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