Wiring Diagram Cluster

1985 Plymouth Horizon Engine Management Wiring Diagram

Find ECU/PCM wiring, fuel injector circuits, ignition coil paths, and oxygen sensor schematics for engine diagnostics.

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Matched Diagrams

48

Variant Used

Horizon L4-135 2.2L SOHC

Total Vehicle Diagrams

162

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1985 Plymouth Horizon Application and ID

OEM source

Factory Manual Evidence

When there is no clean repair shortcut for this system, drop into the OEM manual sections that usually carry the authoritative test path.

1985 Plymouth Horizon Application and ID →
1985 Plymouth Horizon Application and ID1985 Plymouth Horizon A L L Diagnostic Trouble Codes ( DTC )1985 Plymouth Horizon A L L Diagnostic Trouble Codes ( DTC )

Diagnostic signal

Codes Often Seen With This System

Use the code cluster when wiring faults overlap with check-engine or module-level diagnostics.

P0301: Cylinder 1 Misfire Detected →
P0030: HO2S Heater Control Circuit (Bank 1, Sensor 1)P0300: Random/Multiple Cylinder Misfire DetectedP0351: Ignition Coil A Primary/Secondary Circuit

Top Engine Management Diagram Paths

1.Electrical Diagrams > Powertrain Management > Computers and Control Systems > Engine Control ModuleGeneralOpen2.Electrical Diagrams > Powertrain Management > Computers and Control Systems > Oxygen SensorGeneralOpen3.Electrical Diagrams > Powertrain Management > Computers and Control Systems > Throttle Position SensorGeneralOpen4.Engine > Engine Lubrication — DiagramEngine, Cooling and ExhaustOpen5.Electrical Diagrams > Oil Temperature Sensor/Switch, EngineGeneralOpen6.Electrical Diagrams > Powertrain Management > Computers and Control Systems > Body Control ModuleGeneralOpen7.Electrical Diagrams > Powertrain Management > Computers and Control Systems > Camshaft Position SensorGeneralOpen8.Electrical Diagrams > Powertrain Management > Computers and Control Systems > Crankshaft Position SensorGeneralOpen9.Electrical Diagrams > Powertrain Management > Computers and Control Systems > System DiagramGeneralOpen10.Electrical Diagrams > Powertrain Management > Computers and Control Systems > Vehicle Speed SensorGeneralOpen11.Electrical Diagrams > Powertrain Management > Emission Control SystemsGeneralOpen12.Electrical Diagrams > Powertrain Management > Fuel Delivery and Air Induction > CarburetorGeneralOpen13.Electrical Diagrams > Powertrain Management > Fuel Delivery and Air Induction > Fuel PumpGeneralOpen14.Electrical Diagrams > Powertrain Management > Fuel Delivery and Air Induction > System Diagram > Complete System DiagramGeneralOpen15.Electrical Diagrams > Powertrain Management > Fuel Delivery and Air Induction > System Diagram > Fuel System Wiring Diagram > Part 1 of 2GeneralOpen16.Electrical Diagrams > Powertrain Management > Fuel Delivery and Air Induction > System Diagram > Fuel System Wiring Diagram > Part 2 of 2GeneralOpen17.Electrical Diagrams > Powertrain Management > Fuel Delivery and Air Induction > System Diagram > Fuel Tank System Wiring CircuitGeneralOpen18.Electrical Diagrams > Powertrain Management > Ignition System > Ignition Control ModuleGeneralOpen19.Electrical Diagrams > Powertrain Management > Ignition System > System DiagramGeneralOpen20.Electrical Diagrams > Powertrain Management > System Diagram > Diagrams > Part 1GeneralOpen21.Electrical Diagrams > Powertrain Management > System Diagram > Diagrams > Part 2GeneralOpen22.Electrical Diagrams > Powertrain Management > System Diagram > Electronic Spark Advance System Wiring Circuit > Part 1 of 2GeneralOpen23.Electrical Diagrams > Powertrain Management > System Diagram > Electronic Spark Advance System Wiring Circuit > Part 2 of 2GeneralOpen24.Fluid Diagrams > Engine LubricationGeneralOpen25.Splices > Engine Compartment SplicesGeneralOpen26.Splices > Engine SplicesGeneralOpen27.Computers and Control Systems — Connector ViewsPowertrain ManagementOpen28.Computers and Control Systems — Diagram Information and InstructionsPowertrain ManagementOpen29.Computers and Control Systems — Electrical DiagramsPowertrain ManagementOpen30.Cooling System — Diagram Information and InstructionsEngine, Cooling and ExhaustOpen31.Cooling System — Electrical Diagrams > Radiator Fan (Heater Only)Engine, Cooling and ExhaustOpen32.Cooling System — Electrical Diagrams > Radiator Fan and Compressor CircuitsEngine, Cooling and ExhaustOpen33.Diagram Information and InstructionsPowertrain ManagementOpen34.Electrical Diagrams > Diagrams > Part 1Powertrain ManagementOpen35.Electrical Diagrams > Diagrams > Part 2Powertrain ManagementOpen36.Electrical Diagrams > Electronic Spark Advance System Wiring Circuit > Part 1 of 2Powertrain ManagementOpen37.Electrical Diagrams > Electronic Spark Advance System Wiring Circuit > Part 2 of 2Powertrain ManagementOpen38.Emission Control Systems — Diagram Information and InstructionsPowertrain ManagementOpen39.Emission Control Systems — Electrical DiagramsPowertrain ManagementOpen40.Emission Control Systems — Vacuum and Vapor Hose Diagrams > CaliforniaPowertrain ManagementOpen41.Emission Control Systems — Vacuum and Vapor Hose Diagrams > FederalPowertrain ManagementOpen42.Emission Control Systems > Air Injection — DiagramPowertrain ManagementOpen43.Fuel Delivery and Air Induction — Diagram Information and InstructionsPowertrain ManagementOpen44.Fuel Delivery and Air Induction — Electrical Diagrams > Complete System DiagramPowertrain ManagementOpen45.Fuel Delivery and Air Induction — Electrical Diagrams > Fuel System Wiring Diagram > Part 1 of 2Powertrain ManagementOpen46.Fuel Delivery and Air Induction — Electrical Diagrams > Fuel System Wiring Diagram > Part 2 of 2Powertrain ManagementOpen47.Fuel Delivery and Air Induction — Electrical Diagrams > Fuel Tank System Wiring CircuitPowertrain ManagementOpen48.Fuel Delivery and Air Induction > Carburetor — Diagram Information and InstructionsPowertrain ManagementOpen

