1996 Toyota Camry DX ENGINE PERFORMANCE Toyota Basic Diagnostic Procedures
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1 FUEL SYSTEM Basic diagnosis of fuel system should begin by checking fuel pump operation and fuel pressure. WARNING: ALWAYS release fuel pressure before disconnecting any fuel injection-related component. DO NOT allow fuel to contact engine or electrical components. FUEL PUMP OPERATION Electric fuel pump operation may be checked by using scan tester or by applying battery voltage to fuel pump. Checking Fuel Pump Operation Using Scan Tester 1. Remove cover (if equipped) and install scan tester on data link connector No. 3. See Fig. 1. Turn ignition on. DO NOT start engine. 2. Using scan tester manufacturer's instructions, activate fuel pump. Listen for fuel pump operating sound and feel for pressure in fuel inlet line near fuel filter. Turn ignition off. Remove scan tester. If fuel pump operates, check fuel pressure. See FUEL PRESSURE. 3. If fuel pump does not operate, EFI main relay, circuit opening relay or fuel pump relay (if used) may be defective. For relay application and explanation of relay operation, see FUEL PUMP CONTROL CIRCUIT. 4. If relays are okay, check wiring circuit and fuses. If fuel pump does not operate, check for defective fuel pump or defective fuel pump ground circuit. See appropriate wiring diagram in WIRING DIAGRAMS article. Checking Fuel Pump Operation By Applying Battery Voltage To Fuel Pump 1. Remove rear seat and cover plate on floor panel for access to electrical connector at fuel pump. 2. Disconnect electrical connector for fuel pump. Electrical connector for fuel pump is located near fuel pump. CAUTION: When applying battery voltage to fuel pump, DO NOT apply battery voltage for more than 10 seconds, or fuel pump may be damaged. 3. Connect battery voltage to specified terminals on fuel pump to activate fuel pump. See Tuesday, April 06, :13:53 9:14:00 AM Page Mitchell Repair Information Company, LLC.
2 Fig. 2. DO NOT apply battery voltage to fuel pump for more than 10 seconds. 4. Listen for fuel pump operating sound and feel for pressure in fuel line near fuel filter. If fuel pump operates, check fuel pressure. See FUEL PRESSURE. Disconnect battery voltage from fuel pump. 5. If fuel pump fails to operate, replace fuel pump. If fuel pump will not operate while trying to start engine, EFI main relay, circuit opening relay or fuel pump relay (if used) may be defective. For explanation of relay operation, see FUEL PUMP CONTROL CIRCUIT. 6. If relays are okay, check wiring circuit, fuses and fuel pump ground. See appropriate wiring diagram in WIRING DIAGRAMS article. Reinstall electrical connector and remaining components. Fig. 1: Installing Scan Tester Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. Tuesday, April 06, :13:53 AM Page Mitchell Repair Information Company, LLC.
3 Fig. 2: Identifying Fuel Pump Electrical Connector Terminals Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. FUEL PRESSURE All models use in-tank fuel pump. 1. Ensure battery is fully charged and ignition is off. Disconnect negative battery cable. 2. Note location for fuel pressure gauge installation. See Fig. 3. Fuel pressure gauge may be installed on fuel filter or on delivery pipe depending on model application. 3. Place container under fuel filter or delivery pipe. Cover union bolt with shop towel. Slowly loosen union bolt to release fuel pressure. 4. Remove union bolt and gaskets. Install Fuel Pressure Gauge (SST ) using NEW gaskets. See Fig. 3. Tighten union bolt. Reconnect negative battery cable. 5. Remove cover (if equipped) and install scan tester on data link connector No. 3. See Fig. 1. Turn ignition on. DO NOT start engine. 6. Using scan tester manufacturer's instructions, activate fuel pump and note fuel pressure. Fuel pressure should be within specification. See FUEL PUMP PERFORMANCE table. Fuel pump may also be activated by connecting battery voltage to specified terminals on fuel pump. See Fig. 2. Tuesday, April 06, :13:53 AM Page Mitchell Repair Information Company, LLC.
4 7. If fuel pressure exceeds specification, replace fuel pressure regulator, located on the delivery pipe. If fuel pressure is less than specified, check for defective fuel lines, connections, fuel pump, fuel filter, fuel pressure regulator or fuel pressure control Vacuum Switching Valve (VSV) if equipped. 8. Turn ignition off. Remove scan tester from data link connector No. 3. Reinstall cover (if equipped). Start engine and allow engine to idle. 9. Disconnect and plug vacuum line at fuel pressure regulator. Note fuel pressure. Fuel pressure should be within specification. See REGULATED FUEL PRESSURE table. 10. Reconnect vacuum hose on fuel pressure regulator and note fuel pressure with engine idling. Fuel pressure should be within specification. See REGULATED FUEL PRESSURE table. 11. If fuel pressure is not within specification, check for defective vacuum hose or fuel pressure regulator. Shut engine off and note fuel pressure. 12. Fuel pressure should hold at least 21 psi (1.5 kg/cm 2 ) for a minimum of 5 minutes. If fuel pressure does not hold as specified, check for defective fuel pump, fuel injector or fuel pressure regulator. 13. Disconnect negative battery cable. Remove fuel pressure gauge. Reinstall union bolt using NEW gaskets. Tighten union bolt. Install negative battery cable. Recheck for fuel leaks. Fig. 3: Installing Fuel Pressure Gauge Tuesday, April 06, :13:53 AM Page Mitchell Repair Information Company, LLC.
5 Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. For more information on checking fuel injectors and other fuel subsystems, see SYSTEM/COMPONENT TESTS article. FUEL PUMP PERFORMANCE Application Pressure psi (kg/cm 2 ) Camry (1) ( ) (1) Check fuel pressure with engine off and using scan tester connected to data link connector No. 3 with ignition on to activate fuel pump or by connecting battery voltage to terminals on fuel pump. REGULATED FUEL PRESSURE Application Type At Idle W/Vacuum psi At Idle W/O Vacuum psi Tested (kg/cm 2 ) (kg/cm 2 ) Camry ( ) ( ) FUEL PUMP CONTROL CIRCUIT For information on testing relays and fuel system components, see SYSTEM/COMPONENT TESTS article. Relays may be identified by appropriate illustration in THEORY/OPERATION - 2.2L article. Vehicles are equipped with different combinations of fuel system electrical components. For complete wiring circuit of electrical components on a specific model, see appropriate wiring diagram in the WIRING DIAGRAMS article. EFI Main Relay The EFI fuse supplies constant battery voltage to EFI main relay. When ignition is turned on, voltage is supplied through IGN fuse to EFI main relay. EFI main relay is then energized and provides battery voltage to circuit opening relay, data link connector No. 1 and various other electrical components. The EFI main relay also provides battery voltage to +B terminal of Engine Control Module (ECM) when ignition is turned on. The EFI main relay is located in engine compartment relay box. Circuit Opening Relay Circuit opening relay controls the fuel pump circuit. When EFI main relay is energized, EFI Tuesday, April 06, :13:53 AM Page Mitchell Repair Information Company, LLC.
6 main relay provides battery voltage to one side of circuit opening relay. When engine is cranking, circuit opening relay receives a start signal which energizes circuit opening relay. Circuit opening relay then provides voltage to fuel pump for fuel pump operation. When start signal is released from circuit opening relay and engine is running, the Engine Control Module (ECM) then uses engine speed input signal for controlling the ground circuit for circuit opening relay at ECM terminal FC. Circuit opening relay then provides voltage to fuel pump for fuel pump operation. Tuesday, April 06, :13:53 AM Page Mitchell Repair Information Company, LLC.
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