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
Go to "Ground Circuit Inspection" procedure
Ignition "OFF"
Disconnect TPS connector
Ignition "ON" & Engine "OFF"
Measure voltage between terminal 2 of the sensor harness connector and chassis ground
Specification : Approx. 0V
Is TPS voltage displayed near the specified value?
YES
Go to step "Signal Circuit Inspection" procedure
NO
Check the ground circuit for an open.
Repair as necessary and go to "Verification of Vehicle Repair" procedure
Ignition "ON" & Engine "OFF"
With connector still disconnected, measure voltage between terminal 3 of the sensor harness connector(C31) and chassis ground
Specification : Approx. 5V
Is TPS signal voltage near the specified value?
YES
Go to "Component Inspection" procedure
NO
Possibility of open or short to power in signal circuit.
- Specification : 0Ω
- Specification : Approx. 0V
Repair as necessary and go to "Verification of Vehicle Repair" procedure
