Saturn Transmission. Manual - part 3

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41
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51
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53

NUMBER

DESCRIPTION

CODE/FLAG

No 2nd Gear
No 3rd Gear
No 4th Gear
No TCC
TCC Stuck On
Transaxle Temp. Circuit Open (Cold)
Transaxle Temp. Circuit Grounded (Hot)
ECM Communications Failed 
(1991 Perf. [LLO], 1992-1994 Vehicles)
No Turbine Speed Signal
Turbine Speed Sensor Signal Noise
No Vehicle Speed Signal
Vehicle Speed Sensor Signal Noise
Actuators Lost Power (1994)
Master Enable Relay Open/Grounded (1993 Vehicles)
Master Enable Relay Open/Grounded (1991-1992 Vehicles)
Master Enable Relay Shorted to Voltage (1993 Vehicles)
Master Enable Relay Shorted to Voltage (1991-1992 Vehicles)
Selector Switch - No Data
Selector Switch - Undefined Data
PCM Communication Interrupt Failure
Hold Mode Voltage Low (1991-1992 Vehicles)
Selector Switch - Invalid Data 
(1991 Perf. [LLO], 1992-1994 Vehicles
PCM Serial Link Data Invalid
Hold Mode Stuck On (1991-1992 Vehicles)
Hold Mode Stuck Off (1991-1992 Vehicles)

Code
Code
Code
Code
Code
Code
Code
Code

Code
Code
Code
Code
Code
Code

Flag

Code

Flag

Code
Code

Flag

Code
Code

Flag

Code
Code

* Diagnostic Procedure is the same for both Codes and Flags

Figure 19

1991-95 TROUBLE CODES/INFORMATION FLAGS

Continued

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56
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61
62
63

A/D Error - Analog Voltage Signals Converted to Digital 
Signals inside the PCM
Transaxle Temperature Resistor Failure
Generic Field Effect Transistor (FET) Driver Failure (93-94)*
Generic FET Driver Failure (1991 and 1992 Vehicles)*
Non-Volatile Random Access Memory (RAM) Failure
PCM Programmable Read-Only Memory (PROM) Failure
PCM Interrupt Failure
PCM Random Access Memory (RAM) Failure

Code

Code 
Code 

Flag
Flag
Flag
Flag
Flag

15

AUTOMATIC TRANSMISSION SERVICE GROUP

Technical Service Information

Note: Refer to page 105 for 1996 and Up Trouble Codes

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81
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NUMBER

DESCRIPTION

CODE/FLAG

PCM Electrically Erasable/Programmable Read-Only 
Memory (EEPROM) Failure
Battery Voltage Out of Range High or Low
Clamp Circuit Shorted (1991-1992 Vehicles)
Clamp Circuit Open (1991-1992 Vehicles)
Line Pressure Actuator Circuit Grounded/Open
Line Pressure Actuator Circuit Shorted to Voltage
2nd Gear Actuator Circuit Grounded/Open
2nd Gear Actuator Circuit Shorted to Voltage
3rd Gear Actuator Circuit Grounded/Open
3rd Gear Actuator Circuit Shorted to Voltage
3rd Gear Stuck On (1993-1994 Vehicles)*
3rd Gear Stuck On (1991-1992 Vehicles)*
4th Gear Actuator Circuit Grounded/Open
4th Gear Actuator Circuit Shorted to Voltage
4th Gear Stuck On (1993-1994 Vehicles)*
4th Gear Stuck On (1991-1992 Vehicles)*
TCC Actuator Circuit Grounded/Open
TCC Actuator Circuit Shorted to Voltage
Temperature Signal Unstable (1991 Base [LKO] Vehicles)
Temperature Signal Low
Brake Switch Stuck Open
Brake Switch Stuck Closed
Engine Speed Signal Invalid
TCC Hold Circuit Grounded/Open (1991-1992 Vehicles)
TCC Hold Circuit Shorted to Voltage (1991-1992 Vehicles)
Master Enable Relay Stuck On (1991-1993 Vehicles)

Flag

Flag
Flag
Flag
Flag
Flag
Flag
Flag
Flag
Flag

Code

Flag
Flag
Flag

Code

Flag
Flag
Flag
Flag
Flag
Flag
Flag
Flag
Flag
Flag
Flag

* Diagnostic Procedure is the same for both Codes and Flags

TROUBLE CODES/INFORMATION FLAGS

Continued

Figure 20

Master Enable Relay Stuck On (1991-1993 Vehicles)
DLC Serial Communication Link Interrupt (1991 Base [LKO] 
Vehicles)
Clamp Circuit Intermittent Fault (1991-1992 Vehicles)
Master Enable Circuit Intermittent Fault (1991-1993 Vehicles)
Line Pressure Actuator Circuit Intermittent Fault
TCC Actuator Circuit Intermittent Fault
2nd Gear Actuator Circuit Intermittent Fault
3rd Gear Actuator Circuit Intermittent Fault
4th Gear Actuator Circuit Intermittent Fault

91
92

93
94
95
96
97
98
99

Flag
Flag

Flag
Flag
Flag
Flag
Flag
Flag
Flag

16

AUTOMATIC TRANSMISSION SERVICE GROUP

Technical Service Information

Note: Refer to page 105 for 1996 and Up Trouble Codes

THE PCM WIRING IDENTIFICATION

PCM

The Powertrain Control Module (PCM) is partitioned to 
control both the engine and transaxle management. When 
the engine side of the PCM is discussed, it is often referred 
to as PCM/EC for Engine Control. When the transaxle side 
of the PCM is discussed, it is often referred to as PCM/TC 
for Transaxle Control. This PCM is located behind the left 
hand side of the dash as shown in Figure 21. The PCM has 
3 electrical connectors plugging into it as shown in Figure 
22. They are referred to as the J1, J2 and J3 connectors. The 
J1 and J2 connectors primarily handle the engine related 
electrical  inputs  and  outputs. The  J3  connector  contains 
most of the transaxle inputs and outputs. 

The J1 connector has 2 rows of pins with 16 pins in each 
row.  One row is labeled "C" while the other row is labeled 
"D" (See Figure 23).  The connector is BROWN in color 
for 1991 to 1992 TBI vehicles and BLUE for MFI vehicles. 
1993  and  up  the  connector  color  went  to  PINK  on  TBI 
vehicles and LIGHT BLUE on MFI vehicles. 

The J2 connector also has 2 rows of pins but with 12 pins in 
each row. One row is labeled "A" while the other row is 
labeled  "B"  (See  Figure  24).    The  color  code  of  the  J2 
connector is the same as the J1 connector for the exception 
of 1991 and 1992 MFI vehicles, it will be BLACK in color. 
Even though the J1 and J2 connectors may be the same in 
color  in  most  vehicles,  they  can  be  easily  distinguished 
since one has a total of 32 pins and the other having 24 pins. 

J1

J2

J3

Figure 21

The J3 connector is also a 32 pin connector with 2 rows of 
16  pins.  One  row  is  labeled  "E"  while  the  other  row  is 
labeled "F" (See Figure 25). This connector is GREEN in 
color  for  all  models  and  years.  Starting  on  page  21 
beginning  with  Figure  26  are  illustrations  of  the  J3 
Connector wiring diagrams for transaxle related inputs and 

Figure 22

ATSG

 MANUALS AND BULLETINS

NOW AVAILABLE ON CD-ROM

Call (800) 245-7722 For Details

17

AUTOMATIC TRANSMISSION SERVICE GROUP

Technical Service Information

Figure 23

J1 Connector Pinout

18

AUTOMATIC TRANSMISSION SERVICE GROUP

Technical Service Information

Note: Connector shown above is for models up to and including 1994