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

Suzuki GSX-R 1000 Service Manual / Engine / Engine general information and diagnosis / Diagnostic information and procedures / DTC “c15” (p0115-h/l): ect sensor circuit malfunction

Detected condition and possible cause

Detected condition			Possible cause
C15		Output voltage is not with in the following range. 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.
P0115	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” .

C15 (use of mode select switch)

Step

Action

Yes

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

If ok, then measure the ect sensor input voltage.

Disconnect the ect coupler and turn the ignition switch on.
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?

Go to step 2.

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

P0115-h (use of sds)

Step

Action

Yes

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

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

Disconnect the ect sensor coupler.
Disconnect the ecm coupler. Refer to “ecm removal and installation” in section 1c .
Insert the needle pointed probes to the lead wire coupler.
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?

Go to step 2.

B/bl or b/br wire open.

P0115-l (use of sds)

Step

Action

Yes

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

If ok, then check the ect sensor lead wire continuity

Disconnect the ect sensor coupler.
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 ( )

Connect the ect sensor coupler.
Insert the needle pointed probes to the lead wire coupler.
Turn the ignition switch on.
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?

Go to step 2.

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

Turn the ignition switch off.
Disconnect the ect sensor coupler.
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)

Note

refer to “ect sensor inspection” in section 1c for details.

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 .

Replace the ect sensor with a new one.

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

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