Troubleshooting

RENR2696-01 65
Troubleshooting Section
When a fault is detected and the engine is above the
predetermined
safe speed, the engine will reduce
speed to the safe speed.
When a fault is
detected and the engine is below the
predetermined safe speed, the engine will match the
correct speed.
The throttle switch is ignored by the ECM until the
fault is repaired.
ThethrottleswitchwillalsobeignoredbytheECM
until the keyswitch has been turned to the OFF
position and
then back to the ON position.
Troubleshooting:
Proceed to “Test Step 1” if the engine is equipped
with a throttle switch.
Proceed to “Test Step 2” if the engine is equipped
with a throttle position sensor.
Test Step 1.
Perform the
following diagnostic procedure: “Throttle
Switch Circuit - Test”
Results:
•
OK – STOP.
Test Step 2.
Perform the
following diagnostic procedure: “Throttle
Position Circuit - Test”
Results:
•
OK – STOP.
i01798142
CID 0091 FMI 03 Thro ttle
Demand Sens
or Open Circuit
Or Shorted High
Conditions Which Generate This Code:
The ECM detects all of the following conditions:
•
The ECM has
been powered for at least 3 seconds.
•
The ECM reads a signal voltage that is above
normal.
System Response:
The ECM will log the diagnostic code. The diagnostic
codes may be viewed on the electronic service tool.
TheECMwillreturntheenginetolowidleortothe
predetermined safe speed while the diagnostic code
remains activ
e.
Possible Pe rformance Effect:
•
Low power
•
Reduced engin
e speed
Troubleshooting:
Perform the following diagnostic procedure: “Throttle
Switch Circuit - Test”
Results:
•
OK – STOP.
i01798143
CID 0091 FM I 0
4Throttle
Demand Sensor Shorted Low
Conditions Which G enerate This Code:
The ECM detects all of the following conditions:
•
The ECM has be
en powered for at least 3 seconds.
•
The ECM reads a signal voltage that is below
normal.
System Response:
The ECM will log the diagnostic code. The diagnostic
code may be viewed on the electronic service tool.
TheECMwillreturntheenginetothelowidleorto
the predetermined safe speed while the diagnostic
code remain
sactive.
Possible Pe rformance Effect:
•
Low power
•
Reduced eng
ine speed
Troubleshooting:
Perform the following diagnostic procedure: “Throttle
Position Sensor Circuit - Test”