Pontiac Fiero 1988 Service Manual page 656

DRIVEABILITY AND EMISSIONS - FUEL INJECTION (PORT) 6E3-C1-7
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pTI R E F E R E N C E E N D
f T I
P R O M
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P R O M C A R R I E R
4S 0465-6E
Figure C 1 - 1 0 PROM in PROM Carrier
i n s t a l l o r C o n n e c t
1. New PROM carrier in PROM socket.
2. CALPAK In CALPAK socket.
Important
Small notch of carrier should be aligned with
small notch in socket. Press on PROM carrier until it
is firmly seated in the socket. Do not press on PROM,
only the carrier.
3. Access cover on ECM.
4. ECM in passenger compartment.
5. Connectors to ECM.
Functional Check
1. Turn ignition "ON".
2. Enter diagnostics (see Diagnostic Circuit Check
for procedure).
A. Code 12 should flash at least four times. (No
other codes present). This indicates the PROM
and CALPAK are installed properly.
B. If trouble Code 51 occurs or if the "Service
Engine Soon" light is on constantly with no
codes, the PROM is not fully seated, installed
backwards, has bent pins, or is defective. If
Code 52 occurs, the CALPAK is not fully
seated, installed backwards, had bent pins, or
is defective.
• If not fully seated, press firmly on PROM
or CALPAK carrier.
• If it is necessary to remove the PROM,
follow instructions.
• If installed backwards, REPLACE THE
PROM. The CALPAK may be removed
and reinstalled correctly.
• If pins bend, remove PROM or CALPAK,
straighten pins, and reinstall. If bent pins
break or crack during straightening,
discard PROM OR CALPAK and replace
it.
GRASP CALPAK
CARRIER AT
NARROW ENDS
ONLY
fTI CALPAK
IT1REMOVALTOOL
5 S 1 5 2 6 - 6 E
Figure C 1 - 1 1 Removing CALPAK
Important
Any time the PROM is installed backwards and
the ignition switch turned on, the PROM is destroyed.
COOLANT SENSOR
NOTICE:
Care must be taken when handling
coolant sensor. Damage to coolant sensor
will affect proper operation of the Fuel
Injection system.
Remove or Disconnect
1. Negative battery cable.
2. EGR Solenoid bracket.
3. Electrical connector.
4. Carefully back out coolant sensor.
Install or Connect
1. Sensor in engine.
2. Electrical connector.
3. EGR Solenoid bracket.
4. Negative battery cable.
MAP SENSOR
Other than checking for loose vacuum hose and
electrical connection, the only service possible is unit
replacement if diagnosis shows sensor to be faulty.
Figure Cl-12 shows location and replacement of
manifold absolute pressure (MAP) sensor.
MAT SENSOR
Replacement of the manifold air temperature
(MAT) Sensor, mounted in the air cleaner assembly,
uses the same procedure as for the coolant sensor