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Ford OBD I sistema de inyección electrónica8 junio 2010Autor: Alberto Quiroga

Aplicable al parque vehicular mexicano modelos 1989 a 1995 con computadora del sistema de inyección de 60 terminales.

Para estos modelos se podrán obtener códigos de falla de forma práctica sin escáner o a través de éste en las siguientes pruebas KOEO (Key On Engine Off-Llave en encendido, motor apagado), en esta prueba se obtienen códigos de falla tanto presentes como los almacenados en memoria.

a) Para accesar a la prueba de obtener códigos de falla, ubique el conector de diagnóstico que es normalmente de color negro y se localiza sobre la salpicadera delantera lado izquierdo o derecho en el compartimiento del motor.

b) Realice un puente en conector de diagnóstico en la terminal 2 y un cable de color blanco con rojo suelto junto al conector. Si éste no se encuentra fuera del conector puede estar en las cavidades del conector 1, 3 o 5, identificándolo por el color del cable.

Descripción de la falla: Dificultad en el arranque del motor, marcha mínima inestable, humo negro, la luz del Check Engine prendida y al intentar obtener códigos de falla de forma práctica la luz de Check permanece prendida y no destella.

Detección de la causa: Verificar con una lámpara de pruebas en la terminal 2 del conector de diagnóstico que tenga alimentación de tierra. Si no enciende puede presentar alguno de estos problemas:

a) Estar abierta la línea entre la computadora y el conector de diagnóstico.

b) Estar dañada la misma computadora en su control de tierra.

Solución: En algunos casos se puede sustituir la línea dañada con una tierra física. En ocasiones, la alimentación de tierra es muy tenue y también presenta falla el motor, en este caso también se puede reforzar con tierra física. En caso de no solucionarse de forma práctica, será necesario reparar la computadora.

Nota: Contra la creencia general de que una computadora o módulo dañado debe ser reemplazado necesariamente, nuestra experiencia reparándolos nos indica que muchos de ellos pueden ser reutilizados, ahorrándole dinero al cliente final y proporcionando un mejor servicio, permitiéndonos ser más competitivos en nuestros precios de reparaciones.

ord OBD1 Codes Retrieval for Pre-1996 Vehicles

Ford 1985-95 OBD1 code self-retrieval

When checking engine service light on Ford vehicles made before 1995, you can get the code yourself using a $5 tool called "test light". All you need is to hook it up to the vehicle’s diagnostic connector and turn your key on and watch the codes being flashed in your dash panel.

Shown above on your left how the FORD OBD1 diagnostic connector is set up.

You should find the diagnostic connector under your hood normally by the fender next to the battery on the passenger side of engine compartment. By just using your test light and a jumper wire, it will tell you what kind of Ford OBD1 code problem you got.

KEY ON ENGINE OFF (KOEO) TEST

1. Make sure engine is fully warmed. If in doubt, run engine at 2000 rpm for 2 minutes.2. Turn ignition off and wait 10 seconds for system to shut off. Make sure A/C is off and transmission is in Park (automatic) or Neutral (manual).3. Hook up light and jumper (or a tester if you have one). Turn key to ON (do not start engine). Read the codes.

How to do it?

Example code 23: your test light should flash 2 long consecutive flashes followed by 3 short pulses.

Ford's common OBD1 fault codes (for vehicles made before 1995)

11 system pass12 idle control fault13 dc motor did not move14 engine rpm signal fault or PIP circuit failure15 eec processor or power to KAM interrupted16 rpm to low to check oxygen sensor test or fuel control error17 cfi fuel control system fault or rich/lean condition indicated18 ignition diagnostic monitor

(IDM) circuit failure19 cylinder identification (CID) sensor input failure21 engine coolant temperature (ECT) out of self-test range22 manifold absolute pressure (MAP) sensor circuit out of range

23 throttle positioner sensor out of self-test range24 air charge temperature (ACT) sensor out of self-test range25 knock not sensed during dynamic response test26 transmission fluid temperature out of self-test range28 loss of primary tach, right side29 insufficient input from vehicle speed sensor31 egr positioner sensor below minimum voltage32 egr positioner sensor below closed limit33 throttle positioner sensor noisy/harsh on line34 egr valve circuit out of self-test range35 egr valve circuit above maximum voltage38 idle track switch circuit open39 axod torque converter or bypass clutch not applying properly41 oxygen sensor circuit indicates system always lean42 oxygen sensor circuit indicates system always rich43 oxygen sensor out of self-test range44 air injection control system failure45 coil 1 primary circuit failure46 coil primary circuit failure47 4X4 switch is closed or oxygen sensor failure48 coil primary circuit failure49 electronic transmission shift error51 engine coolant temperature sensor circuit open52 power steering pressure switch circuit open53 throttle position circuit above maximum voltage54 air charge temperature circuit open55 key power input to processor open circuit56 mass air flow circuit above maximum voltage57 axod circuit failure58 idle tracking switch circuit fault59 automatic transmission shift error61 engine coolant temperature circuit grounded62 converter clutch error63 throttle positioner circuit below minimum voltage64 air charge temperature circuit grounded65 charging system over voltage66 mass air flow sensor circuit below minimum voltage67 neutral/drive switch circuit open68 transmission fluid temperature over temperature range69 transmission shift error70 data circuit communication link circuit failure71 message center circuit circuit failure72 insufficient manifold absolute pressure (MAP) change during dynamic response test73 insufficient throttle positioner (TPS) change during dynamic response test74 brake on/off (BOO) circuit open75 brake on/off (BOO) circuit closed76 insufficient air flow output change during test77 brief wide open throttle not sensed during test78 power interrupt detected79 a/c on/defrost on during self test81 map has not changed normally82 super charger bypass circuit failure83 OIC-low speed fuel pump relay circuit failure84 egr vacuum regulator (EVR) circuit failure85 canister purge circuit failure86 shift solenoid circuit failure87 fuel pump circuit failure88 electro drive fan circuit failure89 transmission solenoid circuit failure

