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1.2 HFM Sequential Multiport Fuel Injectin/Ignition System (HFM-SFI)   >   34 Electrical Test Program - Test

Test scope Test connection Test condition Nominal value Possible cause/Remedy 1) 1.0   Fuel pumps Delivery capacity 29 (1.29) N3/4 39 (1.39) Connect special tool fitting, part no. 000 589 01 91 00, and fuel hose to diaphragm pressure regulator instead of fuel return line. Place other end of fuel hose in measuring glass. Ignition: ON 1 liter after max. 35 seconds. Check fuel lines for restrictions (kinks and dents). Replace fuel filter, 2.0 , 3.0. 2.0   Fuel pumps Current draw Connected to sockets 1 and 3 (Figure 1).   Unplug FP relay module and connect Amperemeter to socket 1 and 3. Ignition: ON 5 - 9 A Fuel pump 1 or 2. Note: If current draw > 12 A, also replace FP relay module. 3.0   Fuel pressure after fuel pump 1 Only on vehicles with 2 fuel pumps 29 (1.29) N3/4 39 (1.39) 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). 1) Observe Preparation for Test, see 22 .