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Engine Management – V6 – Diagnostics Page 6C1-2–154
• Refer to 6D1-1 Charging System – V6 for details of the charging system operation. • Since fault condition in a wiring connector may trigger DTCs, always test the connectors related to this diagnostic • To assist diagnosis, refer to 3 Wiring Diagrams and Connector Charts in this Section, for the system wiring diagram and connector charts. DTC P0625 or P0626 Diagnostic Table Step Action Yes No 1 Has the Diagnostic System Check been performed?
Go to Step 2 Refer to 4.4 Diagnostic this Section 2 1 Switch off the ignition for 30 seconds. 2 Operate the vehicle within the conditions for running the DTC. 3 Using Tech 2, select the DTC display function. Does DTC P0625 or P0626 fail this ignition cycle? Go to Step 3 Refer to Additional Information in this DTC 3 Test the charging system for any fault condition that may cause Was any fault found and rectified? Go to Step 6 Go to Step 4 4 Test the Gen F signal circuit for a high resistance, open circuit, short Was any fault found and rectified? Go to Step 6 Go to Step 5 5 Replace the ECM. Refer to Refer to 6C1-3 Engine Management – V6 Was the repair completed? Go to Step 7 — 6 1 Using Tech 2, clear the DTCs. 2 Switch off the ignition for 30 seconds. 3 Start the engine. 4 Operate the vehicle within the conditions for running the DTC. Does any of the Generator F-terminal circuit DTCs fail this ignition Go to Step 2 Go to Step 8 7 Using Tech 2, select the DTC display function. Does Tech 2 display any DTCs? Go to the appropriate DTC Table in this Section System OK When all diagnosis and repairs are completed, check the system for correct operation. 7.37 DTC P0627, P0628 or P0629 DTC Descriptors This diagnostic procedure supports the following DTCs: • DTC P0627 – Fuel Pump Relay Circuit Malfunction • DTC P0628 – Fuel Pump Relay Voltage Low • DTC P0629 – Fuel Pump Relay Voltage High |