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 MANUALSPLYMOUTH1985HORIZON L4-135 2.2L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULETECHNICAL SERVICE BULLETINSCUSTOMER INTERESTENGINE - FAILING STATE I/M EMISSIONS INSPECTION FOR CO
1985 Plymouth Horizon L4-135 2.2L SOHC
Engine - Failing State I/M Emissions Inspection for CO
1985 Plymouth Horizon L4-135 2.2L SOHCSECTION Engine - Failing State I/M Emissions Inspection for CO
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Models
1985 Domestic Front Wheel Drive Cars With 2.2L EFI Engine (NonTurbo) & Automatic Transmission
Subject
Failing State "CO" Emission Inspection
Index
EMISSIONS
Date
February 25, 1985
No..
25-05-85
P-637-C
SYMPTOM/CONDITION
A subject model vehicle fails a state "CO" emission idle inspection performed with transmission in park/neutral.
This service applies to subject model vehicles built prior to early November, 1984, and equipped with logic module part numbers 5226251 for Federal or 5226254 for California.
DIAGNOSIS/CORRECTION
If vehicle passes "CO" idle emissions test in drive gear, but fails in park/neutral, the logic module must be replaced with service module PN 5226741 Federal or PN 5226648 California.
If vehicle still fails when tested in drive or after module is replaced, further diagnosis is required to find cause and correction.
INFORMATION
The service logic modules are calibrated identical to the original modules except the service modules remain in closed loop fuel control in park/neutral.
The original modules allow open loop fuel control in park/neutral which, in some cases, causes excessive "CO" in state idle emission testing.
POLICY: Reimbursable within the provisions of the warranty
TIME ALLOWANCE: Refer to existing Labor Operation Time Schedule for logic module replacement.
Models
1985 Domestic Front Wheel Drive Cars With 2.2L EFI Engine (NonTurbo) & Automatic Transmission
Subject
Failing State "CO" Emission Inspection
Index
EMISSIONS
Date
February 25, 1985
No..
25-05-85
P-637-C
SYMPTOM/CONDITION
A subject model vehicle fails a state "CO" emission idle inspection performed with transmission in park/neutral.
This service applies to subject model vehicles built prior to early November, 1984, and equipped with logic module part numbers 5226251 for Federal or 5226254 for California.
DIAGNOSIS/CORRECTION
If vehicle passes "CO" idle emissions test in drive gear, but fails in park/neutral, the logic module must be replaced with service module PN 5226741 Federal or PN 5226648 California.
If vehicle still fails when tested in drive or after module is replaced, further diagnosis is required to find cause and correction.
INFORMATION
The service logic modules are calibrated identical to the original modules except the service modules remain in closed loop fuel control in park/neutral.
The original modules allow open loop fuel control in park/neutral which, in some cases, causes excessive "CO" in state idle emission testing.
POLICY: Reimbursable within the provisions of the warranty
TIME ALLOWANCE: Refer to existing Labor Operation Time Schedule for logic module replacement.
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.