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.
1988 Toyota Camry Base, StandardFACTORY OEM SERVICE PROCEDURE
System Testing
- If trouble codes exist and diagnostic circuit check has been performed, compare code with appropriate code chart for circuits and components associated with trouble code(s). Trouble code flow charts are arranged in alphabetical order by each model. A test No. has been assigned each chart. The test No. and trouble code are in numerical order for each model. All ECU pin identifications are at end of TROUBLE CODES & PROBABLE CAUSE charts.
- If no code is present, circuit checking is necessary. Each model has an ECU PIN VOLTAGE TEST after DIAGNOSTIC CIRCUIT CHECK flow chart. DIAGNOSTIC CIRCUIT CHECK flow chart is the first flow chart on each model. Using appropriate ECU PIN VOLTAGE TEST, check appropriate circuits using the test No. in the right column of the appropriate table. See CODE CHARTS .
- Component testing will also be necessary. All component testing available pertaining to CEC, follow the CEC flow charts. For components not covered, see appropriate article in FUEL or DISTRIBUTORS & IGNITION SYSTEMS.
TROUBLE CODE IDENTIFICATION
| Code No. | Circuit Affected | ||||||
|---|---|---|---|---|---|---|---|
| No Code | System Normal | ||||||
| 11 | ECU (B+) | ||||||
| 12 & 13 | RPM Signal | ||||||
| 14 | Ignition Signal | ||||||
| 21 | Oxygen Sensor Signal | ||||||
| 22 | Coolant Temp. Sensor Signal | ||||||
| 24 | Intake Air Temp. Sensor Signal | ||||||
| 25 (1) | Lean Air/Fuel Mixture | ||||||
| 26 (1) | Rich Air/Fuel Mixture | ||||||
| 27 (2) | Sub-Oxygen Sensor Signal | ||||||
| 31 | Airflow Meter Signal | ||||||
| 32 | Airflow Meter Signal | ||||||
| 41 | Throttle Position Sensor Signal | ||||||
| 42 | Vehicle Speed Sensor Signal | ||||||
| 43 | Starter Signal | ||||||
| 51 | Switch Signal | ||||||
| 71 (3) | EGR System Malfunction | ||||||
|
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TROUBLE CODES & PROBABLE CAUSE
| Code No. | Probable Cause | ||||||
|---|---|---|---|---|---|---|---|
| 11 | Main Relay and/or Circuit, Ignition Switch and/or Circuit, ECU | ||||||
| 12 | Distributor and/or Circuit, Starter Signal, ECU | ||||||
| 13 | Distributor and/or Circuit, ECU | ||||||
| 14 | Ignition Coil, Ignitor and/or Circuit, ECU | ||||||
| 21 | O2 Sensor and/or O2 Heater Signal and/or Circuit, ECU | ||||||
| 22 | Coolant Temp. Sensor and/or Circuit, ECU | ||||||
| 24 | Intake Air Temp. Sensor or Circuit, ECU | ||||||
| 25 (1) | Injector and/or Circuit, O2 Sensor and/or, Circuit, Fuel Line Pressure, Airflow Meter, Coolant Temp. Sensor, Ignition System, ECU | ||||||
| 26 (1) | Injector and/or Circuit, Fuel Line Pressure, Cold Start Injector, Airflow Meter, Coolant Temp. Sensor, ECU | ||||||
| 27 (2) | Sub-O2 Sensor/Heater and/or Circuit, ECU | ||||||
| 31 | Airflow Meter and/or Circuit, ECU and/or Circuit, ECU Airflow Meter, ECU, Intercooler | ||||||
| 41 | Throttle Position Sensor and/or Circuit, ECU | ||||||
| 42 | Speed Sensor and/or Circuit, ECU | ||||||
| 43 | Ignition Switch and/or Circuit, ECU | ||||||
| 51 | Throttle Position Sensor and/or Circuit Switch Circuit, A/C Amplifier, ECU Neutral/Start Switch and/or Circuit, Accelerator Pedal and/or Cable and/or Circuit, Intercooler Water Pump and/or Circuit, Intercooler ECU, ECU | ||||||
| 71 (3) | EGR System, EGR Gas Temp. Sensor and/or Circuit, BVSV for EGR and/or Circuit, ECU | ||||||
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Factory Service Tools
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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.
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