3.
Has a problem been found?
 | ▶ Repair as necessary and then go to "Verification of Vehicle Repair" procedure. |
 | ▶ Go to "Ground Circuit Inspection" procedure. |
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 "Ground Circuit Inspection" procedure. |
Ignition switch "OFF"
Disconnect battery (-) cable.
Refer to "Shop Manual" and disconnect Engine Coolant Temperature Sensor connector.
Measure the resistance between Pin No. 1 (Ground) terminal of Engine Coolant Temperature Sensor harness connector and chassis ground.
Specification : Approx. below 1 Ω
Re-connect battery (-) cable.
Ignition switch "ON".
Measure the voltage between Pin No. 3 (Signal) terminal of Engine Coolant Temperature Sensor harness connector and chassis ground.(A)
Measure the voltage between Pin No. 3 (Signal) terminal and Pin No. 1 (Ground) terminal of Engine Coolant Temperature Sensor 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 Engine Coolant Temperature Sensor and chassis ground and then go to "Verification of vehicle Repair" procedure. |
Ignition switch "OFF"
Refer to "Shop Manual" and disconnect Engine Coolant Temperature Sensor connector.
Ignition switch "ON"
Measure the voltage between Pin No. 3 (Signal) terminal of Engine Coolant Temperature Sensor harness connector and chassis ground.
Specification : Approx. 5 V
Ignition switch "OFF"
Disconnect battery (-) cable.
Refer to "Shop Manual" and disconnect Engine Coolant Temperature Sensor connector.
Measure the resistance between Pin No. 3 (Signal) terminal of Engine Coolant Temperature Sensor harness connector and chassis ground.
Specification : Infinite (∞) Ω
Is the measured value within specification?
| ▶ Go to "Component Inspection" procedure. |
| ▶ Repair open or short in signal circuit between Engine Coolant Temperature Sensor and ECM and then go to "Verification of vehicle Repair" procedure. |
