Toyota Tundra. Manual — part 1592

Fig. 207: Identifying A24 ECM Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b. Measure the voltage according to the value (s) in the table below.

Standard voltage

VOLTAGE SPECIFIED CONDITION

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE ECM (See REMOVAL )

DTC P109C OPEN IN FUEL PRESSURE SWITCHING VALVE CIRCUIT; DTC P109D SHORT IN
FUEL PRESSURE SWITCHING VALVE CIRCUIT

DESCRIPTION

A Flexible Fuel Vehicle (FFV) can be used with a fuel containing a high concentration of ethyl alcohol. This
FFV uses a fuel pressure switching system which changes the fuel pressure to low or high using a fuel pressure
switching valve.

DTC DETECTION CONDITION AND TROUBLE AREA REFERENCE CHART

Tester Connection

Condition

Specified Condition

A24-36 (STP) - Body ground Brake pedal is depressed

11 to 14 V

A24-36 (STP) - Body ground Brake pedal is released

Below 1 V

DTC

DTC Detection Condition

Trouble Area

P109C

The fuel pressure switching valve
relay circuit is open or shorted to
ground. (1 trip detection logic)



Fuel pressure switching
valve circuit



F/PMP VSV relay



ECM

P109D

The fuel pressure switching valve

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

MONITOR DESCRIPTION

These DTCs are stored when a malfunction is detected in the fuel pressure switching valve circuit. If the voltage
of the fuel pressure switching valve circuit is different from the voltage commanded by the ECM, the ECM
determines that the fuel pressure switching valve circuit is open or shorted, and stores a DTC.

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

P109C

TYPICAL MALFUNCTION THRESHOLDS CONDITIONS - P109C

relay circuit is shorted to the
power supply. (1 trip detection
logic)



Fuel pressure switching
valve circuit



F/PMP VSV relay



ECM

Related DTCs

P109C F/PMP VSV relay range check (Low voltage)
P109D F/PMP VSV relay range check (High voltage)

Required Sensors/Components (Main)

F/PMP VSV relay

Required Sensors/Components (Related)

-

Frequency of Operation

Continuous

Duration

3 seconds

MIL Operation

None

Sequence of Operation

None

Monitor runs whenever following DTCs not present

None

Battery voltage

8 V or higher

gnition switch

ON

Starter

OFF

When either condition below is met

Condition 1 or 2

1. When both conditions below are met

Condition a and b

a. Current F/PMP VSV relay

OFF

b. Last F/PMP VSV relay

OFF

2. When both conditions below are met

Condition a and b

a. Current F/PMP VSV relay

ON

b. Last F/PMP VSV relay

ON

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

P109D

TYPICAL MALFUNCTION THRESHOLDS CONDITIONS - P109D

WIRING DIAGRAM

Fig. 208: Fuel Pressure Switching Valve - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

HINT

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

1. INSPECT RELAY (F/PMP VSV)

a. Remove the fuel pressure control valve relay (F/PMP VSV) from the engine room relay block.

b. Measure the resistance according to the value (s) in the table below.

Standard Resistance

RESISTANCE SPECIFIED CONDITIONS

F/PMP VSV relay output terminal voltage

Low

F/PMP VSV relay output terminal voltage

High

Tester Connection

Condition

Specified Condition

3-5

When no battery voltage applied to terminals 1 and 2 10 kohms or higher

3-5

When battery voltage applied to terminals 1 and 2

Below 1 ohms

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

Fig. 209: Identifying Relay Terminals With Circuit (F/PMP VSV)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPLACE RELAY (F/PMP VSV)

OK: Go to Next Step

2. INSPECT RELAY (POWER SOURCE VOLTAGE)

a. Remove the fuel pressure control valve relay (F/PMP VSV) from the engine room relay block.

b. Turn the ignition switch to ON.

c. Measure the voltage according to the value (s) in the table below.

Standard Voltage

VOLTAGE SPECIFIED CONDITION

Fig. 210: Identifying Fuel Pressure Control Valve Relay (F/PMP VSV) Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Tester Connection

Switch Condition Specified Condition

F/PMP VSV relay (2) - Body ground Ignition switch ON

11 to 14 V

F/PMP VSV relay (5) - Body ground Ignition switch ON

11 to 14 V

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra