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| Diagnostic Codes |
FOR 1995
AND EARLIER MODELS
[click
here for a printer friendly version]
Is your car acting funny? Lights on the dash flashing?
Don't have the cash to take it to the Saturn dealer? Well you
are in luck. Just grab yourself a piece of wire and a pad paper,
print out this page, and crawl under the dash. Your car is about
to tell you what is wrong with her.
This is a quick down and dirty method for you
to tell what system is malfunctioning, or if it is your computer
that has gone haywire.
Picture Courtesy of Haynes
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Make sure the engine is OFF.
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Get a short piece of wire with both ends stripped.
Look under the dashboard on the drivers side. You should see
an electrical connector on the bottom of the dash near the
door. This is the ALDL (Assembly Line Data Link). Remove the
cover (if equipped) by sliding it toward you.
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Refer to the diagram above, and jump terminal
(A) and terminal (B) with the wire. Then sit in the drivers
seat, and turn the ignition on. DO NOT START THE CAR.
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Watch the check engine light. The PCM should
flash a "Code 12". This means that the check engine
light will flash once, then pause, then flash twice. It will
repeat this cycle three times. If no other codes are stored,
then the PCM will continue to flash "Code 12" until
the ignition is turned off, or the jumper wire is removed.
If there are any codes stored, then after flashing "Code
12" three times, the PCM will flash them from lowest
to highest in number. Each code will be flashed three times,
with the exception of "Code 11". This will be flashed
last. After flashing "Code 11" (transaxle trouble
code) on the check engine light, the PCM will flash the codes
for the transaxle on another dash light. (SHIFT TO D2 on '91
and '92 models, and HOT on '93 and later) Refer to the second
table for explanation of these codes.
If the PCM sets a trouble code, the SERVICE ENGINE
SOON light will come on. This code will then be stored in the
memory. If the problem is intermittent, then the light will go
out 10 seconds after the fault goes away. The code will then be
stored in the memory until power is lost to the PCM. Removing
power to the PCM for 10 seconds or more will clear all stored
trouble codes. Trouble codes should only be cleared after repairs
have been made.
CAUTION: To
prevent damaging your PCM, the ignition switch must be off when
removing power to the PCM.
|
Engine
Trouble Codes |
|
11 |
Transaxle trouble codes.
See the above description. |
|
12 |
Indicates that system is ready and will
begin flashing engine codes |
|
13 |
Oxygen sensor circuit. Sensor wires may
be loose, or sensor may need to be replaced. |
|
14 |
Coolant sensor/high temperature. |
|
15 |
Coolant sensor/low temperature. |
|
17 |
PCM fault. Replace PCM |
|
19 |
PCM and or ignition module may be defective.
Check all connectors and grounds. Replace if necessary. |
|
21 |
Throttle position sensor, voltage high.
Check for sticking or misadjusted TPS plunger. Check connections |
|
22 |
Throttle position sensor, voltage low. Check
TPS adjustment and PCM connector. Replace TPS if necessary. |
|
23 |
IAT circuit low. Intake Air Temp sensor
may be faulty. Check connector. |
|
24 |
Vehicle Speed Sensor circuit, no signal.
This code should only be set while the vehicle is in motion.
If not, then disregard. Check VSS and PCM. |
|
25 |
IAT Circuit, temperature out of range. Temp
excessive causing a misread by the PCM. |
|
26 |
Quad driver output fault. PCM detects an
improper voltage level on the circuit connected to the
Quad Driver Module. |
|
32 |
EGR system fault. Vacuum switch shorted
to ground on start-up, switch not closed after the PCM
has commanded the EGR for a specified period of time or
the EGR solenoid circuit is open for a specified amount
of time. Replace the EGR valve. |
|
33 |
MAP circuit, voltage out of range high.
Check vacuum hoses from the MAP sensor. Check the electrical
connections on the PCM. Replace the MAP sensor. |
|
34 |
MAP circuit, voltage out of range low. Signal
voltage from the MAP sensor too low. Check MAP sensor
circuit, and TPS sensor circuit. |
|
35 |
Idle Air Control, RPM out of range. IAC
motor possibly defective. Have the system diagnosed by
retailer service department. |
|
41 |
Ignition Control Circuit, open or shorted.
Possible defective ignition module. |
|
42 |
Bypass Circuit, Open or shorted. |
|
41 and 42 |
IC control circuit grounded/bypass open.
