Description

This vehicle equipped siemens EMS. ECM can`t ignite when CKP and CMP are faulty at the same time. Inspect the signal waveforms of CKP and CMP first. So, if they are normal, Go to "CKP+CMP signal is OK Inspection" procedure. Otherwise, go to "CKP+CMP signal is bad Inspection" procedure.

Diagnostic Procedure
1.

Connect a scantool to Data Link Connector(DLC).

2.

Select oscilloscope function on a scantool.

3.

Connect CH A,B to CKP & CMP sensor signal harness

caution

CH A : Terminal "2" of the CKP sensor connector

CH B : Terminal "2" of the CMP sensor connector

4.

Turn the ignition switch to the "START" position.

5.

Check CKP & CMP signal waveforms.

A.

Are CKP & CMP signal waveforms normal,

Go to "CKP+CMP signal is OK Inspection" procedure.

B.

Are CKP & CMP signal waveforms abnormal,

Go to "CKP+CMP signal is bad Inspection" procedure.

caution

■ Method of distinction between normal and abnormal CKP

1. Connect a scantool to Data Link Connector(DLC).

2. Select a current data function on scantool.

3. Monitor the "Engine speed" data on the scantool.

4. Turn the ignition switch to the "START" position.

▶ In a case of normal CKP, The "ENGINE SPEED" current data rises over about 200 rpm.

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