Range Rover Automatic Transmission. Manual - part 13

System Information Document

____________________________________________________________________________________________________
_
[ZF_4SPD\Project_Specs]

[Revision: 2.3]

____________________________________________________________________________________________________
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© Rover Group 1998

Page 23 of 52

Fault

Description

CARB

Ambient 1

Ambient 2

Ambient 3

Solenoid valve lockup clutch check (short circuit to +)

P0743

N_MOT

AN8

UBATT

The transmission ECU has diagnosed a short circuit to 12V of pin 32.

Diagnostic operates:

Continuously

Conditions to be met to run Diagnostic:

Torque converter unlocked

Time between fault present & fault stored:

10ms

Variables used by the diagnostic:

Voltage at Pin 32

Will limp home mode be selected:

Yes

Conditions to be met to clear the fault:

Initialisation complete, engine cranked, diagnostic runs & fault not present

Fault

Description

CARB

Ambient 1

Ambient 2

Ambient 3

Solenoid valve 1check (short circuit to +)

P0753

N_MOT

AN6

UBATT

The transmission ECU has diagnosed a short circuit to 12V of pin 30.

Diagnostic operates:

Continuously

Conditions to be met to run Diagnostic:

Solenoid valve 1 = off

Time between fault present & fault stored:

10ms

Variables used by the diagnostic:

Voltage at Pin30

Will limp home mode be selected:

Yes

Conditions to be met to clear the fault:

Initialisation complete, engine cranked, diagnostic runs & fault not present

Fault

Description

CARB

Ambient 1

Ambient 2

Ambient 3

Solenoid valve 2check (short circuit to +)

P0758

N_MOT

AN7

UBATT

The transmission ECU has diagnosed a short circuit to 12V of pin 33.

Diagnostic operates:

Continuously

Conditions to be met to run Diagnostic:

Solenoid valve 2 = off

Time between fault present & fault stored:

10ms

Variables used by the diagnostic:

Voltage at Pin 33

Will limp home mode be selected:

Yes

Conditions to be met to clear the fault:

Initialisation complete, engine cranked, diagnostic runs & fault not present

Fault

Description

CARB

Ambient 1

Ambient 2

Ambient 3

Pressure regulator check (short circuit to +)

P0748

N_MOT

VGT_$X

UBATT

The transmission ECU has diagnosed a short circuit to 12V of pin 5.

Diagnostic operates:

Continuously

Conditions to be met to run Diagnostic:

None

Time between fault present & fault stored:

150ms

Variables used by the diagnostic:

Voltage at Pin 5

Will limp home mode be selected:

Yes

Conditions to be met to clear the fault:

Initialisation complete, engine cranked, diagnostic runs & fault not present

Fault

Description

CARB

Ambient 1

Ambient 2

Ambient 3

CAN message MD_REIB invalid (FFh)

P1884

N_MOT

VGT_$X

MMM

The CAN message from the engine management controller which informs the transmission of the engine friction is invalid.

Diagnostic operates:

Continuously

Conditions to be met to run Diagnostic:

No CAN timeout or CAN level fault stored

Time between fault present & fault stored:

Filter time 2.5s

Variables used by the diagnostic:

CAN message MD_REIB from engine management controller

Will limp home mode be selected:

Conditions to be met to clear the fault:

Engine started with fault no present

System Information Document

____________________________________________________________________________________________________
_
[ZF_4SPD\Project_Specs]

[Revision: 2.3]

____________________________________________________________________________________________________
_
© Rover Group 1998

Page 24 of 52

Fault

Description

CARB

Ambient 1

Ambient 2

Ambient 3

MES line 1 fault

P1810

N_MOT

AN9

UBATT

One of the wires which drives the sport and manual lights in the instrument pack has an electrical fault.

Diagnostic operates:

Continuously

Conditions to be met to run Diagnostic:

None

Time between fault present & fault stored:

1 s

Variables used by the diagnostic:

Voltage at 51

Will limp home mode be selected:

Conditions to be met to clear the fault:

Ignition on with fault not present

Fault

Description

CARB

Ambient 1

Ambient 2

Ambient 3

MES line 2 fault

P1810

N_MOT

AN11

UBATT

One of the wires which drives the sport and manual lights in the instrument pack has an electrical fault.

