Engine Controls - 5.7l - Introduction Cadillac CTS I

Temperature vs Resistance

Temperature vs Resistance

Altitude vs Barometric Pressure

Altitude vs Barometric Pressure

Ignition System Specifications

Ignition System Specifications

Fastener Tightening Specifications

Fastener Tightening Specifications

Action Taken When the DTC Sets - Type A

The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.

Action Taken When the DTC Sets - Type B

The control module illuminates the MIL on the second consecutive ignition cycle that the diagnostic runs and fails.

Conditions for Clearing the MIL/DTC - Type A or Type B

1. The control module turns OFF the MIL after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC Last Test Failed clears when the diagnostic runs and passes.
3. Use a scan tool in order to clear the MIL and the DTC.

Non-Emissions Related DTCs

Action Taken When the DTC Sets - Type C

1. The control module stores the DTC information into memory when the diagnostic runs and fails.
2. The MIL will not illuminate.
3. The driver information center, if equipped, may display a message.

Conditions for Clearing the DTC - Type C

1. A last test failed, or current DTC, clears when the diagnostic runs and passes.
2. Use a scan tool in order to clear the DTC.

Conditions for Clearing the DTC - Type X

This DTC is available in the PCM software, but has been disabled, or turned OFF. In this case, the diagnostic does not run, no DTCs are stored, and the MIL does not illuminate. Type X DTCs are used primarily for export vehicles that do not require MIL illumination or DTC storing.

Diagnostic Trouble Code (DTC) Type(s)

Diagnostic Trouble Code (DTC) Type(s)

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Engine Controls Schematic Icons

Engine Controls Schematic Icons Icon Icon Definition NOTE: The OBD II symbol is used on the circuit diagrams in order to alert the technician that the circuit is essential for proper OBD II emission control circuit operation. Any circuit which fails and causes the malfunction indicator lamp (MIL) to turn ON, or causes emissions-related component damage, is identified as an OBD II circuit. IMPORTANT: Twisted-pair wires provide an effective shield that helps protect sensitive electronic components from electrical interference. If the wires were covered with shielding, install new shielding. In order to prevent electrical interference from degrading the performance of the connected components, you must maintain the proper specification when making any repairs to the twisted-pair wires shown : The wires must be twisted a minimum of 9 turns per 31 cm (12 in) as measured anywhere along the length of the wires The outside diameter of the twisted wires must not exceed 6.0 mm (0.25 in)

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Powertrain Control Module (PCM) Connector End Views

Powertrain Control Module (PCM) C1 Connector Part Information 12191489 80-Way F Micro-Pack 100W Sealed (BU) Pin Wire Color Circuit No. Function 1 BK 750 Ground 2 L-GN 1867 12-Volt Reference 3 PK/BK 1746 Fuel Injector 3 Control 4 L-GN/BK 1745 Fuel Injector 2 Control 5-6 - - Not Used 7 GY 2705 5-Volt Reference A 8-10 - - Not Used 11 L-BU 1876 Knock Sensor 2 Signal 12 D-BU/WH 1869 CKP Sensor Signal 13 OG/BK 463 Requested Torque Signal 14 TN 800 UART Serial Data 15 D-BU/WH 774 UART Serial Data 16-18 - - Not Used 19 PK 239 Ignition 1 Voltage 20 RD/WH 1440 Battery Positive Voltage 21 YE/BK 1868 Low Reference 22 - - Not Used 23 TN 452 Low Reference 24 BK/WH 1451 Ground 25 TN 1671 HO2S Low Signal - Bank 2 Sensor 2 26 TN 1667 HO2S Low Signal - Bank 2 Sensor 1 27 BK/WH 1551 Ground 28 TN/WH 1669 HO2S Low Signal - Bank 1 Sensor 2 29 TN 1664 HO2S Low Signal - Bank 1 Sensor 1 30-34 - - Not Used 35 BN/WH 379 CPP Switch Signal 36 TN 1744 Fuel Injector 1 Control 37 YE/BK 846 Fuel Injector 6 Control 38 - - Not Used 39 YE 447 Starter Relay Coil Control 40 BK 750 Ground 41 - - Not Used 42 D-GN 335 Low Speed Cooling Fan Relay Control 43 OG/BK 877 Fuel Injector 7 Control 44 L-BU/BK 844 Fuel Injector 4 Control 45 GY 2700 5-Volt Reference B 46 GY 596 5-Volt Reference B 47 - - Not Used 48 GY 2704 5-Volt Reference A 49-50 - - Not Used 51 D-BU 496 Knock Sensor 1 Signal 52 - - Not Used 53 OG/BK 1057 Low Reference 54 OG/BK 469 Low Reference 55-56 - - Not Used 57 RD/WH 1440 Battery Positive Voltage 58 PU 1807 Class 2 Serial Data 59 PU 1807 Class 2 Serial Data 60 - - Not Used 61 PK/BK 632 Low Reference 62 GY 847 Extended Travel Brake Switch Signal 63 BK 2755 Low Reference 64 BK/WH 1451 Ground 65 PU 1670 HO2S High Signal - Bank 2 Sensor 2 66 PU 1666 HO2S High Signal - Bank 2 Sensor 1 67 BK/WH 1551 Ground 68 PU/WH 1668 HO2S High Signal - Bank 1 Sensor 2 69 PU/WH 1665 HO2S High Signal - Bank 1 Sensor 1 70 BN 1174 Oil Level Switch Signal 71-72 - - Not Used 73 BN/WH 633 CMP Sensor Signal 74 YE 410 ECT Sensor Signal 75 - - Not Used 76 TN/WH 845 Fuel Injector 5 Control 77 D-BU/WH 878 Fuel Injector 8 Control 78 - - Not Used 79 GY 587 Skip/Shift Solenoid Control 80 TN 2761 Low Reference

Powertrain Control Module (PCM) C2 Connector Part Information 12191488 80-Way F Micro-Pack 100W Sealed (GN) Pin Wire Color Circuit No. Function 1 BK 750 Ground 2-4 - - Not Used 5 TN/BK 464 Delivered Torque Signal 6-8 - - Not Used 9 D-GN/WH 465 Fuel Pump Relay Control 10 WH 121 Engine Speed Signal 11-13 - - Not Used 14 OG/BK 380 A/C Refrigerant Pressure Sensor Signal 15 OG 225 Generator Turn On Signal 16-17 - - Not Used 18 PU/WH 1035 Starter Relay Coil Supply Voltage 19 - - Not Used 20 L-GN/BK 822 VSS Low Signal 21 PU/WH 821 VSS High Signal 22-24 - - Not Used 25 TN 472 IAT Sensor Signal 26 PU 2121 IC 1 Control 27 OG 2127 IC 7 Control 28 L-BU/WH 2126 IC 6 Control 29 D-GN/WH 2124 IC 4 Control 30 - - Not Used 31 YE 492 MAF Sensor Signal 32 L-GN 432 MAP Sensor Signal 33 D-BU 473 High Speed Cooling Fan Relay Control 34 D-GN/WH 428 EVAP Canister Purge Solenoid Control 35-38 - - Not Used 39 OG 631 12-Volt Reference 40 BK 750 Ground 41-42 - - Not Used 43 D-GN/WH 459 A/C Compressor Clutch Relay Control 44 L-GN 1652 Reverse Lockout Solenoid Control 45 WH 1310 EVAP Canister Vent Solenoid Control 46 BN/WH 419 MIL Control 47 WH 375 Skip Shift Indicator Control 48-49 - - Not Used 50 BN 818 Vehicle Speed Signal 51 YE/BK 1227 TFT Sensor Signal 52 BN 2391 HO2S Heater Low Control - Bank 1 Sensor 2 53 OG/WH 3223 HO2S Heater Low Control - Bank 2 Sensor 2 54 D-BU 1936 Fuel Level Sensor Signal - Primary 55-56 - - Not Used 57 TN 552 Low Reference 58 TN/WH 331 Oil Pressure Sensor Signal 59 YE 5 Crank Voltage 60 BN 2129 Low Reference 61 BN/WH 2130 Low Reference 62-63 - - Not Used 64 D-GN 890 Fuel Tank Pressure Sensor Signal 65 BN 5069 MAIN Relay Control 66 PU/WH 2128 IC 8 Control 67 OG/WH 2122 IC 2 Control 68 D-GN 2125 IC 5 Control 69 L-BU 2123 IC 3 Control 70-71 - - Not Used 72 GY/WH 3113 HO2S Heater Low Control - Bank 1 Sensor 1 73 L-BU 1937 Fuel Level Sensor Signal - Secondary 74 L-GN 3212 HO2S Heater Low Control - Bank 2 Sensor 1 75 GY 23 Generator Field Duty Cycle Signal 76-79 - - Not Used 80 TN 5514 Low Reference

Engine Controls Connector End Views

Accelerator Pedal Position (APP) Sensor Connector Part Information 15326842 10-Way F 150 Series Sealed (BK) Pin Wire Color Circuit No. Function A GY 1273 Low Reference B PU 1272 Low Reference C L-BU 1162 APP Sensor 2 Signal D TN 1274 5-Volt Reference E YE/BK 1275 5-Volt Reference F D-BU 1161 APP Sensor 1 Signal G L-BU 1276 5-Volt Reference H - - Not Used J BN 1271 Low Reference K D-GN 1163 APP Sensor 3 Signal

Camshaft Position (CMP) Sensor Connector Part Information 12059595 3-Way F Metri-Pack 150 Series Sealed (BK) Pin Wire Color Circuit No. Function A BN/WH 633 CMP Sensor Signal B PK/BK 632 Low Reference C OG 631 12-Volt Reference

Crankshaft Position (CKP) Sensor Connector Part Information 15324165 3-Way F Metri-Pack 150 Series (WH) Pin Wire Color Circuit No. Function A D-BU/WH 1869 CKP Sensor Signal B YE/BK 1868 Low Reference C L-GN 1867 12-Volt Reference

Engine Coolant Temperature (ECT) Sensor Connector Part Information 12162195 2-Way F GT 150 Series Sealed (BK) Pin Wire Color Circuit No. Function A TN 2761 Low Reference B YE 410 ECT Sensor Signal

Engine Oil Level/Temperature Sensor Connector Part Information 15326808 3-Way F GT 150 Series Sealed (BK) Pin Wire Color Circuit No. Function A BN 1174 Oil Level Switch Signal B D-GN/WH 357 Oil Temperature Sensor Signal C BK 1550 Ground

Engine Oil Pressure (EOP) Sensor Connector Part Information 15344137 3-Way F GT 150 Series Sealed (BK) Pin Wire Color Circuit No. Function 1 BK 2755 Low Reference 2 GY 2705 5-Volt Reference 3 TN/WH 331 Oil Pressure Sensor Signal

Evaporative Emission (EVAP) Canister Purge Solenoid Valve Connector Part Information 12052643 2-Way F Metri-Pack 150 Series Sealed (RD) Pin Wire Color Circuit No. Function A PK/BK 5705 Ignition 1 Voltage B D-GN/WH 428 EVAP Canister Purge Solenoid Control

Evaporative Emission (EVAP) Canister Vent Solenoid Valve Connector Part Information 12052643 2-Way F Metri-Pack 150 Series- Sealed (RD) Pin Wire Color Circuit No. Function A PK 1540 Battery Positive Voltage B WH 1310 EVAP Canister Vent Solenoid Control

Fuel Injector 1 Connector Part Information 12129140 2-Way F Micro-Pack 280.1 Series Sealed (BK) Pin Wire Color Circuit No. Function A PK/BK 5291 Ignition 1 Voltage B TN 1744 Fuel Injector 1 Control

Fuel Injector 2 Connector Part Information 12129140 2-Way F Micro-Pack 280.1 Series Sealed (BK) Pin Wire Color Circuit No. Function A PK/BK 5292 Ignition 1 Voltage B L-GN/BK 1745 Fuel Injector 2 Control

Fuel Injector 3 Connector Part Information 12129140 2-Way F Micro-Pack 280.1 Series Sealed (BK) Pin Wire Color Circuit No. Function A PK/BK 5291 Ignition 1 Voltage B PK/BK 1746 Fuel Injector 3 Control

Fuel Injector 4 Connector Part Information 12129140 2-Way F Micro-Pack 280.1 Series Sealed (BK) Pin Wire Color Circuit No. Function A PK/BK 5292 Ignition 1 Voltage B L-BU/BK 844 Fuel Injector 4 Control

Fuel Injector 5 Connector Part Information 12129140 2-Way F Micro-Pack 280.1 Series Sealed (BK) Pin Wire Color Circuit No. Function A PK/BK 5291 Ignition 1 Voltage B TN/WH 845 Fuel Injector 5 Control

Fuel Injector 6 Connector Part Information 12129140 2-Way F Micro-Pack 280.1 Series Sealed (BK) Pin Wire Color Circuit No. Function A PK/BK 5292 Ignition 1 Voltage B YE/BK 846 Fuel Injector 6 Control

Fuel Injector 7 Connector Part Information 12129140 2-Way F Micro-Pack 280.1 Series Sealed (BK) Pin Wire Color Circuit No. Function A PK/BK 5291 Ignition 1 Voltage B OG/BK 877 Fuel Injector 7 Control

Fuel Injector 8 Connector Part Information 12129140 2-Way F Micro-Pack 280.1 Series Sealed (BK) Pin Wire Color Circuit No. Function A PK/BK 5292 Ignition 1 Voltage B D-BU/WH 878 Fuel Injector 8 Control

Fuel Pump and Sender Assembly Connector Part Information 12160482 4-Way F Metri-Pack 150 Series Sealed (BK) Pin Wire Color Circuit No. Function A L-BU 1936 Fuel Level Sensor Signal - Primary B GY 120 Fuel Pump Supply Voltage C BK 1050 Ground D TN 2759 Low Reference

Fuel Tank Pressure Sensor Connector Part Information 12059595 3-Way F Metri-Pack 150 Series Sealed (BK) Pin Wire Color Circuit No. Function A TN 2759 Low Reference B D-GN 890 Fuel Tank Pressure Sensor Signal C GY 2709 5-Volt Reference B

Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 Connector Part Information 12176897 4-Way F Metri-Pack 150 Sealed (GY) Pin Wire Color Circuit No. Function A TN 1664 HO2S Low Signal - Bank 1 Sensor 1 B PU/WH 1665 HO2S High Signal - Bank 1 Sensor 1 C GY/WH 3113 HO2S Heater Low Control - Bank 1 Sensor 1 D PK/BK 5293 Ignition 1 Voltage

Heated Oxygen Sensor (HO2S) Bank 1 Sensor 2 Connector Part Information 15326423 4-Way M Metri-Pack 150 Sealed (GY) Pin Wire Color Circuit No. Function A TN/WH 1669 HO2S Low Signal - Bank 1 Sensor 2 B PU/WH 1668 HO2S High Signal - Bank 1 Sensor 2 C BN 2391 HO2S Heater Low Control - Bank 1 Sensor 2 D PK/BK 5294 Ignition 1 Voltage

Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1 Connector Part Information 12176897 4-Way F Metri-Pack 150 Sealed (GY) Pin Wire Color Circuit No. Function A TN 1667 HO2S Low Signal - Bank 2 Sensor 1 B PU 1666 HO2S High Signal - Bank 2 Sensor 1 C L-GN 3212 HO2S Heater Low Control - Bank 2 Sensor 1 D PK/BK 5293 Ignition 1 Voltage

Heated Oxygen Sensor (HO2S) Bank 2 Sensor 2 Connector Part Information 15326423 4-Way M Metri-Pack 150 Sealed (GY) Pin Wire Color Circuit No. Function A TN 1671 HO2S Low Signal - Bank 2 Sensor 2 B PU 1670 HO2S High Signal - Bank 2 Sensor 2 C OG/WH 3223 HO2S Heater Low Control - Bank 2 Sensor 2 D PK/BK 5294 Ignition 1 Voltage

Ignition Coil/Module 1 Connector Part Information 12162144 4-Way F Metri-Pack 150 Series (BK) Pin Wire Color Circuit No. Function A BK 1451 Ground B BN 2129 Low Reference C PU 2121 IC 1 Control D PK 5291 Ignition 1 Voltage

Ignition Coil/Module 2 Connector Part Information 12162144 4-Way F Metri-Pack 150 Series (BK) Pin Wire Color Circuit No. Function A BK 1551 Ground B BN 2130 Low Reference C RD 2122 IC 2 Control D PK 5292 Ignition 1 Voltage

Ignition Coil/Module 3 Connector Part Information 12162144 4-Way F Metri-Pack 150 Series (BK) Pin Wire Color Circuit No. Function A BK 1451 Ground B BN 2129 Low Reference C L-BU 2123 IC 3 Control D PK 5291 Ignition 1 Voltage

Ignition Coil/Module 4 Connector Part Information 12162144 4-Way F Metri-Pack 150 Series (BK) Pin Wire Color Circuit No. Function A BK 1551 Ground B BN 2130 Low Reference C D-GN 2124 IC 4 Control D PK 5292 Ignition 1 Voltage

Ignition Coil/Module 5 Connector Part Information 12162144 4-Way F Metri-Pack 150 Series (BK) Pin Wire Color Circuit No. Function A BK 1451 Ground B BN 2129 Low Reference C D-GN 2125 IC 5 Control D PK 5291 Ignition 1 Voltage

Ignition Coil/Module 6 Connector Part Information 12162144 4-Way F Metri-Pack 150 Series (BK) Pin Wire Color Circuit No. Function A BK 1551 Ground B BN 2130 Low Reference C L-BU 2126 IC 6 Control D PK 5292 Ignition 1 Voltage

Ignition Coil/Module 7 Connector Part Information 12162144 4-Way F Metri-Pack 150 Series (BK) Pin Wire Color Circuit No. Function A BK 1451 Ground B BN 2129 Low Reference C RD 2127 IC 7 Control D PK 5291 Ignition 1 Voltage

Ignition Coil/Module 8 Connector Part Information 12162144 4-Way F Metri-Pack 150 Series (BK) Pin Wire Color Circuit No. Function A BK 1551 Ground B BN 2130 Low Reference C PU 2128 IC 8 Control D PK 5292 Ignition 1 Voltage

Knock Sensor (KS) 1 Connector Part Information 12176800 1-Way F Metri-Pack 150 Series (GRY) Pin Wire Color Circuit No. Function 1 D-BU 496 Knock Sensor 1 Signal

Knock Sensor (KS) 2 Connector Part Information 12176800 1-Way F Metri-Pack 150 Series (GRY) Pin Wire Color Circuit No. Function 1 L-BU 1876 Knock Sensor 2 Signal

Manifold Absolute Pressure (MAP) Sensor Connector Part Information 12129946 3-Way F Metri-Pack 150 Series Sealed (GY) Pin Wire Color Circuit No. Function A OG/BK 469 Low Reference B L-GN 432 MAP Sensor Signal C GY 2704 5-Volt Reference A

Mass Air Flow (MAF) Sensor Connector Part Information 15305555 5-Way F Metri-Pack 150 Series Sealed (BK) Pin Wire Color Circuit No. Function A TN 552 Low Reference B TN 472 IAT Sensor Signal C BK/WH 751 Ground D PK 739 Ignition 1 Voltage E YE 492 MAF Sensor Signal

Throttle Actuator Control (TAC) Module - C1 Connector Part Information 12191065 16-Way F Micro-Pack 100 Series (WH) Pin Wire Color Circuit No. Function 1 D-BU 417 TP Sensor 1 Signal 2 D-GN 485 5-Volt Reference 3 PU 486 Low Reference 4 D-BU 84 Cruise Control Set/Coast Switch Signal 5 GY/BK 87 Cruise Control Resume/Accel Switch Signal 6 OG 5371 BAS Relay Coil Supply Voltage 7 PK 239 Ignition 1 Voltage 8 BN 582 TAC Motor Control - 2 9 YE/BK 487 5-Volt Reference 10 WH 484 Low Reference 11 PK 427 TP Sensor 2 Signal 12 TN 800 UART Serial Data 13 D-BU/WH 774 UART Serial Data 14 GY 397 Cruise Control On Switch Signal 15 BK 1550 Ground 16 YE 581 TAC Motor Control - 1

Throttle Actuator Control (TAC) Module - C2 Connector Part Information 12186688 10-Way F 150 Series Sealed (BK) Pin Wire Color Circuit No. Function A GY 1273 Low Reference B PU 1272 Low Reference C L-BU 1162 APP Sensor 2 Signal D TN 1274 5-Volt Reference E YE/BK 1275 5-Volt Reference F D-BU 1161 APP Sensor 1 Signal G L-BU 1276 5-Volt Reference H - - Not Used J BN 1271 Low Reference K D-GN 1163 APP Sensor 3 Signal

Throttle Actuator Control (TAC) Motor Connector Part Information 12077900 2-Way F Metri-Pack 280 Series Sealed (BK) Pin Wire Color Circuit No. Function A YE 581 TAC Motor Control - 1 B BN 582 TAC Motor Control - 2

Throttle Position (TP) Sensor Connector Part Information 12186696 6-Way F GT 150.2 Series Sealed (BK) Pin Wire Color Circuit No. Function A D-GN 485 5-Volt Reference B PU 486 Low Reference C D-BU 417 TP Sensor 1 Signal D YE/BK 487 5-Volt Reference E WH 484 Low Reference F PK 427 TP Sensor 2 Signal

Removal Procedure

1. Using a scan tool, retrieve the percentage of remaining engine oil and the remaining automatic transmission fluid life. Record the remaining engine oil and the remaining automatic transmission fluid life.
2. Turn OFF the ignition.
3. Disconnect the battery negative cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
4. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/i-2002-2007/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
5. Remove the front air deflector. Refer to «Air Deflector Replacement - Front»(/cadillac/cts/i-2002-2007/remont/exterior-body-panels/#body-front-end) in Body Front End.
6. Remove the bolt (1) from the powertrain control module (PCM) housing cover.
7. Push the cover outboard to release the locking tab.
8. Swing the cover open and remove the cover from the vehicle.
9. Remove the PCM from the housing.
10. Loosen the screws (1) at the PCM electrical connectors.
11. Disconnect the PCM electrical connectors.
12. Remove the PCM from the vehicle.

Installation Procedure

1. Install the PCM to the vehicle.
2. Install the PCM wiring harness.
3. Tighten the PCM electrical connector screws (1). Tighten: Tighten the PCM electrical connector bolts to 8 N.m (71 lb in).
4. Install the PCM to the PCM housing.
5. Install the PCM housing cover.
6. Install the bolt (1) to the PCM cover housing. Tighten: Tighten the PCM housing cover bolt to 10 N.m (89 lb in).
7. Install the front air deflector. Refer to «Air Deflector Replacement - Front»(/cadillac/cts/i-2002-2007/remont/exterior-body-panels/#body-front-end) in Body Front End.
8. Lower the vehicle.
9. Connect the battery negative cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
10. Program the PCM. Refer to «Service Programming System (SPS)»(/cadillac/cts/i-2002-2007/remont/communication-devices/#service-programming-system) in Programming.

1. Disconnect the battery negative cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
2. Remove the electrical connectors from the TAC module (1, 2).
3. Remove the TAC module from the locking tabs on the relay center bracket.
4. Remove the module from the vehicle.

1. Install the TAC module to the vehicle.
2. Ensure that the module engages with the locking tabs on the relay center bracket.
3. Install the electrical connectors to the TAC module (1, 2).
4. Connect the battery negative cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.

CKP System Variation Learn Procedure

1. Install a scan tool.
2. Monitor the powertrain control module (PCM) for DTCs with a scan tool. If other DTCs are set, except DTC P0315, refer to «Diagnostic Trouble Code (DTC) List»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-diagnostic-information-procedures__diagnostic-trouble-code-dtc-list) for the applicable DTC that set.
3. Select the crankshaft position (CKP) variation learn procedure with a scan tool.
4. The scan tool instructs you to perform the following: Accelerate to wide open throttle (WOT). Release throttle when fuel cut-off occurs. Observe fuel cut-off for applicable engine. Engine should not accelerate beyond calibrated RPM value. Release throttle immediately if value is exceeded. Block drive wheels. Set parking brake. DO NOT apply brake pedal. Cycle ignition from OFF to ON. Apply and hold brake pedal. Start and idle engine. Turn A/C OFF. Vehicle must remain in Park or Neutral. The scan tool monitors certain component signals to determine if all the conditions are met to continue with the procedure. The scan tool only displays the condition that inhibits the procedure. The scan tool monitors the following components: Crankshaft position (CKP) sensors activity-If there is a CKP sensor condition, refer to the applicable DTC that set. Camshaft position (CMP) sensor activity-If there is a CMP sensor condition, refer to the applicable DTC that set. Engine coolant temperature (ECT)-If the ECT is not warm enough, idle the engine until the engine coolant temperature reaches the correct temperature.
5. Enable the CKP system variation learn procedure with a scan tool.
6. Accelerate to WOT.
7. Release throttle when fuel cut-off occurs.
8. Test in progress.
9. The scan tool displays Learn Status: Learned this ignition. If the scan tool indicates that DTC P0315 ran and passed, the CKP variation learn procedure is complete. If the scan tool indicates DTC P0315 failed or did not run, refer to «DTC P0315»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-diagnosis-dtc-p0172-p0507) . If any other DTCs set, refer to «Diagnostic Trouble Code (DTC) List»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-diagnostic-information-procedures__diagnostic-trouble-code-dtc-list) for the applicable DTC that set.
10. Turn OFF the ignition for 30 seconds after the learn procedure is completed successfully.
11. The CKP system variation learn procedure is also required when the following service procedures have been performed, regardless of whether DTC P0315 is set: An engine replacement A PCM replacement A harmonic balancer replacement A crankshaft replacement A CKP sensor replacement Any engine repairs which disturb the crankshaft to CKP sensor relationship

1. Turn OFF the ignition.
2. Raise the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/i-2002-2007/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
3. Drain the engine coolant below the level of the engine coolant temperature (ECT) sensor. Refer to «Draining and Filling Cooling System (LA3, LY9)»(/cadillac/cts/i-2002-2007/remont/cooling-fan/#engine-cooling-system) , «Draining and Filling Cooling System (LY7)»(/cadillac/cts/i-2002-2007/remont/cooling-fan/#engine-cooling-system) or «Draining and Filling Cooling System (LS6)»(/cadillac/cts/i-2002-2007/remont/cooling-fan/#engine-cooling-system) in Engine Cooling.
4. Lower the vehicle.
5. Disconnect the harness connector from the ECT sensor.
6. Remove the ECT sensor.

1. Coat the ECT sensor threads with sealer P/N 12346004 (Canadian P/N 10953480) or the equivalent.
2. Install the ECT sensor. Tighten: Tighten the ECT sensor to 20 N.m (15 lb ft).
3. Connect the ECT sensor electrical connector.
4. Refill the engine coolant. Refer to «Draining and Filling Cooling System (LA3, LY9)»(/cadillac/cts/i-2002-2007/remont/cooling-fan/#engine-cooling-system) , «Draining and Filling Cooling System (LY7)»(/cadillac/cts/i-2002-2007/remont/cooling-fan/#engine-cooling-system) or «Draining and Filling Cooling System (LS6)»(/cadillac/cts/i-2002-2007/remont/cooling-fan/#engine-cooling-system) in Engine Cooling.

1. Remove the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical - 5.7L.
2. Loosen the air cleaner outlet duct clamps (1, 2).
3. Partially remove the air cleaner outlet duct from the air cleaner housing to gain access to the mass air flow/intake air temperature (MAF/IAT) sensor electrical connector.
4. Disconnect the MAF/IAT sensor electrical connector (1).
5. Remove the air cleaner outlet duct assembly.
6. Loosen the MAF/IAT clamp (2).
7. Remove the MAF/IAT sensor from the air cleaner outlet duct. Note the position of the MAF/IAT sensor.

1. Carefully install the MAF/IAT sensor to the air cleaner outlet duct. Ensure that sensor is clocked properly.
2. Tighten the air cleaner outlet duct clamp (2). Tighten: Tighten the air cleaner outlet duct clamp to 3 N.m (27 lb in).
3. Loosely install the air cleaner outlet duct assembly to the vehicle.
4. Connect the MAF/IAT sensor electrical connector.
5. Install the air cleaner outlet duct to the air cleaner housing.
6. Tighten the air cleaner outlet duct clamps (1, 2). Tighten: Tighten the air cleaner outlet duct clamps to 3 N.m (27 lb in).
7. Install the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical - 5.7L.

1. Remove the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical - 5.7L.
2. Disconnect the MAP sensor electrical connector.
3. Pull the MAP sensor forward in order to release the sensor from the retainer.
4. Lift the MAP sensor upward.

1. Install the MAP sensor. Push down the sensor in order to engage the retainer.
2. Connect the MAP sensor harness connector.
3. Install the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical - 5.7L.

1. Raise the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/i-2002-2007/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
2. Disconnect the heated oxygen sensor (HO2S) electrical connector.
3. Remove any wire harness retainers and note the wire harness routing for reassembly.
4. Carefully remove the HO2S (1).

1. Coat the threads of the HO2S with the anti-seize compound P/N 5613695, or the equivalent if necessary.
2. Install the HO2S (1). Tighten: Tighten the HO2S to 41 N.m (30 lb ft).
3. Connect the HO2S electrical connector.
4. Route and attach the wire harness as noted during disassembly.
5. Lower the vehicle.

1. Raise the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/i-2002-2007/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
2. Disconnect the heated oxygen sensor (HO2S) electrical connector. Note the harness routing and retainers for reassembly.
3. Remove the HO2S (1).

1. Coat the threads of the HO2S with the anti-seize compound P/N 5613695, or the equivalent if necessary.
2. Install the HO2S (1). Tighten: Tighten the HO2S to 41 N.m (30 lb ft).
3. Connect the HO2S electrical connector. Ensure that the harness is routed and retained as noted during disassembly.
4. Lower the vehicle.

1. Raise the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/i-2002-2007/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
2. Disconnect the heated oxygen sensor (HO2S) electrical connectors. Note the harness routing and retainers for reassembly.
3. Remove the right side catalytic converter. Refer to «Catalytic Converter Replacement - Right (LA3, LY9)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__catalytic-converter-replacement-right-la3) , «Catalytic Converter Replacement - Right (LY7)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__catalytic-converter-replacement-right-ly7) or «Catalytic Converter Replacement - Right (LS6)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__catalytic-converter-replacement-right-ls6) in Engine Exhaust.
4. Remove the HO2S (1).

1. Coat the threads of the HO2S with the anti-seize compound P/N 5613695, or the equivalent if necessary.
2. Install the HO2S (1). Tighten: Tighten the HO2S to 41 N.m (30 lb ft).
3. Install the right side catalytic converter. Refer to «Catalytic Converter Replacement - Right (LA3, LY9)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__catalytic-converter-replacement-right-la3) , «Catalytic Converter Replacement - Right (LY7)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__catalytic-converter-replacement-right-ly7) or «Catalytic Converter Replacement - Right (LS6)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__catalytic-converter-replacement-right-ls6) in Engine Exhaust.
4. Connect the HO2S electrical connector. Ensure that the harness is routed and retained as noted during disassembly.
5. Lower the vehicle.

1. Raise the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/i-2002-2007/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
2. Disconnect the heated oxygen sensor (HO2S) electrical connector. Note the harness routing and retainers for reassembly.
3. Remove the HO2S (1).

1. Coat the threads of the HO2S with the anti-seize compound P/N 5613695, or the equivalent if necessary.
2. Install the HO2S (1). Tighten: Tighten the HO2S to 41 N.m (30 lb ft).
3. Connect the HO2S electrical connector. Ensure that the harness is routed and retained as noted during disassembly.
4. Lower the vehicle.

1. Remove the closeout/insulator panel from under the dashboard on the drivers side. Refer to «Closeout/Insulator Panel Replacement - Left»(/cadillac/cts/i-2002-2007/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges-and-console) in Instrument Panel, Gages and Console.
2. Disconnect the accelerator pedal position (APP) sensor electrical connector from the accelerator pedal module.
3. Remove the APP sensor mounting bolts.
4. Remove the APP sensor from the vehicle.

1. Position the APP sensor to the mounting plate.
2. Install the APP sensor mounting bolts. Tighten: Tighten the APP sensor mounting bolts to 9 N.m (80 lb in).
3. Connect the APP sensor electrical connector.
4. Operate the accelerator pedal and observe the APP angles using a scan tool. The accelerator pedal should operate freely, without binding between closed throttle and wide open throttle.
5. Install the closeout/insulator panel. Refer to «Closeout/Insulator Panel Replacement - Left»(/cadillac/cts/i-2002-2007/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges-and-console) in Instrument Panel, Gages and Console.

1. Remove the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical - 5.7L.
2. Raise the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/i-2002-2007/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
3. Partially drain the cooling system in order to allow the hoses at the throttle body to be removed. Refer to «Draining and Filling Cooling System (LA3, LY9)»(/cadillac/cts/i-2002-2007/remont/cooling-fan/#engine-cooling-system) , «Draining and Filling Cooling System (LY7)»(/cadillac/cts/i-2002-2007/remont/cooling-fan/#engine-cooling-system) or «Draining and Filling Cooling System (LS6)»(/cadillac/cts/i-2002-2007/remont/cooling-fan/#engine-cooling-system) in Engine Cooling.
4. Lower the vehicle.
5. Loosen the air cleaner outlet duct clamps (1, 2).
6. Remove the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
7. Disconnect the air control valve electrical connector.
8. Disconnect the throttle position (TP) sensor electrical connector.
9. Disconnect the crankcase ventilation hose from the throttle body.
10. Disconnect the coolant hoses from the throttle body.
11. Remove the throttle body attaching bolts.
12. Remove the throttle body and the gasket. IMPORTANT: Do not reuse the throttle body gasket. Install a new gasket during assembly.
13. Discard the throttle body gasket.
14. Inspect the crankcase ventilation hose and the tube. Replace any damaged components.

1. Install a new throttle body gasket.
2. Connect the coolant hoses to the throttle body.
3. Install the throttle body assembly.
4. Install the throttle body attaching bolts. Tighten: Tighten the throttle body bolts to 12 N.m (106 lb in).
5. Connect the TP sensor electrical connector.
6. Connect the crankcase ventilation hose to the throttle body.
7. Connect the air control valve electrical connector.
8. Install the air cleaner outlet duct and clamps (1, 2). Refer to «Air Cleaner Outlet Duct Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
9. Connect the intake air temperature sensor electrical connector.
10. Refill the cooling system. Refer to «Draining and Filling Cooling System (LA3, LY9)»(/cadillac/cts/i-2002-2007/remont/cooling-fan/#engine-cooling-system) , «Draining and Filling Cooling System (LY7)»(/cadillac/cts/i-2002-2007/remont/cooling-fan/#engine-cooling-system) or «Draining and Filling Cooling System (LS6)»(/cadillac/cts/i-2002-2007/remont/cooling-fan/#engine-cooling-system) in Engine Cooling.
11. Check for complete throttle opening and closing positions by operating the accelerator pedal. Monitor the throttle angles, using a scan tool. The accelerator pedal should operate freely without binding between full closed throttle and wide open throttle.
12. Start the engine.
13. Check for coolant leaks.
14. Install the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical - 5.7L.

Throttle Body Cleaning Procedure

1. Remove the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical.
2. Remove the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
3. Inspect the throttle body bore and the throttle body plate for deposits. You will need to open the throttle plate in order to inspect all surfaces.
4. Clean the throttle body bore and the throttle plate using a clean shop towel with GM top engine cleaner, P/N 1052626 or AC Delco Carburetor Tune-up Conditioner, P/N X66P, or equivalent product.
5. Install the air cleaner outlet duct. Refer to «Air Cleaner Outlet Duct Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
6. Install the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical.

Tool Required

J 34730-1A Fuel Pressure Gage

1. Turn the ignition OFF. CAUTION: Refer to the Battery Disconnect Caution in Cautions and Notices.
2. Disconnect the negative battery cable in order to avoid possible fuel discharge if an accidental attempt is made to start the engine. Refer to «Battery Negative Cable Disconnect/Connect Procedure»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
3. Loosen the fuel filler cap in order to relieve the fuel tank vapor pressure.
4. Remove the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical.
5. Connect the J 34730-1A to the fuel pressure connection at the left front of the fuel rail. Wrap a shop towel around the fitting while connecting the gage in order to avoid spillage.
6. Install the bleed hose of the gage into an approved container.
7. Open the valve on the gage to bleed the system pressure. The fuel connections are now safe for servicing.
8. Drain any fuel remaining in the gage into an approved container.

Tools Required

J 34730-1A Fuel Pressure Gage

Note. Clean all of the following areas before performing any disconnections in order to avoid possible contamination in the system: The fuel pipe connections The hose connections The areas surrounding the connections

1. Remove the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical.
2. Install the J 34730-1A to the fuel pressure service connection, located on the left front of the fuel rail.
3. Turn ON the ignition, with the engine OFF.
4. Place the bleed hose of the fuel pressure gage into an approved gasoline container.
5. Open the bleed valve on the fuel pressure gage in order to bleed the air from the fuel pressure gage.
6. Command the fuel pump ON with a scan tool.
7. Close the bleed valve on the fuel pressure gage.
8. Command the fuel pump ON with a scan tool.
9. Inspect for fuel leaks.

1. Place the fuel pressure gage bleed hose into an approved container and open the bleed valve in order to bleed OFF fuel system pressure.
2. Place a shop towel under the J 34730-1A to catch any remaining fuel spillage.
3. Remove the J 34730-1A from the fuel pressure connection.
4. Drain any fuel remaining in the fuel pressure gage into an approved container.
5. Inspect for leaks using the following procedure: Turn ON the ignition, with the engine OFF for 2 seconds. Turn OFF the ignition, for 10 seconds. Turn ON the ignition, with the engine OFF. Inspect for fuel leaks.
6. Install the cap on the fuel pressure connection.
7. Install the fuel injection sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical.

J 44581 Fuel Line Disconnect Tool

1. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief Procedure»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
2. Remove the retainer from the quick-connect fitting, if equipped.
3. Blow dirt out of the fitting using compressed air.
4. Choose the correct end of the tool for the size of the fitting. Insert the J 44581 tool into the female connector, then push inward to release the locking tabs.
5. Pull the connection apart.
6. Using a clean shop towel, wipe off the male pipe end.
7. Inspect both ends of the fitting for dirt and burrs. Clean or replace the components as required.

1. Apply a few drops of clean engine oil to the male pipe end.
2. Push both sides of the fitting together to cause the retaining tabs to snap into place.
3. Once installed, pull on both sides of the fitting to make sure the connection is secure.
4. Install the retainer to the quick-connect fitting.

1. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief Procedure»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
2. Blow dirt out of the fitting using compressed air.
3. Squeeze the plastic tabs of the male end connector.
4. Pull the connection apart.
5. Wipe off the male pipe end using a clean shop towel.
6. Inspect both ends of the fitting for dirt and burrs.
7. Clean or replace the components as required.

1. Apply a few drops of clean engine oil to the male pipe end.
2. Push both sides of the quick-connect fitting together in order to cause the retaining tabs/fingers to snap into place.
3. Pull on both sides of the quick connect fitting in order to make sure the connection is secure.

1. Remove the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical.
2. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
3. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief Procedure»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
4. Raise the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/i-2002-2007/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
5. Disconnect the quick-connect fittings (3 and 4) at the fuel filter inlet. Refer to «Quick Connect Fitting(s) Service (Metal Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
6. Disconnect the threaded fitting (1) at the fuel filter outlet.
7. Drain any remaining fuel into an approved gasoline container.
8. Remove the fuel filter (2).
9. Remove the fuel pipe O-ring.
10. Discard the fuel filter into an approved container.

1. Remove the protective caps from the new fuel filter.
2. Lubricate the new fuel pipe O-ring with clean engine oil.
3. Install the fuel pipe O-ring.
4. Slide the fuel filter into place.
5. Connect the quick-connect fittings (3 and 4) to the inlet side of the filter. Refer to «Quick Connect Fitting(s) Service (Metal Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
6. Connect the threaded fitting to the fuel filter outlet. Use a back-up wrench in order to prevent the fuel filter from turning. Tighten: Tighten the fuel filter outlet fitting to 30 N.m (22 lb ft).
7. Lower the vehicle.
8. Ensure that the fuel tank filler cap is installed correctly.
9. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
10. Perform the following procedure in order to inspect for leaks: Turn ON the ignition, with the engine OFF for 2 seconds. Turn OFF the ignition for 10 seconds. Turn ON the ignition, with the engine OFF. Inspect for fuel leaks.
11. Install the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical.

1. J 36850 Transjel Lubricant
2. J 42960-2 Fuel Flapper Door Holder
3. J 45004 Fuel Drain Hose

1. Remove the fuel filler cap.
2. Install the J 42960-2 into the fuel fill pipe in order to hold the door open.
3. Insert the J 45004 into the fuel tank until the hose reaches the bottom of the fuel tank.
4. Use an air operated pump device in order to drain the fuel into an approved gasoline container. Up to 26 liters (7 gallons) of residual fuel may remain in the secondary side of the fuel tank.
5. Simultaneously twist and pull in order to remove the J 45004 from the fuel tank.

1. Drain the fuel tank. Refer to «Fuel Tank Draining Procedure»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-26l-32l-introduction) .
2. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief Procedure»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
3. Remove the exhaust system. Refer to «Exhaust System Replacement (LA3, LY9)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-system-replacement-la3-ly9) , «Exhaust System Replacement (LY7)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system) or «Exhaust System Replacement (LS6)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-system-replacement-ls6) in Engine Exhaust.
4. Remove the propeller shaft. Refer to «Propeller Shaft Replacement (Automatic Transmission)»(/cadillac/cts/i-2002-2007/remont/driveshaft-universal-joints/#propeller-shaft) , «Propeller Shaft Replacement (Manual Transmission)»(/cadillac/cts/i-2002-2007/remont/driveshaft-universal-joints/#propeller-shaft) or «Propeller Shaft Replacement (CTS-V)»(/cadillac/cts/i-2002-2007/remont/driveshaft-universal-joints/#propeller-shaft) in Propeller Shaft.
5. Disconnect the filler hose (1) from the fuel tank.
6. Disconnect the filler vent tube (2) from the evaporative emission (EVAP) hose. Refer to «Quick Connect Fitting(s) Service (Plastic Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
7. Refer to «Quick Connect Fitting(s) Service (Metal Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) or «Quick Connect Fitting(s) Service (Plastic Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) in order to disconnect the following from the chassis bundle: The fuel feed hoses (3 and 4) The fuel EVAP hose
8. Disconnect the fuel tank electrical connector.
9. Disconnect the EVAP hoses from the EVAP canister.
10. Pull outward on the retainer tab in order to disengage the retainer from the chassis.
11. Disconnect the electrical connector from the EVAP canister.
12. Raise the lower control arms using a suitable screw jack (3) in order to remove the load from the lower shock bolts (2).
13. Remove the lower shock bolts (2).
14. Remove the screw jack (3).
15. Position the screw jack under the rear frame near the adjuster tie bar, in order to support the front of the rear frame.
16. Remove the 2 front bolts from the rear frame.
17. Lower the screw jack until there is approximately 50 mm (2 in) (a) between the front mounting surface of the rear frame and the chassis. This will allow clearance to access the fuel tank strap bolts.
18. Remove the fuel tank strap bolts.
19. Position the fuel tank straps downward around the rear frame.
20. Carefully bend the fuel tank straps ONLY enough to allow the fuel tank to be removed.
21. With the aid of an assistant, carefully lower the fuel tank from the vehicle.
22. Remove the following components if replacing just the fuel tank: The primary fuel tank module-Refer to «Fuel Tank Module Replacement - Primary»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) . The secondary fuel tank module-Refer to «Fuel Tank Module Replacement - Secondary»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) . The fuel tank pressure sensor-Refer to «Fuel Tank Pressure Sensor Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .

1. Install the following components if fuel tank replacement was necessary: The primary fuel tank module-Refer to «Fuel Tank Module Replacement - Primary»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) . The secondary fuel tank module-Refer to «Fuel Tank Module Replacement - Secondary»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) . The fuel tank pressure sensor-Refer to «Fuel Tank Pressure Sensor Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
2. With the aid of an assistant, carefully raise the fuel tank to the vehicle, aligning the filler neck with the filler hose.
3. Carefully bend the fuel tank straps back to their original form.
4. Position the fuel tank straps around the rear frame and upward into position, aligning the holes in the straps with the threaded holes in the chassis.
5. Install the fuel tank strap bolts. Tighten: Tighten the fuel tank strap bolts to 50 N.m (37 lb ft).
6. Connect the filler hose (1) to the fuel tank. Tighten: Tighten the fuel filler tube hose clamp (3) to 3.5 N.m (31 lb in).
7. Connect the filler vent tube (2) to the EVAP hose. Refer to «Quick Connect Fitting(s) Service (Plastic Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
8. Connect the EVAP hoses to the EVAP canister.
9. Insert the retainer into the chassis and press inward on the tab to engage.
10. Connect the electrical connector to the EVAP canister.
11. Connect the fuel tank electrical connector.
12. Refer to «Quick Connect Fitting(s) Service (Metal Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) or «Quick Connect Fitting(s) Service (Plastic Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) in order to connect the following to the chassis bundle: The fuel feed hoses (3 and 4) The fuel EVAP hose
13. Raise the rear frame using the screw jack.
14. Install the 2 front bolts to the rear frame. Tighten: Tighten the rear frame bolts to 265 N.m (195 lb ft).
15. Remove the screw jack.
16. Position the screw jack (3) under the lower control arm in order to raise the lower control arms (2).
17. Install the lower shock bolts (2). Tighten: Tighten the lower shock bolts to 150 N.m (111 lb ft).
18. Remove the screw jack (3).
19. Install the propeller shaft. Refer to «Propeller Shaft Replacement (Automatic Transmission)»(/cadillac/cts/i-2002-2007/remont/driveshaft-universal-joints/#propeller-shaft) , «Propeller Shaft Replacement (Manual Transmission)»(/cadillac/cts/i-2002-2007/remont/driveshaft-universal-joints/#propeller-shaft) or «Propeller Shaft Replacement (CTS-V)»(/cadillac/cts/i-2002-2007/remont/driveshaft-universal-joints/#propeller-shaft) in Propeller Shaft.
20. Install the exhaust system. Refer to «Exhaust System Replacement (LA3, LY9)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-system-replacement-la3-ly9) , «Exhaust System Replacement (LY7)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system) or «Exhaust System Replacement (LS6)»(/cadillac/cts/i-2002-2007/remont/exhaust/#engine-exhaust-system__exhaust-system-replacement-ls6) in Engine Exhaust.
21. Refill the fuel tank.
22. Inspect for fuel leaks.

1. Remove the fuel tank. Refer to «Fuel Tank Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
2. Disconnect the electrical connector from the fuel tank pressure sensor.
3. Open the retaining strap.
4. Carefully pry the locking tabs away from the pressure sensor.
5. Pull upward in order to remove the pressure sensor from the fuel tank.

1. Press the fuel tank pressure sensor into the fuel tank, until the locking tabs are fully seated.
2. Close the retaining strap.
3. Connect the electrical connector to the fuel tank pressure sensor.
4. Install the fuel tank. Refer to «Fuel Tank Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .

1. Remove the fuel filler cap.
2. Drain the fuel tank below the level of the fuel filler hose. Refer to «Fuel Tank Draining Procedure»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-26l-32l-introduction) .
3. Remove the bolts securing the fuel filler tube to the body.
4. Remove the right rear wheel. Refer to «Tire and Wheel Removal and Installation»(/cadillac/cts/i-2002-2007/remont/wheel-tire-system/#tires-and-wheels) in Tires and Wheels.
5. Remove the right rear wheelhouse liner.
6. Remove the fuel filler tube brace bolt.
7. Disconnect the fuel filler hose (1) from the fuel tank.
8. Disconnect the filler vent tube (2) from the evaporative emission (EVAP) hose. Refer to «Quick Connect Fitting(s) Service (Plastic Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
9. Remove the fuel filler tube from the vehicle.

1. Position the fuel filler tube to the vehicle.
2. Connect the filler hose (1) to the fuel tank. Tighten: Tighten the fuel filler tube hose clamp (3) to 3.5 N.m (31 lb in).
3. Connect the filler vent tube (2) to the EVAP hose. Refer to «Quick Connect Fitting(s) Service (Plastic Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
4. Install the fuel filler tube brace bolt. Tighten: Tighten the fuel filler tube brace bolt to 9 N.m (80 lb in).
5. Install the bolts securing the fuel filler tube to the body. Tighten: Tighten the fuel filler tube bolts to 3.5 N.m (31 lb in).
6. Install the right rear wheelhouse liner.
7. Install the right rear wheel. Refer to «Tire and Wheel Removal and Installation»(/cadillac/cts/i-2002-2007/remont/wheel-tire-system/#tires-and-wheels) in Tires and Wheels.
8. Add fuel to the fuel tank.
9. Inspect for fuel leaks.
10. Install the fuel filler cap.

J 45747 Fuel Tank Sender Wrench

Scheme 91

1. Remove the fuel tank. Refer to «Fuel Tank Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
2. Remove the fuel tank hoses. Refer to «Quick Connect Fitting(s) Service (Plastic Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
3. Disconnect the electrical connector from the primary fuel tank module.
4. Rotate the cam lock ring counter-clockwise using the J 45747 .
5. Remove the cam lock ring from the fuel tank.
6. Carefully lift the primary fuel tank module (1) from the fuel tank only enough to access the transfer tube (2).
7. Complete the following in order to disconnect the transfer tube from the primary fuel tank module: Pull the locking mechanism away from the module. Remove the transfer tube from the module.
8. Remove the primary fuel tank module from the fuel tank.
9. Remove the primary fuel tank module seal from the module. Do not reuse the seal.

1. Place the new primary fuel tank module seal (1) over the module (2).
2. Complete the following in order to connect the transfer tube (2) to the primary fuel tank module (1). Grasp the transfer tube (2) from inside the fuel tank. Position the module (1) near the module opening. Connect the transfer tube (2) to the module (1).
3. Carefully insert the primary fuel tank module (1) into the fuel tank.
4. Press the primary fuel tank module (1) downward, aligning the module to the encapsulated ring.
5. Position the cam lock ring to the fuel tank.
6. Rotate the cam lock ring clockwise using the J 45747 until fully seated.
7. Connect the electrical connector to the primary fuel tank module.
8. Install the fuel tank hoses. Refer to «Quick Connect Fitting(s) Service (Plastic Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
9. Install the fuel tank. Refer to «Fuel Tank Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .

J 45747 Fuel Tank Sender Wrench

1. Remove the fuel tank. Refer to «Fuel Tank Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
2. Disconnect the electrical connector from the secondary fuel tank module.
3. Rotate the cam lock ring counter-clockwise using the J 45747 .
4. Remove the cam lock ring from the fuel tank.
5. Carefully lift the secondary fuel tank module (2) from the fuel tank only enough to access the transfer tube (1).
6. Complete the following in order to disconnect the transfer tube from the secondary fuel tank module. Pull the locking mechanism away from the module. Remove the transfer tube from the module.
7. Remove the secondary fuel tank module from the fuel tank.
8. Remove the secondary fuel tank module seal from the module. Do not reuse the seal.

1. Place the new secondary fuel tank module seal (1) over the module (2).
2. Complete the following in order to connect the transfer tube (1) to the secondary fuel tank module (2). Grasp the transfer tube (1) from inside the fuel tank. Position the module (2) near the module opening. Connect the transfer tube (1) to the module (2).
3. Carefully insert the secondary fuel tank module (2) into the fuel tank.
4. Press the secondary fuel tank module (2) downward, aligning the module to the encapsulated ring.
5. Position the cam lock ring to the fuel tank.
6. Rotate the cam lock ring clockwise using the J 45747 until fully seated.
7. Connect the electrical connector to the secondary fuel tank module.
8. Install the fuel tank. Refer to «Fuel Tank Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .

1. Remove the primary fuel tank module. Refer to «Fuel Tank Module Replacement - Primary»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
2. Disconnect the fuel level sensor electrical connector (1) from the module.
3. Complete the following in order to remove the fuel level sensor (1) from the module assembly: Pull the locking tab (2) away from the sensor (1). Slide the sensor (1) away from the module assembly.

1. Complete the following in order to install the fuel level sensor (1) to the module assembly: Align the tabs of the sensor (1) with the slots in the module assembly. Slide the sensor (1) fully into position, ensure the locking tab (2) is engaged.
2. Connect the fuel level sensor electrical connector (1) to the module.
3. Install the primary fuel tank module. Refer to «Fuel Tank Module Replacement - Primary»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .

1. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
2. Remove the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical - 5.7L.
3. Relieve the fuel system pressure. Refer to the «Fuel Pressure Relief Procedure»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
4. Disconnect the quick-connect fitting at the chassis fuel pipe (3). Refer to «Quick Connect Fitting(s) Service (Metal Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
5. Remove the retaining nut (5) from the engine compartment fuel line bracket.
6. Disconnect the quick-connect fitting at the fuel rail (6). Refer to «Quick Connect Fitting(s) Service (Metal Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
7. Cap the pipes in order to prevent possible fuel system contamination.
8. Remove the retaining nut from the fuel line bracket stud (5).
9. Remove the engine compartment fuel pipe from the vehicle.

1. Remove the caps from the pipes.
2. Install the fuel pipe to the vehicle.
3. Connect the engine compartment pipe to the fuel rail. Refer to «Quick Connect Fitting(s) Service (Metal Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
4. Install the fuel line bracket nut to the stud (5). Tighten: Tighten the engine compartment fuel line nut to 10 N.m (89 lb in).
5. Install the fuel line bracket to the stud.
6. Install the fuel line bracket nut to the stud (5). Tighten: Tighten the engine compartment fuel line nut to 10 N.m (89 lb in).
7. Connect the quick-connect fitting at the chassis fuel pipe (3). Refer to «Quick Connect Fitting(s) Service (Metal Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
8. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
9. Perform the following procedure in order to inspect for leaks: Turn the ignition switch ON for 2 seconds. Turn the ignition switch OFF for 10 seconds. Turn the ignition switch ON. Inspect for fuel leaks.
10. Install the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical - 5.7L.

The fuel system hose/pipes are serviceable individually or as a complete fuel/brake bundle assembly, the following procedure is servicing the fuel hose/pipes individually.

1. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief Procedure»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
2. Disconnect the feed hose/pipe (3) from the engine compartment line connection. Refer to «Quick Connect Fitting(s) Service (Metal Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
3. Plug the open ports to prevent fuel loss and contamination.
4. Disconnect the evaporative emission (EVAP) hose from the engine compartment line connection (2). Refer to «Quick Connect Fitting(s) Service (Plastic Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
5. Remove the lines from the engine compartment retainer (1).
6. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/i-2002-2007/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
7. Refer to «Quick Connect Fitting(s) Service (Plastic Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) and «Quick Connect Fitting(s) Service (Metal Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) in order to disconnect the following quick connect fittings from the chassis bundle: The fuel filter (2) The fuel hose The fuel EVAP hose Plug the open outlet ports to prevent fuel loss and contamination.
8. Pull the locking mechanism (1) outward in order to disengage the fuel/brake bundle chassis pipe retainers from the rail.
9. Open the retainers (1) located at the forward portion of the rail in order to remove the chassis hose/pipes.
10. Complete the following in order to remove the chassis hose/pipes from the retainers (2) located at the rearward portion of the rail: Pull the retainers (2) free from the rail. Open the retainers (2) at the top. Remove the chassis hose/pipes from the retainers (2).
11. Pull downward in order to disconnect the fuel/brake bundle chassis pipe retainer from the underbody.
12. Remove the bolt securing the fuel filter bracket to the body.
13. Remove the bolts securing the transmission support to the underbody, from the right side only.
14. Pull the right side transmission support down only enough to allow removal of the chassis fuel hose/pipes.
15. Partially lower the hoist only enough to simultaneously gain access to both the front and rear portions of the chassis fuel hose/pipes.
16. With the aid of an assistant, carefully guide the chassis fuel hose/pipes down through the engine compartment, removing from the bottom.

1. Clean any of the contamination from the male line ends and apply a few drops of clean engine oil.
2. With the aid of an assistant, carefully guide the chassis fuel hose/pipes up through the engine compartment into position.
3. Pull the right side transmission support down only enough to allow installation of the chassis fuel hose/pipes.
4. Install the bolts securing the transmission support to the underbody. Refer to «Transmission Support Replacement»(/cadillac/cts/i-2002-2007/remont/frames-subframes-crossmembers/#frame-and-underbody) in Frame and Underbody.
5. Install the bolt securing the fuel filter bracket to the body. Tighten: Tighten the fuel filter bracket bolt to 9 N.m (80 lb in).
6. Push upward in order to connect the fuel/brake bundle chassis pipe retainer to the underbody.
7. Complete the following in order to install the chassis hose/pipes to the retainers (2) located at the rearward portion of the rail: Install the chassis hose/pipes into the retainers (2). Close the retainers (2) at the top. Insert the retainers (2) into the rail.
8. Install the chassis hose/pipes into the retainers (1) located at the forward portion of the rail.
9. Close the retainers.
10. Push the locking mechanism (1) inward in order to engage the fuel/brake bundle chassis pipe retainers to the rail.
11. Refer to «Quick Connect Fitting(s) Service (Metal Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) and «Quick Connect Fitting(s) Service (Plastic Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) in order to connect the following quick connect fittings to the chassis bundle: The fuel filter (2) The fuel hose The fuel EVAP hose
12. Lower the vehicle.
13. Insert the chassis hose/pipes into the retainers (1).
14. Close the retainer.
15. Connect the EVAP quick connect fitting (2). Refer to «Quick Connect Fitting(s) Service (Plastic Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
16. Connect the fuel feed pipe (3) to the engine compartment line connection. Refer to «Quick Connect Fitting(s) Service (Metal Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
17. Check the fuel system for leaks.
18. Install the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical - 5.7L.

Fuel System Cleaning

The following procedure covers the disassembly and the inspection of the complete fuel supply system. If the fuel system is contaminated, the fuel system can be cleaned. You can usually determine the extent of the fuel system contamination during the disassembly.

1. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief Procedure»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
2. Remove the in-line fuel filter. Refer to «Fuel Filter Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
3. Inspect the fuel system for contamination of the in-line fuel filter. Replace the filter after cleaning the fuel lines if the filter is plugged or contaminated.
4. Remove the fuel module assemblies. Refer to «Fuel Tank Module Replacement - Primary»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) and «Fuel Tank Module Replacement - Secondary»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
5. Locate the tank in a suitable work area away from any heat, any flame, or any other source of ignition.
6. Perform the following procedures: Inspect the fuel sender strainer. Replace the primary fuel tank module if the strainer is contaminated. Inspect the secondary fuel tank module for debris. Clean the secondary fuel tank module if debris is found. CAUTION: Wear safety glasses when using compressed air, as flying dirt particles may cause eye injury. Use compressed air in order to apply air pressure to the transfer tube.
7. Flush the fuel tank with running hot water for at least five minutes. Pour the water out of the fuel sender assembly opening. Rock the tank in order to ensure that the removal of the water from the tank is complete.
8. Disconnect the fuel feed hose/pipe from the fuel rail. Refer to «Fuel Rail Assembly Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
9. Use compressed air in order to apply air pressure to the fuel lines in the opposite direction from the normal fuel flow.
10. Remove the fuel injectors and fuel rail. Refer to «Fuel Injector Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) and «Fuel Rail Assembly Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
11. Clean and inspect the fuel injectors and fuel rail.

Assemble the fuel system as follows

1. Install the fuel injectors and fuel rail. Refer to «Fuel Injector Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) and «Fuel Rail Assembly Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
2. Install the fuel module assemblies. Refer to «Fuel Tank Module Replacement - Primary»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) and «Fuel Tank Module Replacement - Secondary»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
3. Install the fuel filter. Refer to «Fuel Filter Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
4. Connect the fuel line to the fuel rail. Refer to «Quick Connect Fitting(s) Service (Metal Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .

1. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
2. Remove the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical - 5.7L.
3. Relieve the fuel system pressure. Refer to the «Fuel Pressure Relief Procedure»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
4. Clean the fuel rail assembly with a spray type engine cleaner, GM X-30A or equivalent, if necessary. Follow the package instructions. Do not soak the fuel rail in liquid cleaning solvent.
5. Remove the engine compartment fuel line (3). Refer to «Fuel Hose/Pipes Replacement - Engine Compartment»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
6. Disconnect the engine compartment evaporative emission (EVAP) line (1) from the chassis EVAP line. Refer to «Quick Connect Fitting(s) Service (Plastic Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
7. Disconnect the engine compartment EVAP line from the purge valve. Refer to «Quick Connect Fitting(s) Service (Plastic Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
8. Remove the EVAP line from the vehicle.
9. Disconnect the fuel injector electrical connectors. Identify the connectors to their corresponding injectors in order to ensure the correct sequential injector firing order after reassembly.
10. Remove the fuel injector wiring harness retainers from the fuel rail.
11. Note the location of the fuel rail ground strap (1) on the intake manifold. The fuel rail ground strap must be installed during assembly.
12. Remove the fuel rail attaching bolts.
13. Remove the fuel rail assembly.
14. Remove the fuel injectors, if necessary. Refer to «Fuel Injector Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
15. Remove the injector lower O-ring seal from the spray tip end of each injector.
16. Discard the lower O-ring seals.

Scheme 92

1. If previously removed, install the fuel injectors. Refer to «Fuel Injector Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
2. Note the location of the fuel rail ground strap (1) on the intake manifold. The fuel rail ground strap must be installed during assembly.
3. Lubricate the new lower injector O-ring seals with clean engine oil.
4. Install the new O-ring seals on the spray tip end of each injector.
5. Install the fuel rail assembly to the intake manifold.
6. Apply a 5 mm (0.02 in) band of GM P/N 12345382 (Canadian P/N 10953489) threadlock or equivalent to the threads of the fuel rail bolts.
7. Install the fuel rail attaching bolts. Tighten: Tighten the fuel rail attaching bolts to 10 N.m (89 lb in).
8. Install the fuel injector wire harness retainers to the fuel rail.
9. Connect the injector electrical connectors. Install each connector on the proper injector in order to ensure the correct sequential injector firing order. Rotate the injectors as required in order to avoid stretching the injector wiring harness.
10. Install the EVAP line to the vehicle.
11. Connect the EVAP line to the EVAP valve. Refer to «Quick Connect Fitting(s) Service (Plastic Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
12. Connect the EVAP line to the chassis EVAP line (1). Refer to «Quick Connect Fitting(s) Service (Plastic Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
13. Install the engine compartment fuel pipe (3). Refer to «Fuel Hose/Pipes Replacement - Engine Compartment»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
14. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
15. Perform the following procedure in order to inspect for leaks: Turn the ignition switch ON for 2 seconds. Turn the ignition switch OFF for 10 seconds. Turn the ignition switch ON. Inspect for fuel leaks.
16. Install the fuel injector sight shield.

Fuel Injector Cleaning Procedure

Tools Required

1. J 37287 Fuel Line Shut-Off Adapter
2. J 38500-A Fuel Injector Cleaner. See «Special Tools and Equipment»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .

1. Obtain J 38500-A (2). See «Special Tools and Equipment»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
2. For US dealers, empty 2 pre-measured GM Top-Engine Cleaner containers, 24 ml (0.812 oz) each, GM P/N 12346535, into the J 38500-A . See «Special Tools and Equipment»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
3. For Canadian dealers, measure and dispense 48 ml (1.62 oz) of Top-Engine Cleaner, Canadian P/N 992872, into the J 38500-A . See «Special Tools and Equipment»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
4. If you are using any other brand of tank you will need a total of 96 ml (3.24 oz) of Top-Engine Cleaner mixed with 864 ml (29.16 oz) of regular unleaded gasoline.
5. Fill the injector cleaning tank with regular unleaded gasoline. Be sure to follow all additional instructions provided with the tool.
6. Electrically disable the vehicle fuel pump by removing the fuel pump relay and disconnecting the oil pressure switch connector, if equipped.
7. Relieve the fuel system pressure. Refer to «Fuel Pressure Relief Procedure»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
8. Disconnect the fuel feed line (3) at the fuel rail. Refer to «Fuel Hose/Pipes Replacement - Engine Compartment»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) . Install the J 37287 to the fuel system. Ensure that the valve is in the closed position.
9. Connect the J 38500-A to the vehicle's fuel rail. See «Special Tools and Equipment»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
10. Pressurize the J 38500-A to 510 kPa (75 psi). See «Special Tools and Equipment»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
11. Start and idle the engine until it stalls, due to lack of fuel. This should take approximately 15-20 minutes.
12. Disconnect J 38500-A from the fuel rail. See «Special Tools and Equipment»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
13. Reconnect the vehicle's fuel pump relay and oil pressure switch connector, if equipped.
14. Remove J 37287 and reconnect the vehicles fuel feed line.
15. Start and idle the vehicle for an additional 2 minutes to ensure residual injector cleaner is flushed from the fuel rail and fuel lines.
16. Repeat steps 1-5 of the Injector Balance Test, and record the fuel pressure drop from each injector.
17. Subtract the lowest fuel pressure drop from the highest fuel pressure drop. If the value is 15 kPa (2 psi) or less, no additional action is required. If the value is greater than 15 kPa (2 psi), replace the injector with the lowest fuel pressure drop.
18. Add one ounce of Port Fuel Injector Cleaner, GM P/N 12345104 (Canadian P/N 10953467), to the vehicles fuel tank for each gallon of gasoline estimated to be in the fuel tank. Instruct the customer to add the reminder of the bottle of Port Fuel Injector Cleaner to the vehicle fuel tank at the next fill-up.
19. Advise the customer to change brands of fuel and to add GM Port Fuel Injector Cleaner every 5 000 km (3,000 mi). GM Port Fuel Injector Cleaner contains the same additives that the fuel companies are removing from the fuel to reduce costs. Regular use of GM Port Fuel Injector Cleaner should keep the customer from having to repeat the injector cleaning procedure.
20. Road test the vehicle to verify that the customer concern has been corrected.

1. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
2. Relieve the fuel system pressure. Refer to the «Fuel Pressure Relief Procedure»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
3. Remove the fuel rail assembly. Refer to «Fuel Rail Assembly Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
4. Spread the injector retainer clip to release the injector from the fuel rail.
5. Remove the fuel injector.
6. Remove the injector O-ring seals from both ends of the injector.

1. The fuel injector assembly is stamped with a part number identification (2), a manufacturing date (3), a week code (1), and a production plant number (4). Inspect the new injectors in order to ensure installation of the correct part.
2. Lubricate the new injector O-ring seals with clean engine oil.
3. Install the new injector O-ring seals on the injector.
4. Install a new retainer clip on the injector.
5. Push the fuel injector into the fuel rail injector socket with the electrical connector facing outward.
6. Install the fuel rail assembly. Refer to «Fuel Rail Assembly Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
7. Tighten the fuel filler cap.
8. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
9. Inspect for leaks. Turn the ignition switch ON for 2 seconds. Turn the ignition switch OFF for 10 seconds. Turn the ignition switch ON. Inspect for fuel leaks.

1. Remove the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical - 5.7L.
2. Disconnect the engine vacuum pipe from the evaporative emission (EVAP) canister purge solenoid valve to intake manifold EVAP pipe. Refer to «Quick Connect Fitting(s) Service (Plastic Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
3. Disconnect the engine purge pipe from the EVAP canister purge valve. Refer to «Quick Connect Fitting(s) Service (Plastic Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
4. Remove the fuel injector wire harness retainers from the fuel rail and position aside.
5. Disconnect the EVAP canister purge valve harness connector.
6. Remove the EVAP canister purge valve from the purge bracket.

1. Install the EVAP canister purge valve to the purge bracket.
2. Connect the harness connector to the EVAP canister purge valve.
3. Connect the fuel injector wire harness retainers to the fuel rail.
4. Connect the engine purge pipe to the chassis purge pipe. Refer to «Quick Connect Fitting(s) Service (Plastic Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
5. Connect the engine vacuum pipe to the EVAP canister purge valve. Refer to «Quick Connect Fitting(s) Service (Plastic Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
6. Install the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical - 5.7L.

1. Remove the evaporative emission (EVAP) canister. Refer to «Evaporative Emission (EVAP) Canister Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-26l-32l-introduction) .
2. Clean away any debris that may be present around the EVAP canister vent valve.
3. Twist the EVAP canister vent valve counterclockwise.
4. Pull the EVAP canister vent valve from the EVAP canister.

1. Insert the EVAP canister vent valve into the EVAP canister.
2. Twist the EVAP canister vent valve clockwise into the locked position.
3. Install the EVAP canister. Refer to «Evaporative Emission (EVAP) Canister Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-26l-32l-introduction) .

Note. Do not attempt to straighten kinked nylon pipes. Replace any kinked nylon pipes in order to prevent damage to the vehicle. Do not attempt to repair sections of nylon pipes. Replace damaged nylon pipes. Replace the vapor hoses/pipes with original equipment or parts that meet GM specifications.

1. Remove the fuel tank. Refer to «Fuel Tank Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
2. Remove the chassis to canister evaporative emission (EVAP) hose from the following: The body retainer (1) The 3 retaining features (2) on the fuel tank The retainer clip (3)
3. Remove the EVAP hose from the fuel tank.

1. Position the EVAP hose to the fuel tank.
2. Install the chassis to canister evaporative emission (EVAP) hose to the following: The body retainer (1) The 3 retaining features (2) on the fuel tank The retainer clip (3)
3. Install the fuel tank. Refer to «Fuel Tank Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .

1. Remove the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical - 5.7L.
2. Disconnect the vacuum supply line quick-connect fittings at the intake manifold and the evaporative emission (EVAP) canister purge valve. Refer to «Quick Connect Fitting(s) Service (Plastic Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
3. Remove the vacuum supply EVAP pipe.
4. Cap the intake manifold pipe and the EVAP canister purge valve in order to prevent possible contamination.
5. Disconnect the EVAP engine purge pipe from the line connection (2) at the right rear cylinder head. Refer to «Quick Connect Fitting(s) Service (Plastic Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
6. Disconnect the left bank coil electrical connection to gain access to the EVAP purge valve.
7. Disconnect the EVAP pipe from the purge valve. Refer to «Quick Connect Fitting(s) Service (Plastic Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
8. Remove the EVAP engine purge pipe from under the fuel rail.

1. Install the engine purge pipe under the fuel rail.
2. Connect the EVAP pipe to the purge valve. Refer to «Quick Connect Fitting(s) Service (Plastic Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
3. Connect the left bank coil electrical connector.
4. Connect the EVAP engine purge pipe to the line connection (2) at the right rear cylinder head. Refer to «Quick Connect Fitting(s) Service (Plastic Collar)»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
5. Remove the caps from the intake manifold pipe and the EVAP canister purge valve.
6. Install the EVAP pipe to the intake manifold and the EVAP canister purge valve.
7. Install the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical - 5.7L.

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/i-2002-2007/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
2. Using a 90 degree pick, disengage the lower filter cover clips.
3. Insert a flat-bladed tool between the filter cover and canister, and push up to disengage the upper clips.
4. Remove and discard the evaporative emission (EVAP) canister filter cover.
5. Remove and discard the EVAP canister filter.
6. Clean the inside of the EVAP canister filter housing with a clean shop towel.

1. Insert a NEW EVAP canister filter into the EVAP canister.
2. Install a NEW EVAP canister filter cover seal to a EVAP NEW canister cover.
3. Snap the EVAP canister filter cover onto the EVAP canister.
4. Lower the vehicle.

1. Remove the rear frame. Refer to «Frame Replacement - Rear»(/cadillac/cts/i-2002-2007/remont/frames-subframes-crossmembers/#frame-and-underbody) in Frame and Underbody.
2. Disconnect the evaporative emission (EVAP) hoses from the EVAP canister.
3. Disconnect the electrical connector from the EVAP canister.
4. Remove the EVAP canister retaining nuts.
5. Complete the following in order to remove the EVAP canister: Lower the rear of the canister enough to clear the 2 weld studs. Slide the canister rearward from the body brace.

1. Complete the following in order to install the EVAP canister: Insert the fresh air tube and tab on the canister forward into the body brace. Rotate the rear of the canister up over the 2 weld studs on the floor pan.
2. Install the EVAP canister retaining nuts. Tighten: Tighten the EVAP canister retaining nuts to 6 N.m (53 lb in).
3. Connect the EVAP hoses to the EVAP canister.
4. Connect the electrical connector to the EVAP canister.
5. Install the rear frame. Refer to «Frame Replacement - Rear»(/cadillac/cts/i-2002-2007/remont/frames-subframes-crossmembers/#frame-and-underbody) in Frame and Underbody.

1. Disconnect the negative battery cable (2). Refer to «Battery Negative Cable Disconnect/Connect Procedure»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
2. Remove the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical - 5.7L.
3. If replacing an individual coil, disconnect the wire harness at the coil. If removing the coil assembly, disconnect the main coil harness connector.
4. Disconnect the spark plug wire at the ignition coils.
5. If replacing an individual coil, remove the ignition coil mounting bolts and/or nut that retains the coil to the coil bracket.
6. If removing the coil assembly, remove the bolts securing the coil bracket to the valve rocker arm cover.
7. Remove the ignition coil or coil assembly.

1. Install the ignition coil or coil assembly.
2. Install the ignition coil mounting bolts and/or nuts. Tighten Tighten the ignition coil-to-bracket bolts/nuts to 12 N.m (106 lb in). Tighten the ignition coil bracket-to-valve rocker arm cover bolts to bolts to 12 N.m (106 lb in).
3. Connect the spark plug wires at the ignition coils.
4. Connect the individual ignition coil or main coil harness connector.
5. Install the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical - 5.7L.
6. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.

Spark Plug Wire Inspection

Spark plug wire integrity is vital for proper engine operation. A thorough inspection will be necessary to accurately identify conditions that may affect engine operation. Inspect for the following conditions

1. Correct routing of the spark plug wires. Incorrect routing may cause cross-firing.
2. Any signs of cracks or splits in the wires.
3. Inspect each boot for the following conditions: Tearing Piercing Arcing Carbon tracking Corroded terminal

If corrosion, carbon tracking, or arcing are indicated on a spark plug wire boot or on a terminal, replace the wire and the component connected to the wire.

1. Disconnect the spark plug wires at each spark plug: Twist each spark plug boot 1/2 turn. Pull only on the boot in order to remove the wire from each spark plug.
2. Disconnect the spark plug wires from the ignition coil: Twist each spark plug boot 1/2 turn. Pull only on the boot in order to remove the wires from the ignition coil.

1. Install the spark plug wires at the ignition coil.
2. Install the spark plug wire to each spark plug.
3. Inspect the wires for proper installation: Push sideways on each boot in order to inspect the seating. Reinstall any loose boot.

Spark Plug Operation

Worn or dirty spark plugs may operate well at idle speeds, but frequently fail at higher load. Bad spark plugs are often responsible for the following conditions

1. Power loss
2. Poor fuel economy
3. Loss of speed
4. Hard starting
5. Poor engine performance

Normal spark plug operation results in brown to grayish tan deposits on the area of the spark plug that enters the cylinder. A small amount of reddish brown, yellow, and white powdery residue may also be present on the insulator tip around the center electrode. These deposits are normal combustion by-products of fuels and lubricating oils which contain additives.

Misfiring is a general term that applies to a poor running engine. With misfiring, the ignition spark is not igniting the air/fuel mixture at the proper time. While other possible causes must be investigated, the spark plugs should be inspected first. Spark voltage should not reach ground before jumping across the gap at the tip of the spark plug. This leaves the air/fuel mixture unburned, causing misfiring. Pre-ignition misfiring occurs when the spark plug tip overheats, igniting the mixture before the spark jumps.

Carbon fouling of the spark plug is indicated by dry carbon deposits on the portion of the spark plug inside of the cylinder. Excess idling and driving at slower speeds under light engine loads can keep the spark plug temperatures so low that these deposits are not burned off. Rich fuels or poor ignition system output may also cause carbon fouling.

Oil fouling of the spark plug appears as wet oily deposits on the portion of the spark plug inside of the cylinder. This may be caused by the following conditions

1. Oil getting past worn piston rings
2. Breaking in a new or recently overhauled engine

Deposit fouling of the spark plug occurs when the normal reddish brown, yellow, or white deposits of combustion by-products become sufficient enough to cause misfiring. In some cases, these deposits melt and form a shiny glaze on the insulator around the center electrode. If the fouling is found only in one or two of the cylinders, valve stem clearances or the intake valve seals may be allowing excess lubricating oil to enter the cylinder, particularly if the deposits are heavier on the intake valve side of the spark plug.

Excess gap means that the air space between the center and side electrodes at the bottom of the spark plug is too wide for consistent firing. This may be due to improper gap adjustment or to excess wear of the electrodes during use. A gap that is too small may cause idling instability. Excess gap wear might indicate vehicle operation at continual high speeds or with high engine loads. This causes the spark plugs to run too hot. Excessively lean fuel may also cause the wear.

Improper torque or seating can cause a spark plug to run hot, eventually leading to excess gap wear. In extreme cases, an overtightened or under-tightened spark plug can cause exhaust blow-by. The cylinder head seats must make good contact for sufficient heat transfer and spark plug cooling. Dirty or damaged threads in the head or on the spark plug can keep the spark plug from seating even though the proper torque is applied. Once the spark plugs are properly seated, tighten the spark plugs properly.

Cracked or broken insulators and insulator tips may be the result of improper installation or heat shock. Heat shock is a rapid increase in the insulator tip temperature which causes the insulator material to crack. The upper insulators can be broken when a poorly-fitting tool is used during servicing, or when the spark plug is hit from the outside. Cracks in the upper insulator may be inside the shell or invisible. The breakage may not cause problems until oil or water penetrates the crack later. Heat shock breakage in the lower insulator tip generally occurs during severe engine operating conditions such as higher RPM or heavy loading. Over advanced timing or low grade fuels may also cause heat shock breakage. Always replace spark plugs with broken or cracked insulators.

Damage during gapping can occur when the tool is pushed against the center electrode or the surrounding insulator, causing the insulator to crack. When gapping a spark plug, bend only the outside electrode. Keep tools free of any other parts.

Spark plugs with less than the recommended amount of service can sometimes be cleaned and regapped, then returned to service. If there is any doubt about the serviceability of a spark plug, replace the spark plug.

1. Remove the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical - 5.7L.
2. Remove the spark plug wires. Refer to «Spark Plug Wire Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
3. Loosen each spark plug 1 or 2 turns.
4. Brush or use compressed air to remove any dirt around the spark plugs.
5. Remove the spark plugs one at a time and place each plug in a tray marked with the corresponding cylinder numbers.

1. Inspect each spark plug gap. Adjust each plug as needed. Specification: Spark plug gap: 1.016 mm (0.040 in)
2. Hand start the spark plugs in the corresponding cylinders.
3. Tighten the spark plugs. Tighten: For cylinder head-new-Tighten the spark plugs to 20 N.m (15 lb ft). For cylinder head-all subsequent installations-Tighten the spark plugs to 15 N.m (11 lb ft).
4. Install the spark plug wires. Refer to «Spark Plug Wire Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
5. Install the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical - 5.7L.

1. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
2. Raise the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/cts/i-2002-2007/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) in General Information.
3. Remove the starter. Refer to «Starter Motor Replacement (LA3, LY9)»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) , «Starter Motor Replacement (LY7)»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) or «Starter Motor Replacement (LS6)»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
4. Disconnect the crankshaft position (CKP) sensor electrical connector.
5. Remove the CKP sensor retaining bolt.
6. Remove the CKP sensor.

1. Install the CKP sensor.
2. Install the CKP sensor retaining bolt. Tighten: Tighten the CKP sensor to 25 N.m (18 lb ft).
3. Connect the CKP sensor electrical connector.
4. Install the starter. Refer to «Starter Motor Replacement (LA3, LY9)»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) , «Starter Motor Replacement (LY7)»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) or «Starter Motor Replacement (LS6)»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
5. Lower the vehicle.
6. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.
7. Perform the CKP System Variation Learn Procedure. Refer to «CKP System Variation Learn Procedure»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction__ckp-system-variation-learn-procedure) .

1. Disconnect the negative battery cable.
2. Remove the intake manifold. Refer to «Intake Manifold Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical - 5.7L.
3. Remove the camshaft position (CMP) sensor electrical connector.
4. Remove the CMP sensor retaining bolt.
5. Remove the CMP sensor.

1. Install the CMP sensor.
2. Install the CMP sensor retaining bolt. Tighten: Tighten the CMP to 25 N.m (18 lb ft).
3. Connect the CMP sensor electrical connector.
4. Install the intake manifold. Refer to «Intake Manifold Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical - 5.7L
5. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.

1. Remove the intake manifold. Refer to «Intake Manifold Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical.
2. Remove the knock sensor wiring harness assembly.
3. Remove the knock sensor.

1. Install the knock sensor. Tighten: Tighten the knock sensor to 20 N.m (15 lb ft).
2. Install the knock sensor wiring harness assembly.
3. Install the intake manifold. Refer to «Intake Manifold Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical.
4. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnect/Connect Procedure»(/cadillac/cts/i-2002-2007/remont/charging-system/#battery-charging-system-and-starting-system) in Engine Electrical.

1. Loosen the screw clamps (1,2) and remove the air cleaner outlet duct from the vehicle. Refer to «Air Cleaner Outlet Duct Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
2. Remove the air cleaner housing cover screws (1).
3. Remove the air cleaner element.
4. Remove any loose debris that may be found laying in the base of the air cleaner housing.

1. Install the new air filter element.
2. Install the air cleaner housing cover.
3. Tighten the air cleaner housing cover screws (1). Tighten: Tighten the air cleaner housing cover screws to 3 N.m (27 lb in).
4. Install the air cleaner outlet duct and screw clamps (1,2). Refer to «Air Cleaner Outlet Duct Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .

1. Remove the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical - 5.7L.
2. Loosen the air cleaner outlet duct clamps (1, 2).
3. Partially remove the air cleaner outlet duct from the air cleaner housing to gain access to the mass air flow/intake air temperature (MAF/IAT) sensor electrical connector.
4. Disconnect the MAF/IAT sensor electrical connector (1).
5. Remove the air cleaner outlet duct assembly.
6. Remove the MAF/IAT if necessary. Loosen the MAF/IAT clamp (2).
7. Remove the MAF/IAT sensor from the air cleaner outlet duct. Note the position of the MAF/IAT sensor.

1. If previously removed, carefully install the MAF/IAT sensor to the air cleaner outlet duct. Ensure that sensor is clocked properly.
2. Tighten the MAF/IAT sensor clamp (2). Tighten: Tighten the clamp to 3 N.m (27 lb in).
3. Loosely install the air cleaner outlet duct assembly to the vehicle.
4. Connect the MAF/IAT sensor electrical connector.
5. Install the air cleaner outlet duct to the air cleaner housing.
6. Tighten the air cleaner outlet duct clamps (1, 2). Tighten: Tighten the screws to 3 N.m (27 lb in).
7. Install the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical - 5.7L.

1. Remove the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical - 5.7L.
2. Loosen the clamps (1,2) and remove the air cleaner outlet duct from the vehicle. Refer to «Air Cleaner Outlet Duct Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
3. Remove the screws (1) securing the air cleaner assembly to the vehicle and remove the assembly.

1. Install the air cleaner assembly into the vehicle.
2. Install the air cleaner assembly screws (1). Tighten: Tighten the air cleaner assembly screws to 10 N.m (89 lb in).
3. Install the air cleaner outlet duct and tighten the clamps (1,2). Refer to «Air Cleaner Outlet Duct Replacement»(/cadillac/cts/i-2002-2007/remont/testing-diagnostics/#engine-controls-57l-introduction) .
4. Install the fuel injector sight shield. Refer to «Fuel Injector Sight Shield Replacement»(/cadillac/cts/i-2002-2007/remont/mechanical/#engine-mechanical-57l-ls6) in Engine Mechanical - 5.7L.

Powertrain

The powertrain has electronic controls to reduce exhaust emissions while maintaining excellent driveability and fuel economy. The powertrain control module (PCM) is the control center of this system. The PCM monitors numerous engine and vehicle functions. The PCM constantly looks at the information from various sensors and other inputs, and controls the systems that affect vehicle performance and emissions. The PCM also performs the diagnostic tests on various parts of the system. The PCM can recognize operational problems and alert the driver via the malfunction indicator lamp (MIL). When the PCM detects a malfunction, the PCM stores a diagnostic trouble code (DTC). The problem area is identified by the particular DTC that is set. The control module supplies a buffered voltage to various sensors and switches. Review the components and wiring diagrams in order to determine which systems are controlled by the PCM.

The following are some of the functions that the PCM controls

1. The engine fueling
2. The ignition control (IC)
3. The knock sensor (KS) system
4. The evaporative emissions (EVAP) system
5. The secondary air injection (AIR) system (if equipped)
6. The exhaust gas recirculation (EGR) system
7. The automatic transmission functions
8. The generator
9. The A/C clutch control
10. The cooling fan control

Powertrain Control Module Function

The powertrain control module (PCM) constantly looks at the information from various sensors and other inputs and controls systems that affect vehicle performance and emissions. The PCM also performs diagnostic tests on various parts of the system. The PCM can recognize operational problems and alert the driver via the malfunction indicator lamp (MIL). When the PCM detects a malfunction, the PCM stores a diagnostic trouble code (DTC). The problem area is identified by the particular DTC that is set. The control module supplies a buffered voltage to various sensors and switches. The input and output devices in the PCM include analog-to-digital converters, signal buffers, counters, and output drivers. The output drivers are electronic switches that complete a ground or voltage circuit when turned on. Most PCM controlled components are operated via output drivers. The PCM monitors these driver circuits for proper operation and, in most cases, can set a DTC corresponding to the controlled device if a problem is detected.

Malfunction Indicator Lamp (MIL) Operation

The malfunction indicator lamp (MIL) is located in the instrument panel cluster. The MIL will display as either SERVICE ENGINE SOON or one of the following symbols when commanded ON

Scheme 93

Scheme 94

The MIL indicates that an emissions related fault has occurred and vehicle service is required.

