Perkins 1106D Troubleshooting Manual page 171

SENR9982
Results:
•
OK – The jumper wire is connected. The Perkins
EST displays the IVS state in the ON position. The
jumper wire is disconnected. The Perkins EST
displays the IVS state in the OFF position. The IVS
is suspect. Proceed to Test Step 6.
•
Not OK – The harness and/or the ECM are
suspect. Proceed to Test Step 5.
Test Step 5. Check the ECM function
A. Disconnect the P1 connector.
B. If the IVS 2 is suspect, temporarily remove
connector P1:45. If the IVS 1 is suspect,
temporarily remove P1:44.
C. Fabricate a jumper wire.
D. Turn the keyswitch to the ON position.
E. Install the jumper wire between the removed
connector pin on the P1 connector and P1:35.
F. Use the Perkins EST in order to monitor the IVS
status. Note the status of the IVS.
G. Disconnect the jumper wire.
H. Use the Perkins EST in order to monitor the IVS
status. Note the status of the IVS.
Expected Result:
When the jumper wire is installed, the IVS state on
the Perkins EST throttle status screen will display
the ON position.
When the jumper wire is disconnected, the IVS state
on the Perkins EST throttle status screen will display
the OFF position.
Results:
•
OK – When the jumper wire is connected, the
Perkins EST shows the IVS state in the ON
position. When the jumper wire is disconnected,
the Perkins EST shows the IVS state in the OFF
position .
Repair:
1. Inspect the harness between the ECM and IVS.
2. Locate the fault.
3. Repair the harness and/or replace the harness.
4. Verify that the repair has eliminated the fault.
STOP.
•
Not OK – The ECM is suspect.
Repair:
1. Temporarily connect a test ECM.
Note: The test ECM should be programmed with the
correct software. All parameters should be set to the
same value as the suspect ECM.
2. If the fault is eliminated with the test ECM,
reconnect the suspect ECM.
3. If the fault returns with the suspect ECM, then
the suspect ECM is faulty.
4. Replace the suspect ECM.
STOP.
Test Step 6. Check the Idle Validation
Switch (IVS) at the Sensor
A. Turn the keyswitch to the OFF position.
B. Disconnect the IVS.
C. Set the throttle to low idle.
D. Check the resistance of the IVS.
E. Set the throttle to high idle.
F. Check the resistance of the IVS.
Expected Result:
The IVS reading should be more than 20,000 Ohms.
The IVS reading should be less than 10 Ohms at
low idle.
Results:
•
OK – The IVS indicates the resistance that is
shown in the test. No fault is indicated at this time.
Recheck the harness for intermittent connections.
STOP.
•
Not OK – The IVS is not functioning correctly.
Repair: Replace the IVS or replace the throttle
demand sensor assembly. Refer to OEM manual
for information on the throttle demand sensor.
Check the IVS calibration.
Refer to Test Step 7.
• Verify that the repair has eliminated the fault. Clear
the logged diagnostic codes. – STOP.
171
Troubleshooting Section