Isuzu 2000 Trooper Workshop Manual page 1108

DTC P0175 – Fuel Trim System Rich Bank 2 (Cont'd)
Step
8 Inspect the MAF sensor inlet screen for damage or for
the presence of foreign objects which may partially
block air flow through the screen and correct any
problem found.
Did your inspection of the MAF sensor reveal a
condition requiring repair or replacement?
9 Start the engine and note the idle quality.
Is a low or unsteady idle being experienced?
10 1. Turn the ignition off and physically inspect the
throttle body bore, throttle plate, and IAC passages
for coking and foreign objects.
2. If a problem was found, repair as necessary.
Did your inspection reveal a condition requiring repair?
11 1. Disconnect the vacuum hose from the fuel pressure
regulator and inspect the hose for the presence of
fuel.
2. If fuel is present in the vacuum hose, replace the
fuel pressure regulator (refer to Fuel Metering
System ).
Did the fuel pressure regulator require replacement?
12 1. Ignition "ON," engine "OFF."
2. Monitor the TP Angle display on the Tech 2 while
slowly depressing the accelerator pedal.
Does the TP Angle display increase steadily and
evenly from minimum value at closed throttle to
maximum value at wide-open throttle?
13 1. Disconnect the MAF sensor electrical connector.
2. Operate the vehicle in "closed loop" while
monitoring the "BANK 2 L.T. FUEL TRIM" and
"BANK 2 S.T. FUEL TRIM" display on the Tech 2.
Did both values change to near the specified value?
14 1. Perform the "Fuel System Pressure Test."
2. If Fuel System Pressure Test isolates a problem,
repair as necessary (refer to Engine Fuel or Fuel
Metering System ).
Did the Fuel System Pressure Test isolate a condition
requiring repair?
15 1. Ignition "ON," engine "OFF."
2. Connect a test light between the harness connector
terminals of canister purge solenoid.
Is the test light on?
16 Check for short to ground in the wire (red/yel) between
the canister purge solenoid and PCM terminal S-7.
Was there a short to ground?
17 Repair the short to ground.
Is the action complete?
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Action Value(s) Yes
— Verify repair
— Go to Step 10
— Verify repair
— Verify repair
Minimum 8%
Maximum
Go to Step 13
92%
0% Go to Step 22
— Verify repair
— Go to Step 16
Go to Step 17
—
— Verify repair
6E–239
No
Go to Step 9
Go to Step 11
Go to Step 11
Go to Step 12
Go to Step 21
Go to Step 14
Go to Step 15
Go to Step 19
Go to Step 18
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