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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 192 (Engine Control System Self-Diagnostics - 4 CYL (PZEV)) >> Diagnostic Tests >> DTC P0171: System Too Lean (Bank No. 1) & DTC P0172: System Too Rich (Bank No. 1) >> Diagnosis & Repair

Diagnosis & Repair

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For wiring diagram, see DTC P2195: OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK NO. 1 SENSOR NO. 1) & DTC P2196: OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK NO. 1 SENSOR NO. 1) . For diagnosis and repair, see Fig 1-Fig 10 . To switch hand-held tester mode, see RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. For testing of systems or components, see BASIC DIAGNOSTIC PROCEDURES - 4-CYL article or SYSTEM & COMPONENT TESTING - 4-CYLINDER article. To check the ECM, see PIN VOLTAGE CHARTS article. For ECM location, see ENGINE CONTROL MODULE LOCATION  under SELF-DIAGNOSTIC SYSTEM. For removal and installation of components, see REMOVAL & INSTALLATION - 4-CYLINDER article.

Fig 1: DTCs P0171 & P0172 Diagnostic Procedure (Active Test 1 Of 2)
G00234821Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: DTCs P0171 & P0172 Diagnostic Procedure (Active Test 2 Of 2)
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Fig 3: DTCs P0171 & P0172 Diagnostic Procedure (Steps 1-4)
G00234823Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 4: DTCs P0171 & P0172 Diagnostic Procedure (Steps 5-8)
G00234824Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 5: DTCs P0171 & P0172 Diagnostic Procedure (Step 9)
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Fig 6: DTCs P0171 & P0172 Diagnostic Procedure (Step 9 Cont. Step 10)
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Fig 7: DTCs P0171 & P0172 Diagnostic Procedure (Step 10 Cont. & Steps 11-15)
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Fig 8: DTCs P0171 & P0172 Diagnostic Procedure (Steps 16-17)
G00234828Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 9: DTCs P0171 & P0172 Diagnostic Procedure (Steps 18-19)
G00234829Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 10: DTCs P0171 & P0172 Diagnostic Procedure (Steps 20-22)
G00234830Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002