Computer Relearn Procedures — Cadillac DeVille Concours I final (1999-1999)

INTRODUCTION

Vehicles equipped with engine or transmission/transaxle computers may require a computer relearn procedure after the vehicle battery is disconnected. Vehicle computers memorize and store vehicle operation patterns for optimum driveability and performance. When the vehicle battery is disconnected, this memory is lost, resulting in a driveability problem. Depending on the vehicle and how it is equipped, the following driveability problems may exist

Rough or unstable idle.
Hesitation or stumble.
Rich or lean running.
Poor fuel mileage.
Harsh or poor transmission/transaxle shift quality.

Default data is used until NEW data from each key start is stored. As the computer restores its memory from each new key start, driveability is restored.

Driveability problems may occur during the computer relearn stage. To accelerate computer relearn process after battery removal and installation, specified computer relearn procedures should be performed. See appropriate procedures under specified manufacturer.

Note. Before performing Electronically Erasable Programmable Read Only Memory (EEPROM) programming procedure, check for any applicable Technical Service Bulletins (TSBs) that may apply to vehicle application. Body Control Module (BCM) must be programmed with proper Regular Production Option (RPO) configurations. Follow instructions on Techline Terminal and scan tool to program BCM.

ALERO, CUTLASS, GRAND AM & MALIBU

Note. Read all procedures listed to determine why and when each procedure is to be performed before proceeding.

Electronically Erasable Programmable Read Only Memory (EEPROM) Programming (2.4L)

If Powertrain Control Module (PCM) was replaced, the EEPROM in the PCM must be programmed. If EEPROM is not programmed, a Diagnostic Trouble Code (DTC) will be set in the PCM or PCM may be damaged. Perform EEPROM programming using the Techline equipment manufacturer's instructions and latest software applicable for the vehicle model.
Once EEPROM is reprogrammed, the Crankshaft Position (CKP) sensor variation learn procedure must be performed using proper procedure.

Electronically Erasable Programmable Read Only Memory (EEPROM) Programming (3.1L & 3.4L)

If Powertrain Control Module (PCM) was replaced, the EEPROM in the PCM must be programmed. If EEPROM is not programmed, a Diagnostic Trouble Code (DTC) will be set in the PCM.
Ensure battery is fully charged. If battery is being charged, ensure battery charger is disconnected before performing EEPROM programming procedure.
Ensure cable is properly connected on Data Link Connector (DLC). Turn ignition on. Perform EEPROM programming using the Techline equipment manufacturer's instructions and latest software applicable for the vehicle model.
Once EEPROM is reprogrammed, perform powertrain On-Board Diagnostic (OBD) system check. See POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. Ensure engine is idling for one minute before checking for DTCs when performing powertrain OBD system check.

Note. If EEPROM programming fails, ensure all electrical connections on PCM are okay. Check Techline for latest software. If EEPROM programming still fails, replace PCM.

Crankshaft Position (CKP) Sensor Variation Learn Procedure (2.4L)

Procedure must be performed if any of the following have been done or exist: EEPROM was reprogrammed. If Diagnostic Trouble Code (DTC) P1336 exists. If crankshaft, crankshaft position sensor, engine or Powertrain Control Module (PCM) have been replaced. Any repairs have been performed that disturbs the crankshaft or vibration damper to the crankshaft position sensor relationship.
CKP sensor variation compensating values are stored in Powertrain Control Module (PCM) after a learn procedure has been performed. If actual CKP sensor values are not within specification, Diagnostic Trouble Code (DTC) P0300 will be stored in the PCM.
Ensure battery is fully charged. Ensure cable is properly connected on Data Link Connector (DLC). Apply parking brake. Block front wheels. Ensure hood is closed.
Place transaxle in Park or Neutral. Ensure all accessories are off. Start engine and warm engine until engine coolant temperature is at least 185°F (85°C).
Apply service brakes. With engine idling, use scan tool to select and enable CKP sensor variation learn procedure.
Accelerate engine until CKP sensor variation learn procedure fuel cut off is obtained and engine starts to decelerate or cut out. Quickly release throttle to idle position once CKP sensor variation learn procedure is obtained and engine decelerates or cuts out. Once CKP sensor variation values are learned, the PCM will return engine control to the operator and engine will respond to throttle position. CAUTION: Ensure throttle is quickly released to idle position once CKP sensor variation learn procedure fuel cut off is obtained and engine starts to decelerate or cut out.
Using scan tool, verify that CKP sensor variation learn procedure was completed. If CKP sensor variation learn procedure was not completed, go to next step. If CKP sensor variation learn procedure was completed, shut engine off and remove scan tool.
If CKP sensor variation learn procedure was not completed, repeat entire procedure up to 10 times. If PCM will not learn the CKP sensor variation compensating values, a DTC P1336 should be stored in the PCM. Perform test procedures for DTC P1336 and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.

Crankshaft Position (CKP) Sensor Variation Learn Procedure (Alero 3.4L & Grand Am 3.4L)

Procedure must be performed if any of the following have been done or exist: EEPROM was reprogrammed. If Diagnostic Trouble Code (DTC) P1336 exists. If crankshaft, crankshaft position sensor, engine, Powertrain Control Module (PCM) or vibration damper have been replaced.
CKP sensor variation compensating values are stored in Powertrain Control Module (PCM) after a learn procedure has been performed. If actual CKP sensor values are not within specification, Diagnostic Trouble Code (DTC) P0300 will be stored in the PCM.
Using scan tool, check for stored DTCs. If no DTCs exist, or if DTC P1336 exists, go to next step. If any DTCs exist except for P1336, perform test procedures for specified DTC and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. Ensure all DTCs are cleared from PCM. Go to next step.
Ensure ignition is off. Apply parking brake. Block front wheels. Ensure hood is closed. Start engine and warm engine until engine coolant temperature is at least 158°F (70°C). Turn ignition off. NOTE: Ensure engine coolant temperature is at least 158°F (70°C) before performing CKP sensor variation learn procedure.
Apply service brakes. Using scan tool, select and enable CKP sensor variation learn procedure. Follow instructions displayed on scan tool.
If CKP sensor variation learn procedure was not terminated, go to next step. If CKP sensor variation learn procedure was terminated, this may be caused by PCM detecting a problem in cam signal causing DTC P0341, 3X crank signal causing DTC P1374 3X or 24X crank signal causing DTC P0336 24X. Using scan tool, check for stored DTCs. Perform test procedures for specified DTCs and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
Check scan tool for status of DTC P1336. If scan tool indicates DTC P1336 ran and passed, CKP sensor variation learn procedure is complete. If scan tool indicates DTC P1336 failed or was not run, check for any other DTCs. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If any other DTCs exist, perform test procedures for specified DTC and repair as necessary. If no other DTCs exist, repeat CKP sensor variation learn procedure.

Password Learn Procedure For Anti-Theft System (Cutlass & Malibu)

Password learn procedure must be performed if Body Function Controller (BFC) is replaced. A password is communicated between BFC and Powertrain Control Module (PCM) to provide engine operation. If BFC is replaced, the PCM must learn the password from the BFC. If password learn procedure is not performed, Diagnostic Trouble Codes (DTCs) P1631 and P1632 may be set in the PCM when attempting to start the engine.
Attempt to start engine and then leave ignition on. DO NOT turn ignition off. The THEFT SYSTEM indicator light will flash for about 10 minutes and then turn off. THEFT SYSTEM indicator light is located on instrument panel, just to the left of tachometer. NOTE: If PCM is replaced, the Electronically Erasable Programmable Read Only Memory (EEPROM) should be programmed. When EEPROM is programmed, the PCM will learn the password when ignition is initially turned on. Password learn procedure is not required when replacing the PCM and EEPROM is programmed.
Once THEFT SYSTEM indicator light stops flashing, turn ignition off. Attempt to start the engine. If engine starts, the password learn procedure is complete.
On Malibu 2.4L, if password is not learned, a Diagnostic Trouble Code (DTC) P1626, P1632 and U1064 may be set in PCM. Perform test procedures for specified DTC and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
On Cutlass 3.1L and Malibu 3.1L, if password is not learned, a Diagnostic Trouble Code (DTC) P1610, P1626 and P1632 may be set in PCM. Perform test procedures for specified DTC and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.

Password Learn Procedure For Anti-Theft System (Alero 3.4L & Grand Am 3.4L)

Password learn procedure must be performed if Body Function Control (BFC) or PCM is replaced. A password is communicated between BFC and PCM to provide engine operation. PCM must learn the password from the BFC.
Attempt to start vehicle. Engine will stall. Leave ignition on until theft system light turns off (about 10 minutes). Turn ignition off. Start vehicle. Password is now in memory.
If engine does not start, ensure procedure was properly followed. If procedure was properly followed, check for any DTCs. If any DTCs exist, perform test procedures for specified DTC and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.

Vehicle Driveability Computer Relearn Procedure (A/T Models)

If vehicle battery was disconnected or Powertrain Control Module (PCM) was replaced, turn ignition off. Reconnect PCM battery feed. Turn A/C off. Set parking brake and block drive wheels. Start engine.
Idle engine until it reaches operating temperature. Shift transmission into Drive. Allow engine to idle for 5 minutes. Shift transmission selector into Park. Allow engine to idle another 5 minutes. Turn engine off for 30 seconds. Vehicle should now be returned to learned idle.

Vehicle Driveability Computer Relearn Procedure (M/T Models)

If vehicle battery was disconnected or Powertrain Control Module (PCM) was replaced, turn ignition off. Reconnect PCM battery feed. Turn A/C off. Set parking brake and block drive wheels. Shift transmission into Neutral.
Start engine. Idle engine until it reaches operating temperature. Allow engine to idle for 5 minutes. Turn engine off for 30 seconds. Vehicle should now be returned to learned idle.

AURORA & RIVIERA

Note. Read all procedures listed to determine why and when each procedure is to be performed before proceeding.

Electronically Erasable Programmable Read Only Memory (EEPROM) Programming (3.8L)

If Powertrain Control Module (PCM) was replaced, the EEPROM in the PCM must be programmed. If EEPROM is not programmed, a Diagnostic Trouble Code (DTC) will be set in the PCM.
Ensure battery is fully charged. Ensure cable is properly connected on Data Link Connector (DLC). Turn ignition on. Perform EEPROM programming using the Techline equipment manufacturer's instructions and latest software applicable for the vehicle model.
Once EEPROM is reprogrammed, the Crankshaft Position (CKP) sensor variation learn procedure must be performed using proper procedure.

Note. If EEPROM programming fails, ensure all electrical connections on PCM are okay. Check Techline for latest software. If EEPROM programming still fails, replace PCM.

Electronically Erasable Programmable Read Only Memory (EEPROM) Programming (4.0L)

If Powertrain Control Module (PCM) was replaced, the EEPROM in the PCM must be programmed. If EEPROM is not programmed, a Diagnostic Trouble Code (DTC) will be set in the PCM or PCM may be damaged. Perform EEPROM programming using the Techline equipment manufacturer's instructions and latest software applicable for the vehicle model.
Once EEPROM is programmed, use scan tool to clear DTC P0603 from PCM. Engine oil life interval and transaxle fluid life interval must now be reprogrammed using proper procedure. Turn ignition off. Wait 30 seconds to ensure all memory learn procedures occur.

Crankshaft Position (CKP) Sensor Variation Learn Procedure (3.8L)

Procedure must be performed if any of the following have been done or exist: EEPROM was reprogrammed. If Diagnostic Trouble Code (DTC) P1336 exists. If crankshaft, crankshaft position sensor, engine, Powertrain Control Module (PCM) or vibration damper have been replaced.
CKP sensor variation compensating values are stored in Powertrain Control Module (PCM) after a learn procedure has been performed. If actual CKP sensor values are not within specification, Diagnostic Trouble Code (DTC) P0300 will be stored in the PCM.
Using scan tool, check for stored DTCs. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If no DTCs exist, or if DTC P1336 exists, go to next step. If any DTCs exist except for P1336, perform test procedures for specified DTC and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. Ensure all DTCs are cleared from PCM. Go to next step.
Ensure ignition is off. Apply parking brake. Block front wheels. Ensure hood is closed. Start engine and warm engine until engine coolant temperature is at least 158°F (70°C). Turn ignition off. NOTE: Ensure engine coolant temperature is at least 158°F (70°C) before performing CKP sensor variation learn procedure.
Using scan tool, select and enable CKP sensor variation learn procedure. Start engine. Apply service brakes. Ensure transaxle is in Park.
Accelerate engine until CKP sensor variation learn procedure fuel cut off is obtained at 5150 RPM. Quickly release throttle to idle position once CKP sensor variation learn procedure fuel cut off is obtained and engine starts to decelerate. Once CKP sensor variation values are learned, the PCM will return engine control to the operator and engine will respond to throttle position. CAUTION: Ensure throttle is quickly released to idle position once CKP sensor variation learn procedure fuel cut off is obtained.
If CKP sensor variation learn procedure was not terminated, go to next step. If CKP sensor variation learn procedure was terminated, this may be caused by PCM detecting a problem in cam signal causing DTC P0341, 3X crank signal causing DTC P1374, 3X or 18X crank signal causing DTC P0336 18X. Using scan tool, check for stored DTCs. Perform test procedures for specified DTCs and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
Check scan tool for status of DTC P1336. If scan tool indicates DTC P1336 ran and passed, CKP sensor variation learn procedure is complete. If scan tool indicates DTC P1336 failed or was not run, check for any other DTCs. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If any other DTCs exist, perform test procedures for specified DTC and repair as necessary. If no other DTCs exist, repeat CKP sensor variation learn procedure.

