Cruise Control - Trouble Shooting Hints
Number : 84-161Section: 9
Date : July, 1984
Subject: TROUBLE SHOOTING HINTS ON
1984 CUSTOM CRUISE III (K34)
Model and Year: 1984 CAPRICE, IMPALA, CAMARO, MONTE CARLO, CELEBRITY, EL CAMINO, CORVETTE, CAVALIER, AND CITATION
TO: ALL CHEVROLET DEALERS
CONDITION CAUSE
CORRECTION
Inoperative No power to module
Check fuse, brake and
System terminals "G" and "A".
clutch switches, turn
signal handle, pinched wires in steering column.
Open "ground" at
Repair ground circuit,
module terminal "J",
(run new ground if
servo terminal "C", necessary).
or VSS ground.
Open SPS circuit
Repair leads and/or
(module-servo leads
replace servo.
F-B, H-D or SPS coil
in servo).
Vac release valve
Adjust or replace
circuit open to
vacuum release valve, atmosphere.
check hoses, or repair
circuit.
No high and low volt- Check for open leads
age Signal at module or bad buffer amplifier
speed sender terminal or speedometer. Check
"D". ground and B+ input.
No 12 volt signal at
Check for open lead or
module "set/coast"
terminal "L". connector or bad turn
signal handle. Check for terminal in proper cavity.
CONDITION CAUSE CORRECTION
Inoperative No vacuum at small Check for plugged,
System hose to servo. pinched, disconnected
vac hoses, incorrectly positioned 3 way check valve, restricted engine vacuum fitting.
Cocked servo posi- Replace servo.
tion rod and spring.
Leaky servo and/or Replace servo.
inoperative valves.
Disconnected servo Reconnect
linkage.
Inoperative module. Replace module.
Vehicle Surges Excess slack in Adjust.
servo linkage.
Dry speedometer Lubricate.
cable.
Spikes on B+ lines. Find cause and repair.
Turn signal or other Reposition electrical
electrical device leads away from cruise
interference. or VSS buffer leaks.
Check for poor ground at module, servo, or VSS buffer.
Restricted (kinked Inspect hoses and re-
or leaking) vacuum position as required.
supply hose to accumulator or servo.
Crossed vac and vent Rewire.
electrical leads between module and servo.
Binding servo Bowdin Replace.
cable.
Torque converter Normal (not a cruise
clutch cutting in problem).
and out.
CONDITION CAUSE CORRECTION
Vehicle Surges Intermittent ground. Check for poor ground at
servo, module, VSS buffer. (Generally this is a common ground at the I.P. or servo.)
Servo valves stick- Replace servo.
ing.
Inoperative module. Replace module.
Cruise Set Speed Excess slack in Adjust.
High or Low servo linkage.
Incorrect module Make correction.
part number usage.
Inoperative module. Replace.
No Resume Incorrect operator Advise operator.
Function technique. (If R/A
held down for more than
1 second, system re-
verts to accel mode.
Speed at time of re-
lease is new cruise
speed.)
Open connection at Repair.
terminal "A" of module or terminal in wrong cavity.
No "Tap Down" Incorrect operator Advise operator.
Function technique. (Tap
down held down in
excess of .4
second.)
Incorrect module Make correction.
usage.
Vehicle Cruises Crossed vac and vent Rewire.
or Resumes wires.
Beyond Set
Speed Inoperative turn Replace.
signal mode control switch.
CONDITION CAUSE CORRECTION
Vehicle Cruises Sticking valves in Replace servo.
or Resumes Be- servo.
yond Set Speed
Binding throttle Make correction.
linkage.
Inoperative module. Replace module.
Incorrect module Make correction.
usage.
Inoperative speed Replace buffer.
sensor buffer.
Cruise Drops Out Inoperative module. Replace module.
While Tapping Down