Pontiac Fiero 1988 Service Manual page 1014

C R U I S E COli
¥ 6 VIN 9
30
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F: S P S C I R C U I T OPEN T E S T
If you are testing with a digital voltmeter and
you measured less than 15 ohms, perform Test
N. Otherwise, proceed to the following action:
• Remove the connector from the Cruise Con-
trol Servo. Measure the resistance between
terminals B and D of the servo.
— If it is more than 25 ohms, replace the
servo.
— If it is less than 25 ohms, check for an open
in the LT BLU/BLK (399) wire between
terminal H of the Cruise Control Module
and terminal D of the Cruise Control
Servo. Check for an open in the TAN (398)
wire between terminal F of the module and
terminal B of the servo.
G : S C C I R C U I T OPEN T E S T
Disconnect C235 and check the switch con-
tinuity between terminals B and D of the male
half with the Set Switch pressed.
• If the switch is open, replace the Multi-Func-
tion Lever.
• If the switch is not open, check for an open in
the DK BLU (84) wire between terminal D of
connector C235 and terminal L of the module.
H B V A C C I R C U I T S H O R T T E S T
Remove the connector from the Cruise Control
Servo and measure the resistance between ter-
minals C and E of the Cruise Control Servo.
• If it is less than 30 ohms, replace the servo.
• If it is 30 ohms or more, check for a short to
ground in the wire from terminal K of the
module to terminal E of the servo.
I: R/A C I R C U I T OPEN T E S T
Disconnect C235 and check switch continuity
between terminals A and C of the male half with
the Cruise Switch in R/A.
• If the switch is open, replace the Multi-Func-
tion Lever.
• If the switch is not open, check for an open in
the GRY/BLK (87) wire between terminal C
of connector C235 and terminal M of the
Cruise Control Module.
J : V E N T C I R C U I T S H O R T T E S T
Remove the connector from the Cruise Control
Servo and measure the resistance between ter-
minals A and C of the Servo.
• If it is less than 30 ohms, replace the servo.
• If it is 30 ohms or more, check for a short to
ground in the wire from terminal C of the
Cruise Control Module to terminal A of the
Cruise Control Servo.
K: V S S C I R C U I T OPEN T E S T
If the VSS light does not come on, or the volt-
age between terminals A and D remains less
than 7 volts, check for an open in the DK
GRN/WHT (389) wire from the Vehicle Speed
Sensor Buffer. Refer to p. 33-0 for diagnosis of
Vehicle Speed Sensor.
L: V S S C I R C U I T S H O R T T E S T
If the VSS light does not go off or battery volt-
age remains between terminals A and D, check
for a short to ground in the DK GRN/WHT
(389) wire from the Vehicle Speed Sensor
Buffer. Refer to p. 33-0 for diagnosis of Vehicle
Speed Sensor.
M: V A C U U M S Y S T E M T E S T
Connect: T E S T
LAMP
At: VACUUM RELEASE SOLENOID CON-
NECTOR (Disconnected)
Condition:
• Ignition Switch: ACCY
Connect
Between
Correct
Result
For
Diagnosis
Of Incorrect
Results
A (PPL)
& Ground
Test Lamp
lights
See 1
A (PPL)
& B (BLK)
Test Lamp
lights
See 2
• If both results are correct, go to Ml.
1. Check/adjust Cruise Brake Switch, and
check YEL/BLK, LT GRN/BLK, and
PPL (943) wires for an open.
2. Check BLK (150) wire for an open.
M1. Check for a blocked or leaking vacuum
source. If the vacuum source is good, plug the
Vacuum Release Port and repeat Test 6 of the
Isolation Test.
• If the vacuum now holds the throttle open,
replace or repair the Vacuum Release Sole-
noid or the hose to it.
• If the test still fails, replace the Cruise Con-
trol Servo.
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