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6E–76 4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6. The Tech2 parameters which is not within the typical 12. This vehicle is equipped with ECM which utilizes an On-Board Diagnostic (OBD) System Check Step Action Value(s) Yes No 1 1. Ignition “On”, engine “Off”. 2. Check the “CHECK ENGINE” lamp (MIL). Does the “CHECK ENGINE” lamp turn “On”? — Go to Step 2 Go to No CHECK ENGINE Lamp 2 1. Using the Tech 2, ignition “On” and engine “Off”. 2. Attempt to display “Data Display” with the Tech 2. Does the Tech 2 display engine data? — Go to Step 3 Go to Step 7 3 1. Using the Tech 2, ignition “On” and engine “Off”. 2. Select the “Miscellaneous Test” and perform the “Check Light” in “Lamps”. 3. Operate the Tech 2 in accordance with the Tech 2 instructions. Does the “CHECK ENGINE” lamp turn “Off”? — Go to Step 4 Go to CHECK ENGINE LAMP On Steady 4 Attempt to start the engine. — Go to Step 5 Go to Engine Cranks But Will Not Run 5 1. Using the Tech 2, ignition “On” and engine “Off”. 2. Select the “Read DTC Infor As Stored By ECU” in “Diagnostic Trouble Code”. 3. Are any DTCs stored? — Go to DTC Chart Go to Step 6 6 Compare typical scan data values displayed on the — Refer to SYMPTOM DIAGNOSIS Refer to TYPICAL SCAN DATA 7 Using the DVM and check the data link connector 1. Ignition “Off”, engine “Off”. 2. Check the circuit for open circuit. Was the problem found? — Repair faulty verify repair Go to Step 8 V 16 B-58 |