D I A G N O S I - Pontiac Fiero 1988 Service Manual

DRIVE ABILITY AND EMISSIONS - FUEL INJECTION (TBI) 6E2-A-31
CODE 15
COOLANT TEMPERATURE
SENSOR CIRCUIT
(LOW TEMPERATURE INDICATED)
2,5L
DD
9" SERIES (TIG)
(T)
DOES "SCAN" DISPLAY COOLANT -30°C OR COLDER?
YES NO
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DISCONNECT SENSOR
JUMPER HARNESS TERMINALS TOGETHER
"SCAN" SHOULD DISPLAY 130°C OR MORE.
DOES IT?
CODE 15 IS INTERMITTENT. IF NO
ADDITIONAL CODES WERE STORED, REFER
TO "DIAGNOSTIC AIDS" ON FACING PAGE.
YES
FAULTY CONNECTION OR SENSOR.
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
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NO
I
JUMPER CKT 410 TO GROUND.
"SCAN" SHOULD DISPLAY OVER 130°C.
DOES IT?
YES
H
OPEN SENSOR GROUND
CIRCUIT, FAULTY
CONNECTION OR
FAULTY ECM.
NO
X
OPEN CKT 410, FAULTY
CONNECTION AT ECM, OR
FAULTY ECM.
CLfcAR CODES AND CONFIRM "CLOSED LOOP" OPERATION AND NO "SERVICE ENGINE SOON" LIGHT.
2-11-87
©7S3261-6E