Pontiac Fiero 1988 Service Manual page 639

E3-A-56 DRIVABILITY AND EMISSIONS - FUEL INJECTION (PORT)
CODE 51
CODE 52
CODE 53
CODE 55 CODE 51
2.8L "P" SERIES (PORT)
PROM ERROR
CHECK THAT ALL PINS ARE FULLY INSERTED IN THE SOCKET. IF O K , REPLACE
P R O M , CLEAR M E M O R Y , AND RECHECK. IF CODE 51 REAPPEARS, REPLACE ECM.
CLEAR CODES AND CONFIRM " C L O S E D L O O P " OPERATION AND NO "SERVICE ENGINE S O O N " LIGHT.
CODE 52
CALPAK ERROR
(FAULTY OR MISSING CALPAK)
CHECK THAT ALL PINS ARE FULLY INSERTED IN THE SOCKET. IF O K , REPLACE
C A L P A K , CLEAR MEMORY. AND RECHECK. IF CODE 52 REAPPEARS, REPLACE ECM.
CLEAR CODES AND CONFIRM " C L O S E D L O O P " OPERATION AND NO "SERVICE ENGINE S O O N " LIGHT.
CODE 53
SYSTEM OVER VOLTAGE
THIS CODE INDICATES THERE IS A BASIC GENERATOR P R O B L E M .
• CODE 53 WILL SET IF VOLTAGE AT ECM TERMINAL B2 IS GREATER THAN 17.1 VOLTS FOR 2 SECONDS .
• CHECK AND REPAIR CHARGING S Y S T E M . SEE SECTION 6D .
CLEAR CODES AND CONFIRM " C L O S E D L O O P " OPERATION AND NO "SERVICE ENGINE S O O N " LIGHT.
CODE 55
ECM ERROR
BE SURE ECM GROUNDS ARE OK. IF OK
REPLACE ELECTRONIC CONTROL MODULE (ECM)
CLEAR CODES AND CONFIRM " C L O S E D L O O P " OPERATION AND NO "SERVICE ENGINE S O O N " LIGHT. 11-19-86
* 5 S 1 5 1 6 - 6 E