Chevrolet SS 2014 Bedienerhandbuch PDF herunterladen (Seite 7)

December 2013 7

Cylinder Out-of-

Round Diagnosis

Some 2014 Silverado 1500 and

Sierra 1500 trucks built prior to

August 13, 2013 may have a front

side door window belt molding re-

tainer bolt that is corroded.

Replace the bolt with part number

11515397. Apply Red Thread Ad-

hesive (P/N 89021297, U.S.; P/N

10953488, Canada) or equivalent to

the bolt threads.

Tighten the bolt to 27 lb.-in. (3 N-m).

Thanks to James Will

The 2014 CTS sedan features a center console electric cup holder cover. The

cover may become inoperative if the customer has pushed the cover up and over

the full open stop, where the cover is open and will not close.

Gently pull up and rearward at the same

time on the front of the cup holder

cover. Use a trim stick to gently pry up

the rear portion of the cover to lift the

rear edge up and over the full open stop.

This procedure should reposition the

door to the correct side of the stop and

allow proper operation.

Advise the customer not to use exces-

sive force while operating the cover.

Thanks to Stephen Jacob

On some 2014 Spark EV models (RPO EN0), the air conditioning may be inopera-

tive and/or the Service Vehicle Soon (SVS) MIL (resembles a car with an exclama-

tion mark in the middle) may be illuminated. A history DTC P0071 (Ambient Air

Temperature Sensor Performance) may be set.

Use GDS2 to capture any DTC Freeze

Frame or Failure Records prior to clear-

ing the DTCs. If DTC P0071 is current

(failed during the current key cycle), fol-

low the appropriate Service Information

diagnostics.

If the vehicle build date is before July

15, 2013 and the DTC is set in his-

tory, or there is an intermittent no

air conditioning concern, the Hybrid

Powertrain Control Module 2 (HPCM2)

software needs to be updated. Program

the K114B (HPCM2) software using

TIS2Web.

Thanks to Brian Ciaverella

Molding Retainer Bolt

Corrosion

Electric Cup Holder Cover

Operation

Inoperative Spark EV Air

Conditioning

During engine diagnosis of 2014 and prior

GM cars and trucks for engine oil consump-

tion, misﬁre, cylinder leakage or blow-by, an

engine block may be inspected for possible

cylinder bore damage, scoring or an out-of

round condition.

GM has not had an issue with cylinders

being machined out-of-round for any engine

family in recent history. When inspecting

the engine block to determine if the cylinder

bores are good, look for the following items.

TIP: The peak-to-valley speciﬁcation for

crosshatch is 0.65 – 2.8 microns. Any devia-

tion and the crosshatch will be gone. Even

if a cylinder is suspected of being oversize,

it can only be conﬁrmed by checking with an

air gauge at the engine plant.

• Cylinder damage or scoring – the

cylinder walls will contain grooves deep

enough to catch with a ﬁngernail.

• An out-of-round cylinder bore –

the cylinder will contain areas where the

crosshatch is missing or worn from dif-

ferent sections of the cylinder bore. If the

crosshatch is all the way around the bore

from top to bottom, the cylinder bore is

not out-of-round.

• Dirt intrusion – If the ﬁltering system

has been compromised, the engine will

wear out very quickly. Grit may be found

in the intake runners and the cylinder

bores may appear to be lightly sand

blasted. The crosshatch will be faint

without sharpness.

• Catalytic converter failure – If a

converter fails and the brick is broken,

the dust can be drawn back into the

engine. A block showing this type of

failure will have bores that look to be

sand blasted. Back cylinders will go ﬁrst

if caught early; otherwise, there will be

no crosshatch and the engine will need to

be replaced.

Thanks to Richard Renshaw

Out-of-round cylinder

Corroded molding retainer bolt

Electric cup holder cover

Service Vehicle Soon MIL

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