Troubleshooting

126 RENR2696-01
Troubleshooting Section
Test Step 7. Connect an Electronic
Service Tool and t he ECM to another
Battery.
Batteries give off flammable fumes which can e x-
plode.
To avoid injury or death, do not strike a match,
cause a spark, or smoke in the vicinity of a battery.
NOTICE
Do Not connect the Bypass Harness to the battery
until the 20 Amp in-line fuse has been removed from
the +Battery
line. If the fuse is not removed before
connection to the battery a spark may result.
A. Connect the b
attery wires from the bypass
harness of the electronic service tool to a different
battery that is not on the engine.
Expected Result:
The electro
nic service tool is operating correctly.
Results:
•
Yes
Repair: Perf
orm the following diagnostic
procedure:
Troublesho
oting, “Electrical Power Supply Circuit -
Te s t ”
STOP.
•
No
Repair: Perform the following repair:
1. Temporaril
y connect a test ECM.
Note: ThetestECMshouldbeprogrammedwiththe
correct sof
tware. All parameters should be set to the
same value as the suspect ECM.
2. Remove all
jumpers and reconnect all
connectors.
3. Recheck th
e system for active diagnostic codes.
4. Repeat the test step.
5. If the problem is resolved with the test ECM,
reconnect the suspect ECM.
6. If the problem returns with the suspect ECM,
replace the sus
pect ECM.
7. Verify that the repair eliminates the problem.
STOP.
i02293740
Digital Throttle P osit ion
Sensor Circuit - Test
System Operat
ion Description:
Use this procedure if another procedure has directed
you here. Use
this procedure if any of the following
diagnostic codes are active:
•
91-08 Thrott
le Demand Sensor abnormal signal
•
774-08 Throttle Demand Sensor No.2 abnormal
signal
•
41-03 8 Volt Sensor Power Supply, voltage more
than normal
•
41-04 8 Volt Sensor Power Supply, voltage less
than normal
The pedal mounted throttle position sensor provides
a throttle p
osition signal to the Electronic Control
Module (ECM). The pedal mounted throttle position
sensor is attached directly to the throttle assembly.
Foot or hand
operated versions of the throttle
assembly are available.
The pedal mo
unted throttle position sensor will
produce a duty cycle of 10 to 22 percent at low idle
and 75 to 90 percent when the accelerator pedal is
fully depr
essed.
The pedal mounted throttle position sensor will
produce a m
inimum duty cycle when the pedal is
released. The pedal mounted throttle position sensor
will produce a maximum duty cycle when the pedal
is fully d
epressed.
The pedal mounted throttle position sensor sends
apulsewi
dth modulated signal. The signal varies
with the throttle position. The signal is expressed as
a percentage.