TEST
ACTION
APPLICABILITY
1
NOTE: Check for contaminates that may have damaged the O2 Sensor:
contaminated fuel, unapproved silicone, oil and coolant.
Turn the ignition on.
With the DRBIII
t, read DTC’s.
Is the Good Trip counter displayed and equal to zero?
All
Yes
→
Go To
2
No
→
Go To
18
2
Warning: The fuel system is under a constant pressure (even with the engine
off). Before testing or servicing any fuel system hose, fitting or line, the fuel
system pressure must be released.
Install a fuel pressure gauge to the fuel rail.
Turn the ignition on.
With the DRBIII
t, actuate the ASD Fuel System test and observe the fuel pressure
gauge.
NOTE: Fuel pressure specification is 339.2 KPa +/- 34 KPa (49.2 psi +/- 5 psi).
Turn the ignition off.
Choose a conclusion that best matches your fuel pressure reading.
All
Below Specification
Go To
3
Within Specification
Go To
6
Above Specification
Test Complete.
Caution: Stop All Actuations.
3
Turn the ignition off.
Warning: The fuel system is under a constant pressure (even with the engine
off). Before testing or servicing any fuel system hose, fitting or line, the fuel
system pressure must be released.
Raise vehicle on hoist, and disconnect the fuel pressure line at the fuel pump module.
Install special 5/16 fuel line adapter tool #6539 or #6631 between disconnected fuel
line and the fuel pump module.
Attach a fuel pressure test gauge to the T fitting on tool #6539 or #6631.
Turn the ignition on.
With the DRBIII
t, actuate the ASD Fuel System test and observe the fuel pressure
gauge.
NOTE: Fuel pressure specification is 339.2 KPa +/- 34 KPa (49.2 psi +/- 5 psi).
Is the fuel pressure within specification?
All
Yes
→
Repair or replace fuel supply line as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
Go To
4
Caution: Stop All Actuations.
89
DRIVEABILITY - GAS
P0172-1/1 FUEL SYSTEM RICH —
Continued