Test Description
The number below refers to the step number on the diagnostic table.
- 3: This step tests for a short to voltage on the MIL control circuit. With the fuse removed there should be no voltage on the MIL control circuit.
| Step | Action | Values | Yes | No |
|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Powertrain Control Module (PCM) Connector End Views or Engine Controls Connector End Views |
| 1 | Did you perform the Diagnostic System Check - Vehicle? | | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
| 2 | Command the malfunction indicator lamp (MIL) ON and OFF with a scan tool. Does the MIL turn ON and OFF when commanded with a scan tool? | | Go to Intermittent Conditions | Go to Step 3 |
| 3 | Turn OFF the ignition. Remove the fuse that supplies voltage to the instrument panel cluster (IPC). Disconnect the powertrain control module (PCM). Turn ON the ignition, with the engine OFF. Measure the voltage from the MIL control circuit in the PCM harness connector to a good ground. Is the voltage less than the specified value? | 0.3 V | Go to Step 4 | Go to Step 8 |
| 4 | Turn OFF the ignition. Install the fuse that supplies voltage to the IPC. Turn ON the ignition with the engine OFF. Connect a 3-amp fused jumper wire between the MIL control circuit in the PCM harness connector and a good ground. Is the MIL illuminated? | | Go to Step 7 | Go to Step 5 |
| 5 | Test the MIL control circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct a condition? | | Go to Step 11 | Go to Step 6 |
| 6 | Test for an intermittent and for a poor connection at the IPC. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | | Go to Step 11 | Go to Step 9 |
| 7 | Test for an intermittent and for a poor connection at the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | | Go to Step 11 | Go to Step 10 |
| 8 | Repair the short to voltage in the MIL control circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | | Go to Step 11 | |
| 9 | Replace the IPC. Refer to Instrument Panel Cluster (IPC) Replacement in Instrument Panel, Gages, and Console. Did you complete the replacement? | | Go to Step 11 | |
| 10 | Replace the PCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | | Go to Step 11 | |
| 11 | Remove all test equipment. Connect any disconnected components or any disconnected fuses. Turn OFF the ignition for 30 seconds. Start the engine and operate the vehicle to verify the performance, and driveability. Observe the MIL, the vehicle performance, and the driveability. Does the vehicle operate correctly, without MIL illumination and without stored DTCs? | | System OK | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information |
Malfunction Indicator Lamp (MIL) Inoperative
The number below refers to the step number on the diagnostic table.
- 2: This step determines if the condition is with the MIL control circuit or the PCM.
| Step | Action | Yes | No |
|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Powertrain Control Module (PCM) Connector End Views or Engine Controls Connector End Views |
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
| 2 | Turn OFF the ignition. Disconnect the powertrain control module (PCM). Turn ON the ignition, with the engine OFF. Observe the malfunction indicator lamp (MIL). Is the MIL illuminated? | Go to Step 3 | Go to Step 5 |
| 3 | Remove the instrument panel cluster (IPC). Refer to Instrument Panel Cluster (IPC) Replacement in Instrument Panel, Gages, and Console. Test the MIL control circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 6 | Go to Step 4 |
| 4 | Replace the IPC. Refer to Instrument Panel Cluster (IPC) Replacement in Instrument Panel, Gages, and Console. Did you complete the replacement? | Go to Step 6 | |
| 5 | Replace the PCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | Go to Step 6 | |
| 6 | Turn the ignition OFF for 30 seconds. Start the engine. Does the vehicle operate correctly without MIL illumination, and without stored DTCs? | System OK | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information |
Malfunction Indicator Lamp (MIL) Always On
Description
The Engine Cranks but Does Not Run diagnostic table is an organized approach to identifying a condition that causes an engine not to start. The Engine Cranks but Does Not Run diagnostic table directs the service technician to the appropriate system diagnosis.
The Engine Cranks but Does Not Run diagnostic table assumes the following
- The engine cranking speed is acceptable.
