P1235

1UR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1235: High Pressure Fuel Pump Circuit

DTC P1235 - High Pressure Fuel Pump Circuit

DTC P1236 - High Pressure Fuel Pump No. 2 Circuit

DESCRIPTION

The fuel pump for high pressure is attached to the insulator, which is attached to the cylinder head cover. The pump activates according to the position of the cam on the intake side camshaft (bank 1 and bank 2).
The fuel pump for high pressure increases the pressure of the fuel supplied from the fuel pump in the fuel tank to 4 to 13 MPa (40.8 to 132.6 kgf/cm2, 580 to 1885 psi) according to the operating condition, and it feeds the fuel to the fuel delivery pipe.






MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





WIRING DIAGRAM





INSPECTION PROCEDURE
HINT: Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE

1. CHECK DTC




(a) Interchange the injector drivers No. 1 and No. 2 Components.
(b) Connect the Techstream to the DLC3.
(c) Turn the engine switch on (IG) and turn the Techstream ON.
(d) Clear DTCs DTC Check / Clear.
NOTE:
Before deleting the DTCs, write them down.
(e) Start the engine.
(f) Enter the following menus: Powertrain / Engine / Trouble Codes.
(g) Read DTC.
Result:






B -- REPLACE INJECTOR DRIVER
A -- Continue to next step.

2. INSPECT SPILL CONTROL VALVE




(a) Disconnect the spill control valve connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(c) Reconnect the spill control valve connector.
NG -- REPLACE FUEL PUMP FOR HIGH PRESSURE
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (INJECTOR DRIVER - SPILL CONTROL VALVE)




(a) Disconnect the injector driver (EDU) connector.
(b) Disconnect the spill control valve connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):

No. 1





No. 2





Standard resistance (Check for short):

No. 1





No. 2





(d) Reconnect the EDU connector and spill control valve connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (INJECTOR DRIVER - ECM)




(a) Disconnect the injector driver (No. 1) connector.
(b) Disconnect the injector driver (No. 2) connector.
(c) Disconnect the ECM connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):






Standard resistance (Check for short):





(e) Reconnect the EDU connectors and ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM