Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCADILLAC1997SEVILLE SLS V8-4.6L VIN YREPAIR AND DIAGNOSISRELAYS AND MODULESRELAYS AND MODULES - POWERTRAIN MANAGEMENTRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULESERVICE AND REPAIRREMOVAL
1997 Cadillac Seville SLS V8-4.6L VIN Y
Removal
1997 Cadillac Seville SLS V8-4.6L VIN YSECTION Removal
Removal Procedure
Notice: To prevent internal PCM damage, the ignition switch must be in the LOCK position when disconnecting or reconnecting power to the PCM, as when battery cables, PCM connectors or fuses are connected or disconnected. Due to system requirements, the ignition switch powers the PCM ON in all key positions except LOCK.
Notice: Numbers in text correspond to numbered components in image.
1. Record the Transaxle Fluid and Engine Oil Life Left Indexes.
Important: The key must be in the LOCK position for a minimum of 30 seconds prior to disconnecting power to the PCM. This is to allow the PCM to store the Transaxle fluid life transaxle shift adapts and Throttle Position Learned value into the EEPROM. Failure to wait the 30 seconds may result in a EEPROM reset and the Transaxle fluid life being reset to 0.
2. Disconnect the negative battery cable.
3. Remove the gusset (brace) from between the LH fender and the radiator core support by removing the 5 attaching bolts.
4. Loosen the Intake Air duct clamp at the MAF sensor and the air cleaner assembly.
5. Remove the Intake Air duct.
6. Disconnect the IAT sensor connector.
7. Remove the air cleaner assembly (1) from the air inlet housing (2).
8. Lift the air inlet assembly (1) onto the radiator core support area by pulling firmly straight up.
9. Open the air inlet housing (4) to gain access to the PCM (2).
10. Loosen the connector attaching bolts.
11. Disconnect both PCM connectors (1 and 5).
^ If installing a replacement PCM the KS module will have to be transferred from the original PCM to the replacement PCM. Refer to Knock Sensor Module.
^ If installing a replacement PCM the PCM Isolators (3) will have to be transferred to the replacement PCM.
Notice: To prevent internal PCM damage, the ignition switch must be in the LOCK position when disconnecting or reconnecting power to the PCM, as when battery cables, PCM connectors or fuses are connected or disconnected. Due to system requirements, the ignition switch powers the PCM ON in all key positions except LOCK.
Notice: Numbers in text correspond to numbered components in image.
1. Record the Transaxle Fluid and Engine Oil Life Left Indexes.
Important: The key must be in the LOCK position for a minimum of 30 seconds prior to disconnecting power to the PCM. This is to allow the PCM to store the Transaxle fluid life transaxle shift adapts and Throttle Position Learned value into the EEPROM. Failure to wait the 30 seconds may result in a EEPROM reset and the Transaxle fluid life being reset to 0.
2. Disconnect the negative battery cable.
3. Remove the gusset (brace) from between the LH fender and the radiator core support by removing the 5 attaching bolts.
4. Loosen the Intake Air duct clamp at the MAF sensor and the air cleaner assembly.
5. Remove the Intake Air duct.
6. Disconnect the IAT sensor connector.
Air Cleaner Assembly:
7. Remove the air cleaner assembly (1) from the air inlet housing (2).
Air Inlet Housing:
8. Lift the air inlet assembly (1) onto the radiator core support area by pulling firmly straight up.
Accessing PCM:
9. Open the air inlet housing (4) to gain access to the PCM (2).
10. Loosen the connector attaching bolts.
11. Disconnect both PCM connectors (1 and 5).
^ If installing a replacement PCM the KS module will have to be transferred from the original PCM to the replacement PCM. Refer to Knock Sensor Module.
^ If installing a replacement PCM the PCM Isolators (3) will have to be transferred to the replacement PCM.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.