Range Rover (LP) V8-4.0L (1999)
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REDESIGNED TCU
On vehicles built up to VIN VA372390 there have been a number of reports of TCU failure because of over-current protection problems. A redesigned TC
System Diagnosis
The following Symptom/Complaint diagnostic procedures should allow for easy diagnosis of a Transfer Gearbox Control System problem. The procedure
CAUTION:
In order to avoid damaging a replacement TCU, check the shift control motor before energizing the system (Check # 4).
SYMPTOM/COMPLAINT:
No range change
^
Burning odor
^
H-gate lights on, flashes if shift requested "Select Neutral" warning (possible)
DESCRIPTION:
The output drive circuits in the TCU may have failed. The shift control motor may have failed.
REPAIR:
1.
Check TCU output to shift control motor (Check 2).
2.
Check Fuse No.4 in BeCM.
3.
Inspect Shift control motor (Check 4).
SYMPTOM/COMPLAINT:
^
No range change
^
Both sides of H-gate dim/out
^
Poor shifting of automatic transmission in high range (possible).
^
No response to range change requests.
DESCRIPTION:
TCU may be inoperative or lack ignition feed.
REPAIR:
1.
Check for blown fuse Position No.6.
2.
Check ignition feed to TCU.
3.
If 1 and 2 check out, replace TCU.
