Question about 2003 Toyota ECHO

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Sensor Locations. Please describe to me the locations of the ATS and CTS sensors.

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  • PTRichie Sep 26, 2008

    Air temperature sensor & coolant temperature sensor. My car is a 2003 Toyota Echo.

  • ehenning3604 Oct 10, 2008

    I have a 2003 GMC Envoy and don't know where the sensor is located.

  • Toyota Ed May 11, 2010

    And, when you say ATS & CTS, exactly what are you looking for? Terminology changes from mfgr to mfgr. Thanks

  • Toyota Ed May 11, 2010

    I will need the particular make, model & year of the vehicle in question

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  • Toyota Master
  • 1,861 Answers

The Air Temperature Sensor is built into the Mass Air Flow Meter. It is located on the air intake tube, between the air filter box and the metal intake manifold, held on with 2 screws.

The Coolant Temp Sensor is located on the back side of the engine (closest to the firewall), closer to the driver side of the engine. It is close below the Csm Position Sensor, that is located on the cylinder head.

If you had problems with either, the DTC would be P-0115 for the CTS and P-0110 for the ATS.
Note that the ATS cannot be serviced alone, you would need to replace the MAF assembly.
Hope this helps

Posted on Sep 26, 2008

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12. Diagnostic System Check
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14. CTS circuit, out of range high
15. CTS circuit, out of range low
17. PCM fault, pullup resistor
19. 6x signal fault, no 6x signal between reference pulses
21. TPS circuit, out of range high
22. TPS circuit, out of range low
23. ATS circuit, out range low
24. VSS circuit, no signal
25. ATS circuit, out or range high
26. Quad Driver output fault
32. EGR system fault
33. MAP sensor circuit, out of range high
34. MAP sensor circuit, out of range low
35. IAC valve, rpm out of range
41A EST circuit open
41B EST circuit shorted
42A Bypass circuit grounded
42B Bypass circuit open
42C Bypass circuit shorted
41. EST bypass, open or shorted
42. EST bypass, open or shorted
43. ECS (knock sensor) circuit open or shorted
44. Oxygen sensor indicates system lean
45. Oxygen sensor indicates system rich
46. Power steering pressure switch circuit, open
49. Idle rpm out of limit high (vacuum leak)
51. PCM memory error
55. A/D converter error in PCM
81. ABS message fault (1993 vehicles with TCS)
82 PCM internal communication fault


Diagnostic Flags
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61. 6x signal fault
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71. Cooling system temperature high
72. Coolinng system temeprature low
73. CTS sensor unstable
74. CTS/transaxle temperatuer sensor ratio error
76. ATS sensor unstable
83. Low coolant (1993 only)

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