Land Rover Range Rover Automatic Transmission System Rover Manual

Page 20 of 24
1-13 Operation Pride
Automatic Transmission Diagnostics - Electrical Symptoms
Model: 1995-97 Range Rover
REPAIR
Check the gear position on the PRNDL, message center and from the gearbox diagnostic in the
real time monitor section on TestBook.
Verify they all return the same information as the lever is moved through all possible combinations.
Check mechanical selector for correct positioning.
CODE: 40 FGANG1, First gear ratio incorrect (97 MY onwards)
EFFECT: Limp home in third or fourth...

Page 21 of 24
1-13 Operation Pride
Automatic Transmission Diagnostics - Electrical Symptoms
Model: 1995-97 Range Rover
CODE: 42 FGANG3, Third gear ratio incorrect (97 MY Onwards)
EFFECT: Limp home in third or fourth
DESCRIPTION
During normal operation, the TCM will monitor the input speed and output speed to determine if
the transmission is operating in the gear selected. The TCM will compare the ratio between the
calculated input speed and the output speed with the value for third gear stored in ROM. If...

Page 22 of 24
Automatic Transmission Diagnostics - Electrical Symptoms
TRANSFER BOX CONTROL UNIT (TCU) INDIC ATES LOW RANGE 
TRANSFER BOX CONTROL UNIT (TCU) INDIC ATES HIGH RANGE  

Page 23 of 24
1-13 Operation Pride
Automatic Transmission Diagnostics - Electrical Symptoms
Model: 1995-97 Range Rover
REPAIR
If the shift into low range does not take place, check TCU connector C603 pin 35 and TCM con-
nector C601 pin 46 for 0V in high range and greater than 10V when in low range. Check the TCU
for signs of overheating or a burning smell. If evident, replace the TCU. Make sure the motor is in
good condition before powering up with the new TCU as a failed motor will damage the new TCU....

Page 24 of 24
1-13 Operation Pride
Automatic Transmission Diagnostics - Electrical Symptoms
Model: 1995-97 Range Rover
REPAIR
Check the following connectors for any signs of loose connectors, lack of terminal tension, water
ingress, terminals backed out or dirt/corrosion on the terminals:

In-line connector C551 (near coil pack) pins 4, 5 and 6

ECM connectors C505 pins 27 and 29 and C507 pin 31
If nothing was found during this inspection and the fault is still present, check in-line connector
C659 pins...

System Information Document
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© Rover Group 1998 Page 1 of 52
ZF  - 4HP22EH -4.0l V8 vehicles
4HP24 -4.6l V8 vehicles
BOSCH  - GS8.87.0 -99MY Discovery Series II
GS8.87.1 -99MY Range Rover
4 Speed Electronic
Automatic Transmission System
APPLICABILITY: 99MY Discovery Series II - 4.0...

System Information Document
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[ZF_4SPD\Project_Specs][Revision:   2.3]
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© Rover Group 1998Page 2 of 52 INDEX
1INTRODUCTION.................................................................................................................................3...

System Information Document
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[ZF_4SPD\Project_Specs][Revision:   2.3]
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© Rover Group 1998Page 3 of 52 1 Introduction
1.1 General
This document is intended to be a guide to the BOSCH Transmission controllers for the ZF 4 Speed Automatic Transmission
unit incorporating the Torque Converter (4HP22).  The...

System Information Document
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[ZF_4SPD\Project_Specs][Revision:   2.3]
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© Rover Group 1998Page 4 of 52 2 Vehicle Interface requirements
2.1 Block Diagram
The Diagram below shows a summary of the vehicle architecture with reference to the Automatic Transmission Controller.
For more detail, please refer to...