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1.

Many malfunctions in the electrical system are caused by poor harness and terminal conditions. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.

2.

Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.

3.

Has a problem been found?

	▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
	▶ Go to "W/Harness Inspection" procedure.

1.

IG "ON" & ENG "OFF"

2.

After connect GDS, select "Oscilloscope" mode.

3.

Measure signal waveform of CAN-High terminal of Data Link Connector and chassis ground.

4.

Measure signal waveform of CAN-Low terminal of Data Link Connector and chassis ground.

Specification : Refer to "Signal Waveform"

5.

Is the measrured signal waveform normal ?

▶ Go to next procedure.

▶ If the measured value is battery voltage, check short to battery in CAN line. Repair or replace as necessary. And then, go to "Verification of Vehicle Repair" procedure. In case that Communication is in sleep mode, 12V will be measured. Therefore, check that communication is in Wake up status.

▶ If 0V is detected, Check short to ground, short between CAN high and low each other or open in CAN high or CAN low harness. Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.

▶ Go to next procedure.

6.

IG KEY OFF.

7.

Disconnect TCCM, PCM connector.

8.

Measure resistance between communication line terminal of TCCM connector and communication line of PCM harness connector.

Specification : About below 1Ω

9.

Is the measured value within specification ?

▶ Check poor connection between harness connector and TCCM or PCM

: Thoroughly check the looseness, poor connection, bent, corrison, contamination, deformation or damage of connector. Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.

▶ Substitute with a known - good TCCM or PCM and check for proper operation.

If the problem is corrected, replace TCCM or PCM and go to "Verification of Vehicle Repair" procedure.

▶ Repair or replace open in CAN communication line and go to 'Verification of Vehicle Repair" procedure.