KENR9126 177
Troubleshooting Section
Use the electronic service tool in order to clear all
logged diagnos
tic codes and then verify that the
repair has eliminated the fault.
STOP.
Test Step 7. Check the ECM and the
Harness
A. Turn the keyswitch to the OFF position.
B. Disconnect
the P532 connector from the fuel rail
pump solenoid.
C. Insert a jum
per wire across P532.
D. Turn the keyswitch to the ON position.
E. Use the electronic service tool in order to perform
the solenoid test for the fuel rail pump.
F. Use the electronic service tool in order to monitor
the status screen.
Expected Result:
A 1779-0
6 diagnostic code is displayed.
Results:
•
OK – The ECM and the ECM connections function.
The solenoid is not an open circuit. Recheck the
diagno
stic codes. Proceed to Test Step 5.
•
Not OK – The ECM is suspect. Proceed to Test
Step 8
.
Test Step 8. Check the E CM Function
A. Make sure that the latest fl ash file for the
application is installed in the ECM. Refer to
Trou
bleshoot ing, “Flash Programming”.
B. Contact the Technical Help Desk.
Note: This consultation can greatly reduce the repair
time.
C. If the Technical Help Desk recommends the
use of a test ECM, install a test ECM. Refer to
Tro
ubleshooting, “Replacing the ECM”.
D. Replace all connectors.
E. Use the electronic service tool to recheck the
system for active diagnostic codes.
F. Use the electronic service tool in order to perform
the solenoid test for the fuel rail pump.
Expected Result:
T
he fault is eliminated.
Results:
•
OK
Repair: If the
fault is eliminated with the test ECM,
perform the following procedure:
1. Reconnect th
e suspect ECM.
2. If the fault returns with the suspect ECM,
replace the
ECM.
3. Use the electronic service tool in order to clear
all logged d
iagnostic codes and then verify that
the repair eliminates the fault.
STOP.
•
Not OK
Repair: Repeat the diagnostic procedure from
Step 1.
STOP.
i03460880
Ignition Keyswitch Circuit and
Battery Supply Circuit - Test
System
Operation Description:
This procedure tests that the correct voltage is being
suppl
ied to the Electronic Control Module (ECM).
Use this procedure to troubleshoot the system when
one of
the following diagnostic codes is active or
easily repeated:
•
0168-
00 Electrical System Voltage high
•
0168-01 Electrical System Voltage low
•
0168-02 Electrical System Voltage erratic,
intermittent, or incorrect
•
1834-02 Ignition Keyswitch loss of signal
The
ECM receives electrical power (battery
voltage) through the wiring that is supplied by the
manufacturer of the application. Unswitched battery
vol
tage is supplied through P1: 7, 8, 15, 16. The
negative battery is supplied through P1: 1, 2, 3, 9, 10.
The ECM receives the input from the keyswitch at
P1
:40 when the keyswitch is in the ON position or in
the START position. When the ECM detects battery
voltage at this input, the ECM will power up. When
ba
ttery voltage is removed from this input, the ECM
will power down.
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