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 21 (CRUISE CONTROL SYSTEM)SELF-DIAGNOSTICSCLEARING TROUBLE CODES
1984 Plymouth Horizon Base, 1.6 A
Clearing Trouble Codes
1984 Plymouth Horizon Base, 1.6 ASECTION Clearing Trouble Codes
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.
NOTE:
Trouble codes can also be cleared in READ TROUBLE CODES option of DRB. To ensure that all trouble codes are read, it is advisable to use READ TROUBLE CODES option to erase trouble codes. See DRB DIAGNOSTIC MODE under ENTERING ON-BOARD DIAGNOSTICS
.
- If DRB is not available, go to step 3). If DRB is available, enter SPEED CONTROL MENU. See DRB TEST FUNCTIONS . At SPEED CONTROL MENU, press "5" (ADJUSTMENTS) key. Press ENTER key. At ADJUSTMENTS menu, press "1" (ERASE TROUBLE CODES) key. Press ENTER key.
- DRB will display ERASE TROUBLE CODES ARE YOU SURE? (ENTER TO ERASE). Press ENTER key. When DRB is finished erasing trouble codes, screen will display TROUBLE CODES ERASED.
- If DRB is not available, trouble codes may be cleared by disconnecting negative battery cable for at least 15 seconds, allowing PCM to clear trouble codes.
TROUBLE CODES
| Code | Display On DRB | ||||||
|---|---|---|---|---|---|---|---|
| 15 (1) | NO VEHICLE SPEED SIGNAL | ||||||
| 34 (2) | SPEED CONTROL SOLENOID CIRCUITS | ||||||
| 77 (3) | SPEED CONTROL POWER RELAY CIRCUIT | ||||||
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RENDER: 1.0x
NO RELATED
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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.