Chart 2

Diagnostic Chart (Part 2 Of 4):

Schematic:

NO RPM DETECTED
The crankshaft position (CKP) sensor produces an AC voltage of different amplitude and frequency once the crankshaft velocity exceeds 60 RPM. The crankshaft has 7 total machined notches, 6 of which are spaced 60° apart. The remaining tooth is 10° before the #4 cylinder TDC notch. This extra notch is used by the PCM to determine the position of the top dead center #4 cylinder necessary to synchronize engine position. The CKP sensor is used for fuel delivery, spark timing and misfire diagnostics.

DIAGNOSTIC AIDS
An intermittent CKP signal may cause the engine to stall and set P1599.

RPM may dropout as a result of a loose CKP sensor or resistance value that sharply changes due to temperature differences.

If the CKP sensor is tight and resistance values under different temperatures are correct, the sensor is probably not at fault.

The voltage between circuit 573 and 574 measured at PCM J1 harness connector (disconnected) while the engine is cranking should be over 200 mV AC.