91 no oxygen sensor switching detected92 shift solenoid circuit failure93 throttle positioner sensor input low94 torque converter clutch solenoid circuit failure95 fuel pump secondary circuit failure96 fuel pump secondary circuit failure97 transmission indicator circuit failure98 electronic pressure control circuit failure99 eec has not learned to control idle

If you get any of the above Ford 1983-1995 OBD1 Decoder fault codes,make sure to reset the code before making any repairs. If the code is permanent, it will come back once you scan the code again. You can then proceed in repairingthe fault code/s using the following methods:

1.) using common fixes available when you ask your Ford parts store or service department.2.) using wiring diagram for the Ford vehicle you are working

The same solution applies when checking Ford OBD2 codes but this time, you need ascanner to get the code. Shown below are some examples of Ford OBD2 fixes whichcan be used for your vehicles:

 

 

Ford Data Link Connector Code Gathering ModeStep 2 - Turn the key to the" ON" position this will initiate the code gathering sequence which be produced in the form of two digits.

Step 3 - The test light will begin to flash on, then off, when the flashing stops the first digit is complete, the system will then pause, and the second digit will begin. Example: Test light flashes twice, and pauses, then flashes six more times the code number is 26.Step 4 - Once repairs have been made, to clear system, simply remove the negative battery cable for thirty seconds and reconnect.Codes for OBD1 (Before 1996)11 - System pass12 - Idle control fault13 - DC motor did not move14 - engine rpm signal fault or PIP circuit failure15 - EEC processor or power to KAM interrupted16 - rpm to low to check oxygen sensor test or fuel control error17 - CFI fuel control system fault or rich/lean condition indicated18 - Ignition diagnostic monitor (IDM) circuit failure19 - Cylinder identification (CID) sensor input failure21 - Engine coolant temperature (ECT) out of self-test range22 - Manifold absolute pressure (MAP) sensor circuit out of range23 - Throttle position sensor out of self-test range24 - Air charge temperature (ACT) sensor out of self-test range25 - Knock not sensed during dynamic response test26 - Transmission fluid temperature out of self-test range28 - Loss of primary tach, right side29 - Insufficient input from vehicle speed sensor31 - EGR position sensor below minimum voltage32 - EGR position sensor below closed limit33 - Throttle position sensor noisy/harsh on line34 - EGR valve circuit out of self-test range35 - EGR valve circuit above maximum voltage38 - Idle track switch circuit open39 - AXOD torque converter or bypass clutch not applying properly41 - Oxygen sensor circuit indicates system always lean42 - Oxygen sensor circuit indicates system always rich43 - Oxygen sensor out of self-test range44 - Air injection control system failure45 - Coil 1 primary circuit failure46 - Coil primary circuit failure47  - 4X4 switch is closed or oxygen sensor failure48 - Coil primary circuit failure49 - Electronic transmission shift error51 - Engine coolant temperature sensor circuit open52 - Power steering pressure switch circuit open53 - Throttle position circuit above maximum voltage54 - Air charge temperature circuit open55 - Key power input to processor open circuit56 - Mass air flow circuit above maximum voltage57 - AXOD circuit failure58 - Idle tracking switch circuit fault59 - Automatic transmission shift error61 - Engine coolant temperature circuit grounded

62 - Converter clutch error63 - Throttle position circuit below minimum voltage64 - Air charge temperature circuit grounded65 - Charging system over voltage66 - Mass air flow sensor circuit below minimum voltage67 - Neutral/drive switch circuit open68 - Transmission fluid temperature over temperature transmission shift error70 - Data circuit communication link circuit failure71 - Message center circuit circuit failure72 - Insufficient manifold absolute pressure (MAP) change during dynamic response test73 - Insufficient throttle position (TPS) change during dynamic response test74 - Brake on/off (BOO) circuit open75 - Brake on/off (BOO) circuit closed76 - Insufficient air flow output change during test77 - Brief wide open throttle not sensed during test78 - Power interrupt detected79 - A/C on/defrost on during self test81 - Map has not changed normally82 - Super charger bypass circuit failure83 - OIC-low speed fuel pump relay circuit failure84 - EGR vacuum regulator (EVR) circuit failure85 - Canister purge circuit failure86 - Shift solenoid circuit failure87 - Fuel pump circuit failure88 - Electro drive fan circuit failure89 - Transmission solenoid circuit failure91 - No oxygen sensor switching detected92 - Shift solenoid circuit failure93 - Throttle position sensor input low94 - Torque converter clutch solenoid circuit failure95 - Fuel pump secondary circuit failure96 - Fuel pump secondary circuit failure97 - Transmission indicator circuit failure98 - Electronic pressure control circuit failure99 - EEC has not learned to control idle