Under hood,passenger side mounted on the firewall,but ...
Could be something else ,crank sensor or cam,or ign.rotor ect.
The module like 3 hundred bucks.Try this ,turn the key
on-off-on-off-on( without out hitting the starter) the check
engine light should begin to flash.
Here is a code list,may narrow down the problem.
Diagnostic Trouble Code Descriptions and service
hints.
Fault
Code
DRB Display
Code Description. Service hints.
11
No Crank reference
signal at PCM
No Distributor reference signal detected during engine cranking. Check the
circuit between the distributor and PCM.
12
Battery Disconnect
Direct Battery input to PCM disconnected within last 50 ignition key-on
cycles. Normal if battery has been disconnected, otherwise check battery power
and ground connections.
13**
No change in MAP
from start to run
No difference seen between the engine MAP reading and the barometric
(atmospheric) pressure reading at startup. Indicates a problem with the MAP
sensor vacuum system.
14**
MAP sensor voltage
too low or too high
MAP sensor voltage output is outside the acceptable range.
15**
No Vehicle
speed sensor signal
No signal received from the vehicle speed sensor during road load
operation.
17*
Engine is cold too long
Engine temperature too high or too low while traveling. Check coolant level,
radiator cap, temperature sensor, and thermostat.
21**
O2S Stays at center
O2S shorted to voltage
O2 sensor does not detect rich or lean condition, or O2 sensor input voltage
too high. DRB will indicate which side with dual sensors. The O2 sensor signal
should fluctuate under normal conditions.
22**
ECT sensor voltage
too high or too low
Engine Coolant temperature sensor input out of normal range. Check engine
temperature sensor.
23**
Intake air temp sensor
voltage too high or low
Intake air manifold temperature sensor is out of range. Check
sensor.
24**
Throttle position sensor
voltage too high or low
TPS sensor is out of normal range.
25**
Idle air control motor
circuits
A short is detected in one or more of the idle air motor circuits.
27*
Injector # control circuit
Injector number # output driver circuit does not respond to the control
signal. Check the affected circuit.
31**
EVAP Solenoid Circuit
Short or open in the EVAP solenoid circuit. Check for loose, broken, or
shorted wire in the charcoal canister purge solenoid wiring and
connectors.
32**
EGR Solenoid circuit
Short or open in the EGR solenoid circuit. Check for loose, broken, or
shorted wire in the EGR valve wiring and connectors. Possible air fuel ratio
imbalance not detected during diagnosis.
33*
AC clutch relay circuit
Short or open in the AC clutch circuit.
34*
Speed control circuit or
speed control switch
always low or high
An open or short in the speed control vacuum or vent circuits. Speed control
switch input above or below normal range.
35
Radiator Fan low
speed relay circuit
Open or short in the radiator fan relay wiring.
37**
Torque converter clutch
solenoid CKT or
Trans temp sensor
too high or low
Open or short in CKT wiring or connectors. Voltage out of range at
transmission temperature sensor input. See NOTE #1 below
41**
Generator field not
switching properly
Open or short in the generator (alternator) field control (regulator)
circuit. This indicates a problem with the charging circuit and the fault is set
when the battery voltage from the ASD relay falls below 11.75 volts. Wiring,
connectors, fuses, and the ASD relay should be checked. A shorted battery cell
can also trigger this fault.
42*
Auto shutdown
relay circuit
Open or short in the ASD relay wiring or connectors.
43**
Ignition coil circuit #
Open or short in number # coil circuit. Indicates that the ignition coil's
peak primary circuit current is not achieved with the maximum dwell
time.
44*
Battery temp sensor
volts out of range
An open or short in the engine coolant temperature sensor circuit or a
problem in the PCM's battery temperature circuit.
45*
Trans OD
solenoid circuit
Transmission OD solenoid circuit failure. Open or short in the transmission
overdrive solenoid circuit.
46**
Charging system
voltage too high
Battery voltage sense input above target charging voltage during engine
operation. Computer is indicating that the battery voltage is not being
regulated.
47**
Charging system
voltage too low
Battery voltage sense input above target charging voltage during engine
operation. Also, no significant change in battery voltage was detected during a
test of the generator output.
51**
System lean L-Idle
Adap at rich limit
or lean R-Idle
Adap at rich limit
O2 sensor signal indicates lean air/fuel ratio during engine operation. The
computer ran the mixture to the rich limit of programming, but the O2 sensor
still indicated a lean condition. L or R indicate left or right side O2 sensor.
Fuel pressure problems can lean the mixture and set this fault.
52**
System rich L-Idle
Adap at lean limit
or rich R-Idle
Adap at lean limit
O2 sensor signal indicates rich air/fuel ratio during engine operation. The
computer ran the mixture to the lean limit of programming, but the O2 sensor
still indicated a rich condition. L or R indicate left or right side O2 sensor.
Faulty ignition components, high or low fuel pressure, or leaking injectors can
set this fault.
53*
Internal PCM failure
or PCM SPI comm
failure
An internal PCM failure or PCM communications failure has been
detected.
54*
No cam sync signal
at PCM
No fuel sync (camshaft signal) detected during engine crank. No camshaft
position sensor signal was received from the distributor. Problem with the
distributor synchronization circuit.
55
N/A
End of message code. A DTC 55 is used to end all DTC messages. This code
does not show on the DRB tool and indicates a completion of the stored codes on
the Malfunction Indicator Lamp (check engine lamp).
62*
PCM failure
SRI miles not stored
Unsuccessful attempt to update Service Reminder Indicator miles in the PCM
EEPROM (memory).
63*
PCM Failure
EEPROM write denied
Unsuccessful attempt to write and EEPROM location by the PCM. Controller
failure, check the PCM. This code can be set when attempting an unauthorized
reprogram of the PCM.
71**
Aux 5V signal
voltage low
The auxiliary 5 volt supply output voltage is low. The 5 volt output signal
is not reaching the required voltage level.
72**
Catalytic Converter
efficiency failure
The catalytic converter is not converting emissions in the proper
ratio.
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