Component Inspection

P0338 Crankshaft Position Sensor A Circuit High Input

Inspection/Repair - Component Inspection

Component Inspection

1. Check CKPS
(1) Key "ON". (Don't disconnect sensors.)
(2) Select "vehicle scopemeter" in the menu, and connect channel A of scantool with terminal 1 of CKPS harness connector.
(3) Engine start. And check the signal waveforms.
A. Specification :




(4) Is the measured signal waveform O.K?
YES
1) Go to "Check ECM" as follows
NO
1) Substitute with a known - good CKPS and check for proper operation.
If the problem is corrected, replace CKPS and go to "Verification of Vehicle Repair" procedure.
2. Check ECM
(1) IG "OFF".
(2) Connect scantool and Engine "ON".
(3) Select simulation function on scantool.
(4) Simulate frequency (Hz) at terminal 1 of CKPS signal connector.




(5) Does the signal value of CKPS change according to simulation frequency?
YES
1) Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.
NO
1) Substitute with a known - good ECM and check for proper operation.
If the problem is corrected, replace ECM and go to "Verification of Vehicle Repair" procedure.

CAUTION:
There is a memory reset function on scantool that can erase optional parts automatically detected and memorized by PCM.
Before or after testing PCM on the vehicle, use this function to reuse the PCM on the others