W/Harness Inspection

Engine Control
P1602 CAN Communication BUS with TCU (Timeout) - W/Harness Inspection

Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness(es) and terminals. 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?
YES
> Repair as necessary and go to "Verification of Vehicle Repair" procedure.
NO
> Go to "CAN High line Inspection" procedure

CAN High line Inspection

1. Check for Open in harness
[ With ABS ]
(1) Ignition "OFF".
(2) Measure resistance between terminals 7 of the ECM harness connector and 11 of the ABS control module harness connector
Specification : Approx. 0Ohms




(3) Is resistance within the specification?
YES
> Go to "Check for short to ground in harness" procedure
NO
> Repair as necessary and go to "Verification of Vehicle Repair" procedure.
[ Without ABS ]
(1) Measure resistance between terminals 7 of the ECM harness connector and 1 of the RESISTOR CAN harness connector
Specification : Approx. 0Ohms




(2) Is resistance within the specification?
YES
> Go to "Check for short to ground in harness" procedure
NO
> Repair as necessary and go to "Verification of Vehicle Repair" procedure.
2. Check for short to ground in harness
(1) Measure resistance between terminals 7 of the ECM harness connector and chassis ground
Specification : Infinite




(2) Is resistance within the specification?
YES
> Go to next step as below
NO
> Repair as necessary and go to "Verification of Vehicle Repair" procedure.
3. Check for short to battery in harness
(1) Ignition "ON" & Engine "OFF"
(2) Measure voltage between terminals 7 of the ECM harness connector and chassis ground
Specification : Approx. 0V




(3) Is voltage within the specification?
YES
> Go to "CAN Low Line Inspection" procedure
NO
> Repair as necessary and go to "Verification of Vehicle Repair" procedure.

CAN Low line Inspection

1. Check for Open in harness
[ With ABS ]
(1) Measure resistance between terminals 6 of the ECM harness connector and 10 of the ABS control module harness connector
Specification : Approx. 0V




(2) Is resistance within the specification?
YES
> Go to "Check for short to ground in harness" procedure
NO
> Repair as necessary and go to "Verification of Vehicle Repair" procedure.
[ Without ABS ]
(1) Measure resistance between terminals 6 of the ECM harness connector and 2 of the RESISTOR CAN harness connector
Specification : Approx. 0Ohms




(2) Is resistance within the specification?
YES
> Go to "Check for short to ground in harness" procedure
NO
> Repair as necessary and go to "Verification of Vehicle Repair" procedure.
2. Check for short to ground in harness
(1) Measure resistance between terminals 6 of the ECM harness connector and chassis ground
Specification : Infinite




(2) Is resistance within the specification?
YES
> Go to next step as below
NO
> Repair as necessary and go to "Verification of Vehicle Repair" procedure.
3. Check for short to battery in harness
(1) Ignition "ON" & Engine "OFF"
(2) Measure voltage between terminals 6 of the ECM harness connector and chassis ground
Specification : Approx. 0V




(3) Is voltage within the specification?
YES
> Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO
> Repair as necessary and go to "Verification of Vehicle Repair" procedure.