Auto Repair Manual Free Download and ReviewsFree download ebook pdf files automotive manual

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Terminal number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 (CHK) 23 24 (IGN) 25 26 27 28 29 30 31 32 *33 *34 *35 36 37 *38 39 *40 *41 42 43 44 45 46 47 48 49 50 51 Description Ign signal (power transistor) Cyl #1 Ign signal (power transistor) Cyl #5 Ign signal (power transistor) Cyl #3 ECM & IGN coil relay control signal Tachometer drive signal – Ign signal (power transistor) Cyl #6 Ign signal (power transistor) Cyl #2 Ign signal (power transistor) Cyl #4 – AAC valve control signal – Fuel pump relay control signal Air conditioner control signal – - Malfunction indicator lamp – - Ignition switch (START) signal Air conditioner switch signal Check (Diagnosis start) Throttle position sensor signal Ignition switch (IGN) signal Control unit ground Power steering oil pressure switch signal – SB (select bit) 1 signal [RB25DET A/T] Vehicle speed sensor signal (Vehicle speed sensor 2) Headlamp switch signal; Ignition power supply Control unit ground Idle position switch signal “1″ position switch signal “2″ position switch signal – Throttle opening signal [RB25DE-4WD M/T, RB25DE A/T, RB25DET] “0″ position switch signal Neutral signal (Park/neutral position signal) “R” position switch signal Full switch signal – Sensor ground Crankshaft position sensor 120? (REF) signal Crankshaft position sensor 120? (REF) signal Crankshaft position sensor 1? (POS) signal Ring gear crankshaft position sensor signal [RB20DE (L/B)] Turbo pressure sensor signal [RB25DET] Power supply for throttle position sensor, refrigerant pressure sensor, and turbo pressure sensor Rear defogger switch signal Heated oxygen sensor signal Fuel pump terminal voltage control output signal [RB25DET] Injector No. 6 cylinder drive signal Line pressure solenoid valve control signal (Dropping resistor Throttle motor sensor signal [RB25DET] *113 circuit)

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NOTE: 1. Release fuel pressure. See FUEL SYSTEM PRESSURE RELEASE . Install a fuel pressure gauge between fuel pressure regulator and fuel distributor pipe. See Fig. 1 . Bleed air from fuel line going to pressure gauge. 2. Unplug fuel pressure regulator Vacuum Switching Valve (VSV) connector on right side fender skirt. This is a 4-wire connector with Black and Blue wires in harness. PCM controls VSV to cut vacuum to fuel pressure regulator during hot engine starts. 3. Start engine and measure fuel pressure at idle. Disconnect fuel pressure regulator vacuum hose. Note fuel pressure at idle with vacuum hose disconnected (no vacuum). Fuel pressure should be 42 psi (3.0 kg/cm2 ). See FUEL PUMP PERFORMANCE . 4. If fuel pump pressure is low, check for fuel leaks, restrictions in intake side of fuel pump, leaking injectors, faulty pressure regulator or faulty fuel pump. If fuel pressure is high, check for restrictions in return line to tank or faulty pressure regulator. If pressure does not change when pressure regulator is disconnected, replace pressure regulator. 5. Reconnect pressure regulator vacuum hose and check fuel pressure (with vacuum). Fuel pressure should be 35 psi (2.4 kg/cm2 ). Apply battery voltage to VSV connector Blue wire terminal, and ground Black wire terminal (with vacuum). See Fig. 2 . Fuel pressure gauge should read about 42 psi (3.0 kg/cm2 ). If fuel pressure is not within specification, check for defective VSV. 6. Disconnect and plug vacuum hose from fuel pressure regulator. Stop engine and ensure fuel pressure remains greater than 35 psi (2.4 kg/cm2 ) for 4 minutes after engine stops. 7. If pressure drops, check for leaking injectors, faulty pressure regulator or bad check valve in fuel pump. If engine does not start, by-pass fuel pump relay to check for fuel pressure. Remove fuel pump relay from underhood fuse/relay box. Connect a fused jumper wire between terminals No. 1 and 3 of fuel pump relay connector in fuse block. See Fig. 3 and Fig. 4 . 8. If fuel pump does not operate, check for battery voltage to terminal No. 3. If battery voltage is present, check for open in fuel pump circuit. If fuel pump operates with jumper wire installed, check fuel pump relay and relay energizing circuit. Repair as necessary. Begin basic fuel system diagnosis with testing fuel pressure.

