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
Self-Diagnosis – Normal Mode- Switch ignition ON. Do NOT start engine.
- Check MIL illuminates
- Switch ignition OFF
- 4Runner/Pickup – jump DLC terminals TE1 and E1 with a short lead 1
- T100 Pickup – 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
- Carry out preparatory conditions
- 4Runner/Pickup – jump DLC terminals TE2 and E1 with a short lead 1
- T100 Pickup – jump DLC terminals TE2 and E1 with a short lead 2
- Switch ignition ON. Do NOT start engine
- Check MIL is flashing to confirm test mode is operating
- NOTE: Test mode will not be activated if the DLC terminals are connected after the ignition switch is turned ON.
- Start the engine
- Drive vehicle over 10 mph to simulate possible fault conditions
- Stop vehicle
- Jump DLC terminals TE1 and E1 with a short lead 1 or 2
- Count MIL flashes and compare with trouble code table below
- Switch ignition OFF
- Remove jump leads
Clearing Trouble Codes
- Ensure ignition switched OFF
- Corolla – remove EFI fuse (15A) from underhood fusebox 5
- Celica – 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
| 92-95 4Runner 3.0L Engine Code: 3VZ-E | ||
|---|---|---|
| 92-95 Pickup 3.0L Engine Code: 3VZ-E | ||
| 93-94 T100 Pickup 3.0L Engine Code: 3VZ-E | ||
| 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, lAT sensor, ECM |
| 25 | Mixture control -continuously lean | Wiring, injector, H02S, ECT/VAF sensor, intake/fuel/ignition system, ECM |
| 26 | Mixture control -continuously rich | Wiring, injector, fuel system, cold start injector, H02S, ECT/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 | 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 relay, 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 |
| 53 | Knock control -malfunction | ECM |
| 71 | Exhaust gas recirculation (EGR) system malfunction | Hose leak/blockage, wiring, EGRT sensor, EGR solenoid, ECM |