Volvo 50-42LE transmission. Manual - part 3

AUTOMATIC TRANSMISSION SERVICE GROUP

Technical Service Information

VOLVO "850" 50-40LE

DIAGNOSTIC TROUBLE CODE RETRIEVAL

1992-1995 MODELS ONLY

TROUBLE CODE RETRIEVAL
   Faults are recorded in the Transmission Control Module (TCM) memory, in the form of Diagnostic Trouble
Codes (DTC).   Codes can be displayed manually using the LED Indicator on the Volvo diagnostic unit.   The
diagnostic unit is located at the right front of the engine compartment, as shown in Figure 9. The diagnostic unit
is equipped with an LED Indicator, Function Selector Cable and Activation Button, as shown in Figure 10.
Diagnostic unit output socket number 1 is used to retrieve TCM diagnostic codes, as shown in Figure 10.  Use
the following procedure to retrieve (DTC's).

(1)

(2)

(3)

(4)

(5)

(6)

(7)

Turn the ignition switch to the "OFF" position.

Remove the Function Selector Cable from it's storage cavity, and install it into diagnostic unit output
socket number 1, as shown in Figure 10.

Turn the ignition switch to the "ON" position.

Depress the Activation Button and keep depressed for more than one second, but not more than three
seconds. Refer to Figure 10.

Observe the LED Indicator on the diagnostic unit, and count the number of flashes to determine the
first Diagnostic Trouble Code stored in the TCM memory. All codes contain three digits (Example: 2-
1-3). Since all codes have three digits, each code requires three series of flashes on the LED Indicator.
Example is shown in Figure 10.

Since only one DTC can be retrieved with one push of the button, depress the Activation Button again
to determine if any additional DTC's have been stored in the TCM memory.

Read and record all Diagnostic Trouble Codes, pushing the activation button as many times as
necessary, until the first code returns to the display.
Note: The Transmission Control Module is capable of storing a maximum of five DTC's, so these
faults must be corrected and their DTC's cleared before any additional DTC's can be displayed. Refer
to Figure 11 for a Diagnostic Trouble Code description and interpretation.

CLEARING TROUBLE CODES
All Diagnostic Trouble Codes must be displayed at least once before it is possible to clear the codes from the
TCM memory. Only after the first DTC has returned to the display, will it be possible to clear the codes. Use the
following procedure:

(1)

(2)

(4)

Ensure that the Function Selector Cable is still located in diagnostic unit output socket number 1, as
shown in Figure 10, and the ignition switch is in the "ON" position.

Depress the activation button, and hold down for at least ten seconds, and watch for LED indicator
response. The LED indicator should go out three seconds after the button is released.

Depress the activation button, and hold down for at least an additional ten seconds, and watch for LED
indicator response. The LED indicator should go out when the button is released.

Ensure that the Diagnostic Trouble Codes have been cleared by pressing once on the activation button
again for more than one second, but less than three seconds, and observe LED indicator. If the code 1-
1-1 is displayed on the LED indicator, the DTC's have been cleared.

AUTOMATIC TRANSMISSION SERVICE GROUP

Technical Service Information

Figure 10

RETRIEVING TROUBLE CODES

}

3 SECONDS

EXAMPLE OF TROUBLE CODE 2-1-3

FUNCTION SELECTOR

CABLE

LED

INDICATOR

Once the Function Selector Cable has been inserted
in correct socket, depress button once and keep
depressed for more than one second, but not more
than three seconds. Diagnostic Trouble Codes are
read by observing and counting LED flashes to
determine the Diagnostic Trouble Code.

DIAGNOSTIC UNIT LOCATION

Figure 9

AUTOMATIC TRANSMISSION SERVICE GROUP

Technical Service Information

Figure 11

DTC

DESCRIPTION

WARNING

LAMP **

1-1-1

1-1-2

1-1-3

1-1-4

1-2-1

1-2-2

1-2-3

1-2-4

1-3-1

1-3-2

1-3-4

1-4-1

1-4-2

1-4-3
2-1-1

2-1-2

2-1-3

2-2-1

2-2-2

2-2-3

2-3-1

2-3-2

2-3-3

2-3-5
2-4-5

3-1-1

3-1-2

3-1-3

3-2-2

3-2-3

3-3-1

3-3-2
3-3-3

YES

NO
NO

YES *

NO FAULTS RECORDED

SHORT CIRCUIT TO BATTERY VOLTAGE IN SHIFT SOLENOID S1 CIRCUIT

SHORT CIRCUIT TO BATTERY VOLTAGE IN SHIFT SOLENOID S2 CIRCUIT

SHORT CIRCUIT TO BATTERY VOLTAGE IN LOCK-UP SOLENOID CIRCUIT

THROTTLE POSITION SENSOR SIGNAL TOO HIGH

THROTTLE POSITION SENSOR SIGNAL TOO LOW

IRREGULAR THROTTLE POSITION SENSOR SIGNAL

SPEEDOMETER SIGNAL ABSENT

RPM SIGNAL ABSENT

RPM SIGNAL FAULTY

INCORRECT SIGNAL FROM GEAR POSITION SENSOR

INCORRECT GEAR RATIO

LOCK-UP SLIPS OR IS NOT ENGAGED

INCORRECT SPEEDOMETER SIGNAL

HIGH TRANSMISSION OIL TEMPERATURE
BREAK OR SHORT IN TORQUE LIMITING CIRCUIT

FAULT IN TRANSMISSION CONTROL MODULE

INCORRECT LOAD SIGNAL

SHORT CIRCUIT IN TRANSMISSION TEMPERATURE SENSOR CIRCUIT

BREAK (OPEN) IN TRANSMISSION TEMPERATURE SENSOR CIRCUIT

SHORT CIRCUIT TO GROUND IN KICKDOWN SWITCH CIRCUIT

BREAK IN MODE SELECTOR CIRCUIT

SHORT CIRCUIT TO GROUND IN SHIFT SOLENOID S1 CIRCUIT

SHORT CIRCUIT TO GROUND IN SHIFT SOLENOID S2 CIRCUIT

SHORT CIRCUIT TO GROUND IN LOCK-UP SOLENOID CIRCUIT

BREAK (OPEN) IN SHIFT SOLENOID S1 CIRCUIT

BREAK (OPEN) IN SHIFT SOLENOID S2 CIRCUIT

BREAK (OPEN) IN LOCK-UP SOLENOID CIRCUIT

SHORT CIRCUIT TO BATTERY VOLTAGE IN EPC SOLENOID CIRCUIT

SHORT CIRCUIT TO GROUND IN MODE SELECTOR CIRCUIT

BREAK OR SHORT CIRCUIT TO GROUND IN EPC SOLENOID CIRCUIT

When a fault occurs the code is stored and the "WARNING" lamp in the instrument panel comes on. If the fault is
intermittent and ceases, the warning lamp will go out, but the DTC will remain.
Only for as long as the temperature remains high.

AUTOMATIC TRANSMISSION SERVICE GROUP

Technical Service Information

Figure 12

VOLVO

DTC

CODE DESCRIPTION

1-2-1

1-2-2

1-2-3

2-2-1

2-3-2
3-1-1

3-1-3
3-2-1

SPEEDOMETER SIGNAL ABSENT
RPM SIGNAL ABSENT

INCORRECT SIGNAL FROM GEAR POSITION SENSOR
INCORRECT 1st GEAR RATIO

SHORT CIRCUIT TO GROUND IN SHIFT SOLENOID S1 CIRCUIT

SHORT CIRCUIT TO GROUND IN SHIFT SOLENOID S2 CIRCUIT

BREAK (OPEN) IN SHIFT SOLENOID S1 CIRCUIT

SHORT CIRCUIT TO BATTERY VOLTAGE IN EPC SOLENOID CIRCUIT

OBD-ll

DTC

1-3-2

FAULT IN TRANSMISSION CONTROL MODULE (STH SHORT CIRCUIT)

P0750
P0750

P0745
P0745

P0755
P0755

2-2-2

BREAK (OPEN) IN SHIFT SOLENOID S2 CIRCUIT

2-1-3

THROTTLE POSITION SENSOR SIGNAL TOO HIGH

P0120

2-2-3

THROTTLE POSITION SENSOR SIGNAL TOO LOW

P0120
P0500
P0715

P0731

3-2-2

INCORRECT 2nd GEAR RATIO

P0732

3-2-3

INCORRECT 3rd GEAR RATIO

P0733

3-2-4

INCORRECT 4th GEAR RATIO

P0734

P0705

OBD-ll

CONNECTOR

OBD-ll

Connector Location:

In front of shifter

or in front of console

by gas pedal

VOLVO 96 & UP OBD-ll CODE DEFINITIONS

NOTE: Codes may be retrieved in OBD-ll Generic mode

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