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Home >> Cadillac >> 1990 >> Allante F7/ME9 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> ECM DTC EO13: Right O2 Sensor Not Ready >> Action Taken

Action Taken

ECM turns on the "Service Engine Soon" telltale; closed loop operation will he disabled.

NOTE: The following step numbers refer to circled numbers on diagnostic chart. See Fig 1 . For circuit identification, see Figure .
  1. A voltage of .42 to .48 voltage displayed is a reference from the ECM. The Oxygen Sensor must generate a .15 volts greater than the .45 reference to register a Oxygen Sensor Cross Count in the ECM.
  2. The ECM compares voltage on CKT 412 to the ground on CKT 413. It is essential that the oxygen sensor ground and ECM ground on pin E15 are at the same voltage potential with the engine running.
Fig 1: Identifying ECM DTC EO13: Right O2 Sensor Not Ready Flow Chart
G00114201Courtesy of GENERAL MOTORS CORP.
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