Diagnostic operates:

Continuously

Conditions to be met to run Diagnostic:

None

Time between fault present & fault stored:

1 s

Variables used by the diagnostic:

Voltage at pin 25

Will limp home mode be selected:

Conditions to be met to clear the fault:

Ignition on with fault not present

Fault

Description

CARB

Ambient 1

Ambient 2

Ambient 3

Position switch monitoring (permanent)

P0705

N_MOT

YPO_OLd

UBATT

The position switch is the electrical input to the transmission controller of the driver selected PRiNDle position. The fault
means the ECU has recognised an electrical code from this switch which does not represent a valid position.

The fault can be due to 3 reasons. Firstly, one or more of the wires to the position switch has become open circuit or short
circuit to 0V or 12V. Secondly, the 12V supply from the body control unit to the position switch has been removed whilst the
ignition is in position II (in extreme circumstances, this may be possible whilst the vehicle is cranking). Thirdly, the position
switch is worn, or has water / dirt ingress. In the last case, the position switch must be changed. The following table indiates
the voltages which should be seen by the ECU in each selector position, whilst the ignition is on.

98MY Discovery selector codes. (A Z* code in this table represents an intermediate selector position.)

Position Switch

ECU Pin

Selector Position

Line 1 (W)

12V

Line 2 (X)

12V

Line 3 (Y)

12V

Line 4 (Z)

12V

99MY Range Rover selector codes.

Position Switch

ECU Pin

Selector Position

Line 1 (W)

Line 2 (X)

Line 3 (Y)

Diagnostic operates:

Continuously

Conditions to be met to run Diagnostic:

None

Time between fault present & fault stored:

100 ms

Variables used by the diagnostic:

W,X,Y, (Z) digital inputs

Will limp home mode be selected:

Yes

Conditions to be met to clear the fault:

Ignition to be switched on whilst fault not present, engine cranked.

System Information Document

____________________________________________________________________________________________________
_
[ZF_4SPD\Project_Specs]

[Revision: 2.3]

____________________________________________________________________________________________________
_
© Rover Group 1998

Page 25 of 52

Fault

Description

CARB

Ambient 1

Ambient 2

Ambient 3

CAN level monitoring

P1842

N_MOT

VGT_$X

MMM

The CAN protocol is not compatible between the engine and transmission controller.

Diagnostic operates:

On arrival of first CAN message from the Engine Management Controller

Conditions to be met to run Diagnostic:

Ignition on

Time between fault present & fault stored:

1.5 s

Variables used by the diagnostic:

CAN_STAND = 22H (CAN message)

Will limp home mode be selected:

Yes

Conditions to be met to clear the fault:

Ignition to be switched on whilst fault not present, engine cranked.

Fault

Description

CARB

Ambient 1

Ambient 2

Ambient 3

CAN bus monitoring

P1841

N_MOT

VGT_$X

MMM

Messages being transmitted on the CAN bus are being corruprted.

Diagnostic operates:

Continuously

Conditions to be met to run Diagnostic:

None

Time between fault present & fault stored:

300 ms

Variables used by the diagnostic:

None

Will limp home mode be selected:

Yes

Conditions to be met to clear the fault:

Ignition to be switched on whilst fault not present, engine cranked.

Fault

Description

CARB

Ambient 1

Ambient 2

Ambient 3

CAN timeout monitoring

P1843

N_MOT

VGT_$X

UBATT

There has been no communication from the engine management controller over the CAN serial link for a specified time.

Diagnostic operates:

Continuously

Conditions to be met to run Diagnostic:

None

Time between fault present & fault stored:

1 s

Variables used by the diagnostic:

Time since last CAN message received

Will limp home mode be selected:

Yes

Conditions to be met to clear the fault:

Ignition to be switched on whilst fault not present, engine cranked.

Fault

Description

CARB

Ambient 1

Ambient 2

Ambient 3

CAN message WFPDK (Throttle angle) is invalid (FFh)

P1884

N_MOT

VGT_$X

MMM

The CAN message WFPDK indicates to the transmission controller the driver demand (ie accelerator pedal position).

