Error codes p030 and p071

Code P030, see image. 071, see below
ENGINE CONTROLS - TESTS W/CODES - 4.6L -1995 Cadillac Seville SLS
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CODE P071, INTERMITTENT MAP SENSOR SIGNAL

This test monitors TP sensor, RPM, MAP, EGR flow and A/C clutch status. If MAP changes rapidly and all other parameters remain constant, Code P071 will set. Engine operation requires a large change in
manifold pressure must be preceded by a change in throttle angle.
Test Conditions

Codes P021 and P022 not set. TP sensor does not change more than 1.0 degree for 1.01 seconds. Engine speed does not change more than 500 RPM for 1.01 seconds. EGR does not change more than 4 percent
for 1.01 seconds. A/C clutch not commanded on or off. Traction control not active and PCM receiving reference pulses from ICM at least every.3 seconds.
Failure Conditions

MAP sensor reading changes more than 6.3 kPa in 12.5 milliseconds (.0125 second).
Action

PCM uses substitute MAP value based on engine RPM and throttle position switch status.
NOTE:
Test numbers refer to numbers on diagnostic chart. Reference to CHART 3 refers to POWERTRAIN CHARTS.
1. 2. 3.
Checks if MAP can read BARO pressure correctly (87-105 kPa). Checks MAP sensor's ability to react to a known vacuum (26-34 kPa).
Checks MAP sensor's ability to react to sudden change in vacuum.
Fig. 150: Code P071 Schematic - 1 Of 2, Intermittent MAP Sensor Signal Courtesy of GENERAL MOTORS CORP.
Fig. 151: Code P071 Schematic - 2 Of 2, Intermittent MAP Sensor Signal Courtesy of GENERAL MOTORS CORP.
Fig. 152: Code P071 Diag. Flow Chart, Intermittent MAP Sensor Signal Courtesy of GENERAL MOTORS CORP.

1/30/2012