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4 CHECK FUEL PRESSURE
1. Release fuel pressure to zero. Refer to EC-49.
2. Install fuel pressure gauge and check fuel pressure. Refer to EC-49.
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 © GO TO 6.
NG © GO TO 5.
5 DETECT MALFUNCTIONING PART
Check the following.
I Fuel pump and circuit (Refer to EC-618.)
I Fuel pressure regulator (Refer to EC-50.)
I Fuel lines (Refer to MA-16, “Checking Fuel Lines”.)
I Fuel filter for clogging
© Repair or replace.
6 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 7.
NG © Check connectors for rusted terminals or loose connections in the mass air flow sensor
circuit or engine grounds. Refer to EC-152.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0171 (BANK 1), P0174 (BANK 2) FUEL INJECTION SYSTEM FUNCTION
(LEAN)
Diagnostic Procedure (Cont’d)
EC-297
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