Diagnostic operates:

Continuously

Conditions to be met to run Diagnostic:

None

Time between fault present & fault stored:

10ms

Variables used by the diagnostic:

Throttle angle signal on CAN

Will limp home mode be selected:

No, substitute throttle angle, Gearbox lights to indicate Kick down not available

Conditions to be met to clear the fault:

Ignition to be switched on whilst fault not present, engine cranked.

Fault

Description

CARB

Ambient 1

Ambient 2

Ambient 3

CAN message T_MOT invalid (FFh)

P1884

N_MOT

VGT_$X

MMM

The CAN message T_MOT (engine temperature) from the engine management controller is invalid.

Diagnostic operates:

Continuously

Conditions to be met to run Diagnostic:

None

Time between fault present & fault stored:

10 ms

Variables used by the diagnostic:

Engine temperature signal via CAN

Will limp home mode be selected:

No, substitute engine temperature used.

Conditions to be met to clear the fault:

Ignition to be switched on whilst fault not present, engine cranked.

System Information Document

____________________________________________________________________________________________________
_
[ZF_4SPD\Project_Specs]

[Revision: 2.3]

____________________________________________________________________________________________________
_
© Rover Group 1998

Page 26 of 52

Fault

Description

CARB

Ambient 1

Ambient 2

Ambient 3

CAN message V3 (road speed) invalid (FFh)

P1884

N_MOT

VGT_$X

MMM

The CAN message V3 (Velocity) from the engine management controller is invalid.

Diagnostic operates:

Continuously

Conditions to be met to run Diagnostic:

None

Time between fault present & fault stored:

10ms

Variables used by the diagnostic:

CAN message V3

Will limp home mode be selected:

Conditions to be met to clear the fault:

Ignition to be switched on whilst fault not present, engine cranked.

Fault

Description

CARB

Ambient 1

Ambient 2

Ambient 3

Downshift safety monitoring

P0721

N_MOT

VGT_$X

MMM

The transmission control unit has prevented a gear shift which would have caused an engine overspeed.

Diagnostic operates:

Continuously

Conditions to be met to run Diagnostic:

Transmission not in Limp Home

Time between fault present & fault stored:

10ms max.

Variables used by the diagnostic:

Engine Speed, Target gear

Will limp home mode be selected:

Yes

Conditions to be met to clear the fault:

Ignition to be switched on whilst fault not present, engine cranked.

Fault

Description

CARB

Ambient 1

Ambient 2

Ambient 3

Stall speed monitoring

P0722

N_MOT

VGT_$X

MMM

The torque converter has appeared to slip more than the specificed amount.

Diagnostic operates:

Continuously

Conditions to be met to run Diagnostic:

None

Time between fault present & fault stored:

40 ms

Variables used by the diagnostic:

Engine Speed, gear selected, Output shaft speed.

Will limp home mode be selected:

Yes

Conditions to be met to clear the fault:

Ignition to be switched on whilst fault not present, engine cranked.

Fault

Description

CARB

Ambient 1

Ambient 2

Ambient 3

Position Switch during cranking (99MY Range Rover only)

P0705

N_MOT

YPO_Old

UBATT

The engine speed has exceeded its maximum speed.

Diagnostic operates:

During cranking only

Conditions to be met to run Diagnostic:

None

Time between fault present & fault stored:

10 ms

Variables used by the diagnostic:

Engine speed, selector position, road speed ?

Will limp home mode be selected:

Yes

Conditions to be met to clear the fault:

Ignition to be switched on whilst fault not present, engine cranked.

Fault

Description

CARB

Ambient 1

Ambient 2

Ambient 3

Battery supply check

P1562

N_MOT

MMM

UBATT

Whilst the engine is running, the battery supply has fallen to below 9V.

Diagnostic operates:

Continuously

Conditions to be met to run Diagnostic:

Engine speed > 996 rpm

Time between fault present & fault stored:

300 ms

Variables used by the diagnostic:

Engine speed, battery supply voltage

Will limp home mode be selected:

Yes

Conditions to be met to clear the fault:

Ignition to be switched on whilst fault not present, engine cranked.

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