Perkins NJ Series Troubleshooting Manual page 214

214
Troubleshooting Section
• There is an active diagnostic code or a recently
logged diagnostic code that is related to the
following:
•
0091-02 Throttle Position Sensor erratic,
intermittent, or incorrect
• 0774-02 Secondary Throttle Position Sensor
erratic, intermittent, or incorrect
Check that the software configuration on the
Electronic Control Module (ECM) is correct for a
multi-position throttle.
If the engine has an analog throttle with Idle Validation
Switch (IVS), then refer to Troubleshooting, "Idle
Validation Switch Circuit - Test".
The throttle switch provides the operator with the
ability to select the desired engine speed. The throttle
switch configuration may be selected between 0 to 4
switches. A multi-position rotary switch may be used.
The throttle switch is typically connected to the four
throttle inputs of the ECM. Each position generates
a specific ON/OFF pattern on the throttle inputs. A
diagnostic code is generated if a pattern that does
not correspond with any of the switch positions is
detected.
Once a diagnostic code is generated, the ECM
ignores the throttle input signals. The desired engine
speed is set to low idle if no alternative throttle is
detected.
Voltage at the throttle inputs to the ECM should be
13.8 ± 0.5 VDC when the throttle inputs are open.
The voltage should be less than 0.5 VDC when the
throttle inputs are closed.
Illustration 91
Schematic for the circuit for the throttle switch
SENR9982-01
g01245665