The following is a list of the modes of operation for the MIL

1. The MIL illuminates when the ignition is turned ON, with the engine OFF. This is a bulb test to ensure the MIL is able to illuminate.
2. The MIL turns OFF after the engine is started if a diagnostic fault is not present.
3. The MIL remains illuminated after the engine is started if the control module detects a fault. A diagnostic trouble code (DTC) is stored any time the control module illuminates the MIL due to an emissions related fault. The MIL turns OFF after three consecutive ignition cycles in which a Test Passed has been reported for the diagnostic test that originally caused the MIL to illuminate.
4. The MIL flashes if the control module detects a misfire condition which could damage the catalytic converter.
5. When the MIL is illuminated and the engine stalls, the MIL will remain illuminated as long as the ignition is ON.
6. When the MIL is not illuminated and the engine stalls, the MIL will not illuminate until the ignition is cycled OFF and then ON.

Trip

A trip is an interval of time during which the diagnostic test runs. A trip may consist of only a key cycle to power up the powertrain control module (PCM), allow the diagnostic to run, then cycle the key off to power down the PCM. A trip may also involve a PCM power up, meeting specific conditions to run the diagnostic test, then powering down the PCM. The definition of a trip depends upon the diagnostic. Some diagnostic tests run only once per trip (i.e., catalyst monitor) while other tests run continuously during each trip (i.e., misfire).

Warm-Up Cycle

The powertrain control module (PCM) uses warm-up cycles to run some diagnostics and to clear any diagnostic trouble codes (DTCs). A warm-up cycle occurs when the engine coolant temperature increases 22°C (40°F) from the start-up temperature. The engine coolant must also achieve a minimum temperature of 71°C (160°F). The PCM counts the number of warm-up cycles in order to clear the malfunction indicator lamp (MIL). The PCM will clear the DTCs when 40 consecutive warm-up cycles occur without a malfunction.

Diagnostic Trouble Codes (DTCs)

The powertrain control module (PCM) is programmed with test routines that test the operation of the various systems the PCM controls. Some tests monitor internal PCM functions. Many tests are run continuously. Other tests run only under specific conditions, referred to as Conditions for Running the DTC. When the vehicle is operating within the conditions for running a particular test, the PCM monitors certain parameters and determines if the values are within an expected range. The parameters and values considered outside the range of normal operation are listed as Conditions for Setting the DTC. When the Conditions for Setting the DTC occur, the PCM executes the Action Taken When the DTC Sets. Some DTCs alert the driver via the malfunction indicator lamp (MIL) or a message. Other DTCs do not trigger a driver warning, but are stored in memory. The PCM also saves data and input parameters when most DTCs are set. This data is stored in the Freeze Frame and/or Failure Records.

The DTCs are categorized by type. The DTC type is determined by the MIL operation and the manner in which the fault data is stored when a particular DTC fails. In some cases there may be exceptions to this structure. Therefore, when diagnosing the system it is important to read the Action Taken When the DTC Sets and the Conditions for Clearing the DTC in the supporting text.

There are different types of DTCs and different actions taken when the DTCs set. Refer to Diagnostic Trouble Code (DTC) Type Definitions for a description of the general characteristics of each DTC type.

DTC Status

When the scan tool displays a DTC, the status of the DTC is also displayed. The following DTC statuses are indicated only when they apply to the DTC that is set.

Scheme 95

The throttle actuator control (TAC) system uses the vehicle electronics and components in order to calculate and control the position of the throttle blade. This system eliminates the need for a mechanical cable attachment from the accelerator pedal to the throttle body. This system also performs the cruise control functions.

The TAC system components include but is not limited to the following

1. The accelerator pedal position (APP) sensor
2. The throttle body
3. The throttle actuator control (TAC) module
4. The powertrain control module (PCM)

Each of these components interface together in order to ensure accurate calculations, and in order to control the throttle position.

Scheme 96

The accelerator pedal position (APP) sensor is mounted on the accelerator pedal assembly. The APP is actually 3 individual accelerator pedal position sensors within 1 housing. Three separate signal, low reference, and 5-volt reference circuits are used in order to connect the APP and the TAC module. The APP sensor 1 voltage should increase at the same time that the accelerator pedal is depressed, from below 1 volt at 0 percent pedal travel to above 2 volts at 100 percent pedal travel. APP sensor 2 voltage should decrease from above 4 volts at 0 pedal travel to below 2.9 volts at 100 percent pedal travel. APP sensor 3 voltage should decrease from above 3.8 volts at 0 pedal travel to below 3.1 volts at 100 percent pedal travel.

Scheme 97

The throttle body for the TAC system is similar to a conventional throttle body with some exceptions. One exception is the use of a motor to control the throttle position (TP) instead of a mechanical cable. The other exception is the new design TP sensor. The TP sensor mounts on the side of the throttle body opposite the throttle actuator motor. The TP sensor is actually 2 individual TP sensors within 1 housing. Separate low reference and 5-volt reference circuits are used in order to connect the TP sensors and the TAC module. The TP sensor 1 signal voltage increases at the same time that the throttle opens. The voltage increases, from approximately 1 volt at 0 throttle to above 3.5 volts at 100 percent throttle. TP sensor 2 signal voltage decreases at the same time that the throttle is opened. The voltage increases from approximately 3.8 volts at 0 throttle to below 1 volt at 100 percent throttle.

Scheme 98

The TAC module is the control center for the electronic throttle system. The TAC module and the PCM communicate via a dedicated redundant serial data circuit. The TAC module and the PCM monitor the commanded throttle position and compare the commanded position to the actual throttle position. This is accomplished by monitoring the APP and the TP sensor. These 2 values must be within a calibrated value of each other. The TAC module also monitors each individual circuit of the TP sensor, and of the APP to verify proper operation.

Fuel System Overview

An electric turbine style fuel pump attaches to the fuel sender assembly inside the fuel tank. The fuel pump supplies high pressure fuel through the fuel filter and the fuel feed pipe to the fuel injection system. The fuel pump provides fuel at a higher rate of flow than is needed by the fuel injection system. The fuel pump also supplies fuel to a venturi pump located on the bottom of the fuel sender assembly. The function of the venturi pump is to fill the fuel sender assembly reservoir. The fuel pressure regulator, a part of the fuel sender assembly, maintains the correct fuel pressure to the fuel injection system. The fuel pump and sender assembly contains a reverse flow check valve. The check valve and the fuel pressure regulator maintain fuel pressure in the fuel feed pipe and the fuel rail in order to prevent long cranking times.

Fuel Tank

The fuel storage tank is made of high density polyethylene. The fuel storage tank is held in place by two metal straps that are attached to the under body of the vehicle. The tank shape includes a sump in order to maintain a constant supply of fuel around the fuel pump strainer during low fuel conditions or during aggressive maneuvers.

The fuel tank also contains a fuel vapor vent valve with a roll-over protection. The vent valve also features a two phase vent calibration which increases the fuel vapor flow to the canister when the operating temperatures increase the tank pressure beyond an established threshold.

On-Board Refueling Vapor Recovery (ORVR) System

The on-board refueling vapor recovery (ORVR) system is an on-board vehicle system to recover fuel vapors during the vehicle refueling operation. The flow of liquid fuel down to the fuel tank filler neck provides a liquid seal. The purpose of ORVR is to prevent refueling vapor from exiting the fuel tank filler neck.

Fuel Tank Filler Pipe

In order to prevent refueling with leaded fuel, the fuel filler pipe has a built-in restrictor and a deflector. The opening in the restrictor will accept only the smaller unleaded gasoline fuel nozzle which must be fully inserted in order to bypass the deflector. The tank is vented during filling by an internal vent tube inside of the filler pipe.

Scheme 99

Note. Use a fuel tank filler pipe cap with the same features as the original when a replacement is necessary. Failure to use the correct fuel tank filler pipe cap can result in a serious malfunction of the fuel system.

The fuel tank filler pipe is equipped with a ratchet action in order to prevent over-tightening.

The turn to vent feature allows the fuel tank pressure relief prior to removal. Instructions for proper use are imprinted on the cap cover. A vacuum safety relief valve is incorporated into this cap.

Scheme 100

The modular fuel sender assembly mounts to the threaded opening of the plastic fuel tank with a multi-lipped seal and a threaded retainer (nut). The reservoir, containing the exterior inlet strainer, the electric fuel pump and the pump strainer, maintains contact with the tank bottom. This design provides

1. Optimum fuel level in the integral fuel reservoir during all fuel tank levels and during driving conditions
2. Improved tank fuel level measuring accuracy
3. Improved coarse straining and added pump inlet filtering
4. More extensive internal fuel pump isolation for noiseless operation

Fuel Pump

The electric fuel pump is a turbine pump which is located inside of the modular fuel sender. The electric fuel pump operation is controlled by the powertrain control module (PCM) through the fuel pump relay.

Fuel Sender Strainers

The strainers act as a coarse filter to perform the following functions

1. Filter contaminants
2. Separate water from fuel
3. Provide a wicking action that helps draw fuel into the fuel pump

Fuel stoppage at the strainer indicates that the fuel tank contains an abnormal amount of sediment or water. Therefore, the fuel tank will need to be removed and cleaned, and the filter strainer should be replaced.

EVAP Lines and Hoses

The evaporative emission (EVAP) line extends from the fuel tank vent valve to the EVAP canister and into the engine compartment. The EVAP line is made of nylon and connects to the EVAP canister with a fuel resistant rubber hose and quick connect fittings.

Scheme 101

The fuel filter is located on the fuel feed pipe between the fuel pump and the fuel rail. The electric fuel pump supplies fuel through the in-line fuel filter to the Fuel Injection System. The fuel pressure regulator keeps the fuel available to the fuel injectors at a regulated pressure. Unused fuel is returned from the fuel filter to the fuel tank by a separate fuel return pipe. The paper filter element (2) traps particles in the fuel that may damage the Fuel Injection System. The filter housing (1) is made to withstand maximum fuel system pressure, exposure to fuel additives, and changes in temperature. There is no service interval for fuel filter replacement. Replace a restricted fuel filter.

Scheme 102

The fuel pressure regulator attaches to the fuel return pipe on the fuel sender assembly. The fuel pressure regulator is a diaphragm-operated relief valve. A software bias compensates the injector on-time because the fuel pressure regulator is not referenced to manifold vacuum. The injector pulse width varies with the signal from the mass air flow (MAF)/intake air temperature (IAT) sensor.

With the engine running at idle, the system fuel pressure at the pressure test connection should be between 380-410 kPa (55-60 psi). With the system pressurized and the pump OFF the pressure should stabilize and hold. If the pressure regulator supplies a fuel pressure which is too low or too high, a driveability condition will result.

Scheme 103

The fuel rail assembly attaches to the engine intake manifold. The fuel rail assembly performs the following functions

1. Positions the injectors (1) in the intake manifold
2. Distributes the fuel evenly to the injectors
3. Integrates the fuel pulse dampener (2) into the fuel metering system.

The fuel rail is mounted on the intake manifold and distributes the fuel to each cylinder through the individual injectors.

Fuel Injectors

The fuel injector assembly is a solenoid device, controlled by the PCM, that meters pressurized fuel to a single engine cylinder. The PCM energizes the injector solenoid to open a normally closed ball valve. This allows the fuel to flow into the top of the injector, past the ball valve, and through a director plate at the injector outlet. The director plate has machined holes that control the fuel flow, generating a spray of finely-atomized fuel at the injector tip. Fuel from the injector tip is directed at the intake valve, causing the fuel to become further atomized and vaporized before entering the combustion chamber. This fine atomization improves fuel economy and emissions.

Starting Mode

When the PCM detects reference pulses from the crankshaft position (CKP) sensor, the PCM will enable the fuel pump. The fuel pump runs and builds up pressure in the fuel system. The PCM then monitors the MAF, IAT, engine coolant temperature (ECT), and the throttle position (TP) sensor signals in order to determine the required injector pulse width for starting.

Clear Flood Mode

If the engine is flooded with fuel during starting and will not start, the Clear Flood Mode can be manually selected. To select Clear Flood Mode, push the accelerator to wide open throttle (WOT). With this signal, the PCM will completely turn OFF the injectors and will maintain this stage as long as the PCM indicates a WOT condition with engine speed below 1,000 RPM.

Run Mode

The Run Mode has 2 conditions: Open Loop operation and Closed Loop operation. When the engine is first started and the engine speed is above 480 RPM, the system goes into an Open Loop operation. In an Open Loop operation, the PCM ignores the signals from the oxygen sensors and calculates the required injector pulse width based primarily on inputs from the MAF, IAT and ECT sensors.

In a Closed Loop, the PCM adjusts the calculated injector pulse width for each bank of injectors based on the signals from each oxygen sensor.

Acceleration Mode

The PCM monitors the changes in the TP and the MAF sensor signals in order to determine when the vehicle is being accelerated. The PCM will then increase the injector pulse width in order to provide more fuel for improved driveability.

Deceleration Mode

The PCM monitors changes in throttle position (TP) and mass air flow (MAF) sensor signals to determine when the vehicle is being decelerated. The PCM will then decrease injector pulse width or even shut OFF injectors for short periods to reduce exhaust emissions.

Battery Voltage Correction Mode

The PCM can compensate in order to maintain acceptable vehicle driveability when the PCM sees a low battery voltage condition. The PCM compensates by performing the following functions

1. Increasing the injector pulse width in order to maintain the proper amount of fuel being delivered
2. Increasing the idle speed to increase the generator output

Fuel Cutoff Mode

The PCM cuts OFF fuel from the fuel injectors when the following conditions are met in order to protect the powertrain from damage and improve driveability

1. The ignition is OFF. This prevents engine run-on.
2. The ignition is ON but there is no ignition reference signal. This prevents flooding or backfiring.
3. The engine speed is too high, above red line.
4. The vehicle speed is too high, above rated tire speed.
5. During an extended, high speed, closed throttle coast down-This reduces emissions and increases engine braking.
6. During extended deceleration, in order to prevent damage to the catalytic converters

Fuel Trim

The powertrain control module (PCM) controls the air/fuel metering system in order to provide the best possible combination of driveability, fuel economy, and emission control. The PCM monitors the heated oxygen sensor (HO2S) signal voltage while in Closed Loop and regulates the fuel delivery by adjusting the pulse width of the fuel injectors based on this signal. The ideal fuel trim values are around 0 percent for both short term and long term fuel trim. A positive fuel trim value indicates the PCM is adding fuel in order to compensate for a lean condition by increasing the pulse width. A negative fuel trim value indicates that the PCM is reducing the amount of fuel in order to compensate for a rich condition by decreasing the pulse width. A change made to the fuel delivery changes the short term and long term fuel trim values. The short term fuel trim values change rapidly in response to the HO2S signal voltage. These changes fine tune the engine fueling. The long term fuel trim makes coarse adjustments to the fueling in order to re-center and restore control to short term fuel trim. A scan tool can be used to monitor the short term and long term fuel trim values. The long term fuel trim diagnostic is based on an average of several of the long term speed load learn cells. The PCM selects the cells based on the engine speed and engine load. If the PCM detects an excessive lean or rich condition, the PCM will set a fuel trim diagnostic trouble code (DTC).

