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OBD-104 On-Board Diagnostics _____________________________________________ 7 1. Connect a 3-amp fused jumper between the signal circuit 623 2. Observe the ECT sensor parameter with a scan tool. Is the ECT sensor parameter more than the specified value? 148°C (298°F) Go to Step 9 Go to Step 8 8 Test the signal circuit 623 (YL) of the ECT sensor for a high re- Did you find and correct the condition? Go to Step 15 Go to Step 12 9 Test the low reference circuit 624 (GY) of the ECT sensor for a Did you find and correct the condition? Go to Step 15 Go to Step 12 10 Test the ECT signal circuit 623 (YL) for a short to any 5-volt ref- Did you find and correct the condition? Go to Step 15 Go to Step 11 11 Test for an intermittent and for a poor connection at the ECT sen- Did you find and correct the condition? Go to Step 15 Go to Step 13 12 Test for an intermittent and for a poor connection at the engine Did you find and correct the condition? Go to Step 15 Go to Step 14 13 Replace the faulty ECT sensor. Did you complete the replacement? Go to Step 15 14 Replace the faulty ECM. Did you complete the replacement? Go to Step 15 15 1. Clear the DTCs with a scan tool. 2. Turn OFF the ignition for 30 seconds. 3. Start the engine. 4. Operate the vehicle within the Conditions for Running the Did the DTC fail this ignition? Go to Step 2 Go to Step 16 16 1. Using the Scan Tool select “Capture Info,” Review Info.” Are Go to the appli- cable DTC table. System OK. Step Action Value(s) Yes No |