- There is adequate fuel in the fuel tank.
| Step | Action | Value(s) | Yes | No |
|---|
| 1 | Did you perform the Diagnostic System Check - Vehicle? | | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
| 2 | Turn ON the ignition, with the engine OFF. Observe the DTC Information with a scan tool. Does the scan tool display DTCs P0201, P0202, P0203, P0204, P0335, P0336, P0601, P0602, P0603, P0604, P0606, P0607, P0641, P0651, P1621, P1630, P1631, P1680, P1681, or P2610? | | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information | Go to Step 3 |
| 3 | Does the scan tool display any body control module (BCM) vehicle theft deterrent (VTD) DTCs? | | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information | Go to Step 4 |
| 4 | Turn ON the ignition, with the engine OFF. Probe both sides of the ECM/ETC fuse with a test lamp connected to a good ground. Does the test lamp illuminate on at least one side of the fuse? | | Go to Step 5 | Go to Powertrain Relay Diagnosis |
| 5 | Command the fuel pump ON with a scan tool. Does the fuel pump operate? | | Go to Step 6 | Go to Fuel Pump Electrical Circuit Diagnosis |
| 6 | Turn OFF the ignition. Remove the ignition coil housing. IMPORTANT: Not grounding the ignition coil housing, may cause erratic spark. Install a jumper wire from the ignition control module to a good ground. Install the J 36012-A Ignition System Diagnostic Harness. Special Tools . Install a J 26792 Spark Tester on #1 spark plug jumper wire. Special Tools . Ground #4 (companion to #1) spark plug jumper wire. Crank the engine with the remaining spark plug jumper wires connected. Repeat the above steps by installing the spark tester on #4 and grounding #1. Do the same for #2 and #3 spark plugs. Ensure that the companion wire is grounded. Does the spark tester spark on all cylinders? | | Go to Step 7 | Go to Electronic Ignition (EI) System Diagnosis |
| 7 | Turn OFF the ignition. Disconnect an injector connector. Install the J 34730-405 Injector Test Lamp to the injector connector. Special Tools . Attempt to start the engine. Does the test lamp blink while the engine is cranking? | | Go to Step 8 | Go to Fuel Injector Circuit Diagnosis |
| 8 | Turn OFF the ignition. Install a fuel pressure gage. Refer to Fuel Pressure Gage Installation and Removal . Turn ON the ignition, with the engine OFF. Command the fuel pump ON with a scan tool. Is the fuel pressure within the specified range while the fuel pump is operating? | 345-414 kPa (50-60 psi) | Go to Step 9 | Go to Fuel System Diagnosis |
| 9 | Inspect for the following conditions: Collapsed air intake duct Restricted air filter element-Refer to Air Cleaner Element Replacement . Contaminated fuel-Refer to Alcohol/Contaminants-in-Fuel Diagnosis (w/o Special Tool) or Alcohol/Contaminants-in-Fuel Diagnosis (w/Special Tool) . Spark plugs for being gas or coolant fouled-Refer to Spark Plug Inspection . If the spark plugs are fouled, determine what caused the condition. Engine mechanical condition, worn timing chain and gears, low compression-Refer to Symptoms - Engine Mechanical in Engine Mechanical. Restricted exhaust system-Refer to Restricted Exhaust in Engine Exhaust. An engine coolant temperature (ECT) sensor that has shifted in value-Refer to Temperature vs Resistance . A skewed manifold absolute pressure (MAP) sensor- Refer to Altitude vs Barometric Pressure . Did you complete the action? | | Go to Step 10 | |
| 10 | Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Attempt to start the engine. Does the engine start then continue to run? | | Go to Step 11 | Go to Step 2 |
| 11 | Allow the engine to reach operating temperature. Observe the DTC information with a scan tool. Are there any DTCs that have not been diagnosed? | | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information | System OK |
| IMPORTANT |
|---|
| Not grounding the ignition coil housing, may cause erratic spark. |
Engine Cranks but Does Not Run
Scheme 47
Scheme 47: Supercharger Intercooler Relay Diagnosis
System Description
The control module enables the fuel pump relay when the ignition switch is turned ON. The control module will disable the fuel pump relay within two seconds unless the control module detects ignition reference pulses. The control module continues to enable the fuel pump relay as long as ignition reference pulses are detected. The control module disables the fuel pump relay within two seconds if ignition reference pulses cease to be detected and the ignition remains ON.
The fuel tank stores the fuel supply. 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 cracking times.
| Step | Action | Values | Yes | No |
|---|
| 1 | Did you perform the Diagnostic System Check - Vehicle? | | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
| 2 | IMPORTANT: Inspect the fuel system for damage or external leaks before proceeding with this diagnostic. Turn ON the ignition, with the engine OFF. Command the fuel pump relay ON with a scan tool. Does the fuel pump operate? | | Go to Step 3 | Go to Fuel Pump Electrical Circuit Diagnosis |
| 3 | IMPORTANT: Verify that adequate fuel is in the fuel tank before proceeding with this diagnostic. Turn OFF the ignition. Turn OFF all accessories. Install the SA9127E Gage Bar Set with the Fuel Pressure Adapter and the Drain Hose. Special Tools . Refer to Fuel Pressure Gage Installation and Removal . Turn ON the ignition, with the engine OFF. IMPORTANT: DO NOT start the engine. Command the fuel pump relay ON with a scan tool. Observe the fuel pressure gage with the fuel pump commanded ON. Is the fuel pressure within the specified range? | 345-414 kPa (50-60 psi) | Go to Step 5 | Go to Step 4 |
| 4 | Is the fuel pressure more than the specified value? | 414 kPa (60 psi) | Go to Step 11 | Go to Step 8 |
| 5 | IMPORTANT: The fuel pressure may vary slightly when the fuel pump stops operating. After the fuel pump stops operating, the fuel pressure should stabilize and remain constant. Monitor the fuel pressure gage for 5 minutes.Does the fuel pressure decrease by more than the specified value? | 55 kPa (8 psi) | Go to Step 7 | Go to Step 6 |
| 6 | Operate the vehicle within the conditions to reproduce the original symptoms. Monitor the O2 and the Fuel Trim parameters with a scan tool. Does the scan tool parameters indicate a lean condition? | | Go to Step 8 | Go to Symptoms - Engine Controls |
| 7 | Turn OFF the ignition. Relieve the fuel pressure. Refer to Fuel Pressure Relief Procedure . Remove the fuel pressure gage from the fuel pressure test connection. Raise the vehicle. Refer to Lifting and Jacking the Vehicle . Disconnect the fuel feed pipe and the fuel return pipe from the fuel filter. Refer to Quick Connect Fitting(s) Service (Plastic Collar) (Press Release) . Connect the fuel feed pipe to the inlet side of SA9127E-7 Fuel Pressure/Flow Adapter. Special Tools . Connect the fuel return pipe to the ON/OFF valve side of the SA9127E-7 . Special Tools . Connect the fuel pressure gage to the SA9127E-7 . Special Tools . Open the valve on the SA9127E-7 . Special Tools . Turn ON the ignition, with the engine OFF. Command the fuel pump relay ON for a minimum of 10 seconds with a scan tool. Close the valve on the SA9127E-7 . Special Tools . Monitor the fuel pressure gage for 5 minutes. Does the fuel pressure decrease by more than the specified value? | 55 kPa (8 psi) | Go to Step 11 | Go to Step 10 |
| 8 | Inspect the following components for a restriction: The fuel filter The fuel feed pipe Did you find and correct the condition? | | Go to Step 12 | Go to Step 9 |
| 9 | Inspect the harness connectors and the ground circuits of the fuel pump for poor connections. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | | Go to Step 12 | Go to Step 11 |
| 10 | Turn OFF the ignition. Raise the fuel rail with the fuel pipe connected. Refer to Fuel Rail Assembly Replacement . Turn ON the ignition, with the engine OFF. Command the fuel pump relay ON with a scan tool. Locate and replace the leaking fuel injector. Refer to Fuel Injector Replacement . Did you complete the replacement? | | Go to Step 12 | |
| 11 | Replace the fuel pump module. Refer to Fuel Pump Module Replacement . Did you complete the replacement? | | Go to Step 12 | |
| 12 | Operate the system in order to verify the repair. Did you correct the condition? | | System OK | Go to Step 3 |
| IMPORTANT |
|---|
| Inspect the fuel system for damage or external leaks before proceeding with this diagnostic. |
| IMPORTANT |
|---|
| Verify that adequate fuel is in the fuel tank before proceeding with this diagnostic. |
| IMPORTANT |
|---|
| DO NOT start the engine. |
| IMPORTANT |
|---|
| The fuel pressure may vary slightly when the fuel pump stops operating. After the fuel pump stops operating, the fuel pressure should stabilize and remain constant. |
The scan tool is first used to energize the fuel pump relay. The fuel injector tester is then used to pulse each injector for a precise amount of time, allowing a measured amount of fuel into the manifold. This causes a drop in system fuel pressure that can be recorded and used to compare each injector.
