“C12” (p0335) CKP sensor circuit malfunction (Suzuki Boulevard M109R)

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DETECTED CONDITION	POSSIBLE CAUSE
The signal does not reach ECM for 3 sec. or more, after receiving the starter signal.	Metal particles or foreign material being stuck on the CKP sensor and rotor tip. CKP sensor circuit open or short. CKP sensor malfunction. ECM malfunction.

Inspection

Step 1

• 1) Remove the right frame side cover. (9-5)
• 2) Remove the left frame lower side cover. (3-6)
• 3) Turn the ignition switch OFF.
• 4) Check the CKP sensor coupler for loose or poor contacts. If OK, then measure the CKP sensor resistance.

• 5) Disconnect the CKP sensor coupler and measure the resistance.

CKP sensor resistance: 190 - 290 Ω (Green - Blue)

• 6) If OK, then check the continuity between each terminal and ground.

CKP sensor continuity: ∞ Ω (Infinity)

• (Blue - Ground)
• (Green - Ground)

• 09900-25008: Multi-circuit tester set
• Tester knob indication: Resistance (Ω)

Are the resistance and continuity OK?

YES	Go to step 2.
NO	Replace the CKP sensor with a new one.

• 7) After repairing the trouble, clear the DTC using SDS tool. (5-26)

Step 2

• 1) Crank the engine a few seconds with the starter motor, and measure the CKP sensor peak voltage at the coupler.
• 2) Repeat the above test procedure a few times and measure the highest peak voltage.

• CKP sensor peak voltage: 1.5 V and more
• (- Green − + Blue)
• 09900-25008: Multi-circuit tester set
• Tester knob indication: Voltage

Is the voltage OK?

YES	G/W or G/BI wire open or shorted to ground. Loose or poor contacts on the CKP sensor coupler or ECM coupler (terminal 14 or 31). If wire and connection are OK, intermittent trouble or faulty ECM. Rcheck each terminal and wire harness for open circuit and poor connection. Replace the ECM with a known good one, and inspect it again.
NO	Inspect that metal particles or foreign material stuck on the CKP sensor and rotor tip. If there are no metal particles and foreign material, then replace the CKP sensor with a new one.

• 3) After repairing the trouble, clear the DTC using SDS tool. (5-26)

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Article about repair motorcycles «Suzuki Boulevard M109R» (2006-2025): «“C12” (p0335) CKP sensor circuit malfunction»: https://motoinstruction.ru/en/Suzuki/Boulevard/VZR1800/engine/injection/116476 <a href="https://motoinstruction.ru/en/Suzuki/Boulevard/VZR1800/engine/injection/116476">“C12” (p0335) CKP sensor circuit malfunction</a> - article about repair motorcycles «Suzuki Boulevard M109R» (2006-2025) from section «Fuel injection». [url=https://motoinstruction.ru/en/Suzuki/Boulevard/VZR1800/engine/injection/116476]“C12” (p0335) CKP sensor circuit malfunction[/url] - article about repair motorcycles «Suzuki Boulevard M109R» (2006-2025) from section «Fuel injection».