Powertrain Controls - ECM/PCM

DTC 36 Chart 24X Signal Circuit Error ***Updated By TSB # 93-203-6E:

Ignition System Wiring Diagram:

***Updated BY TSB # 93-203-6E Dated MAY 1993


Circuit Description:

The 24X sensor is used to improve spark at engine speed up to approximately 2000 RPM.

DTC 36 will set if:

^ Engine running.
^ The ECM detects that six or more 24X crankshaft position sensor reference pulses have not occurred.
^ DTC 36 diagnostic is executed once per ignition cycle.

Test Description: Number(s) below refer to circled number(s) on the diagnostic chart.

1. The 24X signal RPM should be the same as engine speed up to approximately 2000 RPM at which time it stops. This test determines if the ECM is putting out a 24X signal.

2. This test determines if signal voltage is present up to the ECM.

3. This test determines if system voltage is present at the sensor input.

4. By applying system voltage to the 24X crankshaft position sensor pigtail circuit, pigtail and sensor integrity can be determined.

5. This test determines ground path continuity.

Diagnostic Aids:

An intermittent 24X signal error can be caused by poor connections. Ignition feed, reference low and the signal circuits should all be checked for poor connections.