Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSPLYMOUTH1984HORIZON BASE, 1.6 AREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 9 (ENGINE CONTROLS - TESTS W/CODES - 3.5L)
1984 Plymouth Horizon Base, 1.6 A
Section 9 (Engine Controls - Tests W/Codes - 3.5L)
1984 Plymouth Horizon Base, 1.6 ASECTION Section 9 (Engine Controls - Tests W/Codes - 3.5L)
WARNING: This page is about a different car, the 1994 Eagle Vision, 1994 Dodge Intrepid, 1994 Chrysler New Yorker, 1994 Chrysler LHS, and 1994 Chrysler Concorde. However, it is still accessible from the selected car via links, so may be relevant.
- Introduction
- Self-Diagnostic System
- Inactive Trouble Code Condition
- Using DRB
- Fuel Pressure Release
- Trouble Codes/Messages
- CODES/MESSAGES (Note: For DTC table, see TEST TC-1A under "Self-Diagnostic Tests.")
- Connector Identification
- Self-Diagnostic Tests
- Notes
- Test TC-1A - Checking System For Trouble Codes
- Test TC-2A - No Crank Reference Signal At Pcm (DTC 11)
- Test TC-2B - No Crank Reference Signal At Pcm
- Test TC-3A - No Cam Sync Signal At Pcm (DTC 54)
- Test TC-4A - Map Sensor Voltage Too Low (DTC 14)
- Test TC-5A - Map Sensor Voltage Too High (DTC 14)
- Test TC-6A - No Change In Map From Start To Run (DTC 13)
- Test TC-7A - Throttle Position Sensor Voltage Low (DTC 24)
- Test TC-8A - Throttle Position Sensor Voltage High (DTC 24)
- Test TC-9A - Left O2S Stays At Center (DTC 21)
- Test TC-10A - Right O2S Stays At Center (DTC 21)
- Test TC-11A - Left O2S Shorted To Voltage (DTC 21)
- Test TC-12A - Right O2S Shorted To Voltage (DTC 21)
- Test TC-13A - Left O2S Stays Above Center (Rich) (DTC 52)
- Test TC-14A - Right O2S Stays Above Center (Rich) (DTC 52)
- Test TC-15A - Left O2S Stays Below Center (Lean) (DTC 51)
- Test TC-16A - Right O2S Stays Below Center (Lean) (DTC 51)
- Test TC-17A - Intake Air Temp Sensor Voltage Low (DTC 23)
- Test TC-18A - Intake Air Temp Sensor Voltage High (DTC 23)
- Test TC-19A - ECT Sensor Voltage Too Low (DTC 22)
- Test TC-20A - ECT Sensor Voltage Too High (DTC 22)
- Test TC-21A - A/C Pressure Sensor Volts Too High (DTC 33)
- Test TC-22A - A/C Pressure Sensor Volts Too Low (DTC 33)
- Test TC-23A - Flex Fuel Sensor Volts Too High/Low (DTC 64)
- Test TC-24A - Loss Of Flex Fuel Calibration Signal (DTC 64)
- Test TC-25A - Knock Sensor #1 Circuit (DTC 16)
- Test TC-26A - Knock Sensor #2 Circuit (DTC 16)
- Test TC-27A - No Vehicle Speed Sensor Signal (DTC 15)
- Test TC-27B - No Vehicle Speed Sensor Signal
- Test TC-28A - Idle Air Control Motor Circuits (DTC 25)
- Test TC-28B - Idle Air Control Motor Circuits
- Test TC-28C - Idle Air Control Motor Circuits
- Test TC-28D - Idle Air Control Motor Circuits
- Test TC-28E - Idle Air Control Motor Circuits
- Test TC-29A - Injector Control Circuits (DTC 27)
- Test TC-29B - Injector #1 Control Circuit
- Test TC-29C - Injector #1 Control Circuit
- Test TC-29D - Injector #1 Control Circuit
- Test TC-30A - Injector #2 Control Circuit (DTC 27)
- Test TC-30B - Injector #2 Control Circuit
- Test TC-30C - Injector #2 Control Circuit
- Test TC-31A - Injector #3 Control Circuit (DTC 27)
- Test TC-31B - Injector #3 Control Circuit
- Test TC-31C - Injector #3 Control Circuit
