1993 Toyota Land CruiserFACTORY OEM SERVICE PROCEDURE

Trouble Code Identification

TROUBLE CODE IDENTIFICATION (1)

CODE No. System Affected MIL inNORMAL MODE MIL in TEST MODE Probable Cause
12  RPM Signal ON N/A Distributor, Starter or Ckt, ECM
13  RPM Signal ON ON Distributor or Ckt, ECM
14  Ignition Signal ON N/A Ignitor or Ckt to ECM. ECM
21  No. 1 O2 Sensor Signal (2) ON ON No. 1 O2 Sensor or Ckt, ECM
22  Coolant Temp. Sensor Signal ON ON Coolant Temp. Sensor or Ckt, ECM
24  Intake Air Temp. Sensor Signal ON (3) ON Intake Air Temp. Sensor or Ckt, ECM
25  Lean Air/Fuel Mixture ON ON Loose Ground, Injector or Ckt, Fuel Pressure, Ignition System, Coolant Temp. Sensor,Airflow Meter, Vacuum Sensor,O2 Sensor or Ckt, CompressionPressure, ECM
26  Rich Air/Fuel Mixture ON ON Loose Ground, Injector or Ckt, Fuel Pressure, Ignition System, Coolant Temp. Sensor,Airflow Meter, Vacuum Sensor,O2 Sensor or Ckt, Cold Start Injector or Ckt, Compression Pressure, ECM
28  No. 2 O2 Sensor Signal (4) ON ON No. 2 O2 Sensor or Ckt, ECM
31  Airflow Meter ON ON Airflow Meter or Ckt, ECM
32  Airflow Meter ON ON Airflow Meter or Ckt, ECM
41  TPS Signal ON (3) ON Throttle Position Sensor or Ckt, ECM
42  Vehicle Speed Sensor Signal OFF OFF Vehicle Speed Sensor or Ckt, ECM
43  Starter Signal N/A OFF Starter Signal Ckt, Main Relay, Ignition Switch or Ckt, ECM
51  Switch Condition Signal N/A OFF A/C Switch, Park/Neutral Switch or Ckt, TPS or Ckt, ECM
52  Front Knock (5) Sensor Signal ON N/A Front Knock Sensor or Ckt, ECM
53  Knock Control Signal ON N/A ECM
55  Rear Knock (6) Sensor Signal ON N/A Rear Knock Sensor or Ckt, ECM
71 (7) EGR System Malfunction ON ON EGR System, EGR Temp. Sensor or Ckt, EGR-VSV, ECM
81  Trans. Control Module Communication ON N/A ECT1 Ckt
83  Trans. Control Module Communication ON N/A ESA1 Ckt
84  Trans. Control Module Communication ON N/A ESA2 Ckt
85  Trans. Control Module Communication ON N/A ESA3 Ckt
(1) ON indicates MIL on instrument panel will be illuminated. N/A indicates item is not included in malfunction diagnosis when using this mode. OFF indicates MIL on instrument panel will be not be illuminated even if malfunction is detected.
(2) The No. 1 oxygen sensor is located on exhaust pipe closest to outside of vehicle on passenger's side.
(3) The MIL will be illuminated on California models only.
(4) The No. 2 oxygen sensor is located on exhaust pipe closest to outside of vehicle on driver's side.
(5) Front knock sensor may be referred to as No. 1 knock sensor.
(6) Rear knock sensor may be referred to as No. 2 knock sensor.
(7) Applies to California models only.
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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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