I have a 99 cadillac deville and had it put on the machine to get it tested..the codes came back as P0147, P1377, P1323, and P0146. can someone please tell me what these codes mean
Cars & Trucks - Cadillac - DeVille - 1999 Cadillac DeVille
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Answers & Comments
Is that PO377 & PO323 ?
P0146:
- Open in CKT 1668 or 1669.
- Short to voltage on CKT 1668 or 1669.
- Oxygen sensor that malfunctions.
- An ineffective oxygen sensor heater.
- A poor HO2S ground.
O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 3)
The PCM provides a 0.45 volt reference to the oxygen sensor on CKT 1668. When the Oxygen Sensor reaches operating temperature it will generate a counter voltage that will vary based on the amount of oxygen in the exhaust. The post-converter heated oxygen sensor is located in the exhaust after the catalytic converter. A lean exhaust will generate a low voltage and cause the 0.45 reference to move lower. A rich exhaust will generate a high voltage and cause the 0.45 reference to move higher. If the oxygen sensor cannot respond under the test conditions and generate a voltage greater than 0.609 volt or less than 0.307 volt, it will set a DTC P0146. Possible causes of DTC P0146 are:
P0147 :O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 3)
This diagnostic test is used to determine if the heating element in the post-converter oxygen sensor is operating properly. An oxygen sensor acts as a battery because it creates its own voltage once it reaches operating temperature. This voltage is produced when the oxygen content in the exhaust stream is different than that in the atmosphere. The heating element is energized through CKT 139 when the ignition is ON and allows the oxygen sensor to reach operating temperature quickly. This in turn allows the PCM to enter Closed Loop fuel control quicker. When cold the voltage that the PCM measures on the HO2S HI and LOW inputs is called bias voltage. If it takes too long for the HO2S to vary above or below the bias voltage within a specific time since key ON DTC P0147 will set
P1323:IC 24X Referance Circut Low Frequency
The Ignition Control Module creates a 4X signal and a 24X signal that is used by the PCM for ignition and fuel control. In this diagnostic test, the PCM checks for 4X reference pulses being received without 24X reference pulses. When the engine is running and the PCM is receiving 4X reference pulses without 24X reference pulses and the 24X reference signal line is low for 4 seconds, DTC P1323 is set.
P01377:IC Cam Pulse To 4X Referance
This diagnostic test checks to see if there are eight 4X reference pulses between CAM signals. Do not attempt diagnosis or repair unless the customer is experiencing driveability problems associated with this DTC.
Hope this helps!