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 4 (ENGINE CONTROLS - TESTS W/CODES - 3.0L)
1984 Plymouth Horizon Base, 1.6 A
Section 4 (Engine Controls - Tests W/Codes - 3.0L)
1984 Plymouth Horizon Base, 1.6 ASECTION Section 4 (Engine Controls - Tests W/Codes - 3.0L)
WARNING: This page is about a different car, the 1994 Plymouth Sundance, 1994 Plymouth Acclaim, 1994 Dodge Spirit, 1994 Dodge Shadow, and 1994 Chrysler LeBaron. However, it is still accessible from the selected car via links, so may be relevant.
- Introduction
- Model Identification
- Self-Diagnostic System
- Inactive Trouble Code Condition
- Using DRB
- Fuel Pressure Release
- DTC & Fault Codes/Messages
- Connector Identification
- Self-Diagnostic Tests
- Diagnostic Charts
- 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 - No Change In Map From Start To Run (DTC 13)
- Test TC-5A - Map Sensor Voltage Too Low (DTC 14)
- Test TC-6A - Map Sensor Voltage Too High (DTC 14)
- Test TC-7A - No Vehicle Speed Sensor Signal (DTC 15)
- Test TC-7B - No Vehicle Speed Sensor Signal
- Test TC-7C - No Vehicle Speed Sensor Signal
- Test TC-7D - No Vehicle Speed Sensor Signal
- Test TC-8A - O2S Stays At Center (DTC 21)
- Test TC-9A - O2S Stays Above Center (Rich) (DTC 52)
- Test TC-10A - O2S Stays Below Center (Lean) (DTC 51)
- Test TC-11A - O2S Shorted To Voltage (DTC 21)
- Test TC-12A - ECT Sensor Voltage Too Low (DTC 22)
- Test TC-13A - ECT Sensor Voltage Too High (DTC 22)
- Test TC-14A - Throttle Position Sensor Voltage Low (DTC 24)
- Test TC-15A - Throttle Position Sensor Voltage High (DTC 24)
- Test TC-16A - Idle Air Control Motor Circuits (DTC 25)
- Test TC-16B - Idle Air Control Motor Circuits
- Test TC-16C - Idle Air Control Motor Circuits
- Test TC-16D - Idle Air Control Motor Circuits
- Test TC-16E - Idle Air Control Motor Circuits
- Test TC-17A - Injector Control Circuit (DTC 27)
- Test TC-17B - Injector #1 Control Circuit
- Test TC-17C - Injector #1 Control Circuit
- Test TC-18A - Injector #2 Control Circuit (DTC 27)
- Test TC-18B - Injector #2 Control Circuit
- Test TC-19A - Injector #3 Control Circuit (DTC 27)
- Test TC-19B - Injector #3 Control Circuit
- Test TC-20A - Injector #4 Control Circuit (DTC 27)
- Test TC-20B - Injector #4 Control Circuit
- Test TC-21A - Injector #5 Control Circuit (DTC 27)
- Test TC-21B - Injector #5 Control Circuit
- Test TC-22A - Injector #6 Control Circuit (DTC 27)
- Test TC-22B - Injector #6 Control Circuit
- TEST TC-23A - PCM FAILURE SRI MILE NOT STORED OR PCM FAILURE EEPROM WRITE DENIED (DTC 62 or 63)
- Test TC-24A - EGR System Failure (DTC 32)
- Test TC-25A - EGR Solenoid Circuit (DTC 32)
- Test TC-26A - EVAP Solenoid Circuit (DTC 31)
- Test TC-27A - Torque Converter Clutch Solenoid Circuit (DTC 37)
- Test TC-28A - No ASD Relay Volt Sensed At Pcm (DTC 42)
- Test TC-29A - Auto Shutdown Relay Control Circuit (DTC 42)
- Test TC-30A - A/C Clutch Relay Circuit (DTC 33)
- Test TC-31A - Radiator Fan Relay Circuit (DTC 35)
- Test TC-32A - Low Speed Fan CTRL Relay Circuit (DTC 35)
- Test TC-33A - High Speed Fan CTRL Relay Circuit (DTC 35)
- Test TC-38A - Battery Temp Sensor Volts Out Of Limit (DTC 44)
- 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 Park/Neutral Switch
- Test NTC-11A - Checking Pcm Ground & Power Circuits
- Test NTC-12A - Checking Engine Vacuum
- Test NTC-13A - Checking Minimum Idle Airflow
- Test NTC-14A - 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-6C - Correcting No Response Condition
- Test NS-6D - 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
- Test NS-9B - Repairing No Crank Condition
- Test NS-9C - 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.