P1809

P1802 - P1804, P1809 TRANSFER CONTROL UNIT

Description
The transfer control unit controls the transfer control device which controls shifts between AUTO, 4H and 4LO and between 2WD and 4WD. A DTC may set when any of the following occur:
^ Malfunction is detected in the memory (RAM) system of transfer control unit.
^ Malfunction is detected in the memory (ROM) system of transfer control unit.
^ Malfunction is detected in the memory (EEPROM) system of transfer control unit.
^ AD converter system of transfer control unit is malfunctioning.

DTC Logic

DTC DETECTION LOGIC:

DTC CONFIRMATION PROCEDURE

1. DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Perform self-diagnosis.
Are DTC's P1802 - P1804 or P1809 detected?
YES >> Perform diagnosis procedure. Refer to "Diagnosis Procedure".
NO >> Inspection End.

Diagnosis Procedure

1. INSPECTION START
Do you have CONSULT-III?
YES or NO
YES >> GO TO 2.
NO >> GO TO 3.

2. PERFORM SELF-DIAGNOSIS (WITH CONSULT-III)

With CONSULT-III
1. Turn ignition switch ON. (Do not start engine.)
2. Select SELF-DIAG RESULTS mode for ALL MODE AWD/4WD with CONSULT-III.
3. Touch ERASE.
4. Turn ignition switch OFF and wait at least 10 seconds.
5. Perform the self-diagnosis again.
Is the CONTROL UNIT 1 [P1802], CONTROL UNIT 2 [P1803], CONTROL UNIT 3 [P1804] or CONTROL UNIT 4 [P1809] displayed?
YES >> Replace transfer control unit.
NO >> Inspection End.

3. PERFORM SELF-DIAGNOSIS (WITHOUT CONSULT-III)

Without CONSULT-III
1. Perform the self-diagnosis and then erase self-diagnostic results. Refer to DLN-17, "CONSULT-III Function (ALL MODE AWD/4WD)". Consult-III Function (All Mode AWD/4WD)
2. Perform the self-diagnosis again.
Do the self-diagnostic results indicate AD converter?
YES >> Replace transfer control unit.
NO >> Inspection End.