Diagnostic Procedure

Perform ON-BOARD DIAGNOSTIC II SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM. After performing OBD-II system check, go to next step.
If any DTC other than P1153 or P1154 sets, diagnose affected DTC before proceeding. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no other DTCs are set, start engine and allow it to idle. Operate vehicle within CODE ENABLE CRITERIA . On scan tool, monitor DTC information. If scan tool displays DTC P1134 FAILED THIS IGN, go to next step. If scan tool does not display DTC P1134 FAILED THIS IGN, check for an intermittent problem. See DIAGNOSTIC AIDS .
If DTC P1153 or P1154 is also set, go to step 9 . If DTC is not set, go to next step.
Check exhaust system for leaks. Check for leaking, misaligned or damaged gaskets. Check for loose or missing exhaust system nuts or bolts. If problem is found, repair or replace as necessary. After repair, repeat test starting in step 2 . If no problem is found, go to next step.
Check for misaligned, burned or corroded exhaust pipes. Check for leaks at exhaust manifolds. If problem is found, repair or replace as necessary. After repair, repeat test starting in step 2 . If no problem is found, go to next step.
Check that Bank-1 HO2S-1 is securely installed. Check for loose or corroded terminals or damage to wiring harness. If problem is found, repair as necessary. After repair is complete, see VERIFYING VEHICLE REPAIR under SELF-DIAGNOSTIC SYSTEM. If no problem is found, go to next step.
Turn ignition off. Disconnect Bank-1 HO2S-1 4-pin harness connector. Bank-1 HO2S-1 is located in right exhaust pipe. Turn ignition on. Using DVOM measure voltage between ground and Bank-1 HO2S-1 harness connector terminal No. 2 (White/Blue wire). See Figure . Measure voltage between ground and Bank-1 HO2S-1 harness connector terminal No. 4 (Orange/Blue wire). Voltage reading should be 3-4 millivolts at both terminals. If voltage is as specified, leave harness connector disconnected and go to next step. If voltage is not as specified, go to step 10 .
Using a fused jumper wire, jumper Bank-1 HO2S-1 harness connector terminals No. 2 (White/Blue wire) to ground and No. 4 (Orange/Blue wire) to ground individually. Using scan tool, observe Bank-1 HO2S-1 voltage parameter. Voltage should read 10 millivolts and jump to 450 millivolts when jumper is removed. If voltage parameter performs as specified, go to step 12 . If voltage parameter does not perform as specified, go to step 13 .
Replace affected HO2S. After repair is complete, see VERIFYING VEHICLE REPAIR under SELF-DIAGNOSTIC SYSTEM.
NOTE: Before replacing HO2S, check for fuel contamination, use of improper RTV sealant or engine oil and coolant consumption.
Turn ignition off. Disconnect ECM Red 80-pin harness connector E-22. ECM is located at left rear of engine compartment, near air filter housing. Check for damage to ECM pins or terminals. If a problem was found, repair as necessary. After repair is complete, see VERIFYING VEHICLE REPAIR under SELF-DIAGNOSTIC SYSTEM. If no problem was found, leave harness connectors disconnected and go to next step.
Check for and repair open, short to voltage or short to ground in HO2S signal circuits between HO2S and ECM. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If problem is found, repair as necessary. After repair is complete, see VERIFYING VEHICLE REPAIR under SELF-DIAGNOSTIC SYSTEM. If no problem is found, leave harness connectors disconnected and go to next step.
Replace Bank-1 HO2S-1. After repair is complete, see VERIFYING VEHICLE REPAIR under SELF-DIAGNOSTIC SYSTEM.
NOTE: Before replacing HO2S, check for fuel contamination, use of improper RTV sealant or engine oil and coolant consumption.
Replace and reprogram ECM. See POWERTRAIN CONTROL MODULE REPLACEMENT under POWERTRAIN CONTROL MODULE. Use scan tool to clear DTC and verify repair.