| Cylinder | 1 | 2 | 3 | 4 |
|---|
| 1st Reading | 379 kPa (55 psi) | 379 kPa (55 psi) | 379 kPa (55 psi) | 379 kPa (55 psi) |
| 2nd Reading | 280 kPa (41 psi) | 310 kPa (45 psi) | 340 kPa (49 psi) | 317 kPa (46 psi) |
| Amount of Drop | 99 kPa (14 psi) | 69 kPa (10 psi) | 39 kPa (6 psi) | 62 kPa (9 psi) |
| Average Range: 47-87 kPa (6.8-12.6 psi) | Replace fuel injector - too much fuel pressure drop | Injector OK | Replace fuel injector - too little fuel pressure drop | Injector OK |
Fuel Injector Balance Test Example (Actual Results May Vary)
The number below refers to the step number on the diagnostic table.
- 3: The engine coolant temperature (ECT) must be below the operating temperature in order to avoid irregular fuel pressure readings due to hot soak fuel boiling.
| Step | Action | Values | Yes | No |
|---|
| 1 | Did you perform the Diagnostic System Check - Vehicle? | | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
| 2 | Did you perform the Fuel Injector Coil Test? | | Go to Step 3 | Go to Fuel Injector Coil Test |
| 3 | IMPORTANT: DO NOT perform this test if the engine coolant temperature (ECT) is above 94°C (201°F). Observe the ECT Sensor parameter with a scan tool.Is the ECT Sensor parameter less than the specified value? | 94°C (201°F) | Go to Step 4 | |
| 4 | IMPORTANT: Verify that adequate fuel is in the fuel tank before proceeding with this diagnostic. Turn OFF the ignition. Turn OFF all accessories. Install the fuel pressure gage. Refer to Fuel Pressure Gage Installation and Removal . Turn ON the ignition, with the engine OFF. IMPORTANT: DO NOT start the engine. Command the fuel pump relay ON with a scan tool. Observe the fuel pressure gage with the fuel pump operating. Is the fuel pressure within the specified range? | 345-414 kPa (50-60 psi) | Go to Step 5 | Go to Fuel System Diagnosis |
| 5 | IMPORTANT: The fuel pressure may vary slightly when the fuel pump stops operating. After the fuel pump stops operating, the fuel pressure should stabilize and remain constant. Monitor the fuel pressure gage for 5 minutes.Does the fuel pressure decrease by more than the specified value? | 55 kPa (8 psi) | Go to Fuel System Diagnosis | Go to Step 6 |
| 6 | NOTE: Do Not repeat any portion of this test before running the engine in order to prevent the engine from flooding. Disconnect the multi-way harness connector of the fuel injectors. Connect J 39021 Fuel Injector Coil and Balance Tester or . Special Tools . SA9182E Electronic Fuel Injector Tester to the ignition 1 voltage circuit terminal and the appropriate fuel injector control circuit terminal using . Special Tools . J 35616 Connector Test Adapter Kit. Refer to Inline Harness Connector End Views in Wiring Systems. Set the selector switch on the fuel injector tester to the Balance Test in one of the following positions: J 39021 - 0. Special Tools .5-2.5 amp position SA9182E - 50 pulses / 10 ms position. Special Tools . Command the fuel pump relay ON and then OFF with a scan tool. Record the fuel pressure indicated by the fuel pressure gage after the fuel pressure stabilizes. This is the first pressure reading. IMPORTANT: The fuel pressure may rise after the fuel injector stops pulsing. Record the fuel pressure value immediately after the fuel injector stops pulsing. DO NOT record the higher fuel pressure value. Energize the fuel injector by depressing the Push to Start Test button on the fuel injector tester. Record the fuel pressure indicated by the fuel pressure gage after the fuel injector has stopped pulsing. This is the second pressure reading. Repeat items 2-7 above for each fuel injector. Subtract the second pressure reading from the first pressure reading for one fuel injector. The result is the pressure drop value. Obtain a pressure drop value for each fuel injector. Add all of the individual pressure drop values. This is the total pressure drop. Divide the total pressure drop by the number of fuel injectors. This is the average pressure drop. Is the difference between any individual pressure drop and the average pressure drop more than the specified value? | 20 kPa (3 psi) | Go to Step 7 | Go to Symptoms - Engine Controls |
| 7 | Replace the fuel injectors. Refer to Fuel Injector Replacement . Did you complete the replacement? | | Go to Step 8 | |
| 8 | Operate the system in order to verify the repair. Did you correct the condition? | | System OK | Go to Symptoms - Engine Controls |
| IMPORTANT |
|---|
| DO NOT perform this test if the engine coolant temperature (ECT) is above 94°C (201°F). |
| IMPORTANT |
|---|
| Verify that adequate fuel is in the fuel tank before proceeding with this diagnostic. |
| IMPORTANT |
|---|
| DO NOT start the engine. |
| IMPORTANT |
|---|
| The fuel pressure may vary slightly when the fuel pump stops operating. After the fuel pump stops operating, the fuel pressure should stabilize and remain constant. |
| NOTE |
|---|
| Do Not repeat any portion of this test before running the engine in order to prevent the engine from flooding. |
| IMPORTANT |
|---|
| The fuel pressure may rise after the fuel injector stops pulsing. Record the fuel pressure value immediately after the fuel injector stops pulsing. DO NOT record the higher fuel pressure value. |
Fuel Injector Balance Test with Special Tool
The scan tool is first used to energize the fuel pump relay. The scan tool is then used to pulse each injector for a precise amount of time allowing a measured amount of fuel into the manifold. This causes a drop in system fuel pressure that can be recorded and used to compare each injector.
| Cylinder | 1 | 2 | 3 | 4 |
|---|
| 1st Reading | 379 kPa (55 psi) | 379 kPa (55 psi) | 379 kPa (55 psi) | 379 kPa (55 psi) |
| 2nd Reading | 280 kPa (41 psi) | 310 kPa (45 psi) | 340 kPa (49 psi) | 317 kPa (46 psi) |
| Amount of Drop | 99 kPa (14 psi) | 69 kPa (10 psi) | 39 kPa (6 psi) | 62 kPa (9 psi) |
| Average Range: 47-87 kPa (6.8-12.6 psi) | Replace fuel injector - too much fuel pressure drop | Injector OK | Replace fuel injector - too little fuel pressure drop | Injector OK |
Fuel Injector Balance Test Example (Actual Results May Vary)
The number below refers to the step number on the diagnostic table.
- 3: The engine coolant temperature (ECT) must be below the operating temperature in order to avoid irregular fuel pressure readings due to hot soak fuel boiling.
| Step | Action | Values | Yes | No |
|---|
| 1 | Did you perform the Diagnostic System Check - Vehicle? | | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
| 2 | Did you perform the Fuel Injector Coil Test? | | Go to Step 3 | Go to Fuel Injector Coil Test |
| 3 | IMPORTANT: DO NOT perform this test if the engine coolant temperature (ECT) is above 94°C (201°F). Observe the ECT Sensor parameter with a scan tool.Is the ECT Sensor parameter less than the specified value? | 94°C (201°F) | Go to Step 4 | |
| 4 | IMPORTANT: Verify that adequate fuel is in the fuel tank before proceeding with this diagnostic. Turn OFF the ignition. Turn OFF all accessories. Install the fuel pressure gage. Refer to Fuel Pressure Gage Installation and Removal . Turn ON the ignition, with the engine OFF. IMPORTANT: The fuel pump relay may need to be commanded ON a few times in order to obtain the highest possible fuel pressure. DO NOT start the engine. Command the fuel pump relay ON with a scan tool. Observe the fuel pressure gage, with the fuel pump operating. Is the fuel pressure within the specified value? | 345-414 kPa (50-60 psi) | Go to Step 5 | Go to Fuel System Diagnosis |
| 5 | IMPORTANT: The fuel pressure may vary slightly when the fuel pump stops operating. After the fuel pump stops operating, the fuel pressure should stabilize and remain constant. Monitor the fuel pressure gage for 5 minutes.Does the fuel pressure decrease by more than the specified value? | 55 kPa (8 psi) | Go to Fuel System Diagnosis | Go to Step 6 |
| 6 | NOTE: Do Not repeat any portion of this test before running the engine in order to prevent the engine from flooding. Select the Fuel Injector Balance Test function, within the Special Functions menu, with a scan tool. Select an injector to be tested. Press Enter. This will prime the fuel system. Record the fuel pressure indicated by the fuel pressure gage after the fuel pressure stabilizes. This is the 1st pressure reading. IMPORTANT: Record the fuel pressure value immediately after the fuel injector stops pulsing. The fuel pressure may rise after the fuel injector stops pulsing. DO NOT record the higher fuel pressure value. Energize the fuel injector by depressing the Pulse Injector button on the scan tool. This will energize the injector and decrease the fuel pressure. Record the fuel pressure indicated by the