Range Rover (LP) V8-4.0L (1999)
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2.
Check if the High side of the H-gate is lit (it should be brighter than the low side) when in high range.
3.
If it is lit properly, refer to Automatic Transmission Diagnostics.
4.
If it is not lit, check the connection at C603 pin 35.
5.
Check the motor encoder switches for appropriate motor position (Check 3). If the switches do not indicate high range, the TCU will not pull down
6.
If the encoder switches do not indicate high range, replace the shift control motor and check the vehicle for proper operation (Check 1).
7.
If the high range status line and connections are good, replace the TCU.
SYMPTOM/COMPLAINT:
^
Vehicle shifts poorly in Low Range.
DESCRIPTION:
The High Range Status line should be near battery voltage when the vehicle is in Low Range, informing the TCM that it is in low range. If the high range s
REPAIR:
1.
If the High side of the H-gate is dim, check the operation of the H-gate switch with TestBook (Check 5).
2.
If TestBook Test indicates a malfunction, check the circuit between H-gate connector C617 pin 8 and TCM C601 pin 46.
3.
If the H-gate is bright in both ranges, check for a short to ground in the High Range Status line.
SYMPTOM/COMPLAINT:
^
"Select Neutral" warning displayed in Message Centre.
DESCRIPTION:
Warning displayed if gear was selected before shift was completed.
REPAIR
1.
Inspect operation of TCU (Check 1).
2.
Pause in neutral to allow range change.
SYMPTOM/COMPLAINT:
^
Cruise control inoperative
DESCRIPTION:
The high range status line should be low (near 0V) while the vehicle is in high range. If it is high (near battery voltage) the BeCM thinks that the vehicle is
REPAIR:
1.
If the High side of the H-gate is lit, the problem is not TCU related, check elsewhere for the problem.
2.
Check the connection at C6~3 pin 35. Repair as necessary.
3.
Check the shift control motor position encoder switches (Check 3). If they do not indicate high range, the TCU will not pull the high range status lin
4.
If H-gate is not illuminated properly, check the motor position switch pins at the TCU. If no fault is found, replace the TCU.
SYMPTOM/COMPLAINT:
^
"Transfer Neutral" displayed in Message Centre
DESCRIPTION:
