Isuzu 1999 RODEO Workshop Manual page 801

6E1–174 RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
DTC P0171 – System Too Lean (Bank 1) (Cont'd)
Step
10 Perform the "Idle Air Control (IAC) Valve Check" and
correct any IAC problem as necessary.
Did this test isolate a problem requiring repair?
11 Check the fuel for excessive water, alcohol, or other
contaminants (see Diagnosis in Engine Fuel for the
procedure) and correct the contaminated fuel condition
if present (see Engine Fuel).
Was the fuel contaminated?
12 1. Visually and physically inspect the PCM injector
grounds, power grounds and sensor grounds to
ensure that they are clean, tight, and in their proper
locations.
2. If a faulty ground condition is present, correct it as
necessary.
Did your inspection reveal a condition requiring repair?
13 Perform the procedure in "Fuel System Pressure Test"
and repair fuel system problem if necessary.
Did the test isolate a condition requiring repair?
14 Perform the "Evaporative Emissions Control (EVAP)
Canister Purge Valve Check" and repair EVAP system
problem if necessary.
Did the test isolate a problem?
15 1. Visually and physically inspect the intake manifold,
injector O–rings, EGR adapter, EGR valve and the
EGR feed pipes for vacuum leaks.
2. Repair any problem that is found.
Did your inspection reveal a problem?
16 Visually and physically inspect the Bank 1 exhaust
manifold for leaks and loose or missing hardware and
correct any problem found.
Did your inspection reveal a problem?
17 Perform the "Injector Balance Test," and correct any
problem found (refer to Fuel Metering System).
Did the test isolate a problem?
18 1. Visually and physically inspect the Bank 1 HO2S 1
to ensure that it is installed securely and that the
Bank 1 HO2S 1 pigtail and wiring harness are not
contacting the exhaust or otherwise damaged.
2. If a problem is found, correct it as necessary.
Did your inspection reveal a problem?
Action Value(s) Yes
— Verify repair
— Verify repair
— Verify repair
— Verify repair
— Verify repair
— Verify repair
— Verify repair
— Verify repair
— Verify repair
No
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Refer to
Diagnostic
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