fuel pressure gage after the fuel injector has stopped pulsing. This is the 2nd pressure reading. Press Enter again to bring you back to the Select Injector screen. Repeat for each fuel injector. Subtract the 2nd pressure reading from the 1st pressure reading for one fuel injector. The result is the pressure drop value. Obtain a pressure drop value for each fuel injector. Add all of the individual pressure drop values. This is the total pressure drop. Divide the total pressure drop by the number of fuel injectors. This is the average pressure drop. Is the difference between any individual pressure drop and the average pressure drop more than the specified value? | 20 kPa (3 psi) | Go to Step 7 | Go to Symptoms - Engine Controls |
| 7 | Replace the fuel injectors. Refer to Fuel Injector Replacement . Did you complete the replacement? | | Go to Step 8 | |
| 8 | Operate the system in order to verify the repair. Did you correct the condition? | | System OK | Go to Symptoms - Engine Controls |
| IMPORTANT |
|---|
| DO NOT perform this test if the engine coolant temperature (ECT) is above 94°C (201°F). |
| IMPORTANT |
|---|
| Verify that adequate fuel is in the fuel tank before proceeding with this diagnostic. |
| IMPORTANT |
|---|
| The fuel pump relay may need to be commanded ON a few times in order to obtain the highest possible fuel pressure. DO NOT start the engine. |
| IMPORTANT |
|---|
| The fuel pressure may vary slightly when the fuel pump stops operating. After the fuel pump stops operating, the fuel pressure should stabilize and remain constant. |
| NOTE |
|---|
| Do Not repeat any portion of this test before running the engine in order to prevent the engine from flooding. |
| IMPORTANT |
|---|
| Record the fuel pressure value immediately after the fuel injector stops pulsing. The fuel pressure may rise after the fuel injector stops pulsing. DO NOT record the higher fuel pressure value. |
Fuel Injector Balance Test with Tech 2
Scheme 48
Scheme 48: Fuel Injector Circuit Diagnosis
The fuel tank leak test is used to locate any fuel or fuel vapor escaping the fuel tank area. Fuel vapors escaping above the fuel level will be detected, if more than the calibrated amount, when the evaporative emission (EVAP) diagnostics complete one test cycle. The malfunction indicator lamp (MIL) will illuminate after the EVAP diagnostics have failed two test cycles.
The numbers below refer to the step numbers on the diagnostic table.
- 4: This step tests for fuel leaks below the fuel tank fuel level.
- 5: This step tests for fuel vapors escaping above the fuel level in the fuel tank.
| Step | Action | Yes | No |
|---|
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
| 2 | CAUTION: Gasoline or gasoline vapors are highly flammable. A fire could occur if an ignition source is present. Never drain or store gasoline or diesel fuel in an open container, due to the possibility of fire or explosion. Have a dry chemical (Class B) fire extinguisher nearby. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information. Inspect the fuel tank and the fuel pipes for damage or external leaks. Did you find fuel leaking from the fuel tank? | Go to Step 6 | Go to Step 3 |
| 3 | Turn ON the ignition, with the engine OFF. Command the fuel pump relay ON with a scan tool. Inspect for fuel leaking from the fuel pipes. Did fuel leak from the fuel pipes? | Go to Step 7 | Go to Step 4 |
| 4 | Turn OFF the ignition. Install J 41413-200 Evaporative Emissions System Tester (EEST) and . Special Tools . J 41415-40 Fuel Tank Cap Adapter. Special Tools . Test for a fuel tank leak referring to the J 41413-210 Operation Manual. IMPORTANT: If the floating indicator registers any flow after stabilizing, a leak is evident. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information. Inspect for a fuel leak while the system is under pressure. Did fuel leak from the fuel tank? | Go to Step 6 | Go to Step 5 |
| 5 | Using the J 41413-200 and the J 41413-210 Operation Manual, introduce smoke into the evaporative emission (EVAP) system. Special Tools . IMPORTANT: It may be necessary to partially lower the fuel tank. Refer to Fuel Tank Replacement . Inspect for leaks in any of the following locations: The fuel tank, the fill limiter vent valve, the pressure relief valve, and the grade vent valves-Refer to Fuel Tank Replacement . The fuel pump module housing, the fuel sender seal, the fuel pipes, and the EVAP pipes-Refer to Fuel Pump Module Replacement . The fuel tank pressure (FTP) sensor seal-Refer to Fuel Tank Pressure Sensor Replacement . The fuel fill pipe and hose-Refer to Fuel Tank Filler Pipe Replacement or Fuel Tank Filler Hose Replacement . Did you find and correct the condition? | Go to Step 8 | Go to Diagnostic Aids |
| 6 | Replace the fuel tank. Refer to Fuel Tank Replacement . Did you complete the replacement? | Go to Step 8 | |
| 7 | Replace the leaking fuel pipe. Refer to Fuel Hose/Pipes Replacement - Chassis . Did you complete the replacement? | Go to Step 8 | |
| 8 | Operate the system under the condition of the customer concern in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
| CAUTION |
|---|
| Gasoline or gasoline vapors are highly flammable. A fire could occur if an ignition source is present. Never drain or store gasoline or diesel fuel in an open container, due to the possibility of fire or explosion. Have a dry chemical (Class B) fire extinguisher nearby. |
| IMPORTANT |
|---|
| If the floating indicator registers any flow after stabilizing, a leak is evident. |
| IMPORTANT |
|---|
| It may be necessary to partially lower the fuel tank. Refer to Fuel Tank Replacement . |
Water contamination in the fuel system may cause driveability conditions such as hesitation, stalling, no start, or misfires in one or more cylinders. Water may collect near a single fuel injector at the lowest point in the fuel injection system and cause a misfire in that cylinder. If the fuel system is contaminated with water, inspect the fuel system components for rust or deterioration.
Ethanol concentrations of greater than 10 percent can cause driveability conditions and fuel system deterioration. Fuel with more than 10 percent ethanol could result in driveability conditions such as hesitation, lack of power, stalling, or no start. Excessive concentrations of ethanol used in vehicles not designed for it may cause fuel system corrosion, deterioration of rubber components, and fuel filter restriction.
Water contamination in the fuel system may cause driveability conditions such as hesitation, stalling, no start, or misfires in one or more cylinders. Water may collect near a single fuel injector at the lowest point in the fuel injection system, and cause a misfire in that cylinder. If the fuel system is contaminated with water, inspect the fuel system components for rust or deterioration.
Ethanol concentrations of greater than 10 percent can cause driveability conditions and fuel system deterioration. Fuel with more than 10 percent ethanol could result in driveability conditions such as hesitation, lack of power, stalling, or no start. Excessive concentrations of ethanol used in vehicles not designed for it may cause fuel system corrosion, deterioration of rubber components, and fuel filter restriction.
Several states require that a vehicle pass On-Board Diagnostic (OBD) System Tests and the inspection/maintenance (I/M) emission inspection in order to renew license plates. This is accomplished by viewing the I/M System Status display on a scan tool. Using a scan tool, the technician can observe the I/M System Status in order to verify that the vehicle meets the criteria that comply with the local area requirements.
The purpose of the Inspection/Maintenance (I/M) Complete System Set Procedure is to satisfy the enable criteria necessary to execute all of the I/M readiness diagnostics, and complete the trips for those particular diagnostics. When all diagnostic tests are completed, the I/M System Status indicators are set to YES. Perform this test when more than one of the I/M System Status indicators are set to NO.
The numbers below refer to the step numbers on the diagnostic table.
- 2: This step is to run the heated oxygen sensor (HO2S) heater diagnostics and initiate the EVAP System diagnostic.
- 3: This step is to run the EVAP, secondary air injection (AIR) and the oxygen sensor diagnostics. The EVAP Test begins once the engine coolant reaches a calibrated temperature. The AIR Test, if equipped, begins shortly after Closed Loop and the indicated speed is achieved. The oxygen sensor diagnostics begin once the engine is at operating temperature, in Closed Loop fuel control, and a calibrated amount of time has elapsed.
