Brand:

Toyota

Model Name:

4Runner GRN210 215 UZN210 215

Manual:

Repair Manual

Section:

1Gr-Fe Engine Control System

Title:

Sfi System

  1. Description

  2. Wiring diagram

  3. Inspection procedure

  4. Inspect ecm (fpr voltage)

  5. Inspect fuel pump relay

  6. Check harness and connector (fuel pump relay - ecm)

DTC P0230 Fuel Pump Primary Circuit


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DESCRIPTION

In the diagram below, when the engine is cranked, current flows from terminal ST1 of the ignition switch into the ECM to 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 (circuit opening 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 operates 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.

Open or short in fuel pump relay circuit 4Runner


DTC No.
DTC Detection Condition
Trouble Area
P0230
Open or short in fuel pump relay circuit
  1. Open or short in fuel pump relay circuit
  2. Fuel pump relay
  3. ECM

WIRING DIAGRAM


Sfi System - P2196 4Runner

HINT:
This DTC chart is on the premise that the engine is started normally. If the engine is difficult to start, proceed to the problem symptoms table (Click here).

INSPECTION PROCEDURE

HINT:
Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.
1.INSPECT ECM (FPR VOLTAGE)
  1. Measure the voltage of the ECM connector. Standard voltage:Tester ConnectionConditionSpecified ConditionFPR (E6-30) - E1 (E6-1)STA signal ON9 to 14 VFPR (E6-30) - E1 (E6-1)STA signal OFF0 to 3 V 4Runner

  2. Measure the voltage of the ECM connector.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    FPR (E6-30) - E1 (E6-1)
    		STA signal ON
    		9 to 14 V
    FPR (E6-30) - E1 (E6-1)
    		STA signal OFF
    		0 to 3 V


NGnext
REPLACE ECM
OK
next down

2.INSPECT FUEL PUMP RELAY
  1. Remove the fuel pump relay from the engine room R/B. 4Runner

  2. Remove the fuel pump relay from the engine room R/B.

  1. Measure the resistance of the fuel pump relay.

    Standard resistance:
    Tester Connection
    		Specified Condition
    3 - 4
    		Below 1 Ω
    3 - 5
    		10 kΩ or higher
    3 - 4
    		10 kΩ or higher
    (when battery voltage applied to terminals 1 and 2)
    3 - 5
    		Below 1 Ω
    (when battery voltage applied to terminals 1 and 2)


NGnext
REPLACE FUEL PUMP RELAY
OK
next down

3.CHECK HARNESS AND CONNECTOR (FUEL PUMP RELAY - ECM)
  1. Remove the fuel pump relay from the engine room R/B. 4Runner

  2. Remove the fuel pump relay from the engine room R/B.

  1. Disconnect the E6 ECM connector.

  1. Measure the resistance between wire harness side connectors.

    Standard resistance (Check for open):
    Tester Connections
    		Specified Conditions
    Fuel pump relay (1) - FPR (E6-30)
    		Below 1 Ω
    Standard resistance (Check for short):
    Tester Connections
    		Specified Conditions
    Fuel pump relay (1) or FPR (E6-30) - Body ground
    		10 kΩ or higher

  1. Reconnect the ECM connector.

  1. Reinstall the fuel pump relay.



NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
next down
REPLACE ECM