P1235

2UR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1235, P1236: High Pressure Fuel Pump Circuit
P1236 - High Pressure Fuel Pump No. 2 Circuit

DESCRIPTION

The fuel pump for high pressure has a plunger and a spill control valve. The plunger reciprocates by the camshaft rotation and pumps the fuel into the direct fuel injectors. The spill control valve regulates the fuel flow from the fuel tank to the plunger. When the spill control valve opens (ON), the fuel pressure rises. The injector driver operates the spill control valve using DC 50 V. The engine control module (ECM) controls the injector driver to maintain the fuel pressure at 4000 to 13000 kPa (40.8 to 132.6 kgf/cm2, 580 to 1885 psi).





MONITOR DESCRIPTION

The injector driver has the integrated circuit (IC) which monitors the electrical circuit between the spill control valve and injector driver. If an open circuit is detected, the IC sends the malfunction signal (FPD, FPD2) to the ECM. Then, the ECM illuminates the malfunction indicator lamp (MIL) and sets a DTC immediately.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





CONFIRMATION DRIVING PATTERN





1. Connect the Techstream to the DLC3.

2. Turn the power 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 power switch off and wait for at least 30 seconds.

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

6. Put the engine in inspection mode Inspection Mode Procedure.

7. Start the engine.

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

9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

10. Read the DTCs [C].

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

11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

12. Input the DTC: P1235 and P1236.

13. Check the DTC judgment result.





HINT
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE or N/A, perform steps [B] and [C] again.

14. If the test result is INCOMPLETE or N/A 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. Freeze frame data records the engine condition when malfunctions are detected. 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. CHECK DTC

(a) Interchange the injector driver No. 1 and No. 2 Removal.

NOTICE:
Do not disconnect and reconnect the connectors with the power switch on (IG), as the injector driver (EDU) may be damaged.





(b) Connect the Techstream to the DLC3.

(c) Turn the power switch on (IG) and turn the Techstream ON.

(d) Clear DTCs Reading and Clearing Diagnostic Trouble Codes.

NOTICE:
Before clearing the DTCs, write them down.

(e) Put the engine in inspection mode Inspection Mode Procedure.

(f) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

(g) Read DTC.

Result





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

2. INSPECT SPILL CONTROL VALVE

(a) Disconnect the E43 or E35 spill control valve connector.





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

Standard resistance:





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

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

(a) Disconnect the E16 or E28 injector driver (EDU) connector.





(b) Disconnect the E43 or E35 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





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

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

(a) Disconnect the E15 injector driver (No. 1) connector.





(b) Disconnect the E27 injector driver (No. 2) connector.

(c) Disconnect the E4 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):





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE ECM Removal