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1985 Plymouth Horizon Repair HubExact Vehicle

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OEM Manual Evidence

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1985 Plymouth Horizon Application and IDOEM Manual

Repair and Diagnosis: Application and ID — 1985 Plymouth Horizon L4-97 1.6L SOHC Service Manual | Operation CHARM Operation CHARM : Car rep...

1985 Plymouth Horizon Application and IDOEM Manual

Repair and Diagnosis: Application and ID — 1985 Plymouth Horizon L4-135 2.2L SOHC Service Manual | Operation CHARM Operation CHARM : Car re...

1985 Plymouth Horizon A L L Diagnostic Trouble Codes ( DTC )OEM Manual

A L L Diagnostic Trouble Codes ( DTC ) — 1985 Plymouth Horizon L4-97 1.6L SOHC Service Manual | Operation CHARM Operation CHARM : Car repai...

1985 Plymouth Horizon A L L Diagnostic Trouble Codes ( DTC )OEM Manual

A L L Diagnostic Trouble Codes ( DTC ) — 1985 Plymouth Horizon L4-135 2.2L SOHC Service Manual | Operation CHARM Operation CHARM : Car repa...

Likely Trouble Codes for This System

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P0301: Cylinder 1 Misfire DetectedCode

Ignition code commonly seen during engine management diagnosis.

P0030: HO2S Heater Control Circuit (Bank 1, Sensor 1)Code

Emissions code commonly seen during engine management diagnosis.

P0300: Random/Multiple Cylinder Misfire DetectedCode

Ignition code commonly seen during engine management diagnosis.

P0351: Ignition Coil A Primary/Secondary CircuitCode

Ignition code commonly seen during engine management diagnosis.

P0352: Ignition Coil B Primary/Secondary CircuitCode

Ignition code commonly seen during engine management diagnosis.

P0353: Ignition Coil C Primary/Secondary CircuitCode

Ignition code commonly seen during engine management diagnosis.

More Horizon Wiring Pages

Starter Wiring DiagramAlternator Wiring DiagramHeadlight Wiring DiagramA/C & Heater Wiring DiagramInstrument Cluster Wiring DiagramWiper & Washer Wiring DiagramTransmission Wiring DiagramCruise Control Wiring DiagramAirbag SRS Wiring DiagramBody Electrical Wiring Diagram

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