Idle Validation Switch Circuit - Test - Perkins 1106D Troubleshooting Manual

SENR9982
B. Disconnect the fuel rail pump solenoid from the
connector.
C. Measure the resistance between P2:26 and P2:25.
D. Measure the resistance between P2:25 and
voltage +.
E. Measure the resistance between P2:25 and the
voltage (-).
F. Measure the resistance between P2:26 and
voltage +.
G. Measure the resistance between P2:26 and
voltage (-).
Expected Result:
The resistance is greater than 20,000 Ohms.
Results:
•
OK – The harness has no short circuit to supply
or ground. The ECM is suspect. Proceed to Test
Step 8.
•
Not OK – The harness has a short circuit.
Repair: Repair the harness and connectors or
replace the faulty harness and connectors.
Reconnect the sensor connector P2.
Turn the keyswitch to the ON position.
Use the Perkins EST in order to perform the fuel
rail pump solenoid test.
Verify that the repair has eliminated the fault.
STOP.
Test Step 8. Check the ECM Function
A. Temporarily connect a test ECM. The test ECM
should be programmed with the correct software.
All parameters should be set to the same value of
the suspect ECM.
B. Replace all connectors.
C. Connect the Perkins EST to the diagnostic
connector.
D. Turn the keyswitch to the ON position.
E. Use the Perkins EST in order to monitor the status
screen.
F. Use the Perkins EST in order to perform the fuel
rail pump solenoid test.
G. Monitor the status screen on the Perkins EST.
Expected Result:
The fault is eliminated.
Results:
•
OK – If the fault is eliminated with the test ECM,
reconnect the suspect ECM. If the fault returns with
the suspect ECM, replace the ECM. Verify that the
repair eliminates the fault. STOP.
Idle Validation Switch Circuit
- Test
System Operation Description:
Use this procedure if another procedure has directed
you here. Use this procedure if any of the following
diagnostic codes are active:
• 91-02 Incorrect Throttle Switch inputs
•
774-02 Secondary Throttle Position Sensor data
erratic
The idle validation switch (IVS) may be installed. The
IVS is required for mobile applications. The IVS is
part of the analog throttle demand sensor. The IVS is
CLOSED when the low idle is set.
The analog throttle demand settings that are valid for
the IVS threshold are programmed into the Electronic
Control Module (ECM). Use the Perkins Electronic
Service Tool (EST) in order to display the analog
throttle demand settings.
If the IVS operates outside of the programmed range
then the engine speed may not respond to changes
in the throttle position for the suspect throttle.
The Perkins EST may be used for the following:
•
If necessary, reset the IVS threshold for an existing
IVS.
• If necessary, view the IVS change point and reset
the IVS thresholds when a new throttle assembly
is installed.
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Troubleshooting Section
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