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FUEL SYSTEM PRESSURE RELEASE NOTE: 1. Loosen fuel tank filler cap to relieve tank pressure. Remove fuel pump relay from underhood fuse/relay box. Start and operate engine until it stalls. Crank engine an additional 30 seconds. 2. Loosen hose clamp of fuel line on side of pressure regulator, coming from fuel line inlet distributor pipe. Cover fuel hose with a shop towel, and slowly pull hose from pressure regulator to relieve fuel pressure. When fuel stops leaking, reinstall hose and clamp. FUEL PRESSURE & FUEL PUMP RELAY TEST NOTE: Fuel Pressure 1. Relieve fuel pressure. See FUEL SYSTEM PRESSURE RELEASE . Attach Fuel Pressure Gauge Set (J-34730-1 ) and Adapter (J-35957-1 ) to Schrader fitting on fuel rail. Disconnect pressure regulator vacuum hose. Turn ignition on. Allow fuel pump to run for about 2 seconds. 2. Fuel system pressure should be about 41-46 psi (2.8-3.2 kg/cm2 ). See FUEL PUMP PERFORMANCE . Start engine and check for leaks. Connect pressure regulator vacuum hose. If engine will not start, the fuel pump relay can be by-passed. Also see appropriate CHART A-3 – ENGINE CRANKS BUT WILL NOT RUN under TROUBLE SHOOTING CHARTS. With engine idling, fuel pressure should be 25-30 psi (1.8-2.1 kg/cm2 ). NOTE: Fuel pump relay is located in engine compartment fuse/relay box. Begin basic fuel system diagnosis with testing fuel pressure. To test the fuel pump relay circuit, proceed to CHART A-5 – FUEL PUMP RELAY CIRCUIT under TROUBLE SHOOTING CHARTS. Fuel Pump Relay 1. ECM supplies power to relay as long as ECM receives ignition reference signals or starter crank signal. To run fuel pump without starting engine, remove relay and jumper terminals No. 2 and 4. See Fig. 5 and Fig. 6 . 2. To test relay, use jumper wires to ground terminal No. 4 of relay and apply battery voltage to terminal No. 2 of relay. Using ohmmeter, check for continuity between relay terminals No. 1 and 3. If continuity is not present, replace relay.

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1. Remove fuel pump relay from power distribution center at driver’s side front corner of engine compartment, near the battery. Note terminal identification on fuel pump relay. See Fig. 6 . 2. To check fuel pump relay resistance, use ohmmeter and check resistance between terminals No. 85 and 86 on fuel pump relay. Replace fuel pump relay if resistance is not 70-80 ohms. 3. To check fuel pump relay operation, connect ohmmeter between terminals No. 30 and 87A on fuel pump relay. See Fig. 6 . Ohmmeter should indicate continuity between terminals No. 30 and 87A on fuel pump relay. 4. Connect ohmmeter between terminals No. 30 and 87 on fuel pump relay. See Fig. 6 . Ohmmeter should indicate no continuity between terminals No. 30 and 87 on fuel pump relay. CAUTION: DO NOT allow ohmmeter leads to contact terminals No. 85 and 86 on fuel pump relay when fuel pump relay is energized. 5. Connect 16-gauge jumper wire between negative battery terminal and terminal No. 85 on fuel pump relay. Connect 16-gauge jumper wire between positive battery terminal and terminal No. 86 on fuel pump relay. 6. Fuel pump relay should now be energized. No continuity should now exist between terminals No. 30 and 87A on fuel pump relay. Continuity should now exist between terminals No. 30 and 87 on fuel pump relay. Disconnect jumper wires. Replace fuel pump relay if defective. 7. If fuel pump relay or wiring circuit failure exists, a Diagnostic Trouble Code (DTC) will be stored in Powertrain Control Module (PCM). See appropriate G – TESTS W/CODES article.

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When the key is first turned ON, without the engine running, the ECM will turn the fuel pump relay ON for two seconds. This builds up the fuel pressure to normal operating pressure. If the engine is not started within two seconds, the ECM will shut the fuel pump OFF and wait until ignition reference pulses are present. As soon as the engine is cranked, the ECM turns the relay ON, which powers the fuel pump. The ECM continues to power the fuel pump during engine operation. If the fuel pump relay fails, it is backed up by the oil pressure switch, which continues to operate the fuel pump as long as oil pressure remains above 28.0 kPa (4 psi). A faulty fuel pump relay can result in long cranking times, particularly if the engine is cold. An inoperative fuel pump would cause a no start condition. A fuel pump which does not provide enough pressure can result in poor performance.