Question about 1991 Toyota Pickup

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Diag code information

Have codes 24, 31 , 41...

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  • Toyota Ed May 11, 2010

    DTC 24 is the Air Temperature Sensor or circuit (inside the airflow meter); short or open.



    DTC 31 is the Air Flow Meter Signal to the ECM failure



    DTC 41 is a short or an open circuit in the Throttle Position Sensor.



    What I would do: Inspect the wire connectors going to the air flow meter and the throttle position switch. If the connectors are good & clean, you are prob going to have to replace both the TPS and the air flow meter; neither unit can be taken apart to correct the internal faults from the DTCs that you have provided. Please feel free to comment back if you have any other questions.

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Go here:


http://memweb.newsguy.com/~gtfour/technicl.htm#Fault%20Codes

Posted on Dec 05, 2008

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Hello,

I hope this info helps.

NOTE: This is the only information provided by the manufacturer for clearing diagnostic trouble codes.

97511505


CLEAR MEMORY
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where warning light is flashing, connect the other DIAG. terminal (3) on terminal No. 2 for at least three seconds . After memory is cleared, normal warning light flashing rate resumes. (Warning light flashes every 0.6 seconds (ON-OFF operation.) Memory cannot be cleared if any problem exists.

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When the airbag system is in functioning condition, the airbag warning light will remain on for about 7 seconds and go out when the ignition switch is set to ON .

If there is any malfunction, the airbag warning light will either stay on or off continuously. In such cases, perform on-board diagnostic in accordance with the specified procedure to determine trouble codes.


  1. Turn ignition switch ON (with engine OFF ).
85091723



  1. Connect DIAG. terminal to No.2 terminal of diagnosis connector located inside lower cover.
  2. Check in accordance with the trouble code indicated by the AIRBAG warning light, and record the trouble codes.
  3. Turn the ignition switch "OFF " and remove the DIAG. terminal from No.2 terminal of diagnosis connector.
85091724


HOW TO READ TROUBLE CODES
The ABS lamp flashes a code corresponding to the faulty parts.

The long segment (1.2 secs on) indicates a "ten", and the short segment (0.3 secs on) indicates a "one".





NOTE: This is the only information provided by the manufacturer for clearing diagnostic trouble codes.

97511505


CLEAR MEMORY
After eliminating problem as per trouble code, clear memory as follows:

Make sure ignition switch is ON (and engine off). Connect one DIAG. terminal (1) on diagnosis connector (2) terminal No.1.

where warning light is flashing, connect the other DIAG. terminal (3) on terminal No. 2 for at least three seconds . After memory is cleared, normal warning light flashing rate resumes. (Warning light flashes every 0.6 seconds (ON-OFF operation.) Memory cannot be cleared if any problem exists.

After clear memory and then DIAG. terminals (1) and (3), extract from diagnosis connector (2)

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