- Test TC-32A - Injector #4 Control Circuit (DTC 27)
- Test TC-32B - Injector #4 Control Circuit
- Test TC-32C - Injector #4 Control Circuit
- Test TC-33A - Injector #5 Control Circuit (DTC 27)
- Test TC-33B - Injector #5 Control Circuit
- Test TC-33C - Injector #5 Control Circuit
- Test TC-34A - Injector #6 Control Circuit (DTC 27)
- Test TC-34B - Injector #6 Control Circuit
- Test TC-34C - Injector #6 Control Circuit
- Test TC-35A - Ignition Coil Primary Circuits (DTC 43)
- Test TC-35B - Ignition Coil #1 Primary Circuit
- Test TC-36A - Ignition Coil #2 Primary Circuit (DTC 43)
- Test TC-37A - Ignition Coil #3 Primary Circuit (DTC 43)
- Test TC-37B - Ignition Coil Primary Circuits
- Test TC-38A - EGR System Failure (DTC 32)
- Test TC-39A - EGR Solenoid Control Circuit (DTC 32)
- Test TC-39B - EGR Solenoid Circuit
- Test TC-40A - EVAP Solenoid Control Circuit (DTC 31)
- Test TC-40B - EVAP Solenoid Control Circuit
- Test TC-41A - Manifold Tune Valve Solenoid Circuit (DTC 65)
- Test TC-41B - Manifold Tune Valve Solenoid Circuit
- Test TC-42A - Low Speed Fan CTRL Relay Circuit (DTC 35)
- Test TC-43A - High Speed Fan CTRL Relay Circuit (DTC 35)
- Test TC-44A - Auto Shutdown Relay Control Circuit (DTC 42)
- Test TC-45A - A/C Clutch Relay Circuit (DTC 33)
- Test TC-46A - No CCD Bus Messages (DTC 66)
- Test TC-47A - No CCD Messages From TCM (DTC 66)
- Test TC-48A - No CCD Messages From Body Control Module (BCM) (DTC 66)
- Test NTC-1A - No Trouble Code Test Menu
- Test NTC-2A - Checking Secondary Ignition & Timing
- Test NTC-3A - Checking Fuel Pressure
- Test NTC-3B - Checking Fuel Pressure
- Test NTC-4A - Checking Coolant Sensor Calibration & Radiator Fan Operation
- Test NTC-5A - Checking TPS Calibration
- Test NTC-6A - Checking Map Sensor Calibration
- Test NTC-7A - Checking Oxygen (O2) Sensor Switching
- Test NTC-7B - Checking Oxygen (O2) Sensor Switching
- Test NTC-8A - Checking Idle Air Control Motor
- Test NTC-8B - Checking Idle Air Control Motor
- Test NTC-9A - Checking Solenoid Operations
- Test NTC-10A - Checking MVLPS
- Test NTC-11A - Checking Pcm Ground & Power Circuits
- Test NTC-12A - Checking EGR System
- Test NTC-13A - Checking Engine Vacuum
- Test NTC-14A - Checking Minimum Idle Airflow
- Test NTC-15A - Performing No Trouble Code Mechanical Test
- No-Start Tests
- Test NS-1A - Qualifying No Start Condition
- Test NS-2A - Inspecting Fuel System
- Test NS-3A - Inspecting Mechanical System
- Test NS-4A - Correcting Fuel Delivery
- Test NS-4B - Correcting Fuel Delivery
- Test NS-5A - Inspecting Fuel Pump
- Test NS-5B - Inspecting Fuel Pump
- Test NS-6A - Correcting No Response Condition
- Test NS-6B - Correcting No Response Condition
- Test NS-7A - Inspecting Idle Air Control Motor Operation
- Test NS-7B - Inspecting Idle Air Control Motor Operation
- Test NS-7C - Inspecting Idle Air Control Motor Operation
- Test NS-7D - Inspecting Idle Air Control Motor Operation
- Test NS-7E - Inspecting Idle Air Control Motor Operation
- Test NS-8A - Correcting Start & Stall Condition
- Test NS-9A - Repairing No Crank Condition
- Verification Tests
- Wiring Diagrams
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.