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1991 Subaru Legacy Sedan 2WD F4-2.2L SOHC Fuel Pump Circuit Diagnostic Chart

May 16th, 2010 · No Comments

CHECK FUEL PUMP OPERATION IN “D-CHECK” MODE
1. Connect “Test Mode” connector. [1]
2. Turn ignition “ON.”
3. Check fuel pump for proper operation. Fuel pump should cycle on and off. [1]
Refer to “How To Display and Read Diagnostic Trouble Codes” in COMPUTERS AND CONTROL SYSTEMS.
CHECK FUEL PUMP RELAY
1. Disconnect relay connector and remove relay from its bracket.
2. Measure resistance of relay coil between terminals #1 and #3. It should read 70
Ohms.
3. Connect 12V to relay coil terminals and check continuity between switching
terminals. Connect battery “+” to terminal #1 and battery “-” to terminal #3. Relay
CHECK FUEL PUMP RELAY VOLTAGE
With relay connector attached, measure voltage between relay connector terminal
(B30)1 and ground. It should read 10V minimum .
CHECK ECU VOLTAGE
Check ECU voltage with ignition “ON” and also while cranking engine:

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