Test TC-157C: Intermittent Loss Of CMP Or CKP

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article.

If CMP sensor was just replaced, test is complete. Perform TEST VER-2A . If CMP sensor was not just replaced, go to next step.
Using scan tool, read engine RPM while wiggling CMP and CKP sensor wiring harness. If engine RPM changes while wiggling wiring harness, repair wiring harness where wiggling caused problem to appear. Perform TEST VER-2A . If engine RPM does not change while wiggling wiring harness, go to next step.
Using scan tool, read trouble codes. If scan tool displays INTERMITTENT LOSS OF CMP OR CKP DTC, trouble code was reset due to wiggling wiring harness. Repair wiring harness where wiggling caused trouble code to set. Perform TEST VER-2A . If scan tool does not display INTERMITTENT LOSS OF CMP OR CKP DTC, go to next step.
No problem has been found. If more wiring harness wiggle testing is desired to find possible problem, go to step 2) . If no more wiring harness wiggle testing is desired at this time, go to next step.
Condition to set trouble code is not present at this time. INTERMITTENT LOSS OF CMP OR CKP DTC sets if expected cam signal level disagrees with actual cam signal level. Possible causes are: open or shorted 8-volt supply circuit, open sensor ground, open or shorted signal circuit, excessive clearance between crankshaft sensor and crankshaft pulse ring, excessive clearance between camshaft sensor and target magnet, damaged target magnet, damaged crankshaft pulse ring, failed sensor, failed PCM or loose CMP or CKP sensor connectors. Go to next step.
Inspect all related wiring and connectors and repair as necessary. Perform TEST VER-2A . If no problems were found with wiring and connectors, see INACTIVE TROUBLE CODE CONDITION . Test is complete. Perform TEST VER-2A .