Diagnosis Procedure: P2556-7B
- CHECK POWER SUPPLY VOLTAGE OF BCM
Check power supply and ground circuit of BCM. Refer to Diagnosis Procedure .
Is the inspection result normal?
YES
GO TO 2.
NO
Repair or replace the malfunctioning parts
- CHECK ENGINE COOLANT LEVEL
- Turn the ignition switch OFF.
- Check the engine coolant level. Refer to Inspection .
Is the inspection result normal?
YES
GO TO 4.
NO
Refill the engine coolant, and GO TO 3.
- Refer to Refilling .
- PERFORM DTC CONFIRMATION PROCEDURE AGAIN
Perform DTC confirmation procedure again. Refer to DTC Description
Is DTC P2556 detected again?
YES
GO TO 4.
NO
INSPECTION END
- CHECK COOLANT LEVEL SWITCH
- Turn the ignition switch OFF.
- Disconnect the coolant level switch harness connector.
- Insert jumper on the coolant level switch harness connector.
Coolant level switch
Specified value
Terminal
1
4
OK
- Remove jumper on the coolant level switch harness connector.
Coolant level switch
Specified value
Terminal
1
4
Not OK
Is the inspection result normal?
YES
GO TO 5.
NO
Replace reservoir tank. Refer to Removal and Installation .
- CHECK COOLANT LEVEL SWITCH CIRCUIT
- Turn the ignition switch OFF.
- Disconnect the BCM harness connector.
- Check the continuity between coolant level switch harness connector and BCM harness connector.
Coolant level switch
BCM
Continuity
Connector
Terminal
Connector
Terminal
E25
1
E16
159
Existed
4
158
Existed
- Check the continuity between coolant level switch harness connector and ground.
Coolant level switch
--
Continuity
Connector
Terminal
E25
4
Ground
Not existed
Is the inspection result normal?
YES
GO TO 6.
NO
Repair harness or connector.
- CHECK COOLANT LEVEL SWITCH
- Drain engine coolant from reservoir tank.
- Check the continuity between coolant level switch connector.
Coolant level switch
Continuity
Terminal
1
4
Not existed
Is the inspection result normal?
YES
INSPECTION END
NO
Replace reservoir tank. Refer to Removal and Installation .