1988 Toyota CressidaFACTORY OEM SERVICE PROCEDURE

Trouble Code Identification

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
31 Airflow Meter Signal
32 Airflow Meter Signal HAC Sensor Signal
41 Throttle Position Sensor Signal
42 Vehicle Speed Sensor Signal
43 Starter Signal
51 Switch Signal
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
31 Airflow Meter and/or Circuit, ECU
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 A/C Switch Circuit, A/C Amplifier, ECU Neutral/Start Switch and/or Circuit, Accelerator Pedal and/or Cable
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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.