PleasureCraft Engine Group 5.0L, Руководство по диагностике

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2 - 10 ECM and Sensors 5.0/5.7/6.0/8.1L
MEFI 4 - PCM
Diagnosis
Engine Control Module (ECM)
To read and clear diagnostic trouble codes, use a scan tool
or Diagnostic Trouble Code (DTC) tool.
Important: Use of a scan tool is recommended to clear
diagnostic trouble codes from the ECM memory. Diagnostic
trouble codes can also be cleared by using the DTC tool.
Since the ECM can have a failure which may affect more
than one circuit, following the diagnostic procedures will
determine which circuit has a problem and where it is.
If a diagnostic procedure indicates that the ECM connections
or ECM is the cause of a problem and the ECM is replaced,
but does not correct the problem, one of the following
may be the reason:
•
Check for good ECM power and grounds.
•
There is a problem with the ECM terminal connections.
The diagnostic table will say ECM connections or
ECM. The terminals may have to be removed from the
connector in order to check them properly.
•
EEPROM program is not correct for the application.
Incorrect components may cause a malfunction and
may or may not set a DTC.
•
The problem is intermittent. This means that the
problem is not present at the time the system is being
checked. In this case, refer to the
Symptoms portion
of the manual and make a careful physical inspection
of all portions of the system involved.
•
Shorted relay coil or harness. Relays are turned
“ON” and “OFF” by the ECM using internal electronic
switches called drivers. A shorted relay coil or harness
may not damage the ECM but will cause the relay
to be inoperative.
Figure 2-13 - Engine Control Module (ECM)
On-Board Service
Engine Control Module (ECM) Replacement
Notice: When replacing the ECM, the ignition must be
“OFF” and disconnect the battery before disconnecting or
reconnecting the ECM “J1” and “J2” connectors to prevent
internal damage to the ECM.
Notice: To prevent possible electrostatic discharge damage
to the ECM, do not touch the connector pins. The ECM is
an electrical component. Do Not soak in any liquid cleaner
or solvent, as damage may result.
Remove or Disconnect
1. Negative battery cable.
2. “J1” and “J2” connectors from ECM.
3. The ECM mounting screws.
4. ECM from mounting bracket.
Important
•
Make sure the new ECM has the same part number
and service number as the old ECM, to insure proper
engine performance.
Install or Connect
1. New ECM to mounting bracket.
2. The ECM mounting screws. Torque to 10-14 N•m
(88-124 lb in).
3. “J1” and “J2” connectors to ECM.
4. Negative battery cable.
J2 J1
MEFI3004