Troubleshooting

RENR2696-01 171
Troubleshooting Section
Test Step 6. Check the Continuity of
the Cables From the ECM to the Fuel
Injection Pum
p
A. Turn the keyswitch to the OFF position.
B. Disconnect the J1/P1 ECM connector and the
J40/P40 fuel injection pump connector.
g00863550
Illustration 84
Fuel pum p power supply
C. Perform a continuity test between P40:8 fuel
injection pump connector and the following
terminals:
•
P40:1
•
P40:2
•
P40:5
•
P40:6
•
P40:7
Expected Result:
The continuity check is positive.
Results:
•
OK – There is a fault with the cables between the
fuel injection pump and/or the ECM.
Repair: Replace the cable.
Verify that the repair eliminates the problem.
STOP.
•
Not OK – The ECM is sus pect.
Repair: Verify that the repair eliminates the
problem.
1. Temporarily install a test ECM.
Note: The test ECM should be programmed with the
correct softwa
re. 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 re
turns with the suspect ECM, then
the suspect ECM is faulty.
4. Replace the su
spect ECM.
STOP.
i01798873
Engine Temperature S enso r
Open or Short
Circuit - Test
System Operation Description:
Usethisproc
edure under the following
conditions:
Use this proc
edure to troubleshoot the system only
when there is an active diagnostic code or when
a diagnostic code can easily be activated. This
procedure c
overs open circuit diagnostic codes and
short circuit diagnostic codes that are associated with
the following sensors:
•
Coolant temperature sensor
•
Intake mani
fold air temperature sensor
The following background information is related
to this proc
edure:
The troubleshooting procedures for the diagnostic
codes of ea
ch temperature sensor are identical.
The temperature sensors are sensors that have two
terminals. The temperature sensors do not require
supply vol
tage from the Electronic Control Module
(ECM). ECM connector J1/P1 terminal 34 is the
common connection for the engine temperature
sensors.
The sensor common connection is shared
between all of the temperature sensors. The common
line is connected to each sensor connector terminal
2. Termin
al 1 is the sensor output. The signal voltage
from terminal 1 of each sensor is supplied to the
appropriate terminal at ECM Connector J1/P1.