Toyota RAV4 manuals

Suzuki GSX-R 1000 Service Manual: DTC “c21” (p0110-h/l): iat sensor circuit malfunction

Detected condition and possible cause

Detected condition

Possible cause

C21 Output voltage is not with in the following range.

0.15 V ≤ Sensor voltage < 4.85 V

  • Iat sensor circuit open or short.
  •  Iat sensor malfunction.
  •  Ecm malfunction.
  • Iat sensor circuit open or ground circuit open.
  • Iat sensor circuit shorted to ground.
P0110 H Sensor voltage is higher than specified value.
L Sensor voltage is lower than specified value.

Wiring diagram

Suzuki GSX-R. Wiring diagram


Troubleshooting

Caution

when using the multi-circuit tester, do not strongly touch the terminal of the ecm coupler with a needle pointed tester probe to prevent terminal damage.

 

Note

after repairing the trouble, clear the dtc using sds tool. Refer to “use of sds diagnosis reset procedures” .

C21 (use of mode select switch)

Step

Action

Yes

No

1

  1. Turn the ignition switch off.
  2.  Lift and support the fuel tank. Refer to “fuel tank removal and installation” in section 1g .
  3.  Move the air cleaner box upward. Refer to “air cleaner box removal and installation” in section 1d (page 1d- 7).
  4.  Check the iat sensor coupler (1) for loose or poor contacts.

    If ok, then measure the iat sensor input voltage.


  1. Disconnect the iat sensor coupler and turn the ignition switch on.
  2.  Measure the input voltage between the dg wire terminal and ground.

    If ok, then measure the input voltage between the dg wire terminal and b/br wire terminal.

Special tool
(a): 09900–25008 (multi
circuit tester set)

Tester knob indication voltage ( )


Iat sensor input voltage 4.5 – 5.5 V ((+) terminal: dg – (–) terminal: ground, (+) terminal: dg – (–) terminal: b/br)


Is the voltage ok?

Go to step 2.
  • Loose or poor contacts on the ecm coupler.
  •  Open or short circuit in the dg or b/br wire.

P0110-h (use of sds)

Step

Action

Yes

No

1

  1. Turn the ignition switch off.
  2.  Lift and support the fuel tank. Refer to “fuel tank removal and installation” in section 1g .
  3.  Move the air cleaner box upward. Refer to “air cleaner box removal and installation” in section 1d (page 1d- 7).
  4.  Check the iat sensor coupler (1) for loose or poor contacts.

    If ok, then check the iat sensor lead wire continuity.


  1. Disconnect the iat sensor coupler.
  2.  Disconnect the ecm coupler. Refer to “ecm removal and installation” in section 1c .
  3.  Insert the needle pointed probes to the lead wire coupler.
  4.  Check the continuity between the dg wire and terminal “33”. Also, check the continuity between the b/br wire and terminal “35”.

Special tool
(a): 09900–25008 (multi
circuit tester set)
(b): 09900–25009
(needle-point probe set)

Tester knob indication continuity test ( )


Ecm couplers (harness side)


Is the continuity ok?

Connect the ecm coupler and go to step 2. Dg or b/br wire open.

P0110-l (use of sds)

Step

Action

Yes

No

1

  1. Turn the ignition switch off.
  2.  Lift and support the fuel tank. Refer to “fuel tank removal and installation” in section 1g .
  3.  Move the air cleaner box upward. Refer to “air cleaner box removal and installation” in section 1d (page 1d- 7).
  4.  Check the iat sensor coupler (1) for loose or poor contacts.

    If ok, then check the iat sensor lead wire continuity.


  1. Disconnect the iat sensor coupler.
  2.  Check the continuity between the dg wire and ground. If the sound is not heard from the tester, the circuit condition is ok.

Special tool
(a): 09900–25008 (multi
circuit tester set)

Tester knob indication continuity test ( )



  1. Connect the iat sensor coupler.
  2.  Turn the ignition switch on.
  3.  Insert the needle pointed probes to the lead wire coupler.
  4. Measure the output voltage between the dg wire and ground.

Special tool
(a): 09900–25008 (multi
circuit tester set)
(b): 09900–25009
(needle-point probe set)

Tester knob indication voltage ( )


Iat sensor output voltage 0.15 – 4.85 V ((+) terminal: dg – (–) terminal: ground)


Are the continuity and voltage ok?

Go to step 2.
  • Dg wire shorted to ground.
  •  If wire is ok, go to step 2.

2

  1. Turn the ignition switch off.
  2.  Remove the air cleaner box. Refer to “air cleaner box removal and installation” in section 1d .
  3.  Measure the iat sensor resistance.

Special tool
(a): 09900–25008 (multi
circuit tester set)

Tester knob indication resistance (Ω)

Iat sensor resistance approx. 2.58 KΩ at 20 °c (68 °f) (terminal – terminal)


Note

iat sensor resistance measurement method is the same way as that of the ect sensor. Refer to “ect sensor inspection” in section 1c .

Is the resistance ok?

  • Dg or b/br wire open or shorted to ground, or poor “33” or “35” connection.
  •  If wire and connection are ok, intermittent trouble or faulty ecm.
  •  Recheck each terminal and wire harness for open circuit and poor connection.
  •  Replace the ecm with a known good one, and inspect it again. Refer to “ecm removal and installation” in section 1c .
Replace the iat sensor with a new one. Refer to “iat sensor removal and installation” in section 1c (page 1c- 5).
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