2018 / ECLIPSE CROSS / EC - Workshop Manual
13 -FUEL > 13A-DIRECT INJECTION AND MULTIPOINT FUEL INJECTION (DI AND MPI) > TROUBLESHOOTING > DIAGNOSIS CODE PROCEDURES > CODE NO. P0628 FUEL PUMP (HIGH PRESSURE) CONTROL CIRCUIT LOW INPUT
Code No. P0628: Fuel Pump (High Pressure) Control Circuit Low Input
OPERATION
- The voltage is applied from the engine-ECU connector terminal HFP+ to the fuel pump (high pressure).
- The voltage is earthed to the engine-ECU connector terminal HFP- from the fuel pump (high pressure).
FUNCTION
- In response to the signal from the engine-ECU, the fuel pump (high pressure) controls fuel pressure.
TROUBLE JUDGEMENT
Check Conditions
- After 2 seconds since the ignition switch is turned ON or since the completion of engine start.
- Battery positive voltage is more than 10 V and is less than 16.5 V.
- Power supply voltage for fuel pump (high pressure) driver is more than 10 V.
Judgement Criterion
- A malfunction by ground fault occurred for 2 seconds.
FAIL-SAFE AND BACKUP FUNCTION
- While prohibiting the operation of the injector (high pressure), carry out the control by the injector operation only.
- Torque is restricted.
PROBABLE CAUSES
- Failed fuel pump (high pressure)
- Short circuit or harness damage in fuel pump (high pressure) circuit or loose connector contact
- Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Check fuel pump (high pressure) itself.
STEP 2. Check of short to earth, and damage in HFP+ line between fuel pump (high pressure) connector and engine-ECU connector.
Is the check result normal?
Go to Step 3. 
Repair the connector(s) or wiring harness.
STEP 3. Check of short to earth, and damage in HFP- line between fuel pump (high pressure) connector and engine-ECU connector.
Is the check result normal?
Go to Step 4. Repair the connector(s) or wiring harness.
STEP 4. M.U.T.-IIISE diagnosis code
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