Workshop Manual

6E–229
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0172 – Fuel Trim System Rich Bank 1 (Cont'd)
Step NoYesValue(s)Action
18 Replace the PCM.
IMPORTANT: The replacement PCM must be
programmed. Refer to On-Vehicle Service in
Powertrain Control Module and Sensors for
procedures.
And also refer to the latest Service Bulletin.
Check to see if the Latest software is released or not.
And then Down Load the LATEST PROGRAMMED
SOFTWARE to the replacement PCM.
Is the action complete?
— Verify repair —
19 1. Perform the “Injector Balance Test”.
2. If Injector Balance Test isolates a problem, repair as
necessary (refer to Fuel Metering System ).
Did the Injector Balance Test isolate a problem
requiring repair?
— Verify repair Go to Step 20
20 1. Remove and visually/physically inspect the Bank 1
HO2S 1 for silicon contamination. This will be
indicated by a powdery deposit on the portion of the
HO2S that is exposed to the exhaust stream.
2. If contamination is evident on the Bank 1 HO2S 1,
replace the contaminated sensors.
Did the sensor require replacement?
— Verify repair
Refer to
Diagnostic
Aids
21 1. Check the TP sensor mounting screws and tighten
or replace them as necessary if they are loose or
missing.
2. If the screws are OK, replace the TP sensor.
Is the action complete?
— Verify repair —
22 Replace the MAF sensor.
Is the action complete?
— Verify repair —