P0230

2GR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0230: Fuel Pump Primary Circuit

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.









WIRING DIAGRAM





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 Symptom Related Diagnostic Procedures.

INSPECTION PROCEDURE

PROCEDURE

1. CHECK ECM (FRP VOLTAGE)





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






NG -- REPLACE ECM
OK -- Continue to next step.
2. INSPECT F/PMP RELAY





(a) Remove the F/PMP relay from the engine room No. 2 relay block.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPLACE F/PMP RELAY
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (F/PMP RELAY - ECM)





(a) Remove the F/PMP relay from the engine room No. 2 relay block.
(b) Disconnect the A6 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):






Standard resistance (Check for short):






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM