Troubleshooting

RENR2696-01 103
Troubleshooting Section
E. Use the override setting in the electronic service
tool in order to
engage the air inlet heater starting
aid.
F. Measure the vo
ltage 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 t
he repair has eliminated the problem.
STOP.
Te st Step 5. Ground the Input to the
Power Relay at the ECM connector
A. Turn the ign
ition 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 connec
t a 70 pin Breakout T.
D. Connect the electronic service tool to the
diagnosti
c 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
electroni
c 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 j
umper wire is connected the status of the
relay should be closed.
When the j
umper 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 th
at the problem has been eliminated.
If the repair has not eliminated the problem
proceed to tes
tstep6.
STOP.
Test Step 6. Override the Air Inlet H eater
Starting Aid in order to Test the E CM
A. Turn the igni
tion key switch to the OFF position.
B. Removethe70pinBreakoutT.
C. Connect the P1 ECM connector.
D. Connect the el
ectronic service tool to the
diagnostic connector.
E. Turn the keys
witch to the ON position.
F. Use the electronic service tool to monitor the
status scree
n.
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 t
he 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 Re
sult:
The air inlet heater starting aid is working properly.
Results:
•
OK – The ECM i
s 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 su
spect ECM, replace the suspect ECM.
Verify that the repair has eliminated the problem.
STOP.