- 4: This step is to run the Catalyst Tests. This test runs during the idle period immediately following a cruise period that meets a minimum calibrated RPM and time period.
| Step | Action | Value(s) | Yes | No |
|---|
| 1 | Did you perform the Inspection/Maintenance (I/M) System Check? | | Go to Step 2 | Go to Inspection/Maintenance (I/M) System Check |
| 2 | IMPORTANT: Whenever the ignition is turned ON, ignition positive voltage is supplied to the heated oxygen sensor (HO2S) heaters. After verifying the enable criteria, turn OFF the ignition for approximately 5 minutes to allow the sensors to cool before continuing with the test. Once the engine is started, DO NOT turn the engine OFF for the remaining portion of the set procedure. Preprogram the scan tool with the vehicle information before the ignition is turned ON. Ensure the vehicle is within the Conditions for Running specified in the supporting text. Turn OFF all of the accessories, e.g., A/C, blower fan, etc. Set the vehicle parking brake. Verify the transmission is in Park for automatic transmissions and Neutral for manual transmissions. Start the engine and allow the engine to idle. Allow the engine to idle for the specified time. Is the action complete? | 2 minutes | Go to Step 3 | |
| 3 | CAUTION: Refer to Road Test Caution in Cautions and Notices. In order for the next group of tests to run, the vehicle must operate in the following conditions: Acceleration at part throttle to 89 km/h (55 mph) with this speed maintained until the engine reaches operating temperature. This may be up to 8 minutes depending on the start up coolant temperature. Continued operation under these conditions for an additional 6 minutes. Is the action complete? | | Go to Step 4 | |
| 4 | CAUTION: Refer to Road Test Caution in Cautions and Notices. In order for the next group of tests to run, the vehicle must operate in the following conditions: Acceleration at part throttle to 72-89 km/h (45-55 mph) with this speed maintained for 2 minutes. Deceleration to 0 km/h (0 mph). Engine idling for 2 minutes while the following criteria is maintained: The service brake is depressed. The automatic transmission is in drive. The manual transmission is in neutral with the clutch pedal depressed. Is the action complete? | | Go to Step 5 | |
| 5 | IMPORTANT: If only one test status indicates No, go to the I/M System DTC Table for the I/M System Set Procedure for the indicated system. Observe the I/M System Status display with a scan tool.Did all of the I/M System Status indicators update to YES? | | Go to Step 6 | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information |
| 6 | Observe the Emission Related DTC portion of the I/M System Status display with a scan tool. Does the scan tool indicate any Emission Related DTCs set? | | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information | System OK |
| IMPORTANT |
|---|
| Whenever the ignition is turned ON, ignition positive voltage is supplied to the heated oxygen sensor (HO2S) heaters. After verifying the enable criteria, turn OFF the ignition for approximately 5 minutes to allow the sensors to cool before continuing with the test. Once the engine is started, DO NOT turn the engine OFF for the remaining portion of the set procedure. |
| CAUTION |
|---|
| Refer to Road Test Caution in Cautions and Notices. |
| CAUTION |
|---|
| Refer to Road Test Caution in Cautions and Notices. |
| IMPORTANT |
|---|
| If only one test status indicates No, go to the I/M System DTC Table for the I/M System Set Procedure for the indicated system. |
Inspection/Maintenance (I/M) Complete System Set Procedure
The purpose of this procedure is to satisfy the enable criteria necessary in order to execute the inspection/maintenance (I/M) readiness diagnostics for the Catalyst System. Ensure the vehicle meets the requirements listed in Conditions for Running before performing this test. Failure to meet the necessary requirements may produce inaccurate test results.
The purpose of this procedure is to satisfy the enable criteria necessary in order to execute the inspection/maintenance (I/M) readiness diagnostics for the Evaporative Emission (EVAP) System. Ensure the vehicle meets the requirements listed in Conditions for Running before performing this test. Failure to meet the necessary requirements may produce inaccurate test results.
The purpose of this procedure is to satisfy the enable criteria necessary in order to execute the inspection/maintenance (I/M) readiness diagnostics for the Oxygen Sensor/Heated Oxygen Sensor (O2S/HO2S) System. Ensure the vehicle meets the requirements listed in Conditions for Running before performing this test. Failure to meet the necessary requirements may produce inaccurate test results.
The purpose of this procedure is to satisfy the enable criteria necessary in order to execute the inspection/maintenance (I/M) readiness diagnostics for the Heated Oxygen Sensor (HO2S) Heater System. Ensure the vehicle meets the requirements listed in Conditions for Running before performing this test. Failure to meet the necessary requirements may produce inaccurate test results.
