matthewtdean

I have a 94 Toyota 4Runner with the 3.0v6 VZE engine. Transmission is automatic and it is a 4wd. Just rebuilt and reinstalled the engine (valves done, new pistons, rings, rods, bearings, gaskets etc.... The check engine light comes on about 30 seconds after start up. Car runs well and when I scan it for codes my scanner comes back with "No DTC codes in Memory." I jumpered TE1 to E1 and got the following Check Engine light pulsing:

Long Pause - 1 blink - short pause - 2 blinks - short pause 5 blinks - long pause 2 blinks and then the pattern repeats ...

1 - 2 - 5 - 2
1 - 2 - 5 - 2

A little help on how to read these would be appreciated.

Other information: New knock sensor, new exhaust with headers, new muffler, new high flow catalytic, but includes all the california reed valve and egr valves (all hooked up appropriately and legally). New plugs, new wires, new rotor, new/remanufactured compressor, new/remanufactured Power Steering pump.

Idles great, runs strong

abecedarian

Your truck uses 2 digit trouble codes so I think you may be reading it wrong- there are no codes below 12, i.e. no code 10 or 11 for a 94 3VZE and none above 71. If those flashes you describe keep repeating the way you describe, they would be interpreted as 125 and 2. Neither of which are legit codes. So it would seem you have either one of the following: codes 12 and 52, or codes 21 and 25.

I'd think it more likely first scenario- codes 12 and 52, since the CEL illuminates within 30 seconds or so of starting the engine.
However, I cannot rule out the second scenario either, codes 25 and 21, since in that case both codes are associated with the O2 sensor.

Here is the break down of the codes:
12 - No NE or G signal input to ECU within 2 seconds of starting to crank the engine
52 - With engine speed above 1600 rpms, no knock sensor signal input to ECU for 6 consecutive crankshaft revolutions.
21 - Open or Short in O2 sensor heater circuit for more than 1/2 second, OR
... - With engine above 1500 RPM and speed below 60 miles per hour, O2 sensor output is reduced in amplitude to 0.35-0.7 volts for 60 seconds or longer.
25 - Air / Fuel mixture ratio lean.

jrlydy

what about code 22 its the ect sensor circuit and how do you fix the code 12 issue not getting a ne or g input ? im lost !