Engine Oil Life Interval Programming (4.0L)

Engine oil life interval programming must be performed if any of the following have been done: Battery voltage was disconnected from PCM before ignition switch was placed in LOCK position for a minimum of 30 seconds. EEPROM was reprogrammed. PCM was replaced.
Engine oil life interval is calculated by the Powertrain Control Module (PCM). The PCM uses many engine parameters to determine the percentage of engine oil life remaining before engine oil should be changed.
Engine oil life interval may be read by the operator by depressing ENG button on Driver Information Center (DIC). The DIC is located above the climate controls at center of instrument panel. Engine oil life interval will be displayed as a percentage when DIC indicates OIL LIFE.
If battery voltage was disconnected from PCM before ignition switch was placed in LOCK position for a minimum of 30 seconds, or PCM was replaced, engine oil life interval must be reprogrammed or reset. Engine oil life interval may be programmed or reset by using a scan tool or the DIC.
If using scan tool to reprogram or reset engine oil life interval, use scan tool manufacturer's instructions and reprogram or reset engine oil life interval back to the closest original interval index that was recorded on original PCM. Scan tool may reset engine oil life interval index in 10 percent intervals. NOTE: Scan tool may reset engine oil life interval index in 10 percent intervals. The DIC can only reprogram or reset engine oil life interval to 100 percent.
If using DIC to reprogram or reset engine oil life interval, ensure ignition is on. Depress ENG button on DIC until displays OIL LIFE percentage. Depress and hold RESET button on DIC for 5 seconds. The word RESET will be displayed and then OIL LIFE 100 percent will be displayed. Release all buttons. The DIC can only reprogram or reset engine oil life interval to 100 percent.

Transaxle Fluid Life Interval Programming (4.0L)

Transaxle fluid life interval programming must be performed if any of the following have been done: Battery voltage was disconnected from PCM before ignition switch was placed in LOCK position for a minimum of 30 seconds. EEPROM was reprogrammed. PCM was replaced.
Transaxle fluid life interval is calculated by the Powertrain Control Module (PCM). The PCM uses many engine parameters to determine the percentage of transaxle fluid life interval remaining before fluid should be changed.
When PCM determines transaxle fluid should be changed, a signal is sent to the instrument cluster and warning light is displayed. If battery voltage was disconnected from PCM before ignition switch was placed in LOCK position for a minimum of 30 seconds, or PCM was replaced, transaxle fluid life interval must be reprogrammed or reset.
To reprogram or reset transaxle fluid life interval to original interval set in the PCM, connect scan tool to Data Link Connector (DLC). Using scan tool manufacturer's instructions and reprogram or reset transaxle fluid life interval back to the closest original interval index that was recorded on original PCM.

Vehicle Driveability Computer Relearn Procedure (All Models)

Manufacturer does not provide a specified computer relearn procedure for obtaining proper driveability. If vehicle battery was disconnected or Powertrain Control Module (PCM) was replaced, driving the vehicle will enable the PCM to perform a computer relearn procedure for obtaining proper driveability. Inform customer that driveability may differ from what they are accustomed to until the PCM completes the computer relearn procedure.

BONNEVILLE, EIGHTY EIGHT & LE SABRE

Note. Read all procedures listed to determine why and when each procedure is to be performed before proceeding.

Electronically Erasable Programmable Read Only Memory (EEPROM) Programming

If Powertrain Control Module (PCM) was replaced, the EEPROM in the PCM must be programmed. If EEPROM is not programmed, a Diagnostic Trouble Code (DTC) will be set in the PCM.
Ensure battery is fully charged. If battery is being charged, ensure battery charger is disconnected before performing EEPROM programming procedure.
Ensure cable is properly connected on Data Link Connector (DLC). Turn ignition on. Perform EEPROM programming using the Techline equipment manufacturer's instructions and latest software applicable for the vehicle model.
Once EEPROM is reprogrammed, perform powertrain On-Board Diagnostic (OBD) system check. See POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. Ensure engine is idling for one minute before checking for DTCs when performing powertrain OBD system check. Also after EEPROM is reprogrammed, the Crankshaft Position (CKP) sensor variation learn procedure must be performed using proper procedure.

Note. If EEPROM programming fails, ensure all electrical connections on PCM are okay. Check Techline for latest software. If EEPROM programming still fails, replace PCM.

Crankshaft Position (CKP) Sensor Variation Learn Procedure

Procedure must be performed if any of the following have been done or exist: EEPROM was reprogrammed. If Diagnostic Trouble Code (DTC) P1336 exists. If crankshaft, crankshaft position sensor, engine, Powertrain Control Module (PCM) or vibration damper have been replaced.
CKP sensor variation compensating values are stored in Powertrain Control Module (PCM) after a learn procedure has been performed. If actual CKP sensor values are not within specification, Diagnostic Trouble Code (DTC) P0300 will be stored in the PCM.
Using scan tool, check for stored DTCs. If no DTCs exist, or if DTC P1336 exists, go to next step. If any DTCs exist except for P1336, perform test procedures for specified DTC and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. Ensure all DTCs are cleared from PCM. Go to next step.
Ensure ignition is off. Apply parking brake. Block front wheels. Ensure hood is closed. Start engine and warm engine until engine coolant temperature is at least 158°F (70°C). Turn ignition off. NOTE: Ensure engine coolant temperature is at least 158°F (70°C) before performing CKP sensor variation learn procedure.
Using scan tool, select and enable CKP sensor variation learn procedure. Start engine. Apply service brakes. Ensure transaxle is in Park.
Accelerate engine until CKP sensor variation learn procedure fuel cut off is obtained at 5150 RPM. Quickly release throttle to idle position once CKP sensor variation learn procedure fuel cut off is obtained and engine starts to decelerate. Once CKP sensor variation values are learned, the PCM will return engine control to the operator and engine will respond to throttle position. CAUTION: Ensure throttle is quickly released to idle position once CKP sensor variation learn procedure fuel cut off is obtained.
If CKP sensor variation learn procedure was not terminated, go to next step. If CKP sensor variation learn procedure was terminated, this may be caused by PCM detecting a problem in cam signal causing DTC P0341, 3X crank signal causing DTC P1374 3X or 18X crank signal causing DTC P0336 18X. Using scan tool, check for stored DTCs. Perform test procedures for specified DTCs and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
Check scan tool for status of DTC P1336. If scan tool indicates DTC P1336 ran and passed, CKP sensor variation learn procedure is complete. If scan tool indicates DTC P1336 failed or was not run, check for any other DTCs. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If any other DTCs exist, perform test procedures for specified DTC and repair as necessary. If no other DTCs exist, repeat CKP sensor variation learn procedure.

Vehicle Driveability Computer Relearn Procedure

CAMARO & FIREBIRD

Note. Read all procedures listed to determine why and when each procedure is to be performed before proceeding.

If Powertrain Control Module (PCM) was replaced, the EEPROM in the PCM must be programmed. If EEPROM is not programmed, a Diagnostic Trouble Code (DTC) will be set in the PCM.
Ensure battery is fully charged. Ensure cable is properly connected on Data Link Connector (DLC). Turn ignition on. Perform EEPROM programming using the Techline equipment manufacturer's instructions and latest software applicable for the vehicle model.
On 3.8L, once EEPROM is reprogrammed, perform powertrain On-Board Diagnostic (OBD) system check. See POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. Ensure engine is idling for one minute before checking for DTCs when performing powertrain OBD system check. NOTE: If EEPROM programming fails, ensure all electrical connections on PCM are okay. Check Techline for latest software. If EEPROM programming still fails, replace PCM.
On 5.7L, once EEPROM is reprogrammed, perform powertrain On-Board Diagnostic (OBD) system check. See POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. Ensure engine is idling for one minute before checking for DTCs when performing powertrain OBD system check. Also, after EEPROM is reprogrammed, the idle learn procedure and then Crankshaft Position (CKP) sensor variation learn procedure must be performed using proper procedures.

Idle Learn Procedure (5.7L)

Idle learn procedure must be performed to provide proper positioning of Idle Air Control (IAC) valve to obtain proper engine idle. If idle learn procedure is not performed, engine idle may become unstable. Procedure must be performed if any of the following have been done: Vehicle battery was disconnected. PCM was disconnected or PCM looses battery voltage. On A/T models, go to next step. On M/T models, go to step 4).
On A/T models, ensure ignition is off. Restore battery voltage to PCM. Ensure A/C is turned off. Apply parking brake. Block rear wheels. Start engine. Place transmission in Drive. Allow engine to idle for 5 minutes. Place transmission in Park.
Allow engine to idle for 5 minutes. Shut engine off for 30 seconds. Clear Diagnostic Trouble Codes (DTCs) from PCM. Perform powertrain On-Board Diagnostic (OBD) system check. See POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. Ensure engine is idling for one minute before checking for DTCs when performing powertrain OBD system check.
On M/T models, ensure ignition is off. Restore battery voltage to PCM. Ensure A/C is turned off. Apply parking brake. Block rear wheels. Place transmission in Neutral. Start engine. Allow engine to idle for 5 minutes.
Shut engine off for 30 seconds. Clear Diagnostic Trouble Codes (DTCs) from PCM. Perform powertrain On-Board Diagnostic (OBD) system check. See POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. Ensure engine is idling for one minute before checking for DTCs when performing powertrain OBD system check.

Procedure must be performed if any of the following have been done or exist: EEPROM was reprogrammed. If Diagnostic Trouble Code (DTC) P1336 exists. If crankshaft, crankshaft position sensor, engine, Powertrain Control Module (PCM) or vibration damper have been replaced.
CKP sensor variation compensating values are stored in Powertrain Control Module (PCM) after a learn procedure has been performed. If actual CKP sensor values are not within specification, Diagnostic Trouble Code (DTC) P0300 will be stored in the PCM.
Using scan tool, check for stored DTCs. If no DTCs exist, or if DTC P1336 exists, go to next step. If any DTCs exist except for P1336, perform test procedures for specified DTC and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. Ensure all DTCs are cleared from PCM. Go to next step.
Ensure ignition is off. Apply parking brake. Block rear wheels. Ensure hood is closed. Start engine and warm engine until engine coolant temperature is at least 158°F (70°C). Turn ignition off. NOTE: Ensure engine coolant temperature is at least 158°F (70°C) before performing CKP sensor variation learn procedure.
Using scan tool, select and enable CKP sensor variation learn procedure. Start engine. DO NOT start engine until instructed to do so by scan tool. Apply service brakes. Ensure transmission is in Park.
Accelerate engine until CKP sensor variation learn procedure fuel cut off is obtained at 5150 RPM. Quickly release throttle to idle position once CKP sensor variation learn procedure fuel cut off is obtained and engine starts to decelerate. Once CKP sensor variation values are learned, the PCM will return engine control to the operator and engine will respond to throttle position. CAUTION: Ensure throttle is quickly released to idle position once CKP sensor variation learn procedure fuel cut off is obtained.
If CKP sensor variation learn procedure was not terminated, go to next step. If CKP sensor variation learn procedure was terminated, this may be caused by PCM detecting a problem in cam signal causing DTC P0341, 3X crank signal causing DTC P1374 3X or 18X crank signal causing DTC P0336 18X. Using scan tool, check for stored DTCs. Perform test procedures for specified DTCs and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
Check scan tool for status of DTC P1336. If scan tool indicates DTC P1336 ran and passed, CKP sensor variation learn procedure is complete. If scan tool indicates DTC P1336 failed or was not run, check for any other DTCs. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If any other DTCs exist, perform test procedures for specified DTC and repair as necessary. If no other DTCs exist, repeat CKP sensor variation learn procedure.

Crankshaft Position (CKP) Sensor Variation Learn Procedure (5.7L)

Procedure must be performed if any of the following have been done: EEPROM was reprogrammed. If crankshaft position sensor was removed or replaced. Powertrain Control Module (PCM) has been replaced.
Install scan tool on Data Link Connector (DLC). Apply parking brake. Block rear wheels. Ensure hood is closed. Ensure transmission is in Park (A/T models) or Neutral (M/T models). Start engine and allow engine to idle until engine coolant temperature is at least 150°F (65°C). Ensure all accessories are off.
Apply brakes. Ensure brakes remain applied during remaining duration of this procedure. Using scan tool, select and enable CKP sensor variation learn procedure.
Gradually accelerate engine to 4000 RPM. Quickly release throttle to idle position once CKP sensor variation learn procedure is obtained and engine starts to decelerate. Once CKP sensor variation values are learned, the PCM will return engine control to the operator and engine will respond to throttle position.
If CKP sensor variation learn procedure was not terminated, turn ignition off for at least 15 seconds. CKP sensor variation learn procedure is complete. If CKP sensor variation learn procedure was terminated, turn ignition off. Refer to Diagnostic Trouble Code (DTC) P1336 for additional diagnostic information. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.

CATERA

Note. Read all procedures listed to determine why and when each procedure is to be performed before proceeding.

The replacement Powertrain Control Module (PCM) comes with the EEPROM already programmed. However, the PCM must be programmed, with proper immobilizer signal for anti-theft system before the vehicle will start. See appropriate ANTI-THEFT SYSTEMS article in ACCESSORIES & EQUIPMENT for programming immobilizer signal.
Once PCM is programmed, perform powertrain On-Board Diagnostic (OBD) system check. See POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.

Sun Roof Actuator Programming

Procedure must be performed when vehicle battery is disconnected. Turn ignition on.
Rotate knob on sun roof control switch to CLOSED position. Sun roof control switch is located on the overhead console near the windshield. After sun roof is fully closed, press and hold knob on sun roof control switch inward for 3 seconds.
Rotate knob on sun roof control switch to the VENT position. After sun roof moves to the vent position, press and hold knob on sun roof control switch inward for 3 seconds.
Rotate knob on sun roof control switch to the OPEN position. After sun roof full opens, press and hold knob on sun roof control switch inward for 3 seconds.
Rotate knob on sun roof control switch to CLOSED position. After sun roof is fully closed, press and hold knob on sun roof control switch inward for 3 seconds.
Sun roof actuator is now programmed. If after programming the sun roof actuator, the sun roof opens after being closed, it may be necessary to reprogram actuator up to 3 more times.

CAVALIER & SUNFIRE

Note. Read all procedures listed to determine why and when each procedure is to be performed before proceeding.

If Powertrain Control Module (PCM) was replaced, the EEPROM in the PCM must be programmed. If EEPROM is not programmed, a Diagnostic Trouble Code (DTC) will be set in the PCM or PCM may be damaged. Perform EEPROM programming using the Techline equipment manufacturer's instructions and latest software applicable for the vehicle model.
Once EEPROM is reprogrammed, the Crankshaft Position (CKP) sensor variation learn procedure must be performed using proper procedure.

Procedure must be performed if any of the following have been done or exist: EEPROM was reprogrammed. If Diagnostic Trouble Code (DTC) P1336 exists. If crankshaft, crankshaft position sensor, engine or Powertrain Control Module (PCM) have been replaced. Any repairs have been performed that disturbs the crankshaft or vibration damper to the crankshaft position sensor relationship.
CKP sensor variation compensating values are stored in Powertrain Control Module (PCM) after a learn procedure has been performed. If actual CKP sensor values are not within specification, Diagnostic Trouble Code (DTC) P0300 will be stored in the PCM.
Ensure battery is fully charged. Ensure cable is properly connected on Data Link Connector (DLC). Apply parking brake. Block front wheels. Ensure hood is closed.
Place transaxle in Park (A/T models) or Neutral (M/T models). Ensure all accessories are off. Start engine and warm engine until engine coolant temperature is at least 185°F (85°C).
Apply service brakes. With engine idling, use scan tool to select and enable CKP sensor variation learn procedure.
Accelerate engine until CKP sensor variation learn procedure fuel cut off is obtained and engine starts to decelerate or cut out. Quickly release throttle to idle position once CKP sensor variation learn procedure is obtained and engine decelerates or cuts out. Once CKP sensor variation values are learned, the PCM will return engine control to the operator and engine will respond to throttle position. CAUTION: Ensure throttle is quickly released to idle position once CKP sensor variation learn procedure fuel cut off is obtained and engine starts to decelerate or cut out.
Using scan tool, verify that CKP sensor variation learn procedure was completed. If CKP sensor variation learn procedure was not completed, go to next step. If CKP sensor variation learn procedure was completed, shut engine off and remove scan tool.
If CKP sensor variation learn procedure was not completed, repeat entire procedure up to 10 times. If PCM will not learn the CKP sensor variation compensating values, a DTC P1336 should be stored in the PCM. Perform test procedures for DTC P1336 and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.

Password Learn Procedure For Anti-Theft System

Password learn procedure must be performed if Instrument Panel Cluster (IPC) is replaced. A password is communicated between IPC and Powertrain Control Module (PCM) to provide engine operation. If IPC is replaced, the PCM must learn the password from the IPC.
Attempt to start engine and then leave ignition on. DO NOT turn ignition off. The THEFT SYSTEM indicator light will flash for 10 minutes. NOTE: If PCM is replaced, the Electronically Erasable Programmable Read Only Memory (EEPROM) should be programmed. When EEPROM is programmed, the PCM will learn the password when ignition is initially turned on. Password learn procedure is not required when replacing the PCM and EEPROM is programmed.
On Cavalier, THEFT SYSTEM indicator light is located on IPC, just above the vehicle mileage indicator. On Sunfire, THEFT SYSTEM indicator light is located on IPC, just above the temperature gauge.
On all models, once THEFT SYSTEM indicator light stops flashing, attempt to start the engine. If engine starts, the password learn procedure is complete. If engine does not start, ensure procedure was properly followed. If procedure was properly followed, check for any DTCs. If any DTCs exist, perform test procedures for specified DTC and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.

CENTURY, GRAND PRIX, INTRIGUE, LUMINA, MONTE CARLO & REGAL

Note. Read all procedures listed to determine why and when each procedure is to be performed before proceeding.

Electronically Erasable Programmable Read Only Memory (EEPROM) Programming (All Models)

If Powertrain Control Module (PCM) was replaced, the EEPROM in the PCM must be programmed. If EEPROM is not programmed, a Diagnostic Trouble Code (DTC) will be set in the PCM.
Ensure battery is fully charged. If battery is being charged, ensure battery charger is disconnected before performing EEPROM programming procedure.
Ensure cable is properly connected on Data Link Connector (DLC). Turn ignition on. Perform EEPROM programming using the Techline equipment manufacturer's instructions and latest software applicable for the vehicle model.
Once EEPROM is reprogrammed, perform powertrain On-Board Diagnostic (OBD) system check. See POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. Ensure engine is idling for one minute before checking for DTCs when performing powertrain OBD system check. On 3.5L and 3.8L, after EEPROM is reprogrammed, the Crankshaft Position (CKP) sensor variation learn procedure must be performed using proper procedure.

Note. If EEPROM programming fails, ensure all electrical connections on PCM are okay. Check Techline for latest software. If EEPROM programming still fails, replace PCM.

Crankshaft Position (CKP) Sensor Variation Learn Procedure (3.1L)

Procedure must be performed if any of the following have been done or exist: EEPROM was reprogrammed. If Diagnostic Trouble Code (DTC) P1336 exists. If crankshaft, crankshaft position sensor, engine, Powertrain Control Module (PCM) or vibration damper have been replaced.
CKP sensor variation compensating values are stored in Powertrain Control Module (PCM) after a learn procedure has been performed. If actual CKP sensor values are not within specification, Diagnostic Trouble Code (DTC) P0300 will be stored in the PCM.
Using scan tool, check for stored DTCs. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If no DTCs exist, or if DTC P1336 exists, go to next step. If any DTCs exist except for P1336, perform test procedures for specified DTC and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. Ensure all DTCs are cleared from PCM. Go to next step.
Ensure ignition is off. Apply parking brake. Block front wheels. Ensure hood is closed. Start engine and warm engine until engine coolant temperature is at least 158°F (70°C). Turn ignition off. NOTE: Ensure engine coolant temperature is at least 158°F (70°C) before performing CKP sensor variation learn procedure.
Using scan tool, select and enable CKP sensor variation learn procedure. Start engine. Apply service brakes. Ensure transaxle is in Park.
Accelerate engine until CKP sensor variation learn procedure fuel cut off is obtained at 5150 RPM. Quickly release throttle to idle position once CKP sensor variation learn procedure fuel cut off is obtained and engine starts to decelerate. Once CKP sensor variation values are learned, the PCM will return engine control to the operator and engine will respond to throttle position. CAUTION: Ensure throttle is quickly released to idle position once CKP sensor variation learn procedure fuel cut off is obtained.
If CKP sensor variation learn procedure was not terminated, go to next step. If CKP sensor variation learn procedure was terminated, this may be caused by PCM detecting a problem in cam signal causing DTC P0341, 3X crank signal causing DTC P1374 3X or 24X crank signal causing DTC P0336 24X. Using scan tool, check for stored DTCs. Perform test procedures for specified DTCs and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
Check scan tool for status of DTC P1336. If scan tool indicates DTC P1336 ran and passed, CKP sensor variation learn procedure is complete. If scan tool indicates DTC P1336 failed or was not run, check for any other DTCs. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If any other DTCs exist, perform test procedures for specified DTC and repair as necessary. If no other DTCs exist, repeat CKP sensor variation learn procedure.

Crankshaft Position (CKP) Sensor Variation Learn Procedure (3.5L & 3.8L)

Procedure must be performed if any of the following have been done or exist: EEPROM was reprogrammed. If Diagnostic Trouble Code (DTC) P1336 exists. If crankshaft, crankshaft position sensor, engine, Powertrain Control Module (PCM) or vibration damper have been replaced.
CKP sensor variation compensating values are stored in Powertrain Control Module (PCM) after a learn procedure has been performed. If actual CKP sensor values are not within specification, Diagnostic Trouble Code (DTC) P0300 will be stored in the PCM.
Using scan tool, check for stored DTCs. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If no DTCs exist, or if DTC P1336 exists, go to next step. If any DTCs exist except for P1336, perform test procedures for specified DTC and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. Ensure all DTCs are cleared from PCM. Go to next step.
Ensure ignition is off. Apply parking brake. Block front wheels. Ensure hood is closed. Start engine and warm engine until engine coolant temperature is at least 158°F (70°C). Turn ignition off. NOTE: Ensure engine coolant temperature is at least 158°F (70°C) before performing CKP sensor variation learn procedure.
Using scan tool, select and enable CKP sensor variation learn procedure. Start engine. Apply service brakes. Ensure transaxle is in Park.
Accelerate engine until CKP sensor variation learn procedure fuel cut off is obtained at 4300 RPM (3.5L) or 5150 RPM (3.8L). Quickly release throttle to idle position once CKP sensor variation learn procedure fuel cut off is obtained and engine starts to decelerate. Once CKP sensor variation values are learned, the PCM will return engine control to the operator and engine will respond to throttle position. CAUTION: Ensure throttle is quickly released to idle position once CKP sensor variation learn procedure fuel cut off is obtained.
If CKP sensor variation learn procedure was not terminated, go to next step. If CKP sensor variation learn procedure was terminated, this may be caused by PCM detecting a problem in cam signal causing DTC P0341, 3X crank signal causing DTC P1374 3X or 18X crank signal causing DTC P0336 18X. Using scan tool, check for stored DTCs. Perform test procedures for specified DTCs and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
Check scan tool for status of DTC P1336. If scan tool indicates DTC P1336 ran and passed, CKP sensor variation learn procedure is complete. If scan tool indicates DTC P1336 failed or was not run, check for any other DTCs. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If any other DTCs exist, perform test procedures for specified DTC and repair as necessary. If no other DTCs exist, repeat CKP sensor variation learn procedure.

CORVETTE

Note. Read all procedures listed to determine why and when each procedure is to be performed before proceeding.

If Powertrain Control Module (PCM) was replaced, the EEPROM in the PCM must be programmed. If EEPROM is not programmed, a Diagnostic Trouble Code (DTC) will be set in the PCM.
Ensure battery is fully charged. Ensure cable is properly connected on Data Link Connector (DLC). Turn ignition on. Perform EEPROM programming using the Techline equipment manufacturer's instructions and latest software applicable for the vehicle model.
Once EEPROM is reprogrammed, perform powertrain On-Board Diagnostic (OBD) system check. See POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. Ensure engine is idling for one minute before checking for DTCs when performing powertrain OBD system check. Also after EEPROM is reprogrammed, the password learn procedure for the anti-theft system must be performed.

Note. If EEPROM programming fails, ensure all electrical connections on PCM are okay. Check Techline for latest software. If EEPROM programming still fails, replace PCM.

Password learn procedure must be performed if Powertrain Control Module (PCM) is replaced. A password is communicated between Body Control Module (BCM) and PCM to provide engine operation. If PCM is replaced, the PCM must learn the password from the BCM. If password learn procedure is not performed a Diagnostic Trouble Code (DTC) may be set in the PCM when attempting to start engine.
Using Tech 2 scan tool, select NEW BCM setup and program BCM with correct RPO code configuration. Turn ignition switch to ON position with engine off for 11 minutes. Turn ignition switch to OFF position for 30 seconds. NOTE: Ensure battery is fully charged before proceeding. Performing this procedure will cause a DTC P1630 to be set in the PCM. It will be necessary to use scan tool to check for DTC P1630 when performing this procedure.
Turn ignition switch to ON position with engine off for 11 minutes. Turn ignition switch to OFF position for 30 seconds.
Turn ignition switch to ON position with engine off for 11 minutes or until DTC P1630 is set. Turn ignition switch to OFF position for 30 seconds.
Turn ignition switch to ON position with engine off for 30 seconds. Attempt to start engine.
If engine starts, go to next step. If engine does not start, check for any other DTCs. If any DTCs exist, perform test procedures for specified DTC and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
Clear DTCs from PCM. Turn ignition switch to OFF position for 30 seconds. Attempt to start engine.
If engine does not start, ensure procedure was properly followed. If procedure was properly followed, check for any DTCs. If any DTCs exist, perform test procedures for specified DTC and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.

DEVILLE, ELDORADO & SEVILLE

Note. Read all procedures listed to determine why and when each procedure is to be performed before proceeding.

If Powertrain Control Module (PCM) was replaced, the EEPROM in the PCM must be programmed. If EEPROM is not programmed, a Diagnostic Trouble Code (DTC) will be set in the PCM or PCM may be damaged. Perform EEPROM programming using the Techline equipment manufacturer's instructions and latest software applicable for the vehicle model.
To verify proper EEPROM programming, start engine. If engine starts, go to next step. If engine fails to start, ensure all electrical connections on PCM are okay and all fuses are okay. Check Techline for latest software. Once engine is repaired so it will start, go to next step.
Once EEPROM is programmed, use scan tool to clear DTC P0603 from PCM. Engine oil life interval and transaxle fluid life interval must now be reprogrammed using proper procedure.

Engine Oil Life Interval Programming

Engine oil life interval programming must be performed if any of the following have been done: Battery voltage was disconnected from PCM before ignition switch was placed in LOCK position for a minimum of 30 seconds. EEPROM was reprogrammed. PCM was replaced.
Engine oil life interval is calculated by the Powertrain Control Module (PCM). The PCM uses many engine parameters to determine the percentage of engine oil life remaining before engine oil should be changed.
Engine oil life interval may be read by the operator by depressing INFO button on Driver Information Center (DIC). The DIC is located above the stereo. Engine oil life interval will be displayed as a percentage when DIC indicates OIL LIFE LEFT.
If battery voltage was disconnected from PCM before ignition switch was placed in LOCK position for a minimum of 30 seconds, or PCM was replaced, engine oil life interval must be reprogrammed or reset. Engine oil life interval may be programmed or reset by using a scan tool or the DIC.
If using scan tool to reprogram or reset engine oil life interval, use scan tool manufacturer's instructions and reprogram or reset engine oil life interval back to the closest original interval index that was recorded on original PCM. Scan tool may reset engine oil life interval index in 10 percent intervals. NOTE: Scan tool may reset engine oil life interval index in 10 percent intervals. The DIC can only reprogram or reset engine oil life interval to 100 percent.
If using DIC to reprogram or reset engine oil life interval, depress INFO button on DIC. Depress and hold INFO RESET button on DIC until 100 percent OIL LIFE LEFT is displayed on instrument panel. Release all buttons. The DIC can only reprogram or reset engine oil life interval to 100 percent.

Transaxle Fluid Life Interval Programming

Transaxle fluid life interval programming must be performed if any of the following have been done: Battery voltage was disconnected from PCM before ignition switch was placed in LOCK position for a minimum of 30 seconds. EEPROM was reprogrammed. PCM was replaced.
Transaxle fluid life interval is calculated by the Powertrain Control Module (PCM). The PCM uses many engine parameters to determine the percentage of transaxle fluid life interval remaining before fluid should be changed.
When PCM determines transaxle fluid should be changed, a signal is sent to the instrument cluster and warning light is displayed. If battery voltage was disconnected from PCM before ignition switch was placed in LOCK position for a minimum of 30 seconds, or PCM was replaced, transaxle fluid life interval must be reprogrammed or reset.
To reprogram or reset transaxle fluid life interval to original interval set in the PCM, connect scan tool to Data Link Connector (DLC). Using scan tool manufacturer's instructions and reprogram or reset transaxle fluid life interval back to the closest original interval index that was recorded on original PCM.

METRO & FIREFLY (CANADIAN)

Note. Powertrain Control Module (PCM) does not have a reprogrammable EEPROM. No special procedures are required for programming the PCM.

PARK AVENUE

Note. Read all procedures listed to determine why and when each procedure is to be performed before proceeding.

If Powertrain Control Module (PCM) was replaced, the EEPROM in the PCM must be programmed. If EEPROM is not programmed, a Diagnostic Trouble Code (DTC) will be set in the PCM.
Ensure battery is fully charged. If battery is being charged, ensure battery charger is disconnected before performing EEPROM programming procedure.
Ensure cable is properly connected on Data Link Connector (DLC). Turn ignition on. Perform EEPROM programming using the Techline equipment manufacturer's instructions and latest software applicable for the vehicle model. NOTE: If EEPROM programming fails, ensure all electrical connections on PCM are okay. Check Techline for latest software. If EEPROM programming still fails, replace PCM.
Once EEPROM is reprogrammed, perform powertrain On-Board Diagnostic (OBD) system check. See POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. Ensure engine is idling for one minute before checking for DTCs when performing powertrain OBD system check. Also after EEPROM is reprogrammed, the Crankshaft Position (CKP) sensor variation learn procedure must be performed using proper procedure.

Procedure must be performed if any of the following have been done or exist: EEPROM was reprogrammed. If Diagnostic Trouble Code (DTC) P1336 exists. If crankshaft, crankshaft position sensor, engine, Powertrain Control Module (PCM) or vibration damper have been replaced.
CKP sensor variation compensating values are stored in Powertrain Control Module (PCM) after a learn procedure has been performed. If actual CKP sensor values are not within specification, Diagnostic Trouble Code (DTC) P0300 will be stored in the PCM.
Using scan tool, check for stored DTCs. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If no DTCs exist, or if DTC P1336 exists, go to next step. If any DTCs exist except for P1336, perform test procedures for specified DTC and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. Ensure all DTCs are cleared from PCM. Go to next step. NOTE: Ensure engine coolant temperature is at least 158°F (70°C) before performing CKP sensor variation learn procedure.
Ensure ignition is off. Apply parking brake. Block front wheels. Ensure hood is closed. Start engine and warm engine until engine coolant temperature is at least 158°F (70°C). Turn ignition off.
Using scan tool, select and enable CKP sensor variation learn procedure. Start engine. Apply service brakes. Ensure transaxle is in Park.
Accelerate engine until CKP sensor variation learn procedure fuel cut off is obtained at 5150 RPM. Quickly release throttle to idle position once CKP sensor variation learn procedure fuel cut off is obtained and engine starts to decelerate. Once CKP sensor variation values are learned, the PCM will return engine control to the operator and engine will respond to throttle position. CAUTION: Ensure throttle is quickly released to idle position once CKP sensor variation learn procedure fuel cut off is obtained.
If CKP sensor variation learn procedure was not terminated, go to next step. If CKP sensor variation learn procedure was terminated, this may be caused by PCM detecting a problem in cam signal causing DTC P0341, 3X crank signal causing DTC P1374 3X or 18X crank signal causing DTC P0336 18X. Using scan tool, check for stored DTCs. Perform test procedures for specified DTCs and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
Check scan tool for status of DTC P1336. If scan tool indicates DTC P1336 ran and passed, CKP sensor variation learn procedure is complete. If scan tool indicates DTC P1336 failed or was not run, check for any other DTCs. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If any other DTCs exist, perform test procedures for specified DTC and repair as necessary. If no other DTCs exist, repeat CKP sensor variation learn procedure.

Password learn procedure must be performed if Powertrain Control Module (PCM), Pass-Key(R) III module, ignition lock cylinder, steering column assembly or ignition key are replaced. A password is communicated between Pass-Key(R) III module and PCM to provide engine operation. If PCM is replaced, the PCM must learn the password from the Pass-Key(R) III module.
Insert a valid mechanical coded unlearned ignition key in the ignition switch. Place ignition switch in the RUN position. The SECURITY indicator light will come on for 10 minutes for the length of the auto learn timer. SECURITY indicator light is located on instrument panel, just below the fuel gauge.
When auto learn timer expires and SECURITY indicator light goes off, place ignition switch in OFF position. Remove ignition key from ignition. Wait 10 seconds.
Repeat steps 2) and 3) two more times, for a total of 30 minutes. Insert the newly learned ignition key in ignition switch.
Place ignition switch in RUN position. The SECURITY indicator light should remain off to indicate the ignition key was learned. If security indicator does not remain off, repeat procedure.

PRIZM

Note. Powertrain Control Module (PCM) does not have an reprogrammable EEPROM. No special procedures are required for programming the PCM.

SATURN

Note. Read all procedures listed to determine why and when each procedure is to be performed before proceeding.

EEPROM must also be programmed if replacing Powertrain Control Module (PCM) or changing Transaxle Control (TC) calibrations. If EEPROM is not programmed, a Diagnostic Trouble Code (DTC) will be set in the PCM.
Ensure battery is fully charged. Ensure cable is properly connected on Data Link Connector (DLC). Perform EEPROM programming using the SSS equipment manufacturer's instructions and latest software applicable for the vehicle model. CAUTION: PCM may be damaged if programming procedure is interrupted during the downloading procedure. Ensure cable for scan tool is securely connected to Service Stall System (SSS) equipment and power supply for SSS is securely connected to power supply before proceeding. NOTE: Ensure original PCM has the correct Vehicle Identification Number (VIN), vehicle tire size and vehicle options prior to programming the EEPROM. If original PCM is not available or incapable of communicating, the VIN, vehicle tire size and vehicle options must be manually entered into the replacement PCM. NOTE: On A/T models, when replacing PCM for an engine related problem, the transaxle adaptives should be transferred from original PCM to replacement PCM. Transaxle adaptives should be reset if replacing PCM for transaxle related failure, transaxle, transaxle line pressure actuator, transaxle valve body or transaxle is overhauled. Transaxle adaptives may be reset using Service Stall System (SSS) equipment or a scan tool.
Once EEPROM is reprogrammed, check for any Diagnostic Trouble Codes (DTCs). See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. Also, after EEPROM is reprogrammed, crankshaft learn procedure and vehicle driveability computer relearn procedure must be performed.

Note. Once EEPROM is reprogrammed, the SERVICE indicator light on instrument panel will flash. This is a normal function, as the PCM must learn the crankshaft notches for engine misfire diagnosis. SERVICE indicator light is located on instrument panel, just to the left of the speedometer.

Crankshaft Learn Procedure

The PCM uses crankshaft velocity calculations to determine engine misfire and to operate engine misfire self-diagnostics. PCM must know precisely the variation between notches on the crankshaft. PCM contains crankshaft learn procedure which learns the variation between notches on crankshaft. The crankshaft learn procedure must be reset if PCM, crankshaft, or crankshaft position sensor are replaced.
If crankshaft learn procedure is being performed as a result of replacing the crankshaft, reset crankshaft learn procedure using Service Stall System (SSS) equipment and manufacturer's instructions. If replacing PCM with a replacement PCM, procedure will be prompted automatically. Allow engine to idle until SERVICE light flashes. Hold engine speed between 3000-4000 RPM until light goes off after about 10-20 seconds.

Note. If any Diagnostic Trouble Codes (DTCs) exist that relate to an engine misfire, crankshaft learn procedure will not be initiated. Any DTCs for engine misfire must be corrected before performing crankshaft learn procedure.

If vehicle battery was disconnected or Powertrain Control Module (PCM) was replaced, driving the vehicle will enable the PCM to perform a computer relearn procedure for obtaining proper driveability and engine idle. Until PCM has completed computer relearn procedure, driveability or idle may differ from standard vehicle operation. On A/T models, transaxle shift qualities must be relearned.
On all models, start engine and warm engine to normal operating temperature. Perform 10 sets of upshifts (1-2, 2-3 and 3-4) at about 30 percent throttle.
On DOHC engine, while coasting at 35 MPH, slowly accelerate to 1/2 throttle to achieve a 4-3 downshift. Place gearshift in "D3" while coasting at 20 MPH, slowly accelerate at 3/4 throttle to achieve a 3-2 downshift.
Repeat step 3) 5 times. Vehicle driveability computer relearn procedure is now complete.
On SOHC engine, while coasting at 40 MPH, slowly accelerate to 1/2 throttle to achieve a 4-3 downshift. Place gearshift in "D3" while coasting at 30 MPH, slowly accelerate at 1/2 throttle to achieve a 3-2 downshift.
Repeat step 5) 5 times. Vehicle driveability computer relearn procedure is now complete.

Note. Before performing Electronically Erasable Programmable Read Only Memory (EEPROM) Programming procedure, check for any applicable Technical Service Bulletins (TSBs) that may apply to vehicle application. Body Control Module (BCM) must be programmed with proper Regular Production Option (RPO) configurations. Follow instructions on Techline Terminal and scan tool to program BCM.

ASTRO & SAFARI

Note. Read all procedures listed to determine why and when each procedure is to be performed before proceeding.

If Vehicle Control Module (VCM) was replaced, the EEPROM in the VCM must be programmed. If EEPROM is not programmed, a Diagnostic Trouble Code (DTC) will be set in the VCM.
Ensure battery is fully charged. Ensure cable is properly connected on Data Link Connector (DLC). Turn ignition on. Perform EEPROM programming using the Techline equipment manufacturer's instructions and latest software applicable for the vehicle model.
Once EEPROM is reprogrammed, Crankshaft Position (CKP) sensor variation learn procedure and password learn procedure for anti-theft system must be performed using proper procedure. NOTE: If EEPROM programming fails, ensure all electrical connections on VCM are okay. Check Techline for latest software. If EEPROM programming still fails, replace VCM.
Once Crankshaft Position (CKP) sensor variation learn procedure and password learn procedure for anti-theft system are performed, perform powertrain On-Board Diagnostic (OBD) system check. See POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.

Procedure must be performed if any of the following have been done: EEPROM was reprogrammed. If crankshaft position sensor was removed or replaced. Vehicle Control Module (VCM) was replaced.
Install scan tool on Data Link Connector (DLC). Apply parking brake. Block rear wheels. Ensure hood is closed.
Place transmission in Park (A/T models) or Neutral (M/T models). Start engine and warm engine until engine coolant temperature is at least 150°F (65°C). Ensure all accessories are off.
Apply service brakes. With engine idling, use scan tool to select and enable CKP sensor variation learn procedure.
Gradually accelerate engine to 4000 RPM. Quickly release throttle to idle position once CKP sensor variation learn procedure is obtained and engine starts to decelerate. Once CKP sensor variation values are learned, the VCM will return engine control to the operator and engine will respond to throttle position. CAUTION: Ensure throttle is quickly released to idle position once CKP sensor variation learn procedure fuel cut off is obtained and engine starts to decelerate.
If CKP sensor variation learn procedure was completed, turn ignition off for at least 15 seconds and remove scan tool. If CKP sensor variation learn procedure was not completed, a DTC P1336 should be stored in the VCM. Perform test procedures for DTC P1336 and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.

Password learn procedure must be performed if Vehicle Control Module (VCM), passlock module or passlock sensor is replaced. A password is communicated between VCM and passlock module to provide engine operation. If VCM is replaced, the VCM must learn the password from the passlock module.
Momentarily rotate ignition switch to CRANK position, but do not start engine. Release switch to RUN position, but do not turn off. Wait 10 minutes and observe SECURITY indicator. NOTE: Ensure battery is fully charged before proceeding. Ensure steps are followed in correct order or procedure may need to be repeated.
If passlock sensor was replaced, SECURITY indicator will flash for 10 minutes. If passlock module was replaced, SECURITY indicator will flash for a few seconds, then remain on for 10 minutes. If VCM was replaced with a new programmed VCM and connected to vehicle for the first time, vehicle will start and this procedure is not necessary. If replacement VCM was connected to any vehicle at any other time, SECURITY indicator will flash for a few seconds, then remain on for 10 minutes.
Of ignition remains on, SECURITY indicator will transition from flashing on briefly to off after 10 minutes. Turn ignition off and wait 10 seconds.
Repeat programming procedure 2 more times. New security code is ready to be communicated. New password is learned on next ignition switch lock cylinder from OFF to CRANK to ON.

Manufacturer does not provide a specified computer relearn procedure for obtaining proper driveability. If vehicle battery was disconnected or Vehicle Control Module (VCM) was replaced, driving the vehicle will enable the VCM to perform a computer relearn procedure for obtaining proper driveability. Inform customer that driveability may differ from what they are accustomed to until the VCM completes the computer relearn procedure.

BLAZER, BRAVADA, ENVOY, JIMMY, PICKUP & SONOMA

Note. Read all procedures listed to determine why and when each procedure is to be performed before proceeding.

Electronically Erasable Programmable Read Only Memory (EEPROM) Programming (2.2L)

If Powertrain Control Module (PCM) was replaced, the EPROM in the PCM must be programmed. If EEPROM is not programmed, a Diagnostic Trouble Code (DTC) will be set in the PCM. Perform EEPROM programming using the Techline equipment manufacturer's instructions and latest software applicable for the vehicle model.
Once EEPROM is reprogrammed, the Crankshaft Position (CKP) sensor variation learn procedure must be performed using proper procedure.

Electronically Erasable Programmable Read Only Memory (EEPROM) Programming (4.3L)

If Vehicle Control Module (VCM) was replaced, the EEPROM in the VCM must be programmed. If EEPROM is not programmed, a Diagnostic Trouble Code (DTC) will be set in the VCM.
Ensure battery is fully charged. Ensure cable is properly connected on Data Link Connector (DLC). Turn ignition on. Perform EEPROM programming using the Techline equipment manufacturer's instructions and latest software applicable for the vehicle model.
Once EEPROM has been reprogrammed, Crankshaft Position (CKP) sensor variation learn procedure and password learn procedure must be performed using proper procedure. Once Crankshaft Position (CKP) sensor variation learn procedure and password learn procedure are performed, perform powertrain On-Board Diagnostic (OBD) system check. See POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.

Note. If EEPROM programming fails, ensure all electrical connections on VCM are okay. Check Techline for latest software. If EEPROM programming still fails, replace VCM.

Crankshaft Position (CKP) Sensor Variation Learn Procedure (2.2L & 4.3L)

Procedure must be performed if any of the following have been done: EEPROM was reprogrammed. If crankshaft position sensor was removed or replaced. Vehicle Control Module (VCM) was replaced.
Install scan tool on Data Link Connector (DLC). Apply parking brake. Block rear wheels. Ensure hood is closed.
Place transmission in Park (A/T models) or Neutral (M/T models). Start engine and warm engine until engine coolant temperature is at least 150°F (65°C). Ensure all accessories are off.
Apply service brakes. With engine idling, use scan tool to select and enable CKP sensor variation learn procedure.
Gradually accelerate engine to 4000 RPM. Quickly release throttle to idle position once CKP sensor variation learn procedure is obtained and engine starts to decelerate. Once CKP sensor variation values are learned, the VCM will return engine control to the operator and engine will respond to throttle position. CAUTION: Ensure throttle is quickly released to idle position once CKP sensor variation learn procedure fuel cut off is obtained and engine starts to decelerate.
If CKP sensor variation learn procedure was completed, turn ignition off for at least 15 seconds and remove scan tool. If CKP sensor variation learn procedure was not completed, a DTC P1336 should be stored in the VCM. Perform test procedures for DTC P1336 and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.

Password Learn Procedure For Anti-Theft System (2.2L)

Password learn procedure must be performed if Truck Body Controller (TBC) or passlock sensor is replaced. A password is communicated between TBC and Powertrain Control Module (PCM) to provide engine operation. If TBC has been replaced, the PCM must learn the password from the TBC. If password learn procedure is not performed, a Diagnostic Trouble Code (DTC) may be set in the PCM when attempting to start the engine.
Attempt to start engine and then leave ignition on. DO NOT turn ignition off. The SECURITY indicator light will flash for 4 seconds and then remain on steady for about 10 minutes and then turn off. SECURITY indicator light is located on center of instrument panel, just above the turn signal indicators. Once SECURITY indicator light turns off, turn ignition off. NOTE: If PCM has been replaced, the Electronically Erasable Programmable Read Only Memory (EEPROM) should be programmed. When EEPROM has been programmed, the PCM will learn the password when ignition is initially turned on. Password learn procedure is not required when replacing the PCM and EEPROM is programmed.
Repeat step 2) two more times. When SECURITY indicator light turns off on the third ignition cycle, attempt to start the engine. If engine starts, the password learn procedure is complete. If password is not learned, a Diagnostic Trouble Code (DTC) may be set in PCM. Perform test procedures for specified DTC and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.

Password Learn Procedure For Anti-Theft System (4.3L)

Password learn procedure must be performed if Vehicle Control Module (VCM), Truck Body Controller (TBC) or passlock sensor has been replaced. A password is communicated between TBC and VCM to provide engine operation. If VCM has been replaced, the VCM must learn the password from the TBC.
Attempt to start engine. Engine will start and then stall. After engine stalls, leave ignition on for 10 minutes. After engine stalls the SECURITY indicator light will come on for 10 minutes and then go off. The SECURITY indicator light is located on center of instrument panel, just above the turn signal indicators. NOTE: Ensure battery is fully charged before proceeding. Ensure steps are followed in correct order or procedure may need to be repeated.
After SECURITY indicator light goes off, turn ignition off for 30 seconds. Attempt to start engine and then leave ignition on. After engine has stalled, leave ignition on for 10 minutes. SECURITY indicator light will come on for 10 minutes and then go off. After SECURITY indicator light goes off, turn ignition off for 30 seconds.
Attempt to start engine and then leave ignition on. After engine has stalled, leave ignition on for 10 minutes. SECURITY indicator light will come on for 10 minutes and then go off.
Turn ignition off for 30 seconds. Turn ignition on and wait 30 seconds. Attempt to start engine. If engine starts, password learn procedure is complete. If engine does not start, ensure procedure was properly followed. If procedure was properly followed, check for any DTCs. If any DTCs exist, perform test procedures for specified DTC and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.

Vehicle Driveability Computer Relearn Procedure (2.2L)

Vehicle Driveability Computer Relearn Procedure (4.3L)

CUTAWAY, EXPRESS, RV CUTAWAY & SAVANA

Note. Read all procedures listed to determine why and when each procedure is to be performed before proceeding.

Note. References to California models apply to California emission vehicles, which may be verified by underhood Emission Control label. California emissions may be available in other states.

Electronically Erasable Programmable Read Only Memory (EEPROM) Programming (4.3L, 4.8L, 5.0L, 5.3L, 5.7L & 6.0L)

If Vehicle Control Module (VCM) was replaced, the EEPROM in the VCM must be programmed. If EEPROM is not programmed, a Diagnostic Trouble Code (DTC) will be set in the VCM.
Ensure battery is fully charged. Ensure cable is properly connected on Data Link Connector (DLC). Turn ignition on. Perform EEPROM programming using the Techline equipment manufacturer's instructions and latest software applicable for the vehicle model.
Once EEPROM is reprogrammed, Crankshaft Position (CKP) sensor variation learn procedure and password learn procedure for anti-theft system must be performed using proper procedure. NOTE: If EEPROM programming fails, ensure all electrical connections on VCM are okay. Check Techline for latest software. If EEPROM programming still fails, replace VCM.
Once Crankshaft Position (CKP) sensor variation learn procedure and password learn procedure for anti-theft system are performed, perform powertrain On-Board Diagnostic (OBD) system check. See POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.

Electronically Erasable Programmable Read Only Memory (EEPROM) Programming (7.4L)

If Vehicle Control Module (VCM) was replaced, the EEPROM in the VCM must be programmed. If EEPROM is not programmed, a Diagnostic Trouble Code (DTC) will be set in the VCM.
Ensure battery is fully charged. Ensure cable is properly connected on Data Link Connector (DLC). Turn ignition on. Perform EEPROM programming using the Techline equipment manufacturer's instructions and latest software applicable for the vehicle model. NOTE: Crankshaft Position (CKP) sensor variation learn procedure should ONLY be performed on Except Calif. models. DO NOT perform CKP sensor variation learn procedure on Calif. models. Verify vehicle application by using underhood Emission Control label. NOTE: If EEPROM programming fails, ensure all electrical connections on VCM are okay. Check Techline for latest software. If EEPROM programming still fails, replace VCM.
Once EEPROM is reprogrammed, use scan tool to reset Idle Air Control (IAC) valve. On Calif. models, go to next step. On Except Calif. models, go to step 5).
Once EEPROM is reprogrammed, password learn procedure for anti-theft system must be performed using proper procedure. Once password learn procedure for anti-theft system has been performed, perform powertrain On-Board Diagnostic (OBD) system check. See POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
Once EEPROM is reprogrammed, Crankshaft Position (CKP) sensor variation learn procedure and password learn procedure for anti-theft system must be performed using proper procedure. Once Crankshaft Position (CKP) sensor variation learn procedure and password learn procedure for anti-theft system are performed, perform powertrain On-Board Diagnostic (OBD) system check. See POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.

