Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VIAN
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 - 08/2016]
Title: 2GR-FE (ENGINE CONTROL): SFI SYSTEM: P0230; Fuel Pump Primary Circuit; 2016 MY Sienna [12/2015 - 08/2016]

DTC

P0230

Fuel Pump Primary Circuit

DESCRIPTION

As shown in the illustration, when the engine is cranked, current flows from the terminal ST1 of the ignition switch into the ECM and the ST (starter) relay coil and also current flows to terminal STA of the ECM (STA signal).

When the STA signal and NE signal are input to the ECM, Tr1 (power transistor 1) is turned ON, current flows to the coil of the circuit opening relay, the relay switches on, power is supplied to the fuel pump, and the fuel pump operates.

While the NE signal is generated (engine running), the ECM keeps the Tr1 ON (C/OPN relay ON) and the fuel pump also keeps operating.

The fuel pump speed is controlled at two levels (high speed or low speed) by engine condition (starting, light load, heavy load). When the engine starts (STA ON), Tr2 (power transistor 2) in the ECM is OFF, so the fuel pump relay closes and positive battery voltage is applied directly to the fuel pump. The fuel pump operated at high speed.

During idling or under light loads, Tr2 goes ON, and then power is supplied to the fuel pump via the fuel pump resistor. The fuel pump operates at low speed.

DTC No.

DTC Detection Condition

Trouble Area

P0230

Open or short in FUEL PMP relay circuit

(1 trip detection logic)
  • Open or short in FUEL PMP relay circuit
  • FUEL PMP relay
  • ECM

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

HINT:

This troubleshooting procedure is based on the premise that the engine can start. If the engine cannot start, proceed to Problem Symptoms Table (See page 2016 MY Sienna [12/2015 - 08/2016]; 2GR-FE (ENGINE CONTROL): SFI SYSTEM: PROBLEM SYMPTOMS TABLE ).

PROCEDURE

1.

INSPECT FUEL PMP RELAY

(a) Inspect the FUEL PMP relay (See page 2016 MY Sienna [12/2015 - 08/2016]; 2GR-FE (ENGINE CONTROL): RELAY: ON-VEHICLE INSPECTION+ ).

NG

REPLACE F/PMP RELAY
OK

2.

CHECK TERMINAL VOLTAGE (FUEL PMP RELAY)

(a) Remove the FUEL PMP relay from the engine room relay block.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

2 (FUEL PMP relay holder) - Body ground

Cranking

11 to 14 V

2 (FUEL PMP relay holder) - Body ground

Ignition switch ON

0 to 3 V

Text in Illustration

*1

Engine Room Relay Block

*2

FUEL PMP Relay Holder
NG

CHECK FUEL PUMP CONTROL CIRCUIT

OK

3.

CHECK HARNESS AND CONNECTOR (FUEL PMP RELAY - ECM)

(a) Remove the FUEL PMP relay from the engine room relay block.

(b) Disconnect the ECM connector.

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

Standard Resistance (Check for Open):

Tester Connection

Condition

Specified Condition

1 (F/PMP relay holder) - A39-48 (FPR)

Always

Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection

Condition

Specified Condition

1 (F/PMP relay holder) or A39-48 (FPR) - Body ground

Always

10 kΩ or higher
OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR