The Bosch LH 2.4 Jetronic System is used on the models (and later non-turbo/non-odbii models)
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- Bartholomew Casey
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1 The Bosch LH 2.4 Jetronic System is used on the models (and later non-turbo/non-odbii models) No faults Control unit fault Fuel injectors - Injector cable break or blocked injector; Heated Oxygen sensor max. enrichment sensed Injector # No signal to or from air mass meter. Engine runs in limp-home mode Air temp sensor signal No signal from coolant temperature sensor, or short to ground. Engine behaves as thought hot Injector # Ignition system RPM signal missing Battery voltage to low or high Throttle switch idle position incorrectly adjusted or shorted to ground Injector # Control unit fault. Engine running in limp-home mode with safety-retarded ignition (10 ) Knock sensor signal missing or defective. Engine running in limp-home mode with safety-retarded ignition (10 ) Fuel system load signal is absent or defective (air mass meter). Unit selects full-load timing and runs in limp-home mode Injector # Rear heated Oxygen sensor signal EGR system-leakage or excessive flow Injector # Oxygen sensor (Lambdasond) signal missing (front sensor on 1994 and later models) Throttle switch in full load position, shorted to ground Ignition RPM signal erratic (sensor faulty) Adaptive Lambda control, lean, part load; also heated Oxygen Sensor (Lambdasond), rich mixture / part load Main relay No signal to or from idle control valve Coolant temperature sensor faulty. Engine behaves as thought hot and runs in limp-home mode A/C pressure sensor signal Adaptive Lambda control, lean or rich / part load Adaptive Lambda control, lean or rich, part load; Heated Oxygen sesnor(lean mixture/part throttle) Adaptive Lambda control, lean or rich / idle; Adaptive heated Oxygen sensor control Idle control valve, closed or leaking Throttle switch (idling) signal missing. Engine running with safety-retarded ignition (10 ) Exhaust gas recirculation (EGR) malfunction. Not applicable to B234F Idle air control valve-closing signal No signal from speedometer No knock enrichment signal from ignition system Camshaft position signal missing or defective EVAP emission control system Cold start valve-signal missing Air mass meter platinum wire burn-off function defective Camshaft position siganl erratic ECU memory failure TCM request for MIL.
2 4-1-1 Throttle switch signal faulty or missing EGR temperature sensor signal incorrect or missing. Not applicable to B234F Turbo boost regulation Turbo boost reduction from TCM Temp warning level # EGR temp sensor faulty or missing High temp warning inside ECU No rear knock sensor signal Front heated oxygen sensor - slow response Rear heated oxygen sensor compensation Catalytic converter efficiency Acceleration sensor signal Misfire - #1 cylinder Misfire - #2 cylinder Misfire - #3 cylinder Misfire - #4 cylinder Misfire - #5 cylinder Adaptive oxygen sensor control-lean mixture at idle Oxygen integrator at max lean running limit High temp warning inside ECU Engine cooling fan-low speed signal faulty Oxygen sensor preheating-front Oxygen sensor preheating- rear Power stage-group A Power stage-group B Power stage- group C Power stage- group C TC control valve signal EVAP valve signal Misfire - more than one cylinder Misfire - at least one cylinder Misfire - more than one cylinder/catalytic converter damage Misfire - at least one cylinder/catalytic converter damage Misfire - #1 cylinder/catalytic converter damage Misfire - #2 cylinder/catalytic converter damage Misfire - #3 cylinder/catalytic converter damage Misfire - #4 cylinder/catalytic converter damage Misfire - #5 cylinder/catalytic converter damage.
3 The FENIX 5.2 System is used on the 10 valve non turbo No faults ECU faulty Fuel injectors; From 1994 and later, Heated oxygen sensor max. enrichment sensed short term fuel mixture too weak Injector no. 1 cylinder faulty signal Manifold Absolute Pressure (MAP) signal absent or faulty Air Temperature sensor signal absent or faulty Coolant temperature sensor signal absent or faulty Injector no. 2 cylinder faulty signal Ignition System RPM signal Battery voltage too low/high Throttle switch signal (idle) Injector no. 3 falty signal ECU faulty Front knock sensor signal missing or sensor defective Fuel system load signal (missing or defective) Injector no. 4 cylinder faulty signal Air pump valve signal absent or faulty (only on some emission controlled vehicles) Rear heated oxygen sensor signal EGR system - leakage or excessive flow Injector no. 5 cylinder faulty signal Heated Oxygen sensor signal (front sensor on 1994 and later models) absent or faulty Throttle switch signal (wide-open) Ignition rpm sensor signal erratic, absent or faulty Lambda Operation; Also heated Oxygen sensor (rich mixture/part throttle) / long term fuel mixture too weak in part load Main relay signal absent or faulty Idle air control valve signal absent or faulty Coolant temperature sensor signal A/C pressure sensor signal absent or faulty Lambda adjustment; Also heated Oxygen sensor (lean mixture / part throttle) / long term fuel mixture too rich in part load Lambda adjustment; adaptive heated oxygen sensor control / long term fuel mixture too weak at idle Idle valve - closed or intake air leak / long term idle air trim outside control range Throttle switch signal missing EGR malfunction Idle air control valve - closing signal Speedometer signal Knock/Fuel enrichment signal missing Camshft position sensor signal missing or defective EVAP emission control system Cold start valve - signal missing Airflow meter hot wire Camshaft position sensor signal erratic ECU memory failure TCM request for MIL (CHECK ENGINE light) Throttle switch signal faulty or missing
4 4-1-3 EGR temperature sensor signal incorrect or missing Turbo boost regulation Turbo boost reduction from TCM Temperature warning level no EGR temperature sensor faulty or missing High temperature warning inside ECU No rear knock sensor signal Front heated oxygen sensor - slow response Rear heated oxygen sensor compensation Catalytic converter efficiency Acceleration sensor signal Misfire cylinder no Misfire cylinder no Misfire cylinder no Misfire cylinder no Misfire cylinder no Adaptive oxygen sensor control, provides leaner mixture at idle Oxygen intergrator at maximum lean running limit High temperature warning inside ECU Engine cooling fan - low speed signal faulty Oxygen sensor preheating front Oxygen sensor preheating rear Power stage - group A Power stage - group B Power stage - group C Power stage - group D TC control valve signal EVAP valve signal Misfire on more than one cylinder Misfire on at least one cylinder Misfire on more than one cylinder, catalyic converter damage Misfire on at least one cylinder, catalyic converter damage Misfire on cylinder no. 1, catalyic converter damage Misfire on cylinder no. 2, catalyic converter damage Misfire on cylinder no. 3, catalyic converter damage Misfire on cylinder no. 4, catalyic converter damage Misfire on cylinder no. 5, catalyic converter damage
5 The Motronic 4.3 System is used on the 20 valve turbocharged and some non-turbo 20 valve B5254S engines ECU faulty Injector no. 1 cylinder faulty signal MAF signal absent or faulty Coolant temperature sensor signal absent or faulty Injector no. 2 cylinder faulty signal Ignition System RPM signal absent or faulty Battery voltage too low/high Injector no. 3 faulty signal Front knock sensor signal missing or sensor defective Fuel system load signal (missing or defective) Injector no. 4 cylinder faulty signal Air pump valve signal absent or faulty (on certain engines) EGR system - leakage or excessive flow (on certain engines) Injector no. 5 cylinder faulty signal Heated oxygen Sensor Signal absent or faulty Ignition rpm sensor signal intermittently absent Idle air control valve signal absent or faulty A/C pressure sensor signal absent or faulty Long term fuel mixture too lean or rich in part load stage Long term fuel mixture too lean or rich at idle Long term idle air trim outside control range EGR controller signal absent/faulty (on certain engines) EGR flow fault (on certain engines) Throttle position sensor signal voltage incorrect (out of range) Knock control at limit Idle air control valve closing signal faulty/absent Speedo signal missing EVAP valve signal absent/faulty (on certain engines) Camshft position sensor signal missing or defective EVAP emission control system fault (on certain engines) Malfunction indicator lamp signal faulty ECU memory failure Request for Malfunction indicator lamp signal from auto transmission ECU Airconditioning relay control signal fault fuel pump relay control signal fault Throttle position sensor signal not within correct voltage EGR temperature sensor signal incorrect or missing (on certain engines) Turbo boost pressure too high Turbo boost reduction from auto transmission ECU(/TCM) High temperature warning inside ECU Rear knock sensor signal absent/faulty Heated oxygen sensor - slow response Air pump relay signal absent/faulty (on certain engines)
6 5-1-1 Long term fuel mix too idle Short term fuel mix too idle High temperature warning inside ECU Engine cooling fan at low speed faulty Engine cooling fan at high speed faulty Oxygen sensor heating fault Signal to ECU module box cooling fan shorted to 12 volts Fault in transmission torque control signal Turbo regulator valve fault EVAP valve signal fault (on certain engines) The Bosch LH 3.2 Jetronic system is used on the 20 valve non-turbocharged except some B5254S engines using Motronic No faults ECU faulty Short term fuel mixture too weak MAF signal absent or faulty Coolant temperature sensor signal absent or faulty Ignition System RPM signal absent or faulty Battery voltage too low/high Heated oxygen Sensor Signal absent or faulty Long term fuel mixture too weak in part load stage Idle air control valve signal absent or faulty Long term fuel mixture too lean or rich in part load stage Long term fuel mixture too lean, idle Speedometer signal missing Throttle position sensor signal absent Long term fuel mix too rich, idle Short term fuel mix too rich
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