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3 CHECK HEATED OXYGEN SENSOR 1 (FRONT) CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect heated oxygen sensor 1 (front) harness connector and ECM harness connector.
SEF331VA
3. Check harness continuity between ECM terminal 50 and terminal 2.
SEF141V
Continuity should exist.
4. Check harness continuity between ECM terminal 50 (or terminal 2) and ground.
Continuity should not exist.
5. Also check harness for short to ground and short to power.
OK or NG
OK 䊳 GO TO 4.
NG 䊳 Repair open circuit or short to ground or short to power in harness or connectors.
4 CHECK FUEL PRESSURE
1. Release fuel pressure to zero.
Refer to EC-51.
2. Install fuel pressure gauge and check fuel pressure.
At idling:
When fuel pressure regulator valve vacuum hose is connected.
235 kPa (2.4 kg/cm
2
, 34 psi)
When fuel pressure regulator valve vacuum hose is disconnected.
294 kPa (3.0 kg/cm
2
, 43 psi)
OK or NG
OK 䊳 GO TO 6.
NG 䊳 GO TO 5.
5 DETECT MALFUNCTIONING PART
Check the following.
쐌 Fuel pump and circuit Refer to EC-576.
쐌 Fuel pressure regulator Refer to EC-52.
쐌 Fuel lines Refer to “ENGINE MAINTENANCE”, MA-19.
쐌 Fuel filter for clogging
䊳 Repair or replace.
DTC P0171 FUEL INJECTION SYSTEM FUNCTION
(LEAN SIDE)
KA24DE
Diagnostic Procedure (Cont’d)
EC-284
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