Range Rover Automatic Transmission. Manual — part 7

1-13

Operation Pride

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 1, 7 and 9 under the center console for any similar connector problems.

GEMS P1777 code

EFFECT: “CHECK ENGINE” light on

DESCRIPTION

The ignition retard line from the ECM to the TCM will have a PWM signal to identify any ignition
retard requests during normal operation of the TCM.
This line will also indicate a fault condition when the TCM sends a PWM of less than 10% or
greater than 93%.

CAUSE

This can also be caused by a variety of electrical connector/terminal problems between the ECM
and TCM.

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 1, 7 and 9 under the center console for any similar connector problems.

System Information Document

____________________________________________________________________________________________________

[Revision: 2.3]

____________________________________________________________________________________________________
_
© 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

System

APPLICABILITY:

99MY Discovery Series II - 4.0 Petrol and 2.5 Turbo Diesel
99MY Range Rover - 4.0l and 4.6l Petrol Vehicles
99MY Range Rover Diesel transmissions are not covered by this document

DATE:

19

th

May 1998

System Information Document

____________________________________________________________________________________________________
_
[ZF_4SPD\Project_Specs]

[Revision: 2.3]

____________________________________________________________________________________________________
_
© Rover Group 1998

Page 2 of 52

INDEX

1

INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

1.1

G

ENERAL

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... 3

2

VEHICLE INTERFACE REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . 4

2.1

B

LOCK

D

IAGRAM

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4

2.2

I

NTERFACE SPECIFICATION

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.2.1

Gear Shift Solenoids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.2.2

Controller power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6

2.2.3

Serial information - inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... 7

2.2.4

Serial information – outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.2.5

Digital inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... 7

2.2.6

Digital outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... 13

2.2.7

Analogue inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2.2.8

Diagnostic interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... 15

2.3

ECU C

ONNECTOR

P

IN

-

OUT

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2.4

V

EHICLE CONNECTOR PIN OUTS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... 17

2.4.1

Diagnostic Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

2.4.2

Harness to Position switch (mounted on Transmission). . . . . . . . . . . . . . . . . . . . . . . . . . . 17

2.4.3

Harness to Solenoid Valves (mounted on Transmission). . . . . . . . . . . . . . . . . . . . . . . . . . 17

3

DESCRIPTION OF FUNCTIONALITY. . . . . . . . . . . . . . . . . . . . . . ..18

3.1

S

PECIAL FEATURES

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 18

3.1.1

Sport Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... 18

3.1.2

Manual Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

3.1.3

Towing / Driving up steep gradients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 18

3.1.4

Compensation for reduced engine torque . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 18

3.1.5

Calibration Selection (99MY V8 Range Rover Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

4

FAULT FINDING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...19

4.1

F

IXING FAULTS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

4.1.1

The transmission ECU is disconnected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 19

4.1.2

The transmission has diagnosed a fault. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

4.1.3

Power to the ECU has been lost or K line not connected. . . . . . . . . . . . . . . . . . . . . . . . . ... 19

4.2

MIL

LIGHT ILLUMINATION

(N.A.S.

VEHICLES ONLY

) . . . . . . . . . . . . . . . . . . . . . . . . ... 20

5

FAULT CODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..21

5.1

A

MBIENT CONDITIONS STORED

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

5.2

F

AULT CODES DESCRIPTIONS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... 21

5.3

I

MPACT ON THE SYSTEM OF EACH FAULT

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

6

GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

6.1

D

IMENSIONS AND FIXING DETAILS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... 31

6.2

V

OLTAGE REQUIREMENTS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... 31

7

FAULT TREE ANALYSIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32