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Trouble Code Component Identification

ECM TROUBLE CODE IDENTIFICATION

Code Circuit Affected
12 (1)
13 Open oxygen sensor circuit.
14 Coolant sensor circuit shorted.
15 Coolant sensor circuit open.
21 TPS signal voltage high.
22 TPS signal voltage low.
23 M/C solenoid circuit open or grounded.
24 VSS circuit.
24B Park/Neutral Switch.
25 MAT sensor signal voltage low.
34 MAP sensor voltage too low.
34 MAF sensor frequency low (Fuel Injection).
35 ISC switch circuit shorted.
43 ESC retard signal too low.
44 Lean oxygen sensor value.
45 Rich oxygen sensor value.
51 Faulty PROM, PROM installation or ECM.
52 Faulty CALPAC.
53 EGR vacuum control (carb. models).
54 M/C solenoid high (carb. models).
55 Faulty ECM.
(1) "12" will display only if no reference pulses are received by the ECM; it will never be stored as a malfunction.