Check for damaged harness and terminals including rubber seals :

Check for poor connection between ECM and component :

backed out terminal, improper mating, broken locks and poor terminal to wire connection

ARE THE WIRES O.K ? & ARE THE CONNECTIONS O.K ?

YES

NO

DTCs listed below are stored in the scan tool

P1182/P1183/P1184

Check items with the scan tool and the multimeter

① Wiring harness inspection

② Check the voltage from the ECM

③ Check the resistance

Specification

Disconnect the fuel pressure regulator and turn the ignition switch ON

measure the voltage at the FPR terminal 1.

ARE THERE THE BATTERY VOLTAGE FOR TERMINAL 1 AND 0V FOR TERMINAL 2 ?

YES

NO

c.

Go to step 3

Measure the voltage at the ECM terminal 27/C230-2 after turning the ignition switch ON

IS THERE A BATTERY VOLTAGE ?

YES

NO

Connect the fuel pressure regulator and turn the ignition switch ON, measure the voltage between the FPR terminal 1 and the FPR terminal 2

IS THERE A BATTERY VOLTAGE ?

YES

NO

Connect the CH A probe of scan tool to the fuel pressure regulator terminal 2 after turning the ignition switch OFF and then start the engine

Check the FPR signal waveform when depressing the accel pedal fully one time.

IS THERE THE FUEL PRESSURE REGULATOR SIGNAL WAVEFORM PRORERLY DISPLAYED ?

YES

NO

b.

Go to step 10

WAVEFORM ANALYSIS

This test should be inspected after depressing the HOLD mode at the operating range of FPR The time T becomes shorter when the FPR is opened increasingly. If the rectangular waveform pattern is distorted and omitted, replace the FPR. The cycle time T becomes shorter while idling. The rail pressure regulator is opening by the ECM duty control. The cycle time T becomes longer when accelerating. The rail pressure regulator is closing by the ECM duty control.

Connect the CH A probe of scan tool to the fuel pressure regulator terminal 28/C230-2 after turning the ignition switch OFF and then start the engine.

Check the FPR signal waveform when depressing the accel pedal fully one time.

IS THERE THE FUEL PRESSURE REGULATOR SIGNAL WAVEFORM PRORERLY DISPLAYED ?

YES

NO

Disconnect the fuel pressure regulator and turn the ignition switch ON, measure the voltage at the FPR terminal 1.

ARE THERE THE BATTERY VOLTAGE FOR THE TERMINAL 1 AND 0 V FOR THE TERMINAL 2 ?

YES

NO

c.

Go to step 3

Measure the voltage at the ECM terminal 27/C230-2 after turning the ignition switch ON.

IS THERE A BATTERY VOLTAGE ?

YES

NO

Connect the fuel pressure regulator and turn the ignition switch ON, measure the voltage between the FPR terminal 1 and the FPR terminal 2

IS THERE A BATTERY VOLTAGE ?

YES

NO

Connect the CH A probe of scan tool to the fuel pressure regulator terminal 2 after turning the ignition switch OFF and then start the engine

Check the FPR signal waveform when depressing the accel pedal fully one time.

IS THERE THE FUEL PRESSURE REGULATOR SIGNAL WAVEFORM PRORERLY DISPLAYED ?

YES

NO

b.

Go to step 10

WAVEFORM ANALYSIS

This test should be inspected after depressing the HOLD mode at the operating range of FPR The time T becomes shorter when the FPR is opened increasingly. If the rectangular waveform pattern is distorted and omitted, replace the FPR. The cycle time T becomes shorter while idling. The rail pressure regulator is opening by the ECM duty control. The cycle time T becomes longer when accelerating. The rail pressure regulator is closing by the ECM duty control.

Connect the CH A probe of scan tool to the fuel pressure regulator terminal 28/C230-2 after turning the ignition switch OFF and then start the engine.

Check the FPR signal waveform when depressing the accel pedal fully one time.

IS THERE THE FUEL PRESSURE REGULATOR SIGNAL WAVEFORM PRORERLY DISPLAYED ?

YES

NO

Measure the resistance of pressure regulator valve. For checking the fuel pressure regualtor , Go to "Component Inspection" procedure

Examine the system for the leakage.

Check the low and high pressure fuel line.

① Visually inspect for leakage and check all connector

② Block the fuel return line of the function block

③ Clog the fuel filter

Disconnect the electric connector from all injector and connect the scan tool.

Fix the fuel pressure and the feul pressure regulator current data.

Check the current data while operating the starting motor for 5 seconds

IS THERE MORE THAN 150 BAR IN THE FUEL PRESSURE ?

YES

NO

d.

Go to step 8

Connect the scan tool CH A probe to the fuel pressure regulator and CH B probe to the injector low side for the injector No.1 in order to check the signal waveform.

Check the fuel pressure regulator and the injector low side signal waveform while idling.

Check the fuel presure regulator and the injector low side signal waveform after turning the ignition switch OFF.

IS THERE NO THE INJECTOR LOW SIDE SIGNAL WAVEFOAM WITHOUT THE FUEL PRESSURE REGULATOR SUPPLY VOLTAGE AT THE SAME TIME ?

YES

NO

b.

Replace a known - good ECM and recheck. If the problem is verified, replace the ECM

WAVEFORM ANALYSIS

This test should be inspected after depressing the HOLD mode while idling. After the ignition switch off, the FPR signal waveform is output even from the battery voltage to 0V and the injector signal waveform should be not generated by the ECM. If the FPR and the injector signal waveform are generated by the ECM, replace the ECM.

YES