3.
ARE THE WIRES O.K ? & ARE THE CONNECTIONS O.K ?
YES
a.
Go to "Signal Circuit Inspection" procedure.
NO
a.
Repair as necessary and go to " Verification of Vehicle Repair " procedure
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
Go to "Signal Circuit Inspection" procedure.
NO
Repair as necessary and go to " Verification of Vehicle Repair " procedure
DTCs listed below are stored in the scan tool
P0231/P0232
Check items with the scan tool and the multimeter
① Wiring harness inspection
② Check the fuse
③ Check the relay resistance
Specification :
Resitance : below 1 Ω for open in the wire
Resitance : infinite for short to ground in the wire
Voltage : below 0.5V for short to power in the wire
Refer to the component and full circuit for connector configrations details
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
Go to step 4
NO
Go to step 3
ARE THE FUSES BLOWN ?
YES
Repair open or short in the wire between the fuel pump relay terminal 1 and the ECM fuse (30 A)
Repair open or short in the wire between the fuel pump relay terminal 5 and the fuse (15 A)
Repair open or short in the wire between the fuel pump relay terminal 3 and the ECM terminal 17/C230-1
Replace the fuse if the fuse is broken
Go to step 4
NO
Go to step 4
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
Go to "Verification of Vehicle Repair" procedure
NO
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
Recheck open or short in the wire between the fuel pump relay terminal 3 and the ECM terminal 17/C230-1.
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
Go to "Verification of Vehicle Repair" procedure
NO
Go to step 10
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
Go to "Verification of Vehicle Repair" procedure
NO
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
Go to "Verification of Vehicle Repair" procedure
Turn the ignition switch ON, and measure the voltage at the ECM terminal 17/C230-1.
IS THERE A BATTERY VOLTAGE ?
YES
Go to step 3
NO
Repair short in the wire between the fuel pump relay terminal 5 and the fuse (15 A)
Repair short in the wire between the fuel pump relay terminal 3 and the ECM terminal 17/C230-1.
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
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
Go to step 5
NO
Go to "Verification of Vehicle Repair" procedure
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
Go to "Verification of Vehicle Repair" procedure
NO
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
Go to "Verification of Vehicle Repair" procedure
