2002 Cadillac STS Trouble codes

Tiny
CEPAPA
  • MEMBER
  • 2002 CADILLAC STS
  • V8
  • 2WD
  • AUTOMATIC
  • 97,765 MILES
What means trouble codes :
p1106
p0574
p1189

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Friday, September 24th, 2010 AT 12:19 PM

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Tiny
FACTORYJACK
  • EXPERT
DTC P1106
Circuit Description
The manifold absolute pressure (MAP) sensor responds to pressure changes in the intake manifold. The pressure changes occur based on the engine load. The MAP sensor has the following circuits:

" 5-volt reference circuit

" Low reference circuit

" MAP sensor signal circuit

The powertrain control module (PCM) supplies 5 volts to the MAP sensor on the 5-volt reference circuit. The PCM also provides a ground on the low reference circuit. The MAP sensor provides a signal to the PCM on the MAP sensor signal circuit which is relative to the pressure changes in the manifold. The PCM should detect a low signal voltage at a low MAP, such as during an idle or a deceleration. The PCM should detect a high signal voltage at a high MAP, such as the ignition is ON, with the engine OFF, or at a wide open throttle (WOT). The MAP sensor is also used in order to determine the barometric pressure (BARO). This occurs when the ignition switch is turned ON, with the engine OFF. The BARO reading may also be updated whenever the engine is operated at WOT. The PCM monitors the MAP sensor signal for voltage outside of the normal range.

If the PCM detects a MAP sensor signal voltage that is intermittently high diagnostic trouble code (DTC) P1106 will set.

Conditions for Running the DTC
" DTCs P0121, P0122, or P0123 are not set.

" The throttle angle is less than 98 percent when engine speed is more than 1,000 RPM.

OR

" The throttle angle is less than 90 percent when engine speed is less than 1,000 RPM.

Conditions for Setting the DTC
The MAP sensor voltage is more than 4.5 volts for less than 1 second.

Action Taken When the DTC Sets
" The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.

" The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

DTC P0574
Circuit Description
The cruise control module uses the cruise engaged circuit to request cruise control. If improper conditions are present, the PCM will disable cruise control via the cruise inhibit control circuit. During cruise control, if the PCM detects a vehicle speed above the calibrated value, the PCM will inhibit the cruise control system, and set DTC P0574.

Conditions for Running the DTC
" The cruise control is enabled.

" The cruise control is engaged.

Conditions for Setting the DTC
The PCM detects a vehicle speed above 176 km/h (110 mph).

Action Taken When the DTC Sets
" The PCM disables the cruise control.

" The PCM will not illuminate the malfunction indicator lamp (MIL).

" The PCM will store the conditions present when the DTC set as Fail Records data only.

DTC P1189
Circuit Description
With low oil pressure, the engine oil pressure switch closes, and the signal circuit is low. With oil pressure above 4.5 psi, the engine oil pressure switch opens, and the signal circuit is high. The PCM monitors the oil pressure switch signal circuit and sends a class 2 message to the IPC indicating the switch status.

Conditions for Running the DTC
" DTC P0117 is not set.

" DTC P0118 is not set.

" DTC P1111 is not set.

" DTC P1114 is not set.

" The ignition is ON, with the engine OFF.

" Engine temperature at the last shutdown was at least 80 C (176 F).

Conditions for Setting the DTC
" The PCM detects that the oil pressure switch signal circuit is high.

" The above condition is present for greater than 10 seconds.

Depending on what your symptom is, will determine the couse of action. The latter of the three codes will give no visual indication, and the cruise fault may set from the 1106. I would clear them and see what returns.
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Saturday, September 25th, 2010 AT 1:24 PM

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