Suzuki GSX-R 1000 Service Manual: DTC “c15” (p0115-h/l): ect sensor circuit malfunction

Detected condition

Possible cause

0.15 V ≤ Sensor voltage < 4.85 V

• Ect sensor circuit open or short.
•  Ect sensor malfunction.
•  Ecm malfunction.
• Ect sensor circuit is open or ground circuit open.
• Ect sensor circuit shorted to ground.

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.

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

Step

Action

Yes

No

1

1. Turn the ignition switch off.
2.  Remove the left side cowling. Refer to “exterior parts removal and installation” in section 9d .
3.  Check the ect sensor coupler (1) for loose or poor contacts.

   If ok, then measure the ect sensor input voltage.

4. Disconnect the ect coupler and turn the ignition switch on.
5.  Measure the input voltage between the b/bl wire and ground.

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

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

Tester knob indication voltage ( )

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

Is the voltage ok?

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

Step

Action

Yes

No

1

1. Turn the ignition switch off.
2.  Remove the left side cowling. Refer to “exterior parts removal and installation” in section 9d .
3.  Check the ect sensor coupler (1) for loose or poor contacts.

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

4. Disconnect the ect sensor coupler.
5.  Disconnect the ecm coupler. Refer to “ecm removal and installation” in section 1c .
6.  Insert the needle pointed probes to the lead wire coupler.
7.  Check the continuity between the b/bl wire and terminal “32”. 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?

Step

Action

Yes

No

1

1. Turn the ignition switch off.
2.  Remove the left side cowling. Refer to “exterior parts removal and installation” in section 9d .
3.  Check the ect sensor coupler (1) for loose or poor contacts.

   If ok, then check the ect sensor lead wire continuity

4. Disconnect the ect sensor coupler.
5.  Check the continuity between the b/bl 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 ( )

6. Connect the ect sensor coupler.
7.  Insert the needle pointed probes to the lead wire coupler.
8.  Turn the ignition switch on.
9. Measure the output voltage between the b/bl wire and ground.

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

Tester knob indication voltage ( )

Ect sensor output voltage 0.15 – 4.85 V ((+) terminal: b/bl – (–) terminal: ground)

Are the continuity and voltage ok?

• B/bl wire shorted to ground.
•  If wire is ok, go to step 2.

2

1. Turn the ignition switch off.
2.  Disconnect the ect sensor coupler.
3.  Measure the ect sensor resistance.

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

Tester knob indication resistance (Ω)

Ect sensor resistance approx. 2.45 KΩ at 20 °c (68 °f) (terminal – terminal)

Is the resistance ok?

• B/bl or b/br wire open or shorted to ground, or poor “32” 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 .

Refer to “ect sensor removal and installation” in section 1c .