Powertrain Control Module (PCM) Programming (6.5L Diesel)

If PCM was replaced, the PCM must be programmed. If PCM is not programmed, a Diagnostic Trouble Code (DTC) will be set in the PCM.
Ensure battery is fully charged. Ensure cable at Data Link Connector (DLC) and power supply for scan tool are properly connected. Turn ignition on. Perform EEPROM programming using the Techline equipment manufacturer's instructions and latest software applicable for the vehicle model.
Perform password learn procedure for anti-theft system using proper procedure. Once PCM is programmed, if only the PCM was replaced, go to next step. If the crankshaft position sensor, engine or PCM with fuel injection pump were replaced, perform TDC offset learn procedure. NOTE: If PCM programming fails, ensure all electrical connections on PCM are okay. Check Techline for latest software. If EEPROM programming still fails, replace PCM.
Start engine and warm engine until engine coolant temperature is at least 170°F (77°C). This will allow TDC offset to be programmed into the PCM if necessary. The PCM has the ability to determine the amount of offset required to bring the engine to TDC. PCM uses the TDC to determine proper fuel injection pump timing. If TDC offset is not programmed, a Diagnostic Trouble Code (DTC) P1214 will be set in the PCM.

TDC Offset Learn Procedure (6.5L Diesel)

Procedure must be performed if any of the following have been done or exists: If sent here from Diagnostic Trouble Code (DTC) P1214. Engine has been replaced. Crankshaft position sensor or engine front cover has been replaced. Powertrain Control Module (PCM) and fuel injection pump have been replaced. NOTE: DO NOT perform procedure unless sent here from DTC P1214 or one of the components listed above have been replaced.
The PCM has the ability to determine amount of offset required to bring the engine to TDC when TDC offset is not present or has been cleared. This procedure must be performed to allow PCM to be updated with the correct TDC offset for vehicle application.
Install scan tool on Data Link Connector (DLC). Start engine and warm engine until engine coolant temperature is at least 170°F (77°C). Using scan tool, clear DTCs from PCM. Turn ignition on with engine off. Fully depress and hold throttle at full throttle for at least 45 seconds.
Turn ignition off for 30 seconds. Start engine. Verify scan tool indicates TDC offset has been cleared to zero. If TDC offset has been cleared to zero, go to next step. If TDC offset has not been cleared to zero, repeat step 3) until TDC offset has been cleared to zero.
With engine running, use scan tool to verify engine coolant temperature is greater than 170°F (77°C). It may be necessary to drive vehicle to obtain correct engine coolant temperature if engine coolant temperature is less than specified.
As soon at engine coolant temperature is greater than 170°F (77°C) and engine speed is less than 1500 RPM, the PCM automatically learns a NEW TDC offset. The NEW TDC offset will overwrite the previous TDC offset. Using scan tool, note NEW TDC offset. TDC offset should be -.25 to -.75.
Shut engine off. If TDC offset is not within specification, go to next step. If TDC offset is within specification, TDC offset learn procedure is complete.
Using Flange Nut Wrench (J41089), loosen fuel injection pump retaining nuts. Fuel injection pump must be rotated to change TDC offset. Rotating fuel injection pump .039" (1.00 mm) will change TDC offset about 2 degrees. Rotating fuel injection pump toward driver's side of vehicle will produce a positive (+) number and rotating fuel injection pump toward passenger's side of vehicle will produce a negative (-) number.
Using Fuel Injection Pump Wrench (J 29872-A), slightly rotate fuel injection pump. Tighten fuel injection pump retaining nuts.
Repeat step 3) through 9) until TDC offset is within specification. If proper TDC offset cannot be obtained, check the following: Ensure engine coolant temperature is greater than 170°F (77°C). Electric connectors at PCM are properly installed. Electric connectors at injection timing stepper motor on side of fuel injection pump is correctly installed. Ensure latest Techline software was used. Check for proper base installation of fuel injection pump. The electric engine shutoff solenoid on top of fuel injection pump should be approximately straight up and down. Fuel injection pump may be defective, although manufacturer states this is highly unlikely.

Crankshaft Position (CKP) Sensor Variation Learn Procedure (4.3L, 5.0L, 5.7L & 7.4L Except Calif.)

Procedure must be performed if any of the following have been done: EEPROM was reprogrammed. If crankshaft position sensor was removed or replaced. Vehicle Control Module (VCM) was replaced.
Install scan tool on Data Link Connector (DLC). Apply parking brake. Block rear wheels. Ensure hood is closed.
Place transmission in Park (A/T models) or Neutral (M/T models). Start engine and warm engine until engine coolant temperature is at least 150°F (65°C). Ensure all accessories are off.
Apply service brakes. With engine idling, use scan tool to select and enable CKP sensor variation learn procedure.
Gradually accelerate engine to 4000 RPM. Quickly release throttle to idle position once CKP sensor variation learn procedure is obtained and engine starts to decelerate. Once CKP sensor variation values are learned, the VCM will return engine control to the operator and engine will respond to throttle position. CAUTION: Ensure throttle is quickly released to idle position once CKP sensor variation learn procedure fuel cut off is obtained and engine starts to decelerate.
If CKP sensor variation learn procedure was completed, turn ignition off for at least 15 seconds and remove scan tool. If CKP sensor variation learn procedure was not completed, a DTC P1336 should be stored in the VCM. Perform test procedures for DTC P1336 and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.

Password Learn Procedure For Anti-Theft System (4.3L, 5.0L & 5.7L)

Password learn procedure must be performed if Vehicle Control Module (VCM), passlock module or passlock sensor is replaced. A password is communicated between VCM and passlock module to provide engine operation. If VCM is replaced, the VCM must learn the password from the passlock module.
Attempt to start engine. Engine will start and then stall. After engine stalls, leave ignition on for 10 minutes. After engine stalls the SECURITY indicator light will come on for 10 minutes and then go off. The SECURITY indicator light is located on right corner of instrument panel, just to the right of battery charge indicator. NOTE: Ensure battery is fully charged before proceeding. Ensure steps are followed in correct order or procedure may need to be repeated.
After SECURITY indicator light goes off, turn ignition off for 30 seconds. Attempt to start engine and then leave ignition on. After engine has stalled, leave ignition on for 10 minutes. SECURITY indicator light will come on for 10 minutes and then go off. After SECURITY indicator light goes off, turn ignition off for 30 seconds.
Attempt to start engine and then leave ignition on. After engine has stalled, leave ignition on for 10 minutes. SECURITY indicator light will come on for 10 minutes and then go off.
Turn ignition off for 30 seconds. Turn ignition on and wait 30 seconds. Attempt to start engine. If engine starts, password learn procedure is complete. If engine does not start, ensure procedure was properly followed. If procedure was properly followed, check for any DTCs. If any DTCs exist, perform test procedures for specified DTC and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.

Password Learn Procedure For Anti-Theft System (6.5L Diesel)

Password learn procedure must be performed if Powertrain Control Module (PCM), passlock module or passlock sensor is replaced. A password is communicated between PCM and passlock module to provide engine operation. If PCM is replaced, the PCM must learn the password from the passlock module.
Attempt to start engine. Engine will start and then stall. After engine stalls, leave ignition on for 10 minutes. After engine stalls the SECURITY indicator light will come on for 10 minutes and then go off. SECURITY indicator light is located on right corner of instrument panel, just to the right of battery charge indicator. NOTE: Ensure battery is fully charged before proceeding. Performing this procedure will cause a Diagnostic Trouble Code (DTC) P1630 to be set in the VCM. It will be necessary to use scan tool to check for DTC P1630 when performing this procedure. Ensure steps are followed in correct order, or procedure may need to be repeated.
After SECURITY indicator light goes off, turn ignition off for 30 seconds. Attempt to start engine and then leave ignition on. After engine has stalled, leave ignition on for 10 minutes. SECURITY indicator light will come on for 10 minutes and then go off. After SECURITY indicator light goes off, turn ignition off for 30 seconds.
Attempt to start engine and then leave ignition on. After engine has stalled, leave ignition on for 10 minutes. SECURITY indicator light will come on for 10 minutes and then go off or until DTC 1630 is set in PCM.
Turn ignition off for 30 seconds. Turn ignition on and wait 30 seconds. Attempt to start engine. If engine starts, password learn procedure is complete. Ensure DTC 1630 is cleared from PCM by turning ignition off for 30 seconds and then turning ignition on again. If DTC 1630 is not cleared from PCM, perform test procedures for DTC 1630 and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. NOTE: DTC 1630 will be set in PCM as result of this procedure. DTC P1630 may be cleared from PCM by turning ignition off for 30 seconds and then turning ignition on again.
If engine does not start, ensure procedure was properly followed. If procedure was properly followed, check for any DTCs. If any DTCs exist, perform test procedures for specified DTC and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.

Password Learn Procedure For Anti-Theft System (7.4L)

Password learn procedure must be performed if Vehicle Control Module (VCM), passlock module or passlock sensor is replaced. A password is communicated between VCM and passlock module to provide engine operation. If VCM is replaced, the VCM must learn the password from the passlock module.
Attempt to start engine. Engine will start and then stall. After engine stalls, leave ignition on for 10 minutes. After engine stalls the SECURITY indicator light will come on for 10 minutes and then go off. SECURITY indicator light is located on right corner of instrument panel, just to the right of battery charge indicator. NOTE: Ensure battery is fully charged before proceeding. Performing this procedure will cause a Diagnostic Trouble Code (DTC) P1630 to be set in the VCM. It will be necessary to use scan tool to check for DTC P1630 when performing this procedure. Ensure steps are followed in correct order or procedure may need to be repeated.
After SECURITY indicator light goes off, turn ignition off for 30 seconds. Attempt to start engine and then leave ignition on. After engine has stalled, leave ignition on for 10 minutes. SECURITY indicator light will come on for 10 minutes and then go off. After SECURITY indicator light goes off, turn ignition off for 30 seconds.
Attempt to start engine and then leave ignition on. After engine has stalled, leave ignition on for 10 minutes. SECURITY indicator light will come on for 10 minutes and then go off or until DTC 1630 is set in VCM.
Turn ignition off for 30 seconds. Turn ignition on and wait 30 seconds. Attempt to start engine. If engine starts, password learn procedure is complete. Ensure DTC 1630 is cleared from VCM by turning ignition off for 30 seconds and then turning ignition on again. If DTC 1630 is not cleared from VCM, perform test procedures for DTC 1630 and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. NOTE: DTC 1630 will be set in VCM as result of this procedure. DTC P1630 may be cleared from VCM by turning ignition off for 30 seconds and then turning ignition on again.
If engine does not start, ensure procedure was properly followed. If procedure was properly followed, check for any DTCs. If any DTCs exist, perform test procedures for specified DTC and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.

Vehicle Driveability Computer Relearn Procedure (4.3L, 5.0L, 5.7L & 7.4L)

Vehicle Driveability Computer Relearn Procedure (6.5L Diesel)

ESCALADE, PICKUP, SIERRA, SILVERADO, SUBURBAN, TAHOE & YUKON

Note. Read all procedures listed to determine why and when each procedure is to be performed before proceeding.

Note. References to California models apply to California emission vehicles, which may be verified by underhood Emission Control label. California emissions may be available in other states.

Electronically Erasable Programmable Read Only Memory (EEPROM) Programming (4.3L, 5.0L & 5.7L)

If Vehicle Control Module (VCM) was replaced, the EEPROM in the VCM must be programmed. If EEPROM is not programmed, a Diagnostic Trouble Code (DTC) will be set in the VCM.
Ensure battery is fully charged. Ensure cable is properly connected on Data Link Connector (DLC). Turn ignition on. Perform EEPROM programming using the Techline equipment manufacturer's instructions and latest software applicable for the vehicle model.
Once EEPROM is reprogrammed, Crankshaft Position (CKP) sensor variation learn procedure and password learn procedure for anti-theft system must be performed using proper procedure. NOTE: If EEPROM programming fails, ensure all electrical connections on VCM are okay. Check Techline for latest software. If EEPROM programming still fails, replace VCM.
Once Crankshaft Position (CKP) sensor variation learn procedure and password learn procedure for anti-theft system are performed, perform powertrain On-Board Diagnostic (OBD) system check. See POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.

If Vehicle Control Module (VCM) was replaced, the EEPROM in the VCM must be programmed. If EEPROM is not programmed, a Diagnostic Trouble Code (DTC) will be set in the VCM.
Ensure battery is fully charged. Ensure cable is properly connected on Data Link Connector (DLC). Turn ignition on. Perform EEPROM programming using the Techline equipment manufacturer's instructions and latest software applicable for the vehicle model.
Crankshaft Position (CKP) sensor variation learn procedure should ONLY be performed on Except Calif. models. DO NOT perform CKP sensor variation learn procedure on Calif. models. Verify vehicle application by using underhood Emission Control label. If EEPROM programming fails, ensure all electrical connections on VCM are okay. Check Techline for latest software. If EEPROM programming still fails, replace VCM. Once EEPROM is reprogrammed, use scan tool to reset Idle Air Control (IAC) valve. On Calif. models, go to next step. On Except Calif. models, go to step 5).
Once EEPROM is reprogrammed, password learn procedure for anti-theft system must be performed using proper procedure. Once password learn procedure for anti-theft system has been performed, perform powertrain On-Board Diagnostic (OBD) system check. See POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
Once EEPROM is reprogrammed, Crankshaft Position (CKP) sensor variation learn procedure and password learn procedure for anti-theft system must be performed using proper procedure. Once Crankshaft Position (CKP) sensor variation learn procedure and password learn procedure for anti-theft system are performed, perform powertrain On-Board Diagnostic (OBD) system check. See POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.

