Test Coolant temperature sensor Flash code: 7x short Fault indication: Fault indicated by steady light at EDC indicator lamp Fault path: Coolant temperature sensor Effect of fault: The substitute value provided in the control unit for such cases results in a reduction in power output An increased quantity of white smoke may be discharged during cold start Possible cause: Line break, short-circuit, temperature sensor defective, control unit defective, failure or contamination of cooling system Test precondition:
EDC control unit disconnected / connected Socket box connected 44 Test Measurement Corrective measures Sensor resistance (control unit disconnected) Measure resistance at socket box across pin 53 and pin 13 Setpoints: 1.3–3.6 KΩ at 15–30°C 230–460 Ω at 75–80°C – Check lines – Check plug connections – Replace temperature sensor – If no fault found, replace control unit Sensor voltage (control unit connected) Measure voltage at socket box across pin 53 and pin 13 Setpoint: 3.46–1.22 V at 30–90°C