W/Harness Inspection
1.

Many malfunctions in the electrical system are caused by poor harness and terminals.

Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.

2.

Thoroughly check all connectors (and connections) for looseness, bending, corrosion, contamination, deterioration, and/or damage.

3.

Has a problem been found?

▶ Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.

▶ CAN Communication check.

CAN Communication line check
■ CAN register and communication line inspection 1
1.

IG Key "OFF".

2.

Connect all kinds of modules like PCM, 4WD ECU, TCM, ABS connector etc.

3.

Measure registance between terminal 3 and 11 of diagnostic connector.

Specification : About 60 Ω

4.

Is the measured resistance within specification ?

▶ Check 4WD ECU connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.

▶ If the measured value is out of specification, repair or replace 120Ω CAN register(Inside of PCM and Cluster) and then, go to "Verification of Vehicle Repair" procedure.

▶ If the measured value is lower than 10Ω, repair or replace CAN High and CAN Low are short each other. And then, go to "Verification of Vehicle Repair" procedure.

▶ If the measured value is ∞ Ω, repair or replace the open in CAN High /CAN Low circuit. And then, go to 'Verification of Vehicle Repair" procedure.

▶ Go to next procedure.

■ CAN register and communication line inspection 2
5.

IG Key "OFF".

6.

Disconnect ECM connector.

7.

Measure registance between terminal 3 and 11 of diagnostic connector.

Specification : About 120 Ω

8.

Is the measured resistance within specification ?

▶ Go to next procedure.

▶ Substitute with a known-good "ECM, IPM" and check for proper operation. If the problem is corrected, replace "ECM, IPM" and then go to "Verification of Vehicle Repair" procedure.

CAN communcation line inspection
■ Check short to battery in CAN communication line.
1.

IG Key "OFF".

2.

Connect all kinds of modules like PCM, 4WD ECU, TCM, ABS connector etc.

3.

IG "ON".

4.

Measure voltage between CAN high terminal(

10.

Is the measured resistance within specification ?

▶ Check PCM, 4WD ECU and ABS ECM connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.

▶ Check short to battery in communication line. And then, go to 'Verification of Vehicle Repair" procedure.

▶ Check short to ground in communication line. And then, go to 'Verification of Vehicle Repair" procedure.

Яндекс.Метрика