DTC P0230: Fuel Pump Primary Circuit: Procedure

WARNING: This page is about a different car, the 2009 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.

CHECK ECM (FRP VOLTAGE)

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

Fig 1: Identifying ECM Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard voltage

Tester Connection	Condition	Specified Condition
FPR (A5-15) - E1 (E4-7)	STA signal ON	9 to 14 V
FPR (A5-15) - E1 (E4-7)	STA signal OFF	0 to 3 V

NG → REPLACE ECM

OK: Go to next step

INSPECT RELAY (Marking: F/PMP)

Remove the F/PMP relay from the engine room R/B No. 2.

Fig 2: Identifying Relay Test Terminals
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Measure the resistance according to the value(s) in the table below.

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: Go to next step

CHECK HARNESS AND CONNECTOR (F/PMP RELAY - ECM)

Remove the F/PMP relay from the engine room R/B No. 2.

Fig 3: Identifying Connector & Terminals Of Relay
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the A5 ECM connector.

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

Standard resistance

Tester Connection	Specified Condition
F/PMP relay terminal 2 - FPR (A5-15)	Below 1 Ω
F/PMP relay terminal 2 or FPR (A5-15) - Body Ground	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → REPLACE ECM