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Fuel Charging and Controls The fuel charging and controls system consists of: fuel pressure regulator (9C968) fuel injection supply manifold (9F792) fuel injectors (9F593) fuel shut off valve solenoid (9D278) fuel pressure relief valve (9H321) injection pressure sensor engine fuel temperature sensor fuel charging wiring harness Component Location Fuel Pressure Regulator The fuel pressure regulator is located on the inside of the LH frame rail just forward of the transmission support crossmember. It is part of an assembly that includes the coalescer/filter. The fuel pressure regulator reduces the line pressure from tank pressure 20685 kPa (3000 psi) to line pressure 655 kPa (95 psi). Heating/Defrosting—Natural Gas Vehicle Fuel pressure regulator heating is provided by two 3/8-inch taps from the existing heater supply and return hoses on the RH rear of the engine. Two high-temperature 3/8-inch ID heater hoses (packaged with the front low-pressure fuel line) are used to connect the fuel pressure regulator to the tap points on the engine heater hoses. Refer to the Line — Low Pressure Fuel procedure in Section 310-01B for fuel pressure regulator heater hose replacement. Fuel Pressure Regulator Heater Hoses Fuel Injection Supply Manifold The fuel injection supply manifold delivers high-pressure fuel from the vehicle fuel supply line to the fuel injectors. The fuel injection supply manifold consists of the following: a tubular fuel rail eight fuel injector connectors a fuel pressure relief valve a fuel shut off valve solenoid mounting attachments which locate the fuel injection supply manifold and provide fuel injector retention. a fuel inlet connection which has a push-connect fitting an injection pressure sensor an engine fuel temperature sensor Fuel Injection Supply Manifold Fuel Injectors The natural gas fuel injectors are electro-mechanical devices that meter fuel delivered to the engine. The natural gas fuel injectors are mounted in the lower intake manifold (9424) and are positioned so that their tips direct fuel just ahead of the engine intake valves (6507). The natural gas fuel injector bodies consist of a solenoid and a needle and valve assembly. Natural gas fuel injectors can be identified by an aqua cap on the injector body. Fuel Shutoff Valve Solenoid The fuel shut off valve solenoid seals the upstream fuel pressure from entering the fuel injection supply manifold when the engine is not running. The fuel shut off valve solenoid is open only when it is activated by the solenoid valve (fuel pump) relay. Fuel Pressure Relief Valve The fuel pressure relief valve is located on the fuel injection supply manifold, and is used to relieve fuel system pressure from the fuel delivery system. Injection Pressure Sensor The injection pressure sensor is located on the fuel injection supply manifold, and is used to provide a signal to the powertrain control module (PCM) (12A650) that is proportional to pressure in the fuel injection supply manifold. Engine Fuel Temperature Sensor The engine fuel temperature sensor is located on the fuel injection supply manifold, and is used to provide a signal to the powertrain control module that indicates the temperature of the fuel in the fuel injection supply manifold. Fuel Charging Wiring The fuel charging wiring is a single harness that includes electrical connectors for the fuel injectors, ignition coils and various sensors, valves and senders that monitor all engine functions. Fuel Charging Wiring

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1. Remove the torque converter clutch (TCC) solenoid and the shift solenoid. 1. Remove the retaining bolt. 2. Remove the shift solenoid. 3. Remove the TCC solenoid. 2. Remove the 2 reinforcement plates. 1. Remove the bolts. 2. Remove the plates. 3. Remove the separator plate and discard the gaskets. 4. NOTE: Note the location of the eight coasting booster valve shuttle balls for assembly. Remove the 8 coasting booster valve shuttle balls. 5. Remove the converter drain back valve and solenoid pressure supply screen. 6. Remove the main control valve body cover plate. 1. Remove the 13 main control valve body cover plate bolts. 2. Remove the main control valve body cover plate. Assembly NOTE: Inspect the shift solenoid O-rings and TCC solenoid O-rings for damage. 1. Install the valve body cover plate. 1. Position the valve body cover plate gasket and cover plate. 2. Loosely install the 2 guide pin bolts. 3. Loosely install the remaining bolts. 2. Tighten all the bolts in the sequence shown. 3. Install the 8 coasting booster valve shuttle balls.

