Toyota OBD/OBD2 Codes >> Toyota 88-91 Pickup or 4Runner

Accessing Trouble Codes

  • Switch ignition ON. Do NOT start engine.
  • Jump DLC terminals T and E1 with a short lead 1
  • 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

  • After the faults have been rectified, erase the trouble codes as follows:
  • 1988 4Runner/Pickup – remove EFI fuse (15A) from LH kick panel fusebox for 30 seconds minimum 4
  • 1989 on 4Runner/Pickup – remove EFI fuse (15A) from underhood fusebox for 30 seconds minimum 4
  • Reinstall fuse
  • Repeat accessing procedure to ensure no data remains in ECM fault memory

 Trouble Codes

88-91 Pickup 2.4L Engine Code: 22R-E
88-91 Pickup 3.0L Engine Code: 3VZ-E
88-91 4Runner 2.4L Engine Code: 22R-E
88-91 4Runner 3.0L Engine Code: 3VZ-E
Trouble code Fault location Probable Cause
11 Engine control module (ECM) power supply Wiring, ignition switch, engine control relay, ECM
12 Engine speed (RPM) sensor -circuit Wiring, RPM sensor, ignition module, ECM
13 Engine speed (RPM) sensor -above 1000 rpm Wiring, RPM sensor, ignition module, ECM
14 Ignition reference signal -no signal Wiring, ignition module/coil, 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, lAT sensor, ECM
25 Mixture control -continuously lean Wiring, injector, H02S, ECTNAF sensor, intake/fue/lignition system, ECM
26 Mixture control -continuously rich Wiring, injector, fuel system, cold start injector, H02S, VAF sensor, ECM
27 Heated oxygen sensor (H02S)-rear-circuit Wiring, H02S, ECM
31 Volume air flow (VAF) sensor-circuit Wiring, VAF sensor, ECM
32 Volume air flow (VAF) sensor-circuit Wiring, VAF sensor, ECM
35 Barometric pressure (BARO) sensor-circuit Wiring, BARO sensor, 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, 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/neutra! position (PNP) switch not in P or N during diagnosis Wiring, PNP switch, ECM
52 Knock sensor (KS) -circuit Wiring, KS, ECM
53 Knock control malfunction ECM
71 Exhaust gas recirculation (EGR) system malfunction Hose leak/blockage, wiring, EGRT sensor, EGR solenoid, ECM

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