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4 CHECK FUEL PRESSURE
1. Release fuel pressure to zero. Refer to EC-56.
2. Install fuel pressure gauge and check fuel pressure. Refer to EC-56.
At idling:
Approximately 350 kPa (3.7 kg/cm
2
, 51 psi)
OK or NG
OK © GO TO 5.
NG © Follow the construction of “Fuel Pressure Check”, EC-56.
5 CHECK MASS AIR FLOW SENSOR
With CONSULT-II
1. Install all removed parts.
2. Check “MASS AIR FLOW” in “DATA MONITOR” mode with CONSULT-II.
2.0 - 6.0 g·m/sec: at idling
7.0 - 20.0 g·m/sec: at 2,500 rpm
With GST
1. Install all removed parts.
2. Check mass air flow sensor signal in MODE 1 with GST.
2.0 - 6.0 g·m/sec: at idling
7.0 - 20.0 g·m/sec: at 2,500 rpm
OK or NG
OK © GO TO 6.
NG © Check connectors for rusted terminals or loose connections in the mass air flow sensor
circuit or engine grounds. Refer to EC-198.
DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
Diagnostic Procedure (Cont’d)
EC-272
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