Code 12 is a normal code when the engine is not running. it means there is no distributor reference. When this code flashes during the key cycle, it is normal.
Testimonial: "yes it was helpful I also have codes dtc-33 dtc-41 dtc-55 my check engine light is on what should I be looking for "
Code 33 = AC clutch relay circuit. An opened or shorted condition was detected in the AC relay circuit. This could be the relay itself, a fuse or the AC clutch wire or clutch assembly is defective. Check all connections before replacing anything.
Code 41 = Generator field not switching properly. This could be an open or short condition in the generator field control circuit. Test the battery voltage output of the alternator and verify the connections are clean and tight. Check fuses also. Replace the Atlernator if found that it is not be putting out correct voltage and Amperes while the engine is running.
Code 55 = End of message (codes)
Code 33 will NOT cause the check engine light to light.
Code 41 WILL always light the engine light.
Correction...Code 12 means direct battery input to the PCM (computer) was disconnected within the last 50 key cycles. Again, this code is ok and will go away after 50 key cycles.
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SOURCE: 1994 Toyota 4Runner V6 2.0 VZE Engine, Automatic,
that code is for rpm signal and possible causes are the distributor wire harness from dis. to ecu (engine computer) or ecm itself! do you have rpm tach working on the dash? if so it might have seen the fault for a few seconds and set the code if you don't have rmp tach then you need to diagnois the cuase by testing the signal out of the dis. then down the line! if you have any more question please ask. good luck
SOURCE: 1994 Toyota 4Runner V6 3.0 VZE Engine, Automatic,
With any trouble codes you can not get away with not trouble shooting to find out were the problem is at.
Connect white (test lead) and black (ground lead) wires that are branched from harness approximately eight inches from ECM. After leads are grounded, the "Check Engine" light will flash the diagnostic trouble codes. The DTC's are indicated by the flashing CEL.
FLASH, FLASH, pause, FLASH, FLASH, FLASH = Code 23.
If only one diagnostic trouble code is stored, the DTC will repeat continuously until test leads are disconnected. If more than one diagnostic trouble code is stored, each DTC will repeat three times, starting with the lowest, then proceed to the next DTC. After all DTC's have been displayed, the pattern will repeat.I-MARK 84-85
Connect male and female test leads taped into wire harness near ECM. After leads are connected, the "Check Engine" lamp will flash the trouble codes. The DTC's are indicated by the flashing CEL.
FLASH, FLASH, pause, FLASH, FLASH, FLASH = Code 23.
If only one diagnostic trouble code is stored, the DTC will repeat continuously until test leads are disconnected. If more than one diagnostic trouble code is stored, each DTC will repeat three times, starting with the lowest, then proceed to the next DTC. After all DTC's have been displayed, the pattern will repeat.
86-87 Impulse located near the ECM connector, is used to actuate the Engine Control Module (ECM) trouble code memory within the module. Two terminals (A and C) of this connector are used to activate the diagnostic trouble code system in the ECM. With the ignition switch turned On, engine Off, connect a jumper wire between terminals A and C. The "Check Engine" lamp will begin by flashing a DTC 12. DTC 12 = flash, pause, flash, flash. There will be a longer pause and a code 12 will repeat two more times. This code indicates the self-diagnostic system is operating. The cycle will then repeat until the engine is started or the ignition is switched Off. In most cases, DTC's will be checked with the engine running since no DTC's other than DTC 12 or 51 will be present without the engine running. Remove jumper wire from ALDL connector before starting engine. Reconnect jumper wire after engine is running.
Throttle Body Fuel Injection
The ECM test connection is located under the center console.
A built-in, self diagnostic system will identify problems in the throttle body fuel injection system. When a problem is detected, the diagnostic system will illuminate the "Check Engine" light.
When the engine is started, the Check Engine light should turn off.. If the light remains lit, the self diagnostic has detected a problem. To determine where the problem exists, ground the "Test" terminal of the connector with the ignition On, engine Off and watch the check engine light. Each DTC will flash three times (lowest to highest).
READING CODES USING MIL (CHECK ENGINE) LAMP
Be advised that the MIL or CHECK ENGINE light can only perform a limited number of functions and it is a good idea to have the system checked with a scan tool to double check the circuit function.
Fig. Fig. 2: Diagnostic trouble code chart (1 of 2)-1995-97 engines
Fig. Fig. 3: Diagnostic trouble code chart (2 of 2)-1995-97 2.0L engines
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