P1235

4GR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1235: High Pressure Fuel Pump Circuit

DTC P1235 - High Pressure Fuel Pump Circuit

DESCRIPTION

The high pressure side fuel pump 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 exhaust side camshaft (right bank).
The high pressure side fuel pump 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/cm, 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 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 Freeze Frame Data.

PROCEDURE

1. INSPECT FUEL PUMP FOR HIGH PRESSURE




(a) Disconnect the E41 fuel pump for high pressure connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(c) Reconnect the fuel pump for high pressure connector.
NG -- REPLACE FUEL PUMP FOR HIGH PRESSURE
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (INJECTOR DRIVER - HIGH PRESSURE SIDE FUEL PUMP)




(a) Disconnect the E58 injector driver (EDU) connector.
(b) Disconnect the E41 high pressure side fuel pump connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):






Standard resistance (Check for short):





(d) Reconnect the injector driver (EDU) connector.
(e) Reconnect the high pressure side fuel pump connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. INSPECT ECM (FPD AND FPF1 VOLTAGE)




(a) Start the engine, and check the waveforms between terminals FPF1 and E1, and FPD and E1 of the E6 and E4 ECM connectors.
HINT:
The correct waveform is as shown in the illustration.





OK -- REPLACE ECM
NG -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (INJECTOR DRIVER - ECM)




(a) Disconnect the E6 ECM connector.
(b) Disconnect the E26 injector driver (EDU) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):






Standard resistance (Check for short):





(d) Reconnect the ECM connector.
(e) Reconnect the injector driver (EDU) connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE INJECTOR DRIVER