Many malfunctions in the electrical system are caused by poor harness(s) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
Check the following conditions:
Check for damaged harness and terminals: contact resistance, oxidation, bent or broken terminals.
Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection
Use a suitable male pin to ensure that contact in sockets is good. The pin should remain in position when pulled gently.
Has a problem been found?
YES
Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO
Check for poor connection between PCM and component: backed out terminal, improper mating, broken locks and poor terminal to wire connection
System OK
CHECK REFERENCE VOLTAGE
Turn ignition switch to ON and disconnect VEHICLE SPEED SENSOR connector
Measure voltage between terminal 3 of the VEHICLE SPEED SENSOR harness connector and chassis ground
Specification : Approximately 5 V
Is voltage within specification ?
YES
Go to "Power circuit inspection" of "W/Harness Inspection" procedure
NO
Repair open or short in harness and Go to "Verification of Vehicle Repair" procedure
If harness is OK, Go to "TCM inspection" of the Component Inspection procedure
Turn ignition switch to ON and disconnect VEHICLE SPEED SENSOR connector
Measure voltage between terminal 1 of the VEHICLE SPEED SENSOR harness connector and chassis ground
Specification : Approximately B+
Is voltage within specification ?
YES
Go to "Ground circuit inspection" of "W/Harness Inspection" procedure
NO
Repair open or short to ground in harness and Go to "Verification of Vehicle Repair" procedure
Turn ignition switch to OFF and disconnect VEHICLE SPEED SENSOR connector
Measure resistance between terminal 2 of the VEHICLE SPEED SENSOR harness connector and chassis ground
Specification : Below 1 Ω
Does resistance indicate continuity?
YES
Go to "Component inspection" procedure
NO
Repair open in harness and Go to "Verification of Vehicle Repair" procedure
