Dtc P0230 Fuel Pump Primary Circuit

Engine. Lexus Gs430, Gs300. Uzs190 Grs190
3Uz-Fe Engine Control System. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK ECM (FRP VOLTAGE)

INSPECT RELAY (Marking: F/PMP)

CHECK WIRE HARNESS (F/PMP RELAY - ECM)

DTC P0230 Fuel Pump Primary Circuit


DESCRIPTION

When the engine is cranked, a signal is sent from the power source control ECU's STSW terminal to the ECM's STSW terminal. Then voltage travels from the ECM's STAR terminal through the park/neutral position switch to the STARTER relay coil. The STAR terminal also sends a signal to the STA terminal. When the STA signal and NE signal are input to the ECM, the ECM interior's Tr1 turns on, which causes power to be supplied to the C/OPN relay coil (C/OPN on). As a result, the F/PMP relay actuates, which causes the fuel pump to operate. If the engine is operating and NE signals are being output, the ECM interior's Tr1 is on (C/OPN on), and the fuel pump will continue operating. The fuel pump has a high and low speed setting. When the engine is starting or operating with a heavy load, the ECM interior's Tr2 turns on to actuate the F/PMP relay so that the fuel pump operates at the high speed setting. When the engine is idling or operating with a light load, the Tr2 turns off, and current flows through the fuel pump resistor to the fuel pump so that the fuel pump operates at the low speed setting.

Lexus Gs430, Gs300. Uzs190 Grs190.3Uz-Fe Engine Control System.Sfi System. Dtc P0230 Fuel Pump Primary Circuit


DTC No.
DTC Detection Condition
Trouble Area
P0230
Open or short in fuel pump relay circuit for 1 second or more (1 trip detection logic)
  1. Open or short in F/PMP relay circuit
  2. F/PMP relay
  3. ECM

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.3Uz-Fe Engine Control System.Sfi System. Dtc P0230 Fuel Pump Primary Circuit

HINT:
This troubleshooting procedure is based on the premise that the engine is started. If the engine is not started, proceed to the problem symptoms table (Click here).

INSPECTION PROCEDURE

1.CHECK ECM (FRP VOLTAGE)
Lexus Gs430, Gs300. Uzs190 Grs190.3Uz-Fe Engine Control System.Sfi System. Dtc P0230 Fuel Pump Primary Circuit

  1. Measure the voltage of the ECM connectors.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    A6-15 (FPR) - E7-7 (E1)
    		STA signal ON
    		9 to 14 V
    A6-15 (FPR) - E7-7 (E1)
    		STA signal OFF
    		0 to 3 V


NG
REPLACE ECM
OK


2.INSPECT RELAY (Marking: F/PMP)
Lexus Gs430, Gs300. Uzs190 Grs190.3Uz-Fe Engine Control System.Sfi System. Dtc P0230 Fuel Pump Primary Circuit

  1. Remove the F/PMP relay from the engine room No. 2 relay block.

  1. Measure the resistance of the F/PMP relay.

    Standard resistance:
    Tester Connection
    		Specified Condition
    3 - 4
    		Below 1 Ω
    3 - 4
    		10 kΩ or more
    (when battery voltage is applied to terminals 1 and 2)


NG
REPLACE RELAY
OK


3.CHECK WIRE HARNESS (F/PMP RELAY - ECM)
Lexus Gs430, Gs300. Uzs190 Grs190.3Uz-Fe Engine Control System.Sfi System. Dtc P0230 Fuel Pump Primary Circuit

  1. Remove the F/PMP relay from the engine room No. 2 relay block.

  1. Disconnect the A6 ECM connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    Relay block F/PMP relay terminal 1 - A6-15 (FPR)
    		Below 1 Ω
    Relay block F/PMP relay terminal 1 or A6-15 (FPR) - Body Ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE ECM