Range Rover Automatic Transmission. Manual - part 4

1-13

Operation Pride

CODE: 07 FMV2, Shift solenoid B malfunction

EFFECT: Limp home in third or fourth

DESCRIPTION

A different gear may be encountered momentarily, i.e.:

First gear engages when fourth is selected.

Second gear engages when third is selected.

Third gear is engaged when first is selected.

Fourth gear engages when first is selected.

Reverse gear does not engage.

CAUSE

Open circuits or shorts in the wiring of the MV2 solenoid

REPAIR

Check the continuity of the wiring from the TCM to the transmission connector and also the resis-
tance of the MV2 solenoid.
See figure 1 for assistance with the transmission connector pinouts and resistance of the solenoid.

CODE: 09 FPRGANGZ1, Mode output 1

EFFECT: No noticeable effect

DESCRIPTION

Because the MES lines are an output to the BeCM they do not create a failure mode in the TCM.
The following symptoms may be evident if the MES lines fail open or are shorted.

Sport is recognized by the BeCM as a fault.

Economy is recognized by the BeCM as low range manual.

Manual is recognized by the BeCM as Economy.

CAUSE

Open circuits or shorts in the wiring of the MES lines from the TCM to BeCM.

REPAIR

Verify that the MES lines have good continuity and no shorts are evident.

1-13

Operation Pride

CODE: 10 FPRGANZ2, Mode output 2

EFFECT: No noticeable effect

DESCRIPTION

Because the MES lines are an output to the BeCM they do not create failure mode in the TCM.
The following symptoms may be evident if the MES lines fail open or are shorted.

Sport is recognized by the BeCM as a fault.

Economy is recognized by the BeCM as low range manual.

Manual is recognized by the BeCM as Economy.

CAUSE

Open circuits or shorts in the wiring of the MES lines from the TCM to BeCM.

REPAIR

Verify that the MES lines have good continuity and no shorts are evident.

CODE: 12 FDKT, Throttle angle electrical short

EFFECT: Substitute throttle angle of 30%

DESCRIPTION

Incorrect TPS information from the ECM can result in erratic shifts or no kickdown. This informa-
tion is transmitted to the TCM in the form of a Pulse Width Modulation (PWM) signal. This signal
should normally have a duty cycle of 5% to 94%.

CAUSE

This fault will be flagged if the duty cycle is outside of the 5% to 94% range for more than 50 ms
with the engine rpm greater than 580 rpm. Intermittent connections at either the ECM, TCM or in-
line connectors C551 and C659 can be the cause of this fault.

REPAIR

Verify that the TPS signal to the ECM is good; if not, then false signals will also be sent to the
TCM. Check the following conectors for any sign of loose connections or terminals backing out:

ECM connector C505 pin 27.

TCM connector C601 pin 47.

In-line connectors C551 pin 5 and C659 pin 7.

1-13

Operation Pride

CODE: 13 FMVWK, TCC output state does not match command state

EFFECT: Limp home in third or fourth

DESCRIPTION

TCC does not engage in third or fourth gears.

TCC does not disengage causing vibrations at lower engine speeds and stalling when coming to
a stop.

CAUSE

Open circuits or shorts in the wiring of the TCC solenoid.

REPAIR

Check the continuity of the wiring from the TCM to the transmission connector and also the
resistance of the TCC solenoid.
See figure 1 for assistance with the transmission connector pinouts and resistance of the solenoid.

CODE: 20 FPLUSMV, Solenoid supply malfunction

EFFECT: Limp home in third or fourth

DESCRIPTION

Problems encountered with gearboxes selecting limp home mode and having stored code 20 are
an indication that the control unit is receiving insufficient battery voltage to enable the solenoid
supply rail, pin 19.
To get this fault, the internal relay must have already energized, which means that the TCM sup-
ply voltage must be greater than 10.5V at ignition switch on. However, during cranking this volt-
age may drop and adversely affect the solenoid supply line. Communications problems may also
be evident with the TCM and Gear box. Fault messages with no codes stored can occur.

CAUSE

Insufficient voltage to pin 1 during cranking or normal operation.

REPAIR

Check BeCM supply studs for battery voltage, (located on the side of the BeCM next to the fuses).
Ensure that the voltage at these studs is the same as the voltage at the battery terminals. If not,
investigate chassis grounds for looseness, corrosion or wiring problems and ensure the BeCM
supply stud connections are electrically good.
Locate BeCM connector C625 pin 3 and do a voltage drop test from this pin to the battery supply
stud with the NLG wire attached to it (just to the left of the fuses). If more than 0.3 volts are dropped
across these connections, then there is an internal problem with the BeCM. Replace BeCM.

1-13

Operation Pride

CODE: 21 FN_MOT, Engine speed, no signal

EFFECT: Limp home in third or fourth

DESCRIPTION

Can be caused by the engine stalling out while in gear, or by CPS signals not being reliably re-
ceived by the ECM.

CAUSE

This fault is flagged if the engine exceeds 6100 rpm for more than 300 ms. In addition, if the engine
speed drops below 95 rpm and the selected gear is not Park or Neutral while the output speed sen-
sor signal is greater than 300 rpm, then the fault will be flagged if its duration is longer than 200 ms.

REPAIR

Verify that the CPS is not loose in its mounting on the block and its electrical connections are good.
Check that the engine speed signal is being received by the TCM from the ECM via the BeCM.
Failure of the BeCM can result in the loss of this signal.
Check BeCM connections C625 pin 11 and C112 pin 9 for signs of a signal.

CODE: 22 FDR, Pressure control regulator

EFFECT: Limp home in third or fourth

DESCRIPTION

Harsh shifts as maximum pressure is applied due to lack of pressure regulation.

CAUSE

Open circuits or shorts in the wiring of the TCC solenoid.

REPAIR

Check the continuity of the wiring from the TCM to the transmission connector and also the resis-
tance of the pressure regulator solenoid. See figure 1 for assistance with the transmission connector
pinouts and resistance of the solenoid.

CODE: 23 FME, Engine torque reduction

EFFECT: Poor shift quality - Maximum pressure on shifts

DESCRIPTION

This output from the TCM is a PWM signal that has an idle duty cycle of 17% (ignition retard inac-
tive) and a normal driving duty cycle of 20% to 90% (ignition retard of 0 to 27.8 degrees). Extreme
cold conditions and immediate start/drive away with transmission still cold can sometimes induce
Code 23.
Harsh shifts due to no ignition retard control.