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.
Thoroughly check all connectors (and connections) for looseness, bending, corrosion, contamination, deterioration, and/or damage.
Has a problem been found?
![]() | ▶ Repair as necessary and then go to "Verification of Vehicle Repair" procedure. |
![]() | ▶ Go to "Power Circuit Inspection" procedure. |
Ignition switch "OFF"
Refer to "Shop Manual" and disconnect Throttle Body connector.
Ignition switch "ON"
Measure the voltage between Pin No. 2 (TPS Supply) terminal of Throttle Body harness connector and chassis ground.
Specification : Approx. 5 V
Is the measured value within specification?
![]() | ▶ Go to "Ground Circuit Inspection" procedure. |
![]() | ▶ Repair open or short in power circuit between Throttle Body and ECM and then go to "Verification of vehicle Repair" procedure. |
Ignition switch "OFF"
Disconnect battery (-) cable.
Refer to "Shop Manual" and disconnect Throttle Body connector.
Measure the resistance between Pin No. 1 (Ground) terminal of Throttle Body harness connector and chassis ground.
Specification : Approx. below 1 Ω
Re-connect battery (-) cable.
Ignition switch "ON".
Measure the voltage between Pin No. 2 (TPS Supply) terminal of Throttle Body harness connector and chassis ground.(A)
Measure the voltage between Pin No. 2 (TPS Supply) terminal and Pin No. 1 (Ground) terminal of Throttle Body harness connector.(B)
Specification : Difference in (A) and (B) is less than 200 mV
Is the measured value within specification?
![]() | ▶ Go to "Signal Circuit Inspection" procedure. |
![]() | ▶ Repair open or short in ground circuit between Throttle Body and chassis ground and then go to "Verification of vehicle Repair" procedure. |
Ignition switch "OFF"
Refer to "Shop Manual" and disconnect Throttle Body connector.
Ignition switch "ON"
Measure voltage between Pin No. 5 (TPS2 Signal) terminal of Throttle Body harness connector and chassis ground.
Specification : 0 V
Ignition switch "OFF"
Disconnect battery (-) cable.
Measure resistance between Pin No. 5 (TPS2 Signal) terminal and battery (+) terminal.
Specification : Infinite(∞) Ω
Is the measured value within specification?
![]() | ▶ Go to "Component Inspection" procedure. |
![]() | ▶ Repair open or short in signal circuit between Throttle Body and ECM and then go to "Verification of vehicle Repair" procedure. |