Toyota OBD1 Trouble Codes and Fault Code List >> Toyota 91-95 Previa 2.4L

Preparatory Conditions

  • Battery voltage 11 Volt minimum
  • Closed throttle position (CTP) switch full closed
  • Transmission in neutral position
  • All auxiliary equipment, including air conditioning, switched OFF
  • Engine at normal operating temperature

Accessing Trouble Codes

  • Switch ignition ON. Do NOT start engine.
  • Check MIL illuminates
  • Switch ignition OFF
  • Jump DLC terminals TE1 and E1 with a short lead 1
  • Switch ignition ON
  • Count MIL flashes and compare with trouble code table below
  • First flashes of .5 second duration indicate ‘tens’, after a 1.5 second pause, next flashes of .5 second duration indicate ‘units’
  • A 2.5 second pause occurs between codes
  • After a 4.5 second pause, trouble codes will be repeated
  • Switch ignition OFF
  • Remove jump lead

Clearing Trouble Codes

  • Ensure ignition switched OFF
  • Remove EFI fuse (15A) from fascia fusebox 4
  • Wait 30 seconds
  • Reinstall fuse
  • Repeat accessing procedure to ensure no data remains in ECM fault memory

 Trouble Codes

91-95 Previa 2.4L Engine Code: 2TZ-FE
Trouble codeFault locationProbable cause
12Engine speed (RPM) sensor -circuitWiring, RPM sensor, ignition module, ECM
13Engine speed (RPM) sensor -above 1000 rpmWiring, RPM sensor, ECM
14Ignition reference signal -no signalWiring, ignition module, ECM
21Heated oxygen sensor (H02S)- front – circuitWiring, H02S, ECM
22Engine coolant temperature (ECT) sensor -circuitWiring, ECT sensor, ECM
24lntake air temperature (lAT) sensor circuitWiring, IAT sensor, ECM
25Mixture control -continuously leanWiring, injector, H02S, ECT/VAF sensor, intake/fuel/ignition system, ECM
26Mixture control -continuously richWiring, injector, fuel system, cold start injector, H02S, ECT/VAF sensor, ECM
27Heated oxygen sensor (H02S) rear circuitWiring, H02S, ECM
31Volume air flow (VAF) sensor-circuitWiring, VAF sensor, ECM
32Volume air flow (VAF) sensor-circuitWiring, VAF sensor, ECM
41Throttle position (TP) sensor -circuitWiring, TP sensor, ECM
42Vehicle speed sensor (VSS) -circuitWiring, VSS, ECM
43Starter signal -circuitWiring, ignition switch, engine control relay, ECM
51Switch signal -closed throttle position (CTP) switch OFF during diagnosisWiring, CTP switch, ECM
51Switch signal -park/neutral position (PNP) switch not in P or N during diagnosisWiring, PNP switch, ECM
52Knock sensor (KS) -circuitWiring, KS, ECM
53Knock control -malfunctionECM
71Exhaust gas recirculation (EGR) system malfunctionHose leak/blockage, wiring, EGRT sensor, EGR solenoid, ECM