P0230
2GR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0230: Fuel Pump Primary Circuit
DTC P0230 - Fuel Pump Primary Circuit
DESCRIPTION
Based on vehicle driving conditions, the ECM operates the fuel pump. The ECM receives an engine start request signal from the hybrid vehicle control ECU. When the engine is cranked, an NE signal is sent to the ECM. When the engine is started, the ECM connects the FC circuit to the body ground, operates the C/OPN (circuit opening) relay, and operates the fuel pump.
The fuel pump's has a high and low speed setting. When the engine is starting or operating with a heavy load, the ECM's Tr2 turns off, the F/PMP relay turns on, and the fuel pump operates at the high speed setting. When the engine is idling or operating with a light load, the Tr2 turns off, current flows through the fuel pump resistor to the fuel pump, and the fuel pump operates at the low speed setting.
When the ECM receives an engine stop request signal from the hybrid vehicle control ECU, or when fuel cut occurs as a result of vehicle deceleration, etc., the fuel pump is stopped.
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. PERFORM ACTIVE TEST USING TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG) and turn the Techstream on.
(c) Enter the following menus: Powertrain / Engine and ECT / Active Test / Active the Fuel Pump Speed Control.
(d) Check the operation of the relay while operating it using the Techstream.
OK:
Operating noise can be heard from the relay.
OK -- CHECK FOR INTERMITTENT PROBLEMS
NG -- Continue to next step.
2. INSPECT RELAY (Marking: F/PMP)
(a) Remove the F/PMP relay from the engine room No. 1 relay block.
(b) Measure the resistance of the F/PMP relay.
Standard resistance:
NG -- REPLACE 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. 1 relay block.
(b) Disconnect the A53 ECM connector.
(c) Measure the resistance.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM