Pontiac Fiero 1988 Service Manual page 699

6E3-C8-2 DRIVEABILITY AND EMISSIONS - FUEL INJECTION (PORT)
DIAGNOSIS
The diagnosis of the transmission/transaxle
converter clutch (TCC) system is covered in CHART
C-8A. If the electronic control module (ECM) detects a
problem in the vehicle speed sensor (VSS) system, a
Code 24 should set. In this case see Code 24 Chart.
If the ECM doesn't switch the TCC on when it
should,sensors such as coolant, speed, and throttle
position should be checked.
ON-CAR SERVICE
• See Section "7" for TCC Solenoid.
• See Section "8B" for VSS (IP mounted) and brake
system.
SHIFT LIGHT
DIAGNOSIS
The shift light circuit can be checked using
CHART C-8B.
ON-CAR SERVICE
• See Section "6E" to repair wiring problem.
• See Section "6E3-C1-5" if ECM is to be replaced.
PARTS INFORMATION
PART NAME GROUP
Sensor, Vehicle Speed . • • 9.761
Solenoid, TCC . . 4.122
Description
The purpose of the shift light is to provide a
display which indicates the optimum fuel economy
point for up shifting the manual transmission based
on engine speed and load. The display is a lamp on the
instrument panel. Activation of the ECM driver turns
the lamp on.