Powertrain Control Module (PCM) Programming (4.8L, 5.3L & 6.0L)

Ensure battery is fully charged. Turn ignition on. Program PCM using the Techline equipment manufacturer's instructions and latest software applicable for the vehicle model.
Once PCM is reprogrammed, Crankshaft Position (CKP) sensor variation learn procedure, password learn procedure for anti-theft system, and PCM idle learn procedure must be performed.

Note. If programming fails, ensure all electrical connections on PCM are okay. Check Techline for latest software. If programming still fails, replace PCM.

If PCM was replaced, the PCM must be programmed. If PCM is not programmed, a Diagnostic Trouble Code (DTC) will be set in the PCM.
Ensure battery is fully charged. Ensure cable at Data Link Connector (DLC) and power supply for scan tool are properly connected. Turn ignition on. Perform EEPROM programming using the Techline equipment manufacturer's instructions and latest software applicable for the vehicle model.
Perform password learn procedure for anti-theft system using proper procedure. Once PCM is programmed, if only the PCM was replaced, go to next step. If the crankshaft position sensor, engine or PCM with fuel injection pump were replaced, perform TDC offset learn procedure. NOTE: If PCM programming fails, ensure all electrical connections on PCM are okay. Check Techline for latest software. If EEPROM programming still fails, replace PCM.
Start engine and warm engine until engine coolant temperature is at least 170°F (77°C). This will allow TDC offset to be programmed into the PCM if necessary. The PCM has the ability to determine the amount of offset required to bring the engine to TDC. PCM uses the TDC offset to determine proper fuel injection pump timing. If TDC offset is not programmed, a Diagnostic Trouble Code (DTC) P1214 will be set in the PCM.

Procedure must be performed if any of the following have been done or exists: If sent here from Diagnostic Trouble Code (DTC) P1214. Engine has been replaced. Crankshaft position sensor or engine front cover has been replaced. Powertrain Control Module (PCM) and fuel injection pump have been replaced. NOTE: DO NOT perform procedure unless sent here from DTC P1214 or one of the components listed above has been replaced.
The PCM has the ability to determine amount of offset required to bring the engine to TDC when TDC offset is not present or has been cleared. This procedure must be performed to allow PCM to be updated with the correct TDC offset for vehicle application.
Install scan tool on Data Link Connector (DLC). Start engine and warm engine until engine coolant temperature is at least 170°F (77°C). Using scan tool, clear DTCs from PCM. Turn ignition on with engine off. Fully depress and hold throttle at full throttle for at least 45 seconds.
Turn ignition off for 30 seconds. Start engine. Verify scan tool indicates TDC offset has been cleared to zero. If TDC offset has been cleared to zero, go to next step. If TDC offset has not been cleared to zero, repeat step 3) until TDC offset has been cleared to zero.
With engine running, use scan tool to verify engine coolant temperature is greater than 170°F (77°C). It may be necessary to drive vehicle to obtain correct engine coolant temperature if engine coolant temperature is less than specified.
As soon at engine coolant temperature is greater than 170°F (77°C) and engine speed is less than 1500 RPM, the PCM automatically learns a NEW TDC offset. The NEW TDC offset will overwrite the previous TDC offset. Using scan tool, note NEW TDC offset. TDC offset should be -.25 to -.75.
Shut engine off. If TDC offset is not within specification, go to next step. If TDC offset is within specification, TDC offset learn procedure is complete.
Using Flange Nut Wrench (J41089), loosen fuel injection pump retaining nuts. Fuel injection pump must be rotated to change TDC offset. Rotating fuel injection pump .039" (1.00 mm) will change TDC offset about 2 degrees. Rotating fuel injection pump toward driver's side of vehicle will produce a positive (+) number and rotating fuel injection pump toward passenger's side of vehicle will produce a negative (-) number.
Using Fuel Injection Pump Wrench (J 29872), slightly rotate fuel injection pump. Tighten fuel injection pump retaining nuts.
Repeat steps 3) through 9) until TDC offset is within specification. If proper TDC offset cannot be obtained, check the following: Ensure engine coolant temperature is greater than 170°F (77°C). Electric connectors at PCM are properly installed. Electric connectors at injection timing stepper motor on side of fuel injection pump is correctly installed. Ensure latest Techline software was used. Check for proper base installation of fuel injection pump. The electric engine shutoff solenoid on top of fuel injection pump should be approximately straight up and down. Fuel injection pump may be defective, although manufacturer states this is highly unlikely.

Crankshaft Position (CKP) Sensor Variation Learn Procedure (4.3L, 4.8L, 5.0L, 5.3L, 5.7L, 6.0L & 7.4L)

Procedure must be performed if any of the following have been done: EEPROM was reprogrammed. If crankshaft position sensor was removed or replaced. Vehicle Control Module (VCM) was replaced.
Install scan tool on Data Link Connector (DLC). Apply parking brake. Block rear wheels. Ensure hood is closed.
Place transmission in Park (A/T models) or Neutral (M/T models). Start engine and warm engine until engine coolant temperature is at least 150°F (65°C). Ensure all accessories are off.
Apply service brakes. With engine idling, use scan tool to select and enable CKP sensor variation learn procedure.
Gradually accelerate engine to 4000 RPM. Quickly release throttle to idle position once CKP sensor variation learn procedure is obtained and engine starts to decelerate. Once CKP sensor variation values are learned, the VCM will return engine control to the operator and engine will respond to throttle position. CAUTION: Ensure throttle is quickly released to idle position once CKP sensor variation learn procedure fuel cut off is obtained and engine starts to decelerate.
If CKP sensor variation learn procedure was completed, turn ignition off for at least 15 seconds and remove scan tool. If CKP sensor variation learn procedure was not completed, a DTC P1336 should be stored in the VCM. Perform test procedures for DTC P1336 and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.

Password Learn Procedure For Anti-Theft System (4.3L, 4.8L, 5.3L & 6.0L)

Password relearn procedure must be performed if passlock sensor, Body Control Module (BCM), PCM or Vehicle Control Module (VCM) are replaced. Ensure battery is fully charged.
Using scan tool, erase Diagnostic Trouble Codes (DTCs). Turn ignition switch from OFF to CRANK position, allowing vehicle to try and start. Vehicle will start and then stall. Leave ignition on while observing SECURITY indicator on instrument panel. When security indicator turns off (after about 10 minutes), turn ignition off. Wait 10 seconds. Repeat this step 3 more times. New password will be learned on next start attempt.

Password Learn Procedure For Anti-Theft System (5.0L, 5.7L & 7.4L)

Password learn procedure must be performed if Vehicle Control Module (VCM), passlock module or passlock sensor is replaced. A password is communicated between VCM and passlock module to provide engine operation. If VCM is replaced, the VCM must learn the password from the passlock module.
Attempt to start engine. Engine will start and then stall. After engine stalls, leave ignition on for 10 minutes. After engine stalls, the SECURITY indicator light will come on for 10 minutes and then go off. The SECURITY indicator light is located on upper right corner of instrument panel, just above battery charge indicator. NOTE: Ensure battery is fully charged before proceeding. Performing this procedure will cause a Diagnostic Trouble Code (DTC) P1630 to be set in the VCM. It will be necessary to use scan tool to check for DTC P1630 when performing this procedure. Ensure steps are followed in correct order, or procedure may need to be repeated.
After SECURITY indicator light goes off, turn ignition off for 30 seconds. Attempt to start engine and then leave ignition on. After engine has stalled, leave ignition on for 10 minutes. SECURITY indicator light will come on for 10 minutes and then go off. After SECURITY indicator light goes off, turn ignition off for 30 seconds.
Attempt to start engine and then leave ignition on. After engine has stalled, leave ignition on for 10 minutes. SECURITY indicator light will come on for 10 minutes and then go off or until DTC 1630 is set in VCM.
Turn ignition off for 30 seconds. Turn ignition on and wait 30 seconds. Attempt to start engine. If engine starts, password learn procedure is complete. Ensure DTC 1630 is cleared from VCM by turning ignition off for 30 seconds and then turning ignition on again. If DTC 1630 is not cleared from VCM, perform test procedures for DTC 1630 and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. NOTE: DTC 1630 will be set in VCM as result of this procedure. DTC P1630 may be cleared from VCM by turning ignition off for 30 seconds and then turning ignition on again.
If engine does not start, ensure procedure was properly followed. If procedure was properly followed, check for any DTCs. If any DTCs exist, perform test procedures for specified DTC and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.

Password learn procedure must be performed if Powertrain Control Module (PCM), passlock module or passlock sensor is replaced. A password is communicated between PCM and passlock module to provide engine operation. If PCM is replaced, the PCM must learn the password from the passlock module.
Attempt to start engine. Engine will start and then stall. After engine stalls, leave ignition on for 10 minutes. After engine stalls, the SECURITY indicator light will come on for 10 minutes and then go off. SECURITY indicator light is located on upper right corner of instrument panel, just above battery charge indicator. After SECURITY indicator light goes off, turn ignition off for 30 seconds. NOTE: Ensure battery is fully charged before proceeding. Performing this procedure will cause a Diagnostic Trouble Code (DTC) P1630 to be set in the VCM. It will be necessary to use scan tool to check for DTC P1630 when performing this procedure. Ensure steps are followed in correct order, or procedure may need to be repeated.
Attempt to start engine and then leave ignition on. After engine has stalled, leave ignition on for 10 minutes. SECURITY indicator light will come on for 10 minutes and then go off. After SECURITY indicator light goes off, turn ignition off for 30 seconds.
Attempt to start engine and then leave ignition on. After engine has stalled, leave ignition on for 10 minutes. SECURITY indicator light will come on for 10 minutes and then go off or until DTC 1630 is set in PCM.
Turn ignition off for 30 seconds. Turn ignition on and wait 30 seconds. Attempt to start engine. If engine starts, password learn procedure is complete. Ensure DTC 1630 is cleared from PCM by turning ignition off for 30 seconds and then turning ignition on again. If DTC 1630 is not cleared from PCM, perform test procedures for DTC 1630 and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. NOTE: DTC 1630 will be set in PCM as result of this procedure. DTC P1630 may be cleared from PCM by turning ignition off for 30 seconds and then turning ignition on again.
If engine does not start, ensure procedure was properly followed. If procedure was properly followed, check for any DTCs. If any DTCs exist, perform test procedures for specified DTC and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.

Vehicle Driveability Computer Relearn Procedure (4.8L, 5.3L & 6.0L)

On manual transmission vehicles, go to next step. On automatic transmission vehicles, turn ignition off. Reconnect PCM battery connection. Turn A/C off. Set parking brake and block drive wheels. Start and run engine so coolant reaches 176°F (80°C). Shift transmission into Drive. Idle engine for 5 minutes. Shift transmission into Park. Idle engine another 5 minutes. Turn engine off for 30 seconds. PCM relearn procedure is completed.
On manual transmission vehicles, turn ignition off. Reconnect PCM battery connection. Turn A/C off. Set parking brake and block drive wheels. Shift transmission into Neutral. Start and run engine so coolant reaches 176°F (80°C). Idle engine for 5 minutes. Turn engine off for 30 seconds. PCM relearn procedure is completed.

FORWARD CONTROL & MOTORHOME CHASSIS

Note. Read all procedures listed to determine why and when each procedure is to be performed before proceeding.

Note. References to California models apply to California emission vehicles, which may be verified by underhood Emission Control label. California emissions may be available in other states.

Electronically Erasable Programmable Read Only Memory (EEPROM) Programming (4.3L & 5.7L)

If Vehicle Control Module (VCM) was replaced, the EEPROM in the VCM must be programmed. If EEPROM is not programmed, a Diagnostic Trouble Code (DTC) will be set in the VCM.
Ensure battery is fully charged. Ensure cable is properly connected on Data Link Connector (DLC). Turn ignition on. Perform EEPROM programming using the Techline equipment manufacturer's instructions and latest software applicable for the vehicle model. NOTE: If EEPROM programming fails, ensure all electrical connections on VCM are okay. Check Techline for latest software. If EEPROM programming still fails, replace VCM.
Once EEPROM has been reprogrammed, Crankshaft Position (CKP) sensor variation learn procedure must be performed using proper procedure. Once Crankshaft Position (CKP) sensor variation learn procedure has been performed, perform powertrain On-Board Diagnostic (OBD) system check. See POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.

