TSB 08-22-97 Rev A
Inoperative Speed Control
Date: July 11, 1997
Supersedes TSB 08-22-97 Which should be removed from files. Battery
part numbers and hold down bolt torque specifications have been revised.
Models: 1996 and 1997 BR trucks
gas and diesel:
Speed control is inoperative or intermittent due to vacuum supply hose
that is loose, leaking, or deteriorated.
Perform the speed control diagnosis as outlined in the 97 service manual
page 8H-2. If the cause is a leaking vacuum hose at the speed control servo
located under the battery (s) due to battery acid on the servo hose, perform
the repair procedure.
Gasket, Battery temperature sensor
vacuum hose, V6, V8 Gas engine speed control
vacuum hose, diesel engine, V10 Gas engine speed control
Battery, 600 CCA
Battery, 810 CCA
a gasket between the battery tray and the battery temperature sensor (BTS) to
prevent battery acid from dripping onto the speed control servo vacuum hose,
replace the battery.
Detach the BTS pigtail connector with the plastic fastener (Christmas tree)
from the battery tray.
- Record Radio station presets
- Disconnect and isolate the negative battery cable(s).
- Disconnect the positive battery cable.
- Remove the battery hold down (Fig 1) and remove the battery from the vehicle.
Disconnect sensor pigtail harness from the engine wire harness.
Using a sharp pick or screwdriver, remove the plastic fastener (Christmas
tree) clip from the pigtail connector.
Remove BTS from the battery tray.
Remove the metal washer from the BTS and discard the washer.
Clean the area around the BTS attachment hole. Then remove the paper protector
from the adhesive of the BTS foam gasket and install the gasket onto the battery
tray, placing the adhesive side of the gasket on the battery tray.
Feed the sensor's pigtail harness through the mounting hole in the top
of the battery tray and press the sensor until it snaps into place.
Install the plastic fastener (Christmas tree) clip onto the pigtail harness.
Connect the pigtail harness and attach the plastic fastener (Christmas
tree) onto the battery tray.
Disconnect the speed control vacuum hose from the fitting at the engine.
Pull the speed control vacuum hose out of the mesh sheathing.
- NOTE: The washer reservoir must be removed on V10 and diesel
engines to gain access to the speed control servo. Refer to the 97 Service
manual page 8K-11 for the removal and installation of the reservoir.
Remove the speed control vacuum hose from the speed control servo.
Slide the new speed control vacuum hose through the mesh sheathing and
attach the nipple onto the fitting at the engine.
Position the new battery (replace the 600 CCA batteries and upgrade 740
CCA batteries to 810 CCA) in the tray. Ensure that the positive and negative
terminal posts are positioned correctly. The cable terminal clamps must
reach the battery posts without stretching the cables.
Loosely install the battery hold down hardware. Ensure that the battery
base is correctly positioned in the tray, then tighten the hold down bolts
to 35 in-lbs (4.2 Nm).
Install and tighten the battery positive cable terminal clamp. Then install
and tighten the negative cable(s). Tighten the cable terminal clamp bolts
to 75 in-lbs (8.5 Nm).
- NOTE: It may be necessary to remove the rubber nipple from the hose
to be able to slide the hose through the sheathing.
Reset the radio stations and clock.
- CAUTION: BE certain that the battery cables are connected to
the correct battery terminals. Reverse polarity will damage electrical components.
Set the radio frequencies to the stations recorded in step one and reset
- CAUTION: BE CERTAIN THAT THE BATTERY CABLES ARE CONNECTED TO THE CORRECT
BATTERY TERMINALS. REVERSE POLARITY MAY DAMAGE ELECTRICAL COMPONENTS.
POLICY: Reimbursable within the provisions of the warranty.
Labor Operation No: 4-20-20-91 .........0.5 Hrs.
FAILURE CODE: P8 - New Part
Thanks to Bob Bergevin and Barry Drodge for supplying this TSB information
This page was edited on: May 3, 2004