EG-539 ENGINE – 2JZ-GTE ENGINE TROUBLESHOOTING 7 Check each item found to be a possible cause of problem. Check each circuit found to be a possible cause of trouble according to the results of the check in 1 . The numbers int he table below show the order in which the checks should be done. Main heater oxygen sensor signal continues at 5.0 V | Main heater oxygen sensor signal is normal | Possible Cause | See page 2 | 7 | Injector circuit | EG-583 | 3 | Misfire | IG-21 6 | 4 | Valve timing | EG-33 | 1 | Air leakage | EG-261 1 | 2 | Fuel system | EG-568 5 | 8 | Characteristics deviation in mass air flow meter | EG-544 3 | 5 | Characteristics deviation in engine coolant temp. sensor | EG-530 4 | 6 | Characteristics deviation in intake air temp. sensor | EG-532 OK NG Repair or replace. 8 Check compression (See page EG-9). OK NG Repair or replace. 9 Does malfunction disappear when a good main heated oxygen sensor is installed? NG YES Repair main heated oxygen sensor. Check and replace engine control module.