If Vehicle Control Module (VCM) was replaced, the EEPROM in the VCM must be programmed. If EEPROM is not programmed, a Diagnostic Trouble Code (DTC) will be set in the VCM.
Ensure battery is fully charged. Ensure cable is properly connected on Data Link Connector (DLC). Turn ignition on. Perform EEPROM programming using the Techline equipment manufacturer's instructions and latest software applicable for the vehicle model.
Once EEPROM has been reprogrammed, use scan tool to reset Idle Air Control (IAC) valve. On Calif. models, go to next step. On Except Calif. models, go to step 5). NOTE: If EEPROM programming fails, ensure all electrical connections on VCM are okay. Check Techline for latest software. If EEPROM programming still fails, replace VCM. NOTE: Crankshaft Position (CKP) sensor variation learn procedure should ONLY be performed on Except Calif. models. DO NOT perform CKP sensor variation learn procedure on Calif. models. Verify vehicle application by using underhood Emission Control label.
Once EEPROM has been reprogrammed, perform powertrain On-Board Diagnostic (OBD) system check. See POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
Once EEPROM has been reprogrammed, Crankshaft Position (CKP) sensor variation learn procedure must be performed using proper procedure. Once Crankshaft Position (CKP) sensor variation learn procedure has been completed, perform powertrain On-Board Diagnostic (OBD) system check. See POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.

Powertrain Control Module (PCM) Programming (6.5L Non-Turbo Diesel With Electronic Fuel Injection (EFI) & 6.5L Turbo Diesel)

If PCM was replaced, the PCM must be programmed. If PCM is not programmed, a Diagnostic Trouble Code (DTC) will be set in the PCM.
Ensure battery is fully charged. Ensure cable at Data Link Connector (DLC) and power supply for scan tool are properly connected. Turn ignition on. Perform EEPROM programming using the Techline equipment manufacturer's instructions and latest software applicable for the vehicle model.
Once PCM has been programmed, if only the PCM was replaced, go to next step. If the crankshaft position sensor, engine or PCM with fuel injection pump were replaced, perform TDC offset learn procedure. NOTE: If PCM programming fails, ensure all electrical connections on PCM are okay. Check Techline for latest software. If EEPROM programming still fails, replace PCM.
Start engine and warm engine until engine coolant temperature is at least 170°F (77°C). This will allow TDC offset to be programmed into the PCM if necessary. The PCM has the ability to determine the amount of offset required to bring the engine to TDC. PCM uses the TDC offset to determine proper fuel injection pump timing. If TDC offset is not programmed, a Diagnostic Trouble Code (DTC) P1214 will be set in the PCM.

Note. PCM will only perform an auto learn when a TDC offset is not present (new or reprogrammed PCM).

PCM will automatically activate TDC offset program when engine coolant is greater than 170°F (77°C) and engine speed is 900 RPM or less. A momentary engine stumble will occur once engine has reached desired temperature and RPM. This is an indication that PCM auto learn function has been activated. If offset is programmed out of range, DTC P1214 will set.

Crankshaft Position (CKP) Sensor Variation Learn Procedure (4.3L, 5.7L & 7.4L Except Calif.)

Procedure must be performed if any of the following have been done: EEPROM was reprogrammed. If crankshaft position sensor was removed or replaced. Vehicle Control Module (VCM) was replaced.
Install scan tool on Data Link Connector (DLC). Apply parking brake. Block rear wheels. Ensure hood is closed.
Place transmission in Park (A/T models) or Neutral (M/T models). Start engine and warm engine until engine coolant temperature is at least 150°F (65°C). Ensure all accessories are off.
Apply service brakes. With engine idling, use scan tool to select and enable CKP sensor variation learn procedure.
Gradually accelerate engine to 4000 RPM. Quickly release throttle to idle position once CKP sensor variation learn procedure is obtained and engine starts to decelerate. Once CKP sensor variation values are learned, the VCM will return engine control to the operator and engine will respond to throttle position. CAUTION: Ensure throttle is quickly released to idle position once CKP sensor variation learn procedure fuel cut off is obtained and engine starts to decelerate.
If CKP sensor variation learn procedure was completed, turn ignition off for at least 15 seconds and remove scan tool. If CKP sensor variation learn procedure was not completed, a DTC P1336 should be stored in the VCM. Perform test procedures for DTC P1336 and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.

Vehicle Driveability Computer Relearn Procedure (4.3L, 5.7L & 7.4L)

MONTANA, SILHOUETTE & VENTURE

Note. Read all procedures listed to determine why and when each procedure is to be performed before proceeding.

If Powertrain Control Module (PCM) was replaced, the EEPROM in the PCM must be programmed. If EEPROM is not programmed, a Diagnostic Trouble Code (DTC) will be set in the PCM.
Ensure battery is fully charged. If battery is being charged, ensure battery charger is disconnected before performing EEPROM programming procedure.
Ensure cable is properly connected on Data Link Connector (DLC). Turn ignition on. Perform EEPROM programming using the Techline equipment manufacturer's instructions and latest software applicable for the vehicle model.
Once EEPROM has been reprogrammed, perform powertrain On-Board Diagnostic (OBD) system check. See POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. Ensure engine is idling for one minute before checking for DTCs when performing powertrain OBD system check. Also, after EEPROM has been reprogrammed, the Crankshaft Position (CKP) sensor variation learn procedure must be performed using proper procedure.

Note. If EEPROM programming fails, ensure all electrical connections on PCM are okay. Check Techline for latest software. If EEPROM programming still fails, replace PCM.

Procedure must be performed if any of the following have been done or exist: EEPROM was reprogrammed. If Diagnostic Trouble Code (DTC) P1336 exists. If crankshaft, crankshaft position sensor, engine, Powertrain Control Module (PCM) or vibration damper have been replaced.
CKP sensor variation compensating values are stored in Powertrain Control Module (PCM) after a learn procedure has been performed. If actual CKP sensor values are not within specification, Diagnostic Trouble Code (DTC) P0300 will be stored in the PCM.
Using scan tool, check for stored DTCs. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If no DTCs exist, or if DTC P1336 exists, go to next step. If any DTCs exist except for P1336, perform test procedures for specified DTC and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. Ensure all DTCs are learned from PCM. Go to next step.
Ensure ignition is off. Apply parking brake. Block front wheels. Ensure hood is closed. Start engine and warm engine until engine coolant temperature is at least 158°F (70°C). Turn ignition off. NOTE: Ensure engine coolant temperature is at least 158°F (70°C) before performing CKP sensor variation learn procedure.
Using scan tool, select and enable CKP sensor variation learn procedure. Start engine. Apply service brakes. Ensure transaxle is in Park.
Accelerate engine until CKP sensor variation learn procedure fuel cut off is obtained at 5150 RPM. Quickly release throttle to idle position once CKP sensor variation learn procedure fuel cut off is obtained and engine starts to decelerate. Once CKP sensor variation values are learned, the PCM will return engine control to the operator and engine will respond to throttle position. CAUTION: Ensure throttle is quickly released to idle position once CKP sensor variation learn procedure fuel cut off is obtained.
If CKP sensor variation learn procedure was not terminated, go to next step. If CKP sensor variation learn procedure was terminated, this may be caused by PCM detecting a problem in cam signal causing DTC P0341, 3X crank signal causing DTC P1374 3X, or 24X crank signal causing DTC P0336 24X. Using scan tool, check for stored DTCs. Perform test procedures for specified DTCs and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
Check scan tool for status of DTC P1336. If scan tool indicates DTC P1336 ran and passed, CKP sensor variation learn procedure is complete. If scan tool indicates DTC P1336 failed or was not run, check for any other DTCs. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If any other DTCs exist, perform test procedures for specified DTC and repair as necessary. If no other DTCs exist, repeat CKP sensor variation learn procedure.

TRACKER

Note. Powertrain Control Module (PCM) does not have an reprogrammable EEPROM. No special procedures are required for programming the PCM.

Computer Relearn Procedures Cadillac DeVille Concours I final

INTRODUCTION

ALERO, CUTLASS, GRAND AM & MALIBU

Electronically Erasable Programmable Read Only Memory (EEPROM) Programming (2.4L)

Electronically Erasable Programmable Read Only Memory (EEPROM) Programming (3.1L & 3.4L)

Crankshaft Position (CKP) Sensor Variation Learn Procedure (2.4L)

Crankshaft Position (CKP) Sensor Variation Learn Procedure (Alero 3.4L & Grand Am 3.4L)

Password Learn Procedure For Anti-Theft System (Cutlass & Malibu)

Password Learn Procedure For Anti-Theft System (Alero 3.4L & Grand Am 3.4L)

Vehicle Driveability Computer Relearn Procedure (A/T Models)

Vehicle Driveability Computer Relearn Procedure (M/T Models)

AURORA & RIVIERA

Electronically Erasable Programmable Read Only Memory (EEPROM) Programming (3.8L)

Electronically Erasable Programmable Read Only Memory (EEPROM) Programming (4.0L)

Crankshaft Position (CKP) Sensor Variation Learn Procedure (3.8L)

Engine Oil Life Interval Programming (4.0L)

Transaxle Fluid Life Interval Programming (4.0L)

Vehicle Driveability Computer Relearn Procedure (All Models)

BONNEVILLE, EIGHTY EIGHT & LE SABRE

Electronically Erasable Programmable Read Only Memory (EEPROM) Programming

Crankshaft Position (CKP) Sensor Variation Learn Procedure

Vehicle Driveability Computer Relearn Procedure

CAMARO & FIREBIRD

Idle Learn Procedure (5.7L)

Crankshaft Position (CKP) Sensor Variation Learn Procedure (5.7L)

CATERA

Sun Roof Actuator Programming

CAVALIER & SUNFIRE

Password Learn Procedure For Anti-Theft System

CENTURY, GRAND PRIX, INTRIGUE, LUMINA, MONTE CARLO & REGAL

Electronically Erasable Programmable Read Only Memory (EEPROM) Programming (All Models)

Crankshaft Position (CKP) Sensor Variation Learn Procedure (3.1L)

Crankshaft Position (CKP) Sensor Variation Learn Procedure (3.5L & 3.8L)

CORVETTE

DEVILLE, ELDORADO & SEVILLE

Engine Oil Life Interval Programming

Transaxle Fluid Life Interval Programming

METRO & FIREFLY (CANADIAN)

PARK AVENUE

PRIZM

SATURN

Crankshaft Learn Procedure

ASTRO & SAFARI

BLAZER, BRAVADA, ENVOY, JIMMY, PICKUP & SONOMA

Electronically Erasable Programmable Read Only Memory (EEPROM) Programming (2.2L)

Electronically Erasable Programmable Read Only Memory (EEPROM) Programming (4.3L)

Crankshaft Position (CKP) Sensor Variation Learn Procedure (2.2L & 4.3L)

Password Learn Procedure For Anti-Theft System (2.2L)

Password Learn Procedure For Anti-Theft System (4.3L)

Vehicle Driveability Computer Relearn Procedure (2.2L)

Vehicle Driveability Computer Relearn Procedure (4.3L)

CUTAWAY, EXPRESS, RV CUTAWAY & SAVANA

Electronically Erasable Programmable Read Only Memory (EEPROM) Programming (4.3L, 4.8L, 5.0L, 5.3L, 5.7L & 6.0L)

Electronically Erasable Programmable Read Only Memory (EEPROM) Programming (7.4L)

Powertrain Control Module (PCM) Programming (6.5L Diesel)

TDC Offset Learn Procedure (6.5L Diesel)

Crankshaft Position (CKP) Sensor Variation Learn Procedure (4.3L, 5.0L, 5.7L & 7.4L Except Calif.)

Password Learn Procedure For Anti-Theft System (4.3L, 5.0L & 5.7L)

Password Learn Procedure For Anti-Theft System (6.5L Diesel)

Password Learn Procedure For Anti-Theft System (7.4L)

Vehicle Driveability Computer Relearn Procedure (4.3L, 5.0L, 5.7L & 7.4L)

Vehicle Driveability Computer Relearn Procedure (6.5L Diesel)

ESCALADE, PICKUP, SIERRA, SILVERADO, SUBURBAN, TAHOE & YUKON

Electronically Erasable Programmable Read Only Memory (EEPROM) Programming (4.3L, 5.0L & 5.7L)

Powertrain Control Module (PCM) Programming (4.8L, 5.3L & 6.0L)

Crankshaft Position (CKP) Sensor Variation Learn Procedure (4.3L, 4.8L, 5.0L, 5.3L, 5.7L, 6.0L & 7.4L)

Password Learn Procedure For Anti-Theft System (4.3L, 4.8L, 5.3L & 6.0L)

Password Learn Procedure For Anti-Theft System (5.0L, 5.7L & 7.4L)

Vehicle Driveability Computer Relearn Procedure (4.8L, 5.3L & 6.0L)

FORWARD CONTROL & MOTORHOME CHASSIS

Electronically Erasable Programmable Read Only Memory (EEPROM) Programming (4.3L & 5.7L)

Powertrain Control Module (PCM) Programming (6.5L Non-Turbo Diesel With Electronic Fuel Injection (EFI) & 6.5L Turbo Diesel)

Crankshaft Position (CKP) Sensor Variation Learn Procedure (4.3L, 5.7L & 7.4L Except Calif.)

Vehicle Driveability Computer Relearn Procedure (4.3L, 5.7L & 7.4L)

MONTANA, SILHOUETTE & VENTURE

TRACKER

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