Connect GDS to Data Link Connector(DLC).

Ignition "ON"

Monitor "Diagnostic Trouble Codes(DTC)" with GDS.

Is DTC status displayed as Present?

	▶ Go to "Monitor GDS Data" procedure.
	▶ Go to "Verification of Vehicle Repair" procedure.

Ignition switch "OFF"

Connect VMI to GDS and set up the Oscilloscope.(4 Channel):

Channel A (+) : Pin No. 3 (CKPS Signal Plus) terminal (CKPS Harness Connector)

Channel A (-) : Pin No. 2 (CKPS Signal Minus) terminal (CKPS Harness Connector)

Channel B (+) : Pin No. 2 (CMPS Signal) terminal (CMPS Harness Connector)

Channel B (-) : Not used

Ignition switch "ON" % Engine "ON"

Inspection condition : Engine idle

Fig.1) CKPS & CMPS signal waveform under engine idle. ECM determines injection sequence and cylinder based on CKPS and CMPS signals.

When CMPS high signal voltage is decreased to 2.0V, ECM recognizes as low signal. Also, low signal voltage is increased to 3.8V, ECM recognizes as high signal. Low signal of CMPS does not reach 0.0V because of internal resistance of hall sensor.

When low signal of CMPS is over 0.6V, it might be indication of high resistance on CMPS or ground circuit.

Is the measured value within specification?

	▶ Fault is intermittent caused by poor contact in the sensor’s and/or ECM’s connector or was repaired and ECM memory was not cleared. 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.
	▶ Go to "Wiring Inspection" procedure.