P1235

2GR-FSE ENGINE CONTROL: SFI SYSTEM: P1235: High Pressure Fuel Pump Circuit
P1235 - High Pressure Fuel Pump 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 exhaust side camshaft (right bank).

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/cm, 580 to 1886 psi) according to the operating condition, and it feeds the fuel to the fuel delivery pipe.





MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





CONFIRMATION DRIVING PATTERN





1. Connect the Techstream to the DLC3.

2. Turn the engine switch on (IG) and turn the Techstream on.

3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) Reading and Clearing Diagnostic Trouble Codes.

4. Turn the engine switch off and wait for 30 seconds.

5. Turn the engine switch on (IG) and turn the Techstream on [A].

6. Start the engine.

7. Idle the engine for 10 seconds [B].

8. Enter the following menus: Powertrain / Engine / Trouble Codes.

9. Read the DTC [C].

HINT
- If a DTC is output, the system is malfunctioning.
- If a DTC is not output, perform the following procedure.

10. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

11. Input the DTC: P1235.

12. Check the DTC judgment result.





HINT
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows INCOMPLETE or UNKNOWN, perform step [B] again.

13. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

14. Check the DTC judgment result.

HINT
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows NORMAL, the system is normal.

15. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs Reading and Clearing Diagnostic Trouble Codes.

HINT
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.

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 help determine if the vehicle was moving or stationary, 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.

PROCEDURE

1. INSPECT FUEL PUMP FOR HIGH PRESSURE

(a) Disconnect the fuel pump for high pressure connector.





(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





Text in Illustration





(c) Reconnect the fuel pump for high pressure connector.

NG -- REPLACE FUEL PUMP FOR HIGH PRESSURE Removal
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (INJECTOR DRIVER - FUEL PUMP FOR HIGH PRESSURE)

(a) Disconnect the injector driver (EDU) connector.

(b) Disconnect the fuel pump for high pressure 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 fuel pump for high pressure connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (INJECTOR DRIVER - HIGH PRESSURE SIDE FUEL PUMP)
OK -- Continue to next step.

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

(a) Disconnect the ECM connector.

(b) Disconnect the 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 (INJECTOR DRIVER - ECM)
OK -- Continue to next step.

4. INSPECT ECM (FPD AND FPF1 VOLTAGE)

(a) Inspect the ECM using an oscilloscope.





(1) While the engine is warm and idling, check the waveform the terminals of the ECM connector.





Standard Voltage:





HINT
FPD terminal waveform is output only right after the engine starts.

Result:





HINT
*: If the FPF1 terminal waveform is similar to the FPF1 terminal waveform NG waveform 1 shown in the illustration, stop the engine and disconnect the injector driver connector. Then turn the engine switch on (IG) again and check the differences between this FPF1 terminal waveform and the previous one.

B -- REPLACE INJECTOR DRIVER Removal

A -- REPLACE ECM Removal