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3.2 LH Sequential Multiport Fuel Injectin System (LH-SFI)   >   34 Hydraulic Test Program - Test (Fuel Pump Test)

Test step DTC Test scope Test connection Test condition Nominal value Possible cause/Remedy 1.0 Fuel pumps Delivery capacity N3/2 or N3/3 66 76 (1.25) (1.35) Disconnect fuel return line at separation point. Hold fuel hose in measuring glass. Ignition: ON 1 liter after maximum 35 seconds Check fuel lines for restrictions (kinks and dents), 2.0 3.0 Replace fuel filter. 2.0 Fuel pumps Current draw Connect to sockets 1 and 3 (Figure 1) Unplug FP relay module. Ignition: ON 4 - 8 A Fuel pump 1 or 2, Note: If current draw is > 8 A, also replace FP relay module. 3.0 Fuel pressure after fuel pump 1 N3/2 or N3/3 66 76 (1.25) (1.35) Unscrew cap on fuel pump 1 (M3m1), connect adaptor (045) and pressure gauge (043). Ignition: ON Read fuel pressure. Disconnect pressure gauge (043) and adaptor (045) and check for leaks. 1 - 3 bar Fuel pressure < 1 bar: Voltage at fuel pump 1 < 11 V, Replace fuel pump 1 (M3m1). Fuel pressure > 3 bar: Voltage at fuel pump 2 < 11 V, Replace fuel pump 2 (M3m2).