Fuel and Emissions Systems Acura TL III

Scheme 1

Intermittent Failures

The term "intermittent failure" means a system may have had a failure, but it checks OK now. If the malfunction indicator lamp (MIL) on the dash does not come on, