P1828
P1828 LINE PRESSURE SWITCHDescription
Improper signal from line pressure switch is input due to open or short circuit. Also, a malfunction may have occurred in the line pressure switch or hydraulic circuit.
DTC Logic
P1828:
DTC CONFIRMATION PROCEDURE
1. DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Perform self-diagnosis.
Is DTC P1828 displayed?
YES >> Perform diagnosis procedure. Refer to "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis Procedure
1. CHECK LINE PRESSURE SWITCH SIGNAL
With CONSULT-III
1. Start engine.
2. Select DATA MONITOR mode for ALL MODE AWD/4WD with CONSULT-III.
3. Read out ON/OFF switching action of LINE PRES SW while operating 4WD shift switch.
Without CONSULT-III
1. Start engine.
2. Check voltage between transfer control unit harness connector terminals and ground.
Are inspection results normal?
YES >> GO TO 5.
NO >> GO TO 2.
2. CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND LINE PRESSURE SWITCH
1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Disconnect transfer control unit harness connector and the transfer terminal cord assembly harness connector.
3. Check continuity between transfer control unit harness connector E143 terminal 35 and transfer terminal cord assembly harness connector F56 terminal 1.
Continuity should exist.
Also check harness for short to ground and short to power.
Are inspection results normal?
YES >> GO TO 3.
NO >> Repair or replace damaged parts.
3. CHECK TRANSFER CONTROL UNIT
Check transfer control unit input/output signal. Refer to DLN-79, "Reference Value". Reference Value
Are inspection results normal?
YES >> GO TO 4.
NO >> Check the following. If any items are damaged, repair or replace damaged parts.
^ Transfer control unit pin terminals for damage or loose connection with harness connector.
^ Transfer control unit.
4. CHECK LINE PRESSURE SWITCH
1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Remove line pressure switch.
3. Push and release line pressure switch and check continuity between terminal 1 and ground.
Are inspection results normal?
YES >> GO TO 5.
NO >> Replace line pressure switch.
5. CHECK DTC
Perform the self-diagnosis, after driving a vehicle for a while.
Are inspection results normal?
YES >> GO TO 6.
NO >> Replace transfer control unit.
6. CRUISE TEST
Perform cruise test. Refer to DLN-6, "Preliminary Check". Preliminary Check
Are inspection results normal?
YES >> Inspection End.
NO >> Perform the applicable trouble diagnosis.
Component Inspection
1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Remove line pressure switch.
3. Push and release line pressure switch and check continuity between terminal 1 and ground.
4. If the inspection results are abnormal, replace the line pressure switch.