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No RPM Detected Diagnosis

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  1. Turn ignition off. Disconnect PCM harness connector J2. Using a DVOM, check resistance between PCM harness connector J2 terminals No. 27 (Yellow wire) and No. 28 (Purple wire). See WIRING DIAGRAMS article. Resistance should be 500-900 ohms. If resistance is as specified, check Crankshaft Position (CKP) sensor for correct torque and terminal tightness. If okay, replace PCM. If resistance is less than 500 ohms, go to next step. If resistance is greater than 900 ohms, go to step  3.
  2. Disconnect CKP sensor harness connector. Check continuity between CKP sensor harness connector terminals. If continuity exists, check for shorted CKP sensor circuit between harness connector and PCM. If continuity does not exist, replace CKP sensor.
  3. Disconnect CKP sensor harness connector. Check continuity between CKP sensor harness connector terminals. If continuity does not exist, check circuits for open between harness connector and PCM. If continuity exists, check CKP sensor for correct torque and terminal tightness. If okay, replace CKP sensor.
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