ECM Diagnostic Codes

CODE	Circuit Affected	CODE	Circuit Affected
12	No Distributor (TACH) Signal	44	Lean Exhaust Signal
13	O2 Sensor Not Ready	45	Rich Exhaust Signal
14	Shorted Coolant Sensor Circuit	51	PROM Error Indicator
15	Open Coolant Sensor Circuit	52	ECM Memory Reset Indicator
16	Generator Volatage Out Of Range	53	Distributor Signal Interrupt
18	Open Crank Signal Circuit	60	Transmission Not In Drive
19	Shorted Fuel Pump Circuit	63	Car And Set Speed Tolerance Exceeded
20	Open Fuel Pump Circuit	64	Car Acceleration Exceeds Maximum Limit
21	Shorted Throttle Position Sensor Circuit	65	Coolant Temperature Exceeds Maximum Limit
22	Open Throttle Position Sensor Circuit	66	Engine RPM Exceeds Maximum Limit
23	EST/Bypass Circuit Problem	67	Shorted Set Or Resume Circuit
24	Speed Sensor Circuit Problem	.7.0	System Ready For Further Tests
26	Shorted Throttle Switch Circuit	.7.1	Cruise Control Brake Circuit Test
27	Open Throttle Switch Circuit	.7.2	Throttle Switch Circuit Test
28	Open Fourth Gear Circuit	.7.3	Drive (ADL) Circuit Test
29	Shorted Fourth Gear Circuit	.7.4	Reverse Circuit Test
30	ISC Circuit Problem	.7.5	Cruise On/Off Circuit Test
31	Shorted MAP Sensor Circuit	.7.6	"Set/Coast" Circuit Test
32	Open MAP Sensor Circuit	.7.7	"Resume/Accelleration" Circuit Test
33	MAP/BARO Sensor Correlation	.7.8	"Instant/Average" Circuit Test
34	MAP Signal Too High	.7.9	"Reset" Circuit Test
35	Shorted BARO Sensor Circuit	.8.0	A/C Clutch Circuit Test
36	Open BARO Sensor Circuit	-1.8.8	Display Check
37	Shorted MAT Sensor Circuit	.9.0	System Ready To Display Engine Data
38	Open MAT Sensor Circuit	.9.5	System Ready for Output Cycling Or In Fixed Spark Mode
39	TCC Engagement Problem	.9.6	Output Cycling
		.0.0	All Diagnostics Complete