EG-437 ENGINE — 2JZ-GE ENGINE TROUBLESHOOTING 2 Check sub heated oxygen sensor heater. P Disconnect sub heated oxygen sensor connector. (See page EG–250) C Measure resistance between terminals 1 and 2 of sub heated oxygen sensor connector. OK Resistance: 11 — 16 Ω at 20°C (68°F) P11483 OK NG Replace sub heated oxygen sensor. 3 Check for open and short in harness and connector between EFI main relay and engine control module (See page IN–30). OK NG Repair or replace harness or connector. Check and replace engine control module. 4 Check voltage between terminal HT3 of engine control module connector and body ground. SST ECM A 36 HT3 FI6891 P Warm up engine to normal operating temperature. C Measure voltage between terminal HT3 of engine control module connector and body ground, when engine is idling and racing at 3,500 rpm. OK Voltage Idling 0 V Racing at 3,500 rpm 9 — 14 V NG OK Replace sub heated oxygen sensor. Check and replace engine control module. *: It is probable the oxygen sensor has deteriorated. Usually, this cannot be confirmed by visual inspection.