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Diagnostic Procedure
NHEC0172
1 CHECK EXHAUST AIR LEAK
1. Start engine and run it at idle.
2. Listen for an exhaust air leak before three way catalyst (Manifold).
SEF099P
OK or NG
OK © GO TO 2.
NG © Repair or replace.
2 CHECK FOR INTAKE AIR LEAK
Listen for an intake air leak after the mass air flow sensor.
OK or NG
OK © GO TO 3.
NG © Repair or replace.
3 CHECK HEATED OXYGEN SENSOR 1 (FRONT) CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect corresponding heated oxygen sensor 1 (front) harness connector.
3. Disconnect ECM harness connector.
4. Check harness continuity between ECM terminal and HO2S1 (front) terminal as follows.
Refer to Wiring Diagram.
MTBL0609
Continuity should exist.
5. Check harness continuity between ECM terminal or HO2S1 (front) terminal and ground as follows.
Refer to Wiring Diagram.
MTBL0610
Continuity should not exist.
6. Also check harness for short to power.
OK or NG
OK © GO TO 4.
NG © Repair open circuit or short to ground or short to power in harness or connectors.
DTC P0171 (BANK 1), P0174 (BANK 2) FUEL INJECTION SYSTEM FUNCTION
(LEAN)
Diagnostic Procedure
EC-296
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