INSPECTION
Visually in spect t he ch arge air cooler for cracks,
holes, or damage. Inspect the tubes, fin s, an d welds
for tear s, breaks, or other dama ge. Replace the
charge air cooler if dama ge is found.
Pressur e test the char ge a ir cooler, usin g Ch arge
Air Cooler Tester Kit.
INSTALLATION
(1) In st all char ge air cooler to radiator (Fig. 3).
(2) Connect power steer ing cooler loop to charge
air cooler (Fig. 3).
(3) Connect charge air hoses (Fig. 3).
(4) In st all both radiat or trim pieces (Fig. 3).
(5) In st all front grille with front cross mem ber.
(6) In st all hea dlamp a ssem blies.
(7) In st all front bumper.
TURBOCHARGER
DESCRIPTION
The boost pressure vacuum solenoid is located
under the air filt er housing a nd is r espon sible for
turbo-ch arger boost pressu re. It generates a cont rol
vacu um in respon se to a PWM signal from th e ECM.
Vacu um is achieved by mixing the system va cuum
(from the vacuum pu mp) with at mospheric pressur e
to a certa in degree. The resu lting vacuu m is sen t to
the vacuum unit at th e tur bochar ger (Fig. 4).
OPERATION
The vacu um solenoid receives 12V from the ECM.
The ECM cont rols th e solen oid thr ough a PWM sig-
nal. Wh en th e solenoid receives a signa l it closes the
pa ssa ge to atm ospheric pr essu re. Th e subch amber is
no longer u nder atmospher ic pressure, it’s spring can
pu sh the diaphragm and valve downwards; th is
releases t he VAC du ct. Vacuum ca n now go from here
through the t hrottle h ole, filter s a nd out the con nec-
tion to the t urboch arger vacuum unit (Fig. 5).
Fig. 4 CHARGE PRESSURE VACUUM TRANSDUCER
1 - CONNECTION TO TURBOCHARGER VACUUM UNIT
2 - VENT
3 - SUPPLY FROM VACUUM PUMP
11 - 6 EX H AU S T S Y S T EM VA
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