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DTC P0337 - CKP Sensor Circuit/Low Frequency

  1. Perform On-Board Diagnostic (OBD) System Check. See BASIC TESTING article. Read and record FREEZE FRAME and/or FAIL RECORDS data for each DTC set. Go to next step.
  2. Attempt to start engine. If engine starts and runs, go to next step. If engine does not start and run, see BASIC TESTING article.
  3. Using scan tool, clear DTC P0337. Start engine and allow it to idle for one minute. Read DTCs. If DTC P0337 resets, go to next step. If DTC does not reset, check for an intermittent problem. See TESTS W/O CODES article.
  4. Turn ignition off and disconnect CKP sensor. Turn ignition on. Connect a voltmeter between 5-volt reference and sensor ground terminals at harness connector. If reading is 5 volts, go to step 7). If reading is not as specified, go to next step.
  5. Using a voltmeter, backprobe between PCM harness connector 5-volt reference circuit and ground terminals. If reading is 5 volts, go to next step. If reading is not as specified, go to step 10).
  6. Check CKP sensor 5-volt reference circuit and ground circuit between CKP sensor and PCM for an open, short to ground or short to power. Repair as necessary. Retest system.
  7. Turn ignition off and disconnect PCM and CKP sensor harness connectors. Check for an open or short to ground in 58X reference circuit between CKP sensor connector and PCM harness connector. If a problem is found, repair as necessary. Retest system. If no problem is found, go to next step.
  8. Reconnect PCM and CKP sensor harness connectors. Using a voltmeter, measure voltage of 58X reference circuit at PCM harness connector while cranking engine. If reading about 2.5 volts, go to step 10). If reading is not as specified, go to next step.
  9. Inspect connections at CKP sensor. Repair connections as necessary. If connections are okay, replace CKP sensor. Retest system.
  10. Inspect connections at PCM. Repair connections as necessary. If connections are okay, replace PCM. Retest system.
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