Pontiac Fiero 1988 Service Manual page 1012

ISOLATION T E S T
9. While cruising,
tap Cruise Switch
to R/A
Car speed should
increase 1 mph for
each tap, up to ten
taps, then system
may have to be reset
to a new speed
10. While cruising,
tap Set button
Car speed should
decrease by 1 mph
for each tap, until
25 mph is reached
when Cruise Con-
trol will not operate
11. Slide Cruise
Switch to OFF
Cruise Control
turns off
o Refer to System Diagnosis when a result is
not normal.
S Y S T E M DIAGNOSIS
V6
VIN
9
© Use the Isolation Test below to choose the
proper diagnostic tests.
® Tests follow the Isolation Test.
1. Do not press both the Set and R/A Switches
at the same time while the engine is running
and Cruise Control Servo is connected to the
Throttle.
2. If the Quick Checker displays a short light,
release the switches immediately. Shorts
can damage the Quick Checker.
Connect: QUICK CHECKER (J-34185, SPECMO QC-3 or EQUIVALENT) or VOLT-OHMMETER
At: CRUISE CONTROL MODULE CONNECTOR (Disconnected)
Conditions:
• Ignition Switch: RUN
• Test with Quick Checker (J-34185 or equivalent) or Digital Meter
• Do tests in the sequence listed
Test Condition
With
Quick Checker,
Correct
Response
Without Quick Checker,
Using a Digital Meter
For
Different
Response,
do Test
Test Condition
With
Quick Checker,
Correct
Response
Meter
Range
Connector
Terminals
Correct
Response
For
Different
Response,
do Test
1 Cruise Switch Off
200 ohms
J &
Ground
0 ohms B
1 Cruise Switch Off
All Lights Off
20
V D C
A & J 0 volts
A
1 Cruise Switch Off
All Lights Off
20
V D C
M & J 0 volts
A
2 Cruise Switch On
ON/OFF
Light On
20
V D C
A & J Battery voltage
B
2 Cruise Switch On
BRK Light On 20
V D C
G & J Battery voltage C
2 Cruise Switch On
VENT Light On 200 ohms C & J 30 to 55 ohms
D
2 Cruise Switch On
VAC Light On 200 ohms K & J 30 to 55 ohms E
2 Cruise Switch On
SPS Light On 200 ohms F & H 15 to 25 ohms F
2 Cruise Switch On
R/A Light Off 20
V D C
M & J 0 volts A
2 Cruise Switch On
SC Light Off 20
V D C
L & J 0 volts A
3 Cruise Switch On, Set
Switch pressed
SC Light On 20
V D C
L & J Battery voltage G
3 Cruise Switch On, Set
Switch pressed
VAC &
SHORT
Lights Off
200 ohms K & J 30 to 55 ohms H
4 Cruise Switch in R/A
ON/OFF
Light On
20
V D C
A & J Battery voltage A
4 Cruise Switch in R/A
R/A Light On 20
V D C M
& J Battery voltage
I
4 Cruise Switch in R/A
VENT &
SHORT
Lights Off
200 ohms C & J
30 to 55 ohms J
(Continued on next page)