EVAP System Operation

The evaporative emission (EVAP) control system limits fuel vapors from escaping into the atmosphere. Fuel tank vapors are allowed to move from the fuel tank, due to pressure in the tank, through the vapor pipe, into the EVAP canister. Carbon in the canister absorbs and stores the fuel vapors. Excess pressure is vented through the vent line and EVAP vent solenoid valve to the atmosphere. The EVAP canister stores the fuel vapors until the engine is able to use them. At an appropriate time, the control module will command the EVAP purge solenoid valve ON, allowing engine vacuum to be applied to the EVAP canister. With the EVAP vent solenoid valve OFF, fresh air is drawn through the vent solenoid valve and the vent line to the EVAP canister. Fresh air is drawn through the canister, pulling fuel vapors from the carbon. The air/fuel vapor mixture continues through the EVAP purge pipe and EVAP purge solenoid valve into the intake manifold to be consumed during normal combustion. The control module uses several tests to determine if the EVAP system is leaking.

Large Leak Test

This tests for large leaks and blockages in the evaporative emission (EVAP) system. The control module commands the EVAP vent solenoid valve ON and commands the EVAP purge solenoid valve ON, with the engine running, allowing engine vacuum into the EVAP system. The control module monitors the fuel tank pressure (FTP) sensor voltage to verify that the system is able to reach a predetermined level of vacuum within a set amount of time. The control module then commands the EVAP purge solenoid valve OFF, sealing the system, and monitors the vacuum level for decay. If the control module does not detect that the predetermined vacuum level was achieved, or the vacuum decay rate is more than a calibrated level on 2 consecutive tests, DTC P0455 will set.

Small Leak Test

The engine off natural vacuum (EONV) diagnostic is the small-leak detection diagnostic for the evaporative emission (EVAP) system. While previous leak detection methods were performed with the engine running, the EONV diagnostic monitors the EVAP system pressure or vacuum with the ignition OFF. Because of this, it may be normal for the control module to remain active for up to 40 minutes after the ignition is turned OFF. This is important to remember when performing a parasitic draw test on vehicles equipped with EONV.

The EONV utilizes the temperature changes in the fuel tank immediately following a drive cycle to use the naturally occurring vacuum or pressure in the fuel tank. When the vehicle is driven, the temperature rises in the tank. After the vehicle is parked, the temperature in the tank continues to rise for a period of time, then starts to drop. The EONV diagnostic relies on this temperature change and the corresponding pressure change in a sealed system, to determine if an EVAP system leak is present.

The EONV diagnostic is designed to detect leaks as small as 0.51 mm (0.020 in). The diagnostic can determine if a small leak is present based on vacuum or pressure readings in the EVAP system. When the system is sealed, a finite amount of pressure or vacuum will be observed. When a 0.51 mm (0.020 in) leak is present, often little or no pressure or vacuum is observed. If the test reports a failing value, DTC P0442 will set.

Canister Vent Restriction Test

If the evaporative emission (EVAP) vent system is restricted, fuel vapors will not be properly purged from the EVAP canister. The control module tests this by commanding the EVAP purge solenoid valve ON, commanding the EVAP vent solenoid valve OFF, and monitoring the fuel tank pressure (FTP) sensor for an increase in vacuum. If the vacuum increases more than a calibrated value, DTC P0446 will set.

Purge Solenoid Valve Leak Test

If the evaporative emission (EVAP) purge solenoid valve does not seal properly fuel vapors could enter the engine at an undesired time, causing driveability concerns. The control module tests for this by commanding the EVAP purge solenoid valve OFF and the vent solenoid valve ON, sealing the system, and monitors the fuel tank pressure (FTP) for an increase in vacuum. If the control module detects that the EVAP system vacuum increases above a calibrated value, DTC P0496 will set.

Check Gas Cap Message

The powertrain control module (PCM) sends a class 2 message to the driver information center (DIC) illuminating the Check Gas Cap message when any of the following occur

1. A malfunction in the evaporative emission (EVAP) system and a large leak test fails
2. A malfunction in the EVAP system and a small leak test fails

EVAP System Components

The evaporative emission (EVAP) system consists of the following components

EVAP Canister

The canister is filled with carbon pellets used to absorb and store fuel vapors. Fuel vapor is stored in the canister until the control module determines that the vapor can be consumed in the normal combustion process.

EVAP Purge Solenoid Valve

The EVAP purge solenoid valve controls the flow of vapors from the EVAP system to the intake manifold. The purge solenoid valve opens when commanded ON by the control module. This normally closed valve is pulse width modulated (PWM) by the control module to precisely control the flow of fuel vapor to the engine. The valve will also be opened during some portions of the EVAP testing, allowing engine vacuum to enter the EVAP system.

EVAP Vent Solenoid Valve

The EVAP vent solenoid valve controls fresh airflow into the EVAP canister. The valve is normally open. The control module commands the valve ON, closing the valve during some EVAP tests, allowing the system to be tested for leaks.

Fuel Tank Pressure Sensor

The fuel tank pressure (FTP) sensor measures the difference between the pressure or vacuum in the fuel tank and outside air pressure. The control module provides a 5-volt reference and a ground to the FTP sensor. The FTP sensor provides a signal voltage back to the control module that can vary between 0.1-4.9 volts. A high FTP sensor voltage indicates a low fuel tank pressure or vacuum. A low FTP sensor voltage indicates a high fuel tank pressure.

EVAP Service Port

The EVAP service port is located in the EVAP purge pipe between the EVAP purge solenoid valve and the EVAP canister. The service port is identified by a green colored cap.

Electronic Ignition (EI) System Description

The electronic ignition (EI) system is responsible for producing and controlling a high energy secondary spark. This spark is used to ignite the compressed air/fuel mixture at precisely the correct time. This provides optimal performance, fuel economy, and control of exhaust emissions. This ignition system consists of a separate ignition coil connected to each spark plug by a short secondary wire. The driver modules within each coil assembly are commanded ON/OFF by the powertrain control module (PCM). The PCM primarily uses engine speed and position information from the crankshaft and camshaft position (CMP) sensors to control the sequence, dwell, and timing of the spark. The EI system consists of the following components

Crankshaft Position (CKP) Sensor

The crankshaft position (CKP) sensor is a three wire sensor based on the magneto resistive principle. A magneto resistive sensor uses two magnetic pickups between a permanent magnet. As an element such as a reluctor wheel passes the magnets the resulting change in the magnetic field is used by the sensor electronics to produce a digital output pulse. The PCM supplies a 12-volt, low reference, and signal circuit to the CKP sensor. The sensor returns a digital ON/OFF pulse 24 times per crankshaft revolution.

Crankshaft Reluctor Wheel

The crankshaft reluctor wheel is mounted on the rear of the crankshaft. The wheel is comprised of four 90 degree segments. Each segment represents a pair of cylinders at TDC, and is further divided into six 15 degree segments. Within each 15 degree segment is a notch of 1 of 2 different sizes. Each 90 degree segment has a unique pattern of notches. This is known as pulse width encoding. This pulse width encoded pattern allows the PCM to quickly recognize which pair of cylinders are at top dead center (TDC). The reluctor wheel is also a dual track-or mirror image-design. This means there is an additional wheel pressed against the first, with a gap of equal size to each notch of the mating wheel. When one sensing element of the CKP sensor is reading a notch, the other is reading a set of teeth. The resulting signals are then converted into a digital square wave output by the circuitry within the CKP sensor.

Camshaft Position (CMP) Sensor

The CMP sensor is also a magneto resistive sensor, with the same type of circuits as the CKP sensor. The CMP sensor signal is a digital ON/OFF pulse, output once per revolution of the camshaft. The CMP sensor information is used by the PCM to determine the position of the valve train relative to the CKP.

Camshaft Reluctor Wheel

The camshaft reluctor wheel is either pressed onto the camshaft or part of the timing gear depending on the application. The feature-or target- is read in a radial or axial fashion respectively. The wheel is a smooth track, half of which is of a lower profile than the other half. This feature allows the CMP sensor to supply a signal as soon as the key is turned ON, since the CMP sensor reads the track profile, instead of a notch.

Ignition Coils

Each ignition coil has an ignition 1 feed and a ground. The PCM supplies a low reference and an ignition control (IC) circuit. Each ignition coil contains a solid state driver module. The PCM will command the IC circuit ON, this allows the current to flow through the primary coil windings for the appropriate time or dwell. When the PCM commands the IC circuit OFF, this will interrupt current flow through the primary coil windings. The magnetic field created by the primary coil windings will collapse across the secondary coil windings, which induces a high voltage across the spark plug electrodes. The coils are current limited to prevent overloading if the IC current is held high too long. The spark plugs are connected to their respective coils by a short secondary wire. The spark plugs are tipped with iridium for long life and efficiency.

Powertrain Control Module (PCM)

The PCM controls all ignition system functions, and constantly corrects the basic spark timing. The PCM monitors information from various sensor inputs that include the following

1. The throttle position (TP) sensor
2. The engine coolant temperature (ECT) sensor
3. The mass air flow (MAF) sensor
4. The intake air temperature (IAT) sensor
5. The vehicle speed sensor (VSS)
6. The transmission gear position or range information sensors
7. The engine knock sensors (KS)

Modes of Operation

There is one normal mode of operation, with the spark under PCM control. If the CKP pulses are lost the engine will not run. The loss of a CMP signal may result in a longer crank time since the PCM cannot determine which stroke the pistons are on. Diagnostic trouble codes are available to accurately diagnose the ignition system with a scan tool.

Purpose

The knock sensor (KS) system enables the control module to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation. The control module uses the KS system to test for abnormal engine noise that may indicate detonation, also known as spark knock.

Sensor Description

This knock sensor (KS) system uses one or 2 broadband one-wire sensors. The sensor uses piezo-electric crystal technology that produces an AC voltage signal of varying amplitude and frequency based on the engine vibration, or noise, level. The amplitude and frequency are dependant upon the level of knock that the KS detects. The control module receives the KS signal through a signal circuit. The KS ground is supplied by the engine block through the sensor housing.

One way the control module monitors the system is by output of a bias voltage on the KS signal wire. The bias voltage creates a voltage drop that the control module monitors and uses to help diagnose KS faults. The KS noise signal rides along this bias voltage, and due to the constantly fluctuating frequency and amplitude of the signal, will always be outside of the bias voltage parameters.

Another way the control module monitors the system is by learning the average normal noise output from the KS. The control module learns a minimum noise level, or background noise, at idle from the KS and uses calibrated values for the rest of the RPM range. The control module uses the minimum noise level to calculate a noise channel. The control module uses this noise channel, and the KS signal that rides along the noise channel, in much the same way as the bias voltage type does. As engine speed and load change, the noise channel upper and lower parameters will change to accommodate the normal KS signal.

In order to determine which cylinders are knocking, the control module only uses KS signal information when each cylinder is near top dead center (TDC) of the firing stroke. If the control module has determined that knock is present, it will retard the ignition timing to attempt to eliminate the knock. The control module will always try to work back to a zero compensation level, or no spark retard. An abnormal KS signal will fall within the noise channel or will not be present. KS diagnostics are calibrated to detect faults with the KS circuitry inside the control module, the KS wiring, or the KS voltage output.

Air Intake System Description

The primary function of the air intake system is to provide filtered air to the engine. The system uses a cleaner element mounted in a housing. The cleaner housing is remotely mounted and uses intake ducts to route the incoming air into the throttle body. The secondary function of the air intake system is to muffle air induction noise. This is achieved through the use of resonators attached to the air intake ducts. The resonators are tuned to the specific powertrain. The mass air flow (MAF) sensor is used to measure the air entering the engine.

Special Tools

Special Tools Illustration Tool Number/Description J 22610 Service Boot Clamp J 23738-A Vacuum Pump J 26792 Spark Tester J 34142-B Test Light J 34730-1A Fuel Pressure Gage J 34730-405 Injector Test Light (EFI Lite) J 35616-A Connector Test Adapter Kit J 36169-A Fused Jumper Wire J 36850 Transjel Lubricant J 37287 Inlet and Return Fuel Line Shut-Off Adapters J 38500-A Fuel Injector Cleaner J 38522 Variable Signal Generator J 39021 Fuel Injector Coil/Balance Tester J 39200 Digital Multimeter J 39765 Fuel Sender Lock Nut Wrench J 41413-200 Evaporative Emissions System Tester (EEST) J 41413-SPT High Intensity White Light J 41413-306 EVAP Plug J 41413-307 EVAP Plug J 414130-311 EVAP Plug J 41413-VLV EVAP Service Port Vent Fitting J 41415-40 Fuel Tank Cap Adapter J 41415-50 Interrupted Thread Fuel Tank Cap Adapter J 41416 Ultrasonic Leak Detector J 42236-A Serial Data Link Test J 42598 Vehicle Data Recorder J 42960-2 Fuel Door Holder J 43244 Relay Puller Pliers J 44175 Fuel Composition Tester J 44581 Fuel Line Disconnect Tool J 45004 Fuel Tank Drain Hose J 45747 Fuel Tank Sender Wrench Tech 2 Kit 7000081

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See also:
• Battery Negative Cable Disconnect/Connect Procedure
• Lifting and Jacking the Vehicle
• Air Deflector Replacement - Front
• Fastener Notice
• Service Programming System (SPS)
• Diagnostic Trouble Code (DTC) List
• DTC P0315
• Draining and Filling Cooling System (LA3, LY9)
• Fuel Injector Sight Shield Replacement
• Heated Oxygen and Oxygen Sensor Notice
• Excessive Force and Oxygen Sensor Notice
• Catalytic Converter Replacement - Right (LA3, LY9)
• Catalytic Converter Replacement - Right (LY7)
• Catalytic Converter Replacement - Right (LS6)
• Closeout/Insulator Panel Replacement - Left
• Gasoline/Gasoline Vapors Caution
• Fuel Tank Draining Procedure
• Exhaust System Replacement (LA3, LY9)
• Exhaust System Replacement (LY7)
• Exhaust System Replacement (LS6)
• Propeller Shaft Replacement (Automatic Transmission)
• Tire and Wheel Removal and Installation
• Component Fastener Tightening Notice
• Battery Disconnect Caution
• Transmission Support Replacement
• Air Cleaner Outlet Duct Replacement
• CKP System Variation Learn Procedure