Perkins 1104E Series Troubleshooting Manual page 103

RENR2696-01
E. Use the override setting in the electronic service
tool in order to engage the air inlet heater starting
aid.
F. Measure the voltage between P20:43 air inlet
heater control and socket 69 NEG battery on the
Breakout T.
Expected Result:
The voltage is 0 volts when the air inlet heater
starting aid is engaged.
Results:
•
OK – Proceed to Test Step 5.
•
Not OK – The problem is in the wires between
the power relay for the air inlet heater starting aid
and the MIC.
Repair: Repair the harness or replace the harness.
Verify that the repair has eliminated the problem.
STOP.
Test Step 5. Ground the Input to the
Power Relay at the ECM connector
A. Turn the ignition key switch to the OFF position.
B. Remove the 70 pin Breakout T and reconnect
the P20 MIC.
C. Disconnect the P1 ECM connector from the ECM
and connect a 70 pin Breakout T.
D. Connect the electronic service tool to the
diagnostic connector.
E. Turn the keyswitch to the ON position.
F. Insert a jumper wire between J1:43 on the
Breakout T. Monitor the status screen on the
electronic service tool. Slowly connect and
disconnect the other end of the jumper wire to
socket 69 NEG battery on the Breakout T.
Expected Result:
When the jumper wire is connected the status of the
relay should be closed.
When the jumper wire is disconnected the status of
the relay should be open.
Results:
• OK – Proceed to Test Step 6.
•
Not OK – The problem is in the wire harness
between the MIC and the ECM connector.
Repair: Repair the damaged wire or replace the
wire. Verify that the problem has been eliminated.
If the repair has not eliminated the problem
proceed to test step 6.
STOP.
Test Step 6. Override the Air Inlet Heater
Starting Aid in order to Test the ECM
A. Turn the ignition key switch to the OFF position.
B. Remove the 70 pin Breakout T.
C. Connect the P1 ECM connector.
D. Connect the electronic service tool to the
diagnostic connector.
E. Turn the keyswitch to the ON position.
F. Use the electronic service tool to monitor the
status screen.
G. Use the override parameter for the air inlet heater
starting aid to override the following systems:
• Glow plug starting aid (if equipped)
•
Fuelled starting aid (if equipped)
H. Verify that the air inlet heater starting aid is either
"enabled" or "disabled".
I. Verify that the lamp for the air inlet heater starting
aid is on.
Expected Result:
The air inlet heater starting aid is working properly.
Results:
•
OK – The ECM is operating properly. STOP.
• Not OK – The ECM is not working properly.
Repair: Temporarily connect a test ECM. Remove
all jumpers and replace all connectors. The test
ECM should be programmed with the correct
software. All parameters should be set to the same
value of the suspect ECM.
If the problem is eliminated with the test ECM,
reconnect the suspect ECM. If the problem returns
with the suspect ECM, replace the suspect ECM.
Verify that the repair has eliminated the problem.
STOP.
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Troubleshooting Section