Bypass circuit and/or ignition control circuit shorted
causing no feedback pulses for the ignition cycle. |
|
43 |
Knock sensor circuit open or shorted. Possible
loose or defective knock sensor. Check the knock sensor
circuit. |
|
44 |
Oxygen Sensor indicates lean exhaust. Check
for vacuum leaks around the throttle body gasket, vacuum
hoses or the intake manifold gasket. Check connections
to the PCM. Replace oxygen sensor if necessary. |
|
45 |
Oxygen Sensor indicates rich exhaust. Possible
rich or leaking injector, high fuel pressure, or faulty
TPS or MAP sensor. Also check the charcoal canister and
components for presence of fuel. Replace oxygen sensor
if necessary. |
|
46 |
Power steering pressure circuit (91 models
only), open or shorted. Possible defective power steering
pressure switch. Also check the circuit to the switch. |
|
49 |
High idle indicates vacuum leak. Check all
hoses to MAP sensor, PCV valve, brake booster, fuel pressure
regulator, throttle body, intake manifold gasket, and
any other vacuum lines. |
|
51 |
PCM memory error. Possible defective PCM.
Have vehicle diagnosed by a retailer service department. |
|
55 |
A/D Error. Defective PCM. Have vehicle diagnosed
by a retailer service department. |
|
81 |
ABS message fault (93 vehicles only) Defective
ABS module. Have vehicle diagnosed by a retailer service
department. |
|
82 |
PCM internal communication fault. Defective
PCM. Have vehicle diagnosed by a retailer service department. |
|
Transaxle
Trouble Codes |
|
13 |
Line pressure high. (92 and later models
only) Possible stuck regulator valve in the valve body. |
|
14 |
Line pressure low. (93 and later models
only) Possible pump problem or a restriction in the sump
suction filter. |
| 16 |
No first gear. Possible damaged first gear
hub seal rings. |
| 18 |
No gears available (93 and later models)
Possible misadjusted shift cable. |
| 21 |
Second gear stuck ON. Possible internal
hydraulic leak from seals, gaskets, or porosity. |
| 22 |
No second gear. Possible servo piston installed
incorrectly. |
| 23 |
No third gear. Possible cross leak to another
clutch pack. |
| 24 |
No fourth gear. Possible hydraulic leak
in fourth or a failed clutch pack. |
| 25 |
No TCC (Tourque converter clutch) Possible
poor electrical connection on the PCM/TC, actuator connector
plate, or the UHJB terminals. |
| 26 |
TCC stuck ON. TCC release circuit may be
leaking at the seal ring on the input shaft. |
| 31 |
Transaxle temperature circuit open (cold)
Possible defective circuit or sensor. |
| 32 |
Transaxle temperature circuit grounded (hot)
Possible wiring harness problem. |
| 34 |
ECM communications failure. (92 and later
models) Possible PCM/TC failure. |
| 35 |
No turbine speed signal. Possible defective
turbine speed sensor, and or circuit. |
| 36 |
Turbine speed signal noise. Possible defective
turbine speed sensor. |
| 41 |
No vehicle speed sensor signal. Possible
defective VSS or circuit. |
| 42 |
Vehicle speed sensor noise. Possible loose
connection on PCM /TC, open circuit to VSS or defective
VSS |
| 43 |
Master enable relay grounded/open (93 and
later models) Possible defective master enable relay,
or it's circuit. |
| 44 |
Master enable relay coil shorted to voltage
(93 and later models) Possible defective master enable
relay, or it's circuit. |
| 45 |
Selector Switch, No data. Possible disconnected
selector switch. |
| 46 |
Park/Neutral Switch, Invalid data. (92 and
later models) Possible misadjusted gear selector switch. |
| 48 |
Hold mode, voltage low. Possible defective
PCM/TC. |
| 49 |
Park/Neutral Switch, Invalid data. (92 and
later models) Possible misadjust gear selector switch. |
| 52 |
Hold mode stuck on. (91 and 92 models only)
Possible defective PCM/TC. |
| 53 |
Hold mode stuck off. (91 and 92 models only)
Possible defective PCM/TC. |
| 54 |
AD error. Possible defective PCM/TC. |
| 55 |
Transaxle temperature resistor failure.
Possible defective PCM/TC. |
| 56 |
Generic field - effect transistor driver
failure. Possible defective PCM/TC. |
| 75 |
Third Gear stuck ON (93 and later models)
Possible cross leaks from third gear clutch oil passages. |
| 78 |
Fourth Gear stuck ON. (93 and later models)
Possible internal cross leaks from third gear into another
clutch pack. |
If you have any questions about any of
the codes your PCM has flashed, then call your retailer service
department. If you feel uncomfortable with any mechanical procedures,
then please take your vehicle to a certified mechanic.
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