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1. If equipped, turn the air suspension switch OFF. 2. Disconnect battery ground cable. 3. Raise and support the vehicle; refer to Section 100-02. 4. Drain transmission fluid and remove the transmission fluid pan and filter; refer to Transmission Fluid Drain and Refill in this section. 5. CAUTION: Do not pull on the plastic lead frame. This may cause damage to the connector ends. Carefully pry up on the locking tabs to disconnect the sensors. Disconnect the molded lead frame from the sensors. Disconnect the molded lead frame from the sensors. 1. Disconnect the shift solenoid SSA/SS1 and SSB/SS2. 2. Disconnect the torque converter clutch (TCC). 3. Disconnect the electronic pressure control (EPC) solenoid. 4. Disconnect the bulkhead inter connector. 6. Remove the shift solenoid and the torque converter clutch (TCC) solenoid. 1. Remove the bolts. 2. Remove the shift solenoid and the torque converter clutch (TCC) solenoid. 7. Remove the manual control valve detent lever spring (7A261) 1. Remove the bolt. 2. Remove the manual control valve detent lever spring 8. Remove the 23 valve body to case bolts. 9. Remove the main control valve body (7A100) Installation 1. NOTE: Make sure that the drive pin of the manual valve detent lever assembly engages the manual valve in the proper location prior to installing the bolts. Position the main control valve body gasket and main control valve body using the two alignment bolts as a guide. 2. NOTE: The main control valve body bolts will be tightened in later steps. Loosely install the bolts. 3. NOTE: The main control valve body bolts will be tightened in later steps. Loosely install the bolts. 4. Install the manual control valve detent lever spring. 1. Position the manual control valve detent lever spring. 2. Install the bolt.

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FUEL PRESSURE RELEASE Fuel Rail With Fuel Pressure Test Port 1. Disconnect negative battery cable. Remove fuel tank cap to release fuel tank pressure. 2. Remove protective cap from fuel pressure test port on fuel rail. Place one end of Fuel Pressure Gauge (5069) hose into approved gasoline container. Screw remaining end of fuel pressure gauge hose onto fuel pressure test port. Fuel pressure will be released into gasoline container. 3. After fuel pressure is released, remove fuel pressure gauge hose from fuel pressure test port. Reinstall protective cap on fuel pressure test port and fuel tank cap. Reinstall negative battery cable. Fuel Rail Without Fuel Pressure Test Port 1. Remove fuel pump relay from Power Distribution Center (PDC), located near windshield washer reservoir. Refer to label on PDC cover for relay location. 2. Start engine and allow to idle until engine stalls. Attempt to start engine several times. Once engine will not restart, turn ignition off. 3. Disconnect electrical connector from any fuel injector. Connect a jumper wire between one fuel injector terminal and positive battery terminal. Connect another jumper wire to remaining fuel injector terminal. CAUTION: DO NOT apply battery voltage to fuel injector for more than 4 seconds, or fuel injector may be damaged. 4. Momentarily touch remaining end of jumper wire to negative battery terminal for no more than 4 seconds. Cover fuel line at fuel rail with shop towel before disconnecting. Disconnect fuel line. 5. Disconnect jumper wires. Reinstall electrical connector on fuel injector. Reinstall fuel pump relay. Diagnostic Trouble Codes (DTCs) may be stored in Powertrain Control Module (PCM) when ASD relay is removed. To clear DTCs from PCM, see TESTS W/CODES – 2.5L article. FUEL PRESSURE TEST

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DESCRIPTION The following vehicles share common transaxle Diagnostic Trouble Codes (DTC): • 1996-2005 Accent • 1996-2000 Elantra • 1997-2001 Tiburon Elantra and Tiburon vehicles produced beginning 6/1/99 and 2000-2005 Accent vehicles use a valve body with six solenoids and have several new DTCs. DTC information can be found in the shop manuals, TSBs and Engine Fault Code Diagnostic Manual (OBDII Manual) listed below: DTC P0501 Vehicle speed sensor range DESCRIPTION P0703 Stop lamp switch – Open/short P0705 Range switch signal problem P0707 Range switch – open circuit P0708 Range switch – short circuit P0710 A/T fluid temperature sensor P0711 A/T temperature sensor – rational- ity check DTC P0712 A/T temperature sensor signal – open/short P0713 A/T temperature sensor signal – open/short P0717 No pulse generator A signal P0722 No pulse generator B signal P0727 Engine speed signal – open circuit DESCRIPTION P0731 1st gear incorrect ratio P0732 2nd gear incorrect ratio P0733 3rd gear incorrect ratio P0734 4th gear incorrect ratio P0740 Torque converter clutch control system problem P0741 Damper clutch stuck off P0742 Damper clutch stuck on P0743 Damper clutch control solenoid valve – open/short P0745 Pressure control solenoid valve A – open/short, TR-9 P0747 Pressure control solenoid valve – open P0748 Pressure control solenoid valve – short P0750 Shift control solenoid valve A – open/short P0752 Shift control solenoid valve A – open P0753 Shift control solenoid valve A – short P0755 Shift control solenoid valve B – open/short P0757 Shift control solenoid valve B – open P0758 Shift control solenoid valve B – short