery pressure switch to the PCM and lightly tap on the switch.
- Wiggle the fuel delivery pressure switch connector.
- Look for sudden changes in the PID state when the harness and connector are wiggled or when the fuel delivery pressure switch is tapped.

Is a concern present?

Yes	No
REPAIR as necessary. Clear the PCM DTCs. REPEAT the self-test.	For PID state does not change from LOW to NOT LOW, INSTALL a new Fuel Delivery Pressure Switch. REFER to the Service Information, Electronic Engine Controls. Clear the PCM DTCs. REPEAT the self-test. For all others, The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

MD9 CHECK THE VREF AND SIGRTN CIRCUITS FOR AN OPEN

Ignition OFF.
Fuel Pressure And Temperature Sensor connector disconnected.
Ignition ON, engine OFF.

Measure the voltage between:

(+) Fuel Pressure And Temperature Sensor Connector, Harness Side	(-) Fuel Pressure And Temperature Sensor Connector, Harness Side
VREF - Pin 3	SIGRTN - Pin 4

Is the voltage between 4.5 - 5.5 V?

Yes	No
GO to MD10.	GO to PINPOINT TEST B .

MD10 CHECK THE FLP CIRCUIT FOR AN OPEN

Ignition OFF.
PCM-E connector disconnected.

Measure the resistance between:

(+) Fuel Pressure And Temperature Sensor Connector, Harness Side	(-) PCM-E Connector, Harness Side
FLP - Pin 2	FLP - Pin 34

Is the resistance less than 5 ohms?

Yes	No
GO to MD11.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

MD11 CHECK THE FLP CIRCUIT FOR A SHORT TO GROUND OR SIGRTN

Measure the resistance between:

(+) Fuel Pressure And Temperature Sensor Connector, Harness Side	(-)
FLP - Pin 2	Ground

Measure the resistance between:

(+) Fuel Pressure And Temperature Sensor Connector, Harness Side	(-) Fuel Pressure And Temperature Sensor Connector, Harness Side
FLP - Pin 2	SIGRTN - Pin 4

Are the resistances greater than 10K ohms?

Yes	No
GO to MD12.	REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.

MD12 CHECK THE FLP CIRCUIT FOR A SHORT TO VOLTAGE

Ignition ON, engine OFF.

Measure the voltage between:

(+) Fuel Pressure And Temperature Sensor Connector, Harness Side	(-)
FLP - Pin 2	Ground

Is any voltage present?

Yes	No
REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.	GO to MD13.

MD13 INDUCE A LOW VOLTAGE ON THE FLP CIRCUIT

Ignition OFF.
PCM-E connector connected.

Connect a 5 amp fused jumper wire between the following:

Point A Fuel Pressure And Temperature Sensor Connector, Harness Side	Point B Fuel Pressure And Temperature Sensor Connector, Harness Side
FLP - Pin 2	SIGRTN - Pin 4

Ignition ON, engine OFF.
Access the PCM and monitor the FLP_V (VOLT) PID.

Is the voltage less than 0.1 V?

Yes	No
INSTALL a new Fuel Pressure And Temperature sensor. REFER to the Service Information, Electronic Engine Controls. Clear the PCM DTCs. REPEAT the self-test.	GO to MD14.

MD14 CHECK FOR CORRECT PCM OPERATION

Disconnect all the PCM connectors.
Visually inspect for:
- pushed out pins.
- corrosion.
Connect all the PCM connectors and make sure they seat correctly.
Carry out the PCM self-test.
Verify the concern is still present.

Is the concern still present?

Yes	No
INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.