Maxima SE V6-2968cc 3.0L DOHC MFI (VQ30DE) (1997)
Fuel Pump Relay: Testing and Inspection
Diagnostic Testing Procedure
SYSTEM DESCRIPTION
Fuel Pump ON-OFF Control
The ECM activates the fuel pump for several seconds after the ignition switch is turned ON to improve engine start-up. If the ECM receives a 1°
signal from the crankshaft position sensor (POS), it knows that the engine is rotating, and causes the pump to activate. If the 1° signal is not received
when the ignition switch is ON, the engine stalls. The ECM stops pump operation and prevents the battery from discharging, thereby improving safety.
The ECM does not directly drive the fuel pump. It controls the ON/OFF fuel pump relay, which in turn controls the fuel pump.
Condition Fuel Pump Operation
Ignition switch is turned to ON. Operates for 1 second
Engine running and cranking Operates
Except as shown above Stops
CONSULT REFERENCE VALUE IN DATA MONITOR MODE
Remarks: Specification data are reference values.