Pontiac Fiero 1988 Service Manual page 484

DRIVEABILITY AND EMISSIONS - FUEL INJECTION (TBI) 6E2-A-29
CODE 14
COOLANT TEMPERATURE
SENSOR CIRCUIT
(HIGH TEMPERATURE INDICATED)
2.5L "P" SERIES (TBI)
DOES "SCAN" DISPLAY 130°C OR HOTTER?
YES
NO
©
DISCONNECT SENSOR.
"SCAN" SHOULD DISPLAY TEMP. BELOW -30°C.
DOES IT?
CODE 14 IS INTERMITTENT. IF NO
ADDITIONAL CODES WERE STORED, REFER
TO "DIAGNOSTIC AIDS" ON FACING PAGE.
YES
NO
FAULTY SENSOR. CKT 410 SHORTED TO GROUND.
OR
CKT 410 SHORTED TO SENSOR GROUND CIRCUIT.
OR
FAULTY ECM.
DIAGNOSTIC AID
COOLANT SENSOR
TEMPERATURE TO RESISTANCE VALUES
(APPROXIMATE)
°F
°C OHMS
210 100 185
160 70 450
100 38 1,800
70 20 3,400
40
4
7,500
20 -7 13,500
0 -18 25,000
-40 -40 100,700
CLEAR CODES AND CONFIRM "CLOSED LOOP" OPERATION AND NO "SERVICE ENGINE SOON" LIGHT.
4-28-87
• 7S3055-6E