1999 Ford Taurus LX FLEX FUEL (FF) SENSOR Self-Diagnostics

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Filed Under (Ford) by admin on 17-03-2011

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TEST DE: FLEX FUEL (FF) SENSOR NOTE: After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC- V systems are working properly and DTCs are no longer present. Diagnostic Aids Perform this test only when directed by QUICK TEST. This system test is intended to diagnose the following components and circuits: Flex Fuel (FF) sensor. Wiring harness circuits (FFS SIG, VPWR and PWR GND). Powertrain Control Module (PCM). NOTE: Type of fuel vehicle uses can be identified by checking calibration sticker on left door jam. See FUEL TYPE IDENTIFICATION table. Fuel type can also be identified by checking label on fuel filler door. 1) DTC P0176: Check FF Sensor VPWR Circuit This DTC indicates failure in the FF sensor and/or circuit. Possible causes for this fault are: Faulty FF sensor. Open or shorted wiring harness circuits. Fuel separation or contamination. Faulty Powertrain Control Module (PCM). Turn ignition off. Disconnect FF sensor connector. Turn ignition on. Measure voltage between negative battery terminal and VPWR terminal at FF sensor wiring harness connector. See Fig. 71 . If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair VPWR circuit.

2001 Dodge Pickup R1500 LEAK DETECTION PUMP (LDP) OPERATION AND DIAGNOSIS

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Filed Under (Dodge) by admin on 29-12-2010

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The evaporative emission system is designed to prevent the escape of fuel vapors from the fuel system. Leaks in the system, even small ones, can allow fuel vapors to escape into the atmosphere. Government regulations require onboard testing to make sure that the evaporative (EVAP) system is functioning properly. The leak detection system tests for EVAP system leaks and blockage. It also performs self-diagnostics. During self-diagnostics, the Powertrain Control Module (PCM) first checks the Leak Detection Pump (LDP) for electrical and mechanical faults. If the first checks pass, the PCM then uses the LDP to seal the vent valve and pump air into the system to pressurize it. If a leak is present, the PCM will continue pumping the LDP to replace the air that leaks out. The PCM determines the size of the leak based on how fast/long it must pump the LDP as it tries to maintain pressure in the system. EVAP LEAK DETECTION SYSTEM COMPONENTS (FIGURE 1) Service Port : Used with special tools like the Miller Evaporative Emissions Leak Detector (EELD) to test for leaks in the system. EVAP Purge Solenoid : The PCM uses the EVAP purge solenoid to control purging of excess fuel vapors stored in the EVAP canister. It remains closed during leak testing to prevent loss of pressure. EVAP Canister : The EVAP canister stores fuel vapors from the fuel tank for purging.

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1995 Honda Accord LX TROUBLE SHOOTING ANTI-LOCK (ABS) WARNING LIGHT

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Filed Under (Honda) by admin on 15-12-2010

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NOTE: Diagnostic Trouble Code (DTC) Recognition 1. ABS control unit recognizes system related problems and causes ABS warning light to come on and stay on under any of following conditions: Vehicle is driven with parking brake on longer than 30 seconds. One rear wheel is locked. Wheel speed sensor does not transmit a signal. Vehicle is driven on extremely rough road. Low battery voltage. Operation time of solenoid valves exceeds a specified value and control unit indicates an open circuit in solenoid circuit. Output signals from control unit are not transmitted to solenoid valves. Temporary loss of traction due to excessive cornering speed or starting from stuck condition (mud, snow or sand). 2. If ABS warning light comes on intermittently, use ABS Tester (07HAJ-SG0010B) to confirm problem. See ABS FUNCTION TEST under DIAGNOSIS & TESTING. 3. ABS warning light comes on and trouble code is stored in control unit when insufficient battery voltage exists at control unit. If low battery voltage caused problem, recharge battery and clear trouble code(s). See CLEARING DTCs under SELF-DIAGNOSTICS. ABS Warning Light Does Not Come On If ABS warning light does not come on when ignition is on: Check bulb. Check Yellow wire between fuse No. 1 and instrument cluster. Check Blue/White wire between instrument cluster and control unit. Check control unit ground circuit. ABS Warning Light Stays On Without DTCs If ABS warning light stays on and no DTCs have been stored in control unit, check for following items: Loose or poor control unit connector. Blown ABS fuse No. B2 in underhood fuse/relay box. Open circuit in White/Black wire between ABS fuse No. B2 and control unit. Open circuit in Yellow/Black wire between fuse No. 7 and fail-safe relays. ABS system is okay if ABS warning light goes out after engine is started.

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2001 Mazda MPV DX ENGINE PERFORMANCE Self-Diagnostics

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Filed Under (Mazda) by admin on 15-11-2010

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DTC P1518: IMRC SHUTTER VALVE STUCK OPEN Condition PCM monitors intake manifold runner control (IMRC) circuit voltage. DTC is set when PCM terminal No. 3 voltage is less than 1.6 volt for 3.2 seconds when IMRC valve changes from open to closed position. Possible causes are: Short to ground in wiring between IMRC harness connector terminal No. 1 (Black/Red wire) and PCM harness connector terminal No. 42 (Black/Yellow wire) or between IMRC harness connector terminal No. 5 (Black/Blue wire) and PCM harness connector terminal No. 3 (Red wire). Connector or terminal malfunction. IMRC malfunction. PCM malfunction. Testing NOTE: 1. Using scan tool, clear DTC. Ensure transmission is in Park. Turn ignition off. Start engine. Accelerate engine to more than 4000 RPM for 5 seconds. Allow engine to idle. Recheck DTCs. If DTC P1518 is pending, go to next step. If DTC P1518 is not pending, problem is intermittent. See TROUBLE SHOOTING – NO CODES article. Record freeze frame data. Check for service bulletins and on-line information.

2003 Ford Expedition Self-Diagnostics – CNG, Flex-Fuel & Gasoline

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Filed Under (Ford) by admin on 11-11-2010

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TEST HB: NATURAL GAS FUEL DELIVERY SYSTEM NOTE: After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC- V systems are working properly and DTCs are no longer present. Diagnostic Aids Perform this test when directed by QUICK TEST or if directed by other test procedures. This test is used to diagnose: Fuel Pressure Fuel Supply Lines Fuel Filter Fuel Injector(s) Fuel Pressure Regulator Fuel Injection Supply Manifold (Fuel Rail) Fuel Rail Solenoid Shutoff Valve(s) NOTE: Fuel rail solenoid shutoff valve is also referred to as low pressure solenoid shutoff valve. Fuel tank solenoid shutoff valve is also referred to as fuel tank solenoid valve.