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.
With Manual Transmission
1997 Mercury Tracer L4-122 2.0L SOHCSECTION With Manual Transmission
TYPICAL DIAGNOSTIC REFERENCE VALUES
GENERIC OBD II PID VALUES
NOTES:
- All generic OBD II readings are under no load (PARK or NEUTRAL).
- These footnotes are referenced throughout the Typical Diagnostic Reference Value Charts. A letter in parentheses next to a value indicates supplemental information is applicable.
- An attempt is made to provide as much information as possible; some vehicles may not display all input and output signals.
- Reference values may vary ± 20% depending on operating conditions and other factors. RPM values are axle and tire dependent.
- Downstream O2S (12, 22) will only switch lean to rich when catalyst monitor is active.
(A.) A/C ON.
(B.) Cooling fan ON (single, low or high speed).
(C.) O2S(s) should switch from rich to lean at least once every 3 seconds. O2S voltage should toggle above and below 0.450 DCV and never be a negative value. Valid O2S switching only occurs during closed loop fuel control.
(D.) Downstream O2S(S) will stay at a constant voltage when the catalyst monitor is OFF (positive value only). When the catalyst monitor is ON, O2S will switch rich to lean above and below 0.450 DCV and never be a negative value.
(E.) Brake pedal applied.
(F.) Catalyst monitor OFF.
(G.) With Transmission Control Switch (TCS) ON, overdrive enabled.
(H.) Values shown are commanded by the PCM and may not be actual.
(I.) Steering wheel turned.
(J.) Clutch pedal applied.
(K.) Value is dependent upon ambient air temperature and may fall outside of range.
(L.) Value is not useful under this condition.
(M.) If equipped.
(N.) Transmission in selected range.
(O.) Headlamps ON.
(P.) Rear defrost ON.
(Q.) Blower motor ON.
(R.) Values recorded using 100% gasoline.
(S.) May change state under this condition.
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.