Spectrum 3.0L GM - Page 99

99
DTC 91 ETC TPS 1 Range
Step Action Value(s) Yes No
1
Did you perform the On-board diagnostics (OBD)
system check?
Go to Step
(2).
Go to On-
Board
Diagnostics
System
Check/
Malfunction
indicator
lamp.
2
 With the monitor connected, Key ON, read
both pedal position sensor voltages.
 See Pedal Position Voltage Table
 Slowly depress the pedal while observing the
monitor
Are the readings within the specifications and is
the sweep smooth without any glitches?
Intermittent
problem. Go
to Preliminary
and Intermit-
tent Checks.
If there is a
glitch in the
sweep, re-
place the
pedal position
sensor. Oth-
erwise, go to
Step (3).
3
 Check pedal position sensor
 Disconnect VIC 1
 Key ON, measure voltage from VIC 1 pins S
and R.
 Key ON, measure voltage from VIC 1 pins M
and L.
Is the voltage between 4.8 and 5.2 volts?
Go to Step
(5)
Go to Step (4)
4
 Key ON, measure the voltage from VIC 1
pins S and M to ground
Is the voltage between 4.8 and 5.2 volts?
Between 4.8
and 5.2V
Refer to the
vehicle wiring
diagram and
check ground
back to ECU,
repair as ne-
cessary.
Refer to the
vehicle wiring
diagram and
repair the
power supply
problem be-
tween here
and ECU.
Check for
possible ECU
5 volt prob-
lem. Refer to
codes 524260
and 524261
for diagnostic
aids.