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DTC P0320: No Crank Reference Signal At Pcm: Testing

  1. Turn ignition on. Using scan tool, read current CKP state while cranking engine. If scan tool displays current CKP state PRESENT, go to next step. If scan tool does not display current CKP state PRESENT, go to step  6.
    NOTE: The following step checks for any pulses generated on lab scope by the CKP sensor. With ignition on, no CKP sensor pulses should be generated.
  2. Locate PCM on left side of engine compartment, near front of battery. Backprobe lab scope lead to terminal No. 32 (Brown/Light Blue wire) at PCM C1 harness connector. Observe lab scope screen and turn ignition on. If any pulses were generated when ignition was turned on, replace CKP sensor. If no pulses were generated, go to next step.
    NOTE: The following step checks for any pulses generated on lab scope by the CMP sensor. With ignition on, no CMP sensor pulses should be generated.
  3. Turn ignition off. Disconnect lab scope. Backprobe lab scope lead to terminal No. 33 (Dark Blue/Gray wire) at PCM C1 harness connector. Observe lab scope screen and turn ignition on. If any pulses were generated when ignition was turned on, replace CMP sensor. If no pulses were generated, go to next step.
  4. Turn ignition off. Backprobe lab scope lead to terminal No. 32 (Brown/Light Blue wire) at PCM C1 harness connector. Observe lab scope screen and start engine. Wiggle wiring harness from CKP sensor to PCM while observing lab scope pattern. On 2.4L, CKP sensor is located on cylinder block, near oil filter. On 3.3L and 3.8L, CKP sensor is located on top of transaxle housing, above flywheel. On all models, if any irregularities in lab scope pattern occur while wiggling wiring harness, check wiring harness where wiggling caused irregularity in lab scope pattern. Repair wiring as necessary. If wiring harness is okay, replace CKP sensor. If there are no irregularities in lab scope pattern while wiggling wiring harness, go to next step.
  5. At this time, conditions for DTC to set do not exist or fault is an intermittent problem. Start engine and allow it to idle. Ensure engine is at normal operating temperature. Using scan tool, monitor parameters related to DTC while wiggling connectors and wiring harness. If value changes while wiggling connectors and wiring harness, repair connectors and wiring harness where wiggling caused value to change. If value does not change, review Freeze Frame data using scan tool. Attempt to duplicate condition that caused DTC to set. Check for any related technical service bulletins that may apply. Visually inspect related connectors and wiring harness. Repair connectors and wiring harness as necessary. See WIRING DIAGRAMS article. If no problems are indicated, test is complete.
  6. Turn ignition off. Disconnect CKP sensor. On 2.4L, CKP sensor is located on cylinder block, near oil filter. On 3.3L and 3.8L, CKP sensor is located on top of transaxle housing, above flywheel. On all models, turn ignition on. Measure voltage between ground and Brown/Pink wire at CKP sensor harness connector. If voltage is 7.5-8.5 volts, go to next step. If voltage is not 7.5-8.5 volts, go to step  15.
  7. Measure voltage between ground and Brown/Light Blue wire at CKP sensor harness connector. If voltage is 4.5-5.0 volts, go to next step. If voltage is not 4.5-5.0 volts, go to step  10.
  8. Turn ignition off. Disconnect PCM connectors. PCM is located on left side of engine compartment, near front of battery. Measure resistance of Dark Blue/Dark Green wire between CKP sensor harness connector and terminal No. 43 at PCM C2 harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Dark Blue/Dark Green wire.
  9. Turn ignition off. Remove CKP sensor. On 2.4L, inspect notches on crankshaft for damage or debris. Crankshaft contains 2 sets of notches ground into the No. 2 counterweight on the crankshaft. If notches on crankshaft are okay and no debris exists, replace CKP sensor. If notches on crankshaft are damaged or debris exists, repair or replace crankshaft as necessary. On 3.3L and 3.8L, inspect slot areas on flywheel, near starter ring for damage or debris. There are 3 sets of slot areas which contain 4 slots in each set. If slot areas on flywheel are okay and no debris exist, replace CKP sensor. If slot areas on flywheel are damaged or debris exists, repair or replace flywheel as necessary.
  10. Turn ignition off. Ensure CKP sensor and PCM connectors are still disconnected. Measure resistance between ground and Brown/Light Blue wire at CKP harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Brown/Light Blue wire between CKP sensor and PCM.
  11. Measure resistance of Brown/Light Blue wire between CKP harness connector and terminal No. 32 at PCM C1 harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Brown/Light Blue wire.
  12. Ensure ignition is off. Reconnect PCM connectors. Turn ignition on. Measure voltage between ground and Brown/Light Blue wire at CKP sensor harness connector. If voltage is 5 volts or less, go to next step. If voltage is more than 5 volts, repair short to voltage in Brown/Light Blue wire between CKP sensor and PCM.
  13. Turn ignition off. Disconnect PCM connectors. Ensure CKP sensor is still disconnected. Measure resistance between Brown/Pink and Brown/Light Blue wires at CKP sensor harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, Brown/Pink and Brown/Light Blue wires are shorted together. Repair wiring as necessary.
  14. At this time, PCM is assumed to be defective. Replace PCM. Program the new PCM. See PROGRAMMING .
  15. Turn ignition off. Disconnect PCM connectors. Measure resistance between ground and Brown/Pink wire at CKP harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Brown/Pink wire between PCM and CKP sensor.
  16. Measure resistance of Brown/Pink wire between CKP sensor harness connector and terminal No. 44 at PCM C2 harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Brown/Pink wire.
  17. Ensure ignition is off. Reconnect PCM connectors. Turn ignition on. Measure voltage between ground and Brown/Pink wire at CKP sensor harness connector. If voltage is 9.1 volts or less, go to next step. If voltage is more than 9.1 volts, repair short to voltage in Brown/Pink wire between CKP sensor and PCM.
  18. At this time, PCM is assumed to be defective. Replace PCM. Program the new PCM. See PROGRAMMING .
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