DTC Troubleshooting

P2096, P2097 DIAGNOSIS PROCEDURE

Step	Action	YES	NO
1	Was "Engine and Emission Control System Check" performed?	Go to Step 2.	Go to ENGINE AND EMISSION CONTROL SYSTEM CHECK:J24B .
2	DTC check Check DTC. Is there DTC(s) other than P2096 and P2097?	Go to applicable DTC (s).	Go to Step 3.
3	HO2S signal check Turn OFF ignition switch and connect scan tool. Warm up engine to normal operating temperature and keep it at 2, 000 r/min. for 60 sec. Repeat racing engine (Depress and release accelerator pedal 5 to 6 times repeatedly to enrich and enlean A/F mixture). Check for HO2S output voltage displayed on scan tool. Does HO2S output voltage indicates approx. 0 V for a few seconds, then approx. 0.7 V?	Intermittent trouble. Check for intermittent, see INTERMITTENT AND POOR CONNECTION INSPECTION .	Go to Step 4.
4	Intake system and exhaust system for leakage check Check intake system and exhaust system for leakage. Are intake system and exhaust system in good condition?	Go to Step 5.	Repair or replace defective parts.
5	Fuel injectors and its circuit check Check each fuel injectors and its circuit, see FUEL SYSTEM INSPECTION . Is check result satisfactory?	Go to Step 6.	Repair or replace defective fuel injector or wire harness
6	HO2S signal circuit and ground circuit check Check HO2S signal circuit and ground circuit referring to Step 3 of DTC P0137/P0138 . Are they in good condition?	Go to Step 7.	Repair or replace defective wire harness.
7	HO2S heater circuit check Check HO2S heater circuit referring to Step 2 through 3 of P0037 and P0038 . Are they in good condition?	Go to Step 8.	Repair or replace defective wire harness.
8	HO2S heater check Check heater resistance of HO2S, see HO2S (HEATED OXYGEN SENSOR) ON-VEHICLE INSPECTION . Is HO2S heater in good condition?	Go to Step 9.	Replace HO2S.
9	A/F sensor signal circuit check Check A/F sensor signal circuit referring to Step 3 of DTC P0137/P0138 . Are they in good condition?	Go to Step 10.	Repair or replace defective wire harness.
10	A/F sensor heater circuit check Check A/F sensor heater circuit referring to Step 2 through 3 of P0031, P0032 . Are they in good condition?	Go to Step 11.	Repair or replace defective wire harness.
11	A/F sensor check Check for A/F sensor, see A/F (AIR FUEL RATIO) SENSOR ON-VEHICLE INSPECTION . Is check result satisfactory?	Go to Step 12.	Replace A/F sensor, see A/F (AIR FUEL RATIO) SENSOR, HO2S (HEATED OXYGEN SENSOR) REMOVAL AND INSTALLATION .
12	Engine mechanical systems check Check engine mechanical systems. Engine compression: COMPRESSION CHECK Valve clearance: VALVE CLEARANCE INSPECTION AND ADJUSTMENT Intake and exhaust valve: VALVE AND VALVE GUIDE INSPECTION Valve timing: CAMSHAFT AND TAPPET REMOVAL AND INSTALLATION Are check result satisfactory?	Go to Step 13.	Repair or replace defective parts.
13	Replace HO2S, see A/F (AIR FUEL RATIO) SENSOR, HO2S (HEATED OXYGEN SENSOR) REMOVAL AND INSTALLATION . Check DTC. Is DTC P2096 and P2097 still detected?	Substitute a known-good ECM and recheck.	End.