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4JA1-TC/4JH1-TC ENGINE DRIVEABILITY AND EMISSIONS 6E–87 NO CHECK ENGINE LAMP (MIL) Circuit Description The check engine lamp should be illuminated and Diagnostic Aids An intermittent check engine lamp may be cased by a wire broken inside the insulation. Check for the • Inspect the ECM harness and connections for improper mating, broken locks, improperly formed or • If the engine runs OK, check for a faulty light bulb, an open in the check engine lamp driver circuit, or an • If the engine cranks but will not run, check for an open ECM ignition or battery feed, or a poor ECM to µP 1.25 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0.5 0.5 0.5 35 45 0.5 42 IC Stop Meter Ignition Check Imnobiliser Control Unit Butery 7 8 Engine |