Toyota OBD/OBD2 Codes >> Toyota 91-95 MR2 5S-FE or 92-95 Paseo 5E-FE

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
  • Paseo – Jump DLC terminals TE1 and E1 with a short lead 1
  • MR2 – Jump DLC terminals TE1 and E1 with a short lead 2
  • 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
  • Paseo – remove EFI fuse (15A) from underhood fusebox¬†5
  • MR2 – remove EFI fuse (15A) from underhood fusebox¬†6
  • Wait 30 seconds
  • Reinstall fuse
  • Repeat accessing procedure to ensure no data remains in ECM fault memory

 Trouble Codes

91-95 MR2 2.2L Engine Code: 5S-FE
92-95 Paseo 1.5L Engine Code: 5E-FE
Trouble code Fault location Probable cause
12 Engine speed (RPM) sensor -circuit Wiring, RPM sensor, ECM
13 Engine speed (RPM) sensor -above 1000 rpm Wiring, RPM sensor, ECM
14 Ignition reference signal -no signal Wiring, ignition module, ECM
16 Transmission control signal -malfunction ECM
21 Heated oxygen sensor (H02S)-front-circuit Wiring, H02S, ECM
22 Engine coolant temperature (ECT) sensor circuit Wiring, ECT sensor, ECM
24 lntake air temperature (lAT) sensor -circuit Wiring, IAT sensor, ECM
25 Mixture control -continuously lean Wiring, injector, H02S, ECT/MAP sensor, intake fuel/ignition/EGR system, ECM
26 Mixture control -continuously rich Wiring, injector, fuel system, H02S, ECT/MAP sensor, ECM
27 Heated oxygen sensor (H02S)-rear -circuit Wiring, H02S, ECM
31 Manifold absolute pressure (MAP) sensor -circuit Wiring, MAP sensor, ECM
33 ldle air control (lAC) valve-circuit Wiring, IAC valve, ECM
41 Throttle position (TP) sensor -circuit Wiring, TP sensor, ECM
42 Vehicle speed sensor (VSS) circuit Wiring, VSS, ECM
43 Starter signal -circuit Wiring, ignition switch, engine control retay, ECM
51 Switch signal A/C switch ON during diagnosis Wiring, A/C switch, A/C amplifier, ECM
51 Switch signal -closed throttle position (CTP) switch OFF during diagnosis Wiring, CTP switch, ECM
51 Switch signal -park/neutral position (PNP) switch not in P or N during diagnosis Wiring, PNP switch, ECM
52 Knock sensor (KS) -circuit Wiring, KS, ECM
71 Exhaust gas recirculation (EGR) system malfunction Hose leak/blockage, wiring, EGRT sensor, EGR sotenoid, ECM

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