Check for damaged harness and terminals including rubber seals :

-. contact resistance, oxidation, corrosion, bent or broken terminals

-. harness connector connection, loose wires etc.

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

P0230/C018_C019

Check items with the scan tool and the multimeter

① Wiring harness inspection

② Check the fuse

③ Check the relay resistance

Specification :

Turn the ignition switch ON, and measure the voltage at the ECM terminal 17/C230-1.

IS THERE A BATTERY VOLTAGE ?

YES

NO

a.

Repair short in the wire between the fuel pump relay terminal 5 and the B+ fuse (50A)

b.

Repair short in the wire between the fuel pump relay terminal 3 and the ECM terminal 17/C230-1.

c.

Replace the fuse if the fuse is broken. Replace the relay if the relay is defective after checking the continuity between the relay terminal 3 and terminal 5. For more detailed information, Go to "Component Inspection" procedure

d.

Go to step 3

Measure the voltage at the ECM terminal 17/C230-1 when turning the ignition switch ON after 3 seconds.

IS THERE A BATTERY VOLTAGE ?

YES

NO

Connect the CH A,B probe of scan tool to the ECM terminal 17/C230-1 and the relay terminal 2 in order to check the signal waveform.

Check the signal waveform when turning the ignition switch OFF and ON several times.

IS THERE THE SIGNAL WAVEFORM PROPERLY DISPLAYED ?

YES

NO

a.

Replace a known - good ECM and recheck. If the signal waveform is displayed, replace the ECM.

WAVEFORM ANALYSIS

This test should be inspected after depressing the HOLD mode after turning the ignition switch ON, When the ground is connected to the terminal 17/C230-1 by the ECM the battery voltage is supplied to the electric fuel pump through the relay terminal 2. If the waveform pattern is not indicated as above waveform, replace the relay.

YES

Disconnect the fuel pump relay after turning the ignition switch ON, measure the voltage at the terminal 1 and terminal 5 individually.

ARE THERE THE BATTERY VOLTAGE ?

YES

NO

ARE THE FUSES BLOWN ?

YES

NO

Connect the scan tool to the data link connector(DLC) and turn the ignition switch ON.

Fix the fuel pressure and fuel pump relay current data.

Check the current data when turning the ignition switch ON

ARE THE FUEL PRESSURE AND THE FUEL PUMP REALY ON CURRENT DATA PROPERLY DISPLAYED ?

YES

NO

a.

Replace the relay if the relay is defective after checking the continuity between the relay terminal 3 and terminal 5 For more detailed information, Go to "Component Inspection" procedure

b.

Recheck open or short in the wire between the fuel pump relay terminal 3 and the ECM terminal 17/C230-1.

c.

Go to step 8

CURRENT DATA ANALYSIS

The fuel pressure should be increased above 3.5 bar for 3 sec. when turning the ignition switch ON. Fuel pressure idle set value shoul be displayed appoxi. 220 ~ 300 bar (around 1V) while idling and changes on acceleration.Fuel pump relay should be displayed ON when craking and running the engine.

Check the fuel pump operation at the ECM terminal 17/C230-1 when turning the ignition switch ON.

IS THERE FUEL PUMP ON FOR 3 SECONDS ?

YES

NO

Connect the CH A,B probe of scan tool to the ECM terminal 17/C230-1 and the relay terminal 2 in order to check the signal waveform.

Check the signal waveform when turning the ignition switch OFF and ON several times.

IS THERE THE SIGNAL WAVEFORM PROPERLY DISPLAYED ?

YES

NO

a.

Replace a known - good ECM and recheck. If the signal waveform is displayed, replace the ECM.

WAVEFORM ANALYSIS

This test should be inspected after depressing the HOLD mode after turning the ignition switch ON When the ground is connected to the terminal 17/C230-1 by the ECM the battery voltage is supplied to the electric fuel pump through the relay terminal 2. If the waveform pattern is not indicated as above waveform, replace the relay.

YES