Ford Falcon. Manual — part 234

307-01-39 Automatic

Transmission 307-01-39

DIAGNOSIS AND TESTING (Continued)

Fault Condition

Default Operation

Vehicle Speed Sensor Fault

The PRNDL display will flash, Performance and Sequential

Sports Shift modes will be inhibited and the torque converter will

be unlocked at all times.

If the transmission is in 4th gear at high engine speed it will stay

in 4th gear, otherwise it will shift to 3rd Limp Home gear state.

The vehicle will be speed limited to approximately 140 km/hr.

The reverse lockout feature will only operate above engine

speeds of 3000 ERPM.

In the event of a loss of speed signal the engine speed is used to

estimate vehicle speed.

NOTE: Speedo transducer faults are likely to cause the vehicle’s

speedometer to become inoperative.

Gear Lever Fault (Inhibitor/PRNDL

The gear lever is assumed to be in the Drive position, Sequential

switch)

Sports Shift and performance modes will be inhibited.

The torque converter will be unlocked at all times.

Transmission Oil Temperature

All shifts will be firm until the transmission has warmed up, as a

Sensing FaultTransmission Oil

high transmission oil temperature is assumed. If a fault is

Temperature Sensing Fault

undetected, the temperature is likely to be evaluated as being

lower than actual resulting in softer shifts with "end bump" (very

firm feel at the end of the shift).

Sequential Sports

All shifts will occur as if the mode is set to Adaptive in the

Shift/Performance Mode Setting

instance of the Performance mode switch a being faulty.v

Fault

All shifts will occur as if the mode is set to Performance in the

instance of the Sequential Sports Shift mode switches being

faulty.

The mode indicator will not respond to changes in the mode

switch setting. If a fault is undetected, the mode as indicated by

the mode indicator is likely to not respond to the mode switch.

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307-01-40 Automatic

Transmission 307-01-40

DIAGNOSIS AND TESTING (Continued)

Fault Condition

Default Operation

Battery Voltage Sensing Fault

If the battery voltage is too low then:If the battery voltage is too

low then:

Shifts into 1st gear prohibited.
Transmission uses High Line.

If the battery voltage is too high or faulty then:If the battery

voltage is too high or faulty then:

Standby S5 current is set to 0 mA for all gears except Auto

1st.v

ON/OFF Solenoid Electrical Fault

If a fault is detected in the electrical circuit of solenoid 1, 3, 4, 5

(Solenoid 1, 3, 4, 5 & 6)

or 6 the Fault Detection Strategy puts the transmission into a

Limp Home Mode where: If a fault is detected in the electrical

circuit of solenoid 1, 3, 4, 5 or 6 the Fault Detection Strategy puts

the transmission into a Limp Home Mode where:

The PRNDL display will flash.
The transmission will shift to 3rd Limp Home gear state
The torque converter will be unlocked at all times.
Performance and Sequential Sports Shift modes will be

inhibited.
No shift ramps will be available.
Above approximately 90 km/hr the solenoid 6 is switched ON

supplying Low Line Pressure to the transmission to soften

high speed gear shift engagement.
In the case of a single solenoid fault the vehicle will be speed

limited to approximately 120 km/hr, if multiple faults are

present then the vehicle is limited to approximately 45 km/hr.
Engine torque is limited to protect the transmission from stall

starts in 4th.
The reverse lockout feature will not operate in the event of a

solenoid 1 or 3 fault.

ON/OFF Solenoid Electrical Fault

If a fault is detected in the electrical circuit of solenoid 2 the Fault

(Solenoid 2)

Detection Strategy puts the transmission into a Limp Home Mode

where:

The PRNDL display will flash.
The transmission will shift to 3rd Limp Home gear state if

below 90 km/hr or S3 fault is present, otherwise a shift to 4th

gear will be attempted.
The torque converter will be unlocked at all times.
Performance and Sequential Sports Shift modes will be

inhibited.
No shift ramps will be available.
Above approximately 90 km/hr the solenoid 6 is switched ON

supplying Low Line Pressure to the transmission to soften

high speed gear shift engagement.
In the case of a single solenoid fault the vehicle will be speed

limited to approximately 120 km/hr, if multiple faults are

present then the vehicle is limited to approximately 45 km/hr.
Engine torque is limited to protect the transmission from stall

starts in 4th.
The reverse lockout feature will be available.

ON/OFF Solenoid Electrical Fault

If Solenoid 7 is found faulty it is disabled resulting in transmission

(Solenoid 7)

always unlocked. The transmission does not go into LOS.

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307-01-41 Automatic

Transmission 307-01-41

DIAGNOSIS AND TESTING (Continued)

Fault Condition

Default Operation

ON/OFF Solenoid Hydraulic Fault

When Reverse is selected solenoid 1 is switched OFF while

(Solenoid 1 & 3)

solenoid 3 is switched ON, once a speed signal has been

recognised the solenoid switching state is inverted next time

Reverse is selected. A hydraulic solenoid 1or 3 fault is detected

when Reverse is selected and the engine exceeds the stall speed

while the vehicle is stationary, that is the transmission is

neutralised. The Fault Detection Strategy puts the transmission

into Limp Home Mode as if it had a solenoid 1 or 3 electric circuit

fault as in 9A.

ON/OFF Solenoid Hydraulic Fault

Whenever the transmission is in 3rd or 4th gear and is not in the

(Solenoid 2)

process of a gear shift the engine speed is monitored to confirm

that it is in a valid vehicle speed range for 3rd and 4th gear

states. In the event that it is not, the Fault Detection Strategy puts

the transmission into Limp Home Mode as if it had a solenoid 2

electric circuit fault as in 9B.

Software Fault

The transmission adopts its Limited Operation Strategy of

operation. i.e. 3rd gear, unlocked and high line pressure.

The operation of the PCM under this condition is difficult to

predict. Its operation may be erratic. If a fault is undetected, the

operation of the PCM is likely to be erratic.

Power Supply Fault

The transmission adopts its Limited Operation Strategy of

operation. i.e. 3rd gear, unlocked and high line pressure.

If there is an intermittent power supply connection, the PCM will

power-up in fourth gear and then shift to the appropriate gear to

satisfy the conditions present. The power supply is not monitored

for fault evaluation.

If a fault is undetected, the operation of the

transmission is dependent of which solenoid is

actually faulty. The following is a list of characteristics

for different solenoid fault conditions.

Solenoid Fault Transmission Response (when fault undetected)

Solenoid

Condition

Transmission Operation

1

Always OFF

Auto 1st gear instead of Garage

1st 3rd gear instead of 4th.

Manual 1st unavailable.

Reverse Lockout feature not

available.

This results in delayed N-D

engagement.

Always ON

Garage 1st gear instead of Auto

1st.

4th gear instead of 3rd.

Loss of engine braking in 2nd

gear.

Loss of Reverse every second

reverse engagement.

This results in a 1 -> 2->4->4 shifts

as the vehicle accelerates from

rest.

2

Always OFF

3rd gear instead of Garage 1st,

Auto 1st and 2nd.

Manual 1st unavailable.

This results in 3 -> 3 -> 3 -> 4

shifts as the vehicle accelerates

from rest.

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307-01-42 Automatic

Transmission 307-01-42

DIAGNOSIS AND TESTING (Continued)

Solenoid

Condition

Transmission Operation

Always ON

2nd gear instead of 3rd.

Garage 1st gear instead of 4th.

This results in a 1 -> 2 -> 2 -> I

(overrun) downshift as the vehicle

accelerates from rest.

3

Always OFF

Manual 1st gear unavailable.

Reverse Lockout feature not

available.

The following shifts become poor:1

-> 3, 1 -> 4, 2 -> 1, 2 -> 3, 4 -> 2, 4

-> 1.

Always ON

Manual 1st gear instead of Garage

1st.

Loss of Reverse every second

reverse engagement.The following

shifts become poor:3 -> 4, 4 -> 3, 3

-> 2.

There may be slippage in the

gears during torque converter

locking.

4

Always OFF

2nd gear instead of Garage 1st

and Auto 1st.

This results in a 2 -> 2->3->4 shifts

as the vehicle accelerates from

rest.

The following shifts become poor:2

-> 3, 3 -> 2, 3 -> 4, 4 -> 3.

Always ON

2nd gear instead of Garage 1st

and Auto 1st.

This results in a 2 -> 2->3->4 shifts

as the vehicle accelerates from

rest.

The following shifts become poor:2

-> 3, 3 -> 2, 3 -> 4, 4 -> 3.

5

Output Pressure High

Garage 1st gear and Auto 1st not

available.

All shifts become poor.

Output Pressure Low

Torque converter slips during

lockup.

All shifts become poor.

6

Always OFF

Line pressure always high.

Torque Converter Blow off valve

noise may be audible at low

speeds and throttle.

Always ON

Line pressure always low thus

resulting in risk of slippage in

gears.

7

Always OFF

Torque converter always unlocked.

Always ON

Torque converter always locked,

engine stall at low speed.

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