DTC P0140, P0160 [AJ] (VIN: JM0 LW10J300 301406-, JMZ LW69J7*# 307683-, JM8 LW28J**# 301514-, JM8 LW28A**# 301514- (Assumed))


DTC P0140 DTC P0160	HO2S (Rear, RH) circuit no activity detected HO2S (Rear, LH) circuit no activity detected
DETECTION CONDITION	• PCM monitors input voltage from HO2S (Rear) when the following monitoring conditions are met for above 32 s. if the input voltage from the front HO2S does not even exceed 0.55 V though the short term fuel trim is controlled up to 25% for 9.6 s, PCM determines that sensor circuit is not activated. MONITORING CONDITIONS - Drive mode 3 - Following conditions are met: • Engine speed is above 1,500 rpm. • Engine coolant temperature is above 70 °C {158 °F}. Diagnostic support note • This is an intermittent monitor (HO2S). • The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM. • PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle. • FREEZE FRAME DATA is available. • DTC is stored in the PCM memory.
POSSIBLE CAUSE	• HO2S (Rear) deterioration • HO2S heater (Rear) malfunction • Leakage exhaust system • Open or short to ground circuit between HO2S (Rear) terminal A and PCM terminal - For P0140: HO2S (Rear, RH) terminal A and PCM terminal 44 - For P0160: HO2S (Rear, LH) terminal A and PCM terminal 45 • Insufficient compression • Engine malfunction


STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED • Have FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS (HO2S related) been recorded?	Yes	Go to the next step.
1		No	Record FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS on repair order, then go to the next step.
2	VERIFY RELATED SERVICE INFORMATION AVAILABILITY • Check for related Service Information availability. • Is any related Service Information available?	Yes	Perform repair or diagnosis according to available Service Information. • If vehicle is not repaired, go to next step.
2		No	Go to next step.
3	VERIFY RELATED PENDING AND STORED DTCS Note • If fuel monitor DTC, DTC P0132, P0152 is retrieved, ignore it until P0140 or P0160 is fixed. • Turn the ignition switch off, then ON (Engine OFF). • Verify pending and stored DTCs using WDS or equivalent. • Is other DTC present?	Yes	Go to appropriate DTC troubleshooting procedures. (See DTC TABLE [AJ] (VIN: JM0 LW10J300 301406-, JMZ LW69J7# 307683-, JM8 LW28J# 301514-, JM8 LW28A*# 301514- (Assumed)).)
3		No	Go to next step.
4	IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA • Is DTC P0140 or P0160 on FREEZE FRAME DATA?	Yes	Go to next step.
4		No	Go to troubleshooting procedures for DTC on FREEZE FRAME DATA. (See DTC TABLE [AJ] (VIN: JM0 LW10J300 301406-, JMZ LW69J7# 307683-, JM8 LW28J# 301514-, JM8 LW28A*# 301514- (Assumed)).)
5	VERIFY CURRENT INPUT SIGNAL STATUS • Warm up engine. • Access O2S12 for P0140 or O2S22 for P0160 PID using WDS or equivalent. • Verify PID while racing engine at least 10 times (in PARK or NEUTRAL). • Is PID reading normal? - Above 0.55 V at least once during engine racing.	Yes	Go to step 8.
5		No	Go to next step.
6	INSPECT INSTALLATION OF HO2S (REAR) • Check if HO2S (Rear) is loosely installed. • Is sensor installed securely?	Yes	Go to next step.
6		No	Install sensor securely, then go to Step 10.
7	INSPECT GAS LEAKAGE FROM EXHAUST SYSTEM • Visually check if any gas leakage is found between exhaust pipe and HO2S (Rear). • Is there any gas leakage?	Yes	Repair or replace any faulty exhaust parts, then go to Step 10.
7		No	• Inspect the following harnesses for open or short to ground circuit, repair or replace harness if necessary. - HO2S (Rear, RH) terminal A (harness-side) to PCM terminal 44 (harness-side) - HO2S (Rear, LH) terminal A (harness-side) to PCM terminal 45 (harness-side) • Repair or replace harness if necessary. • If all items above are normal, replace faulty sensor. Then go to Step 10.
8	INSPECT SEALING OF ENGINE COOLANT PASSAGE Warning • Removing radiator cap when radiator is hot is dangerous. Scalding coolant and steam may shoot out and cause serious injury. • When removing radiator cap, wrap a thick cloth around and turn it slowly. • Remove radiator cap. • Implement procedure to bleed air from engine coolant, then run engine at idle. • Is there any small bubble, which makes engine coolant white at filling opening? Note • Large bubbles are normal since they are remaining air coming out from engine coolant passage.	Yes	Air gets in from poor sealing on head gasket or other areas between combustion chamber and engine coolant passage. Repair or replace faulty parts, then go to Step 10.
8		No	Go to next step.
9	INSPECT ENGINE COMPRESSION • Inspect engine compression. • Is it normal?	Yes	Go to next step.
9		No	Implement engine overhaul for repairs, then go to next step.
10	VERIFY TROUBLESHOOTING OF DTC P0140 or P0160 COMPLETED • Make sure to reconnect all disconnected connectors. • Turn the ignition switch to ON (Engine OFF). • Clear DTC from memory using WDS or equivalent. • Access RPM and ECT PIDs using WDS or equivalent. • Verify that ECT PID is reading above 70 °C {158 °F}. • Increase engine speed above 1,500 rpm (RPM PID reading) above 30 s. • Is PENDING CODE P0140 (HO2S (Rear, RH)) or P0160 (HO2S (Rear, LH)) present?	Yes	Replace PCM, then go to next step.
10		No	Go to next step.
11	VERIFY AFTER REPAIR PROCEDURE • Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE [AJ].) • Is there any DTC present?	Yes	Go to applicable DTC inspection. (See DTC TABLE [AJ] (VIN: JM0 LW10J300 301406-, JMZ LW69J7# 307683-, JM8 LW28J# 301514-, JM8 LW28A*# 301514- (Assumed)).)
11		No	Troubleshooting completed.