DTC “c13” (p0105-h/l): iap sensor circuit malfunction

Detected condition and possible cause

Detected condition			Possible cause
C13		Iap sensor voltage is not within the following range.

0.5 V ≤ Sensor voltage < 4.85 VNote

note that atmospheric pressure varies depending on weather conditions as well as altitude.

Take that into consideration when inspecting voltage.

• Clogged vacuum passage between throttle body and iap sensor.
• Air being drawn from vacuum passage between throttle body and iap sensor.
• Iap sensor circuit open or shorted to ground.
• Iap sensor malfunction.
• Ecm malfunction.

P0105 H Sensor voltage is higher than specified value

• Iap sensor circuit is open or shorted to vcc or ground circuit open.
• Iap sensor circuit is shorted to ground or vcc circuit open.

L Sensor voltage is lower than specified value. 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” .

C13 (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 Check the iap sensor coupler (1) for loose or poor contacts.

If ok, then measure the iap sensor input voltage.

1. 1
   Disconnect the iap sensor coupler.
2. 2
   Turn the ignition switch on.
3. 3
   Measure the input voltage between the r wire and ground.

If ok, then measure the voltage between the r wire and b/br wire. Special tool (a): 09900–25008 (multi
circuit tester set) Tester knob indication voltage ( )
Iap sensor input voltage 4.5 – 5.5 V ((+) terminal: r – (–) terminal: ground, (+) terminal: r – (–) terminal: b/br)

Is the voltage ok? Go to step 3.

• Loose or poor contacts on the ecm coupler.
• Open or short circuit in the r or b/br wire.

P0105-h for iap sensor (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 Check the iap sensor coupler (1) for loose or poor contacts.

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

1. 1
   Disconnect the iap sensor coupler.
2. 2
   Check the continuity between the r wire and g/b wire.

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 ( )

1. 1
   Disconnect the ecm couplers. Refer to “ecm removal and installation” in section 1c .
2. 2
   Insert the needle pointed probes to the lead wire coupler
3. 3
   Check the continuity between the g/b wire and terminal “19”.

If ok, then 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? Go to step 3. G/b wire shorted to vcc, or b/br wire open. P0105-l for iap sensor (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 Check the iap sensor coupler (1) for loose or poor contacts.

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

1. 1
   Disconnect the iap sensor coupler.
2. 2
   Check the continuity between the g/b wire and ground.

Also, check the continuity between the g/b wire and b/ br wire. 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 ( )

1. 1
   Disconnect the ecm couplers. Refer to “ecm removal and installation” in section 1c .
2. 2
   Insert the needle pointed probes to the lead wire coupler
3. 3
   Check the continuity between the r wire and terminal “7”. Also, check the continuity between the g/b wire and terminal “19”.

Special tool
(a): 09900–25008 (multi
circuit tester set)
(b): 09900–25009
(needle-point probe set) Tester knob indication continuity ( )
Ecm couplers (harness side)

Is the continuity ok? Go to step 2. R and g/b wire open, g/ b wire shorted to ground. 2

1. 1
   Connect the ecm couplers.
2. 2
   Turn the ignition switch on.
3. 3
   Measure the input voltage between the r wire and ground.

If ok, then measure the voltage between the r wire and b/br wire Special tool (a): 09900–25008 (multi
circuit tester set) Tester knob indication voltage ( )
Iap sensor input voltage 4.5 – 5.5 V ((+) terminal: r – (–) terminal: ground, (+) terminal: r – (–) terminal: b/br)

Is the voltage ok? Go to step 3.

• Loose or poor contacts on the ecm coupler.
• Open or short circuit in the r or b/br wire.

3

1. 1
   Turn the ignition switch off.
2. 2
   Connect the ecm couplers and iap sensor coupler.
3. 3
   Insert the needle pointed probes to the lead wire coupler.
4. 4
   Run the engine at idle speed and measure the iap sensor output voltage between the g/b wire and b/br wire.

Special tool
(a): 09900–25008 (multi
circuit tester set)
(b): 09900–25009
(needle-point probe set) Tester knob indication voltage ( )
Iap sensor output voltage approx. 2.7 V at idle speed ((+) terminal: g/b – (–) terminal: b/br)

Is the voltage ok?

Go to step 4.

• Check the vacuum hose for crack or damage.
• Open or short circuit in the g/b wire.
• If vacuum hose and wire are ok, replace the iap sensor with a new one. Refer to “iap sensor removal and installation” in section 1c .

4

1. 1
   Turn the ignition switch off.
2. 2
   Remove the iap sensor. Refer to “iap sensor removal and installation” in section 1c .
3. 3
   Connect the vacuum pump gauge to the vacuum port of the iap sensor.
4. 4
   Arrange 3 new 1.5 V batteries (1) in series (check that total voltage is 4.5 – 5.0 V) and connect (–) terminal to the ground terminal “b” and (+) terminal to the vcc terminal “a”.
5. 5
   Check the voltage between vout terminal “c” and ground. Also, check if voltage reduces when vacuum is applied by using vacuum pump gauge.

Special tool (a): 09917–47011 (vacuum
pump gauge set) (b): 09900–25008 (multi
circuit tester set) Tester knob indication voltage ( )

Is the voltage ok?

• G/b, r or b/br wire open or shorted to ground, or poor “19”, “7” 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 .

If check result is not satisfactory, replace the iap sensor with a new one. Refer to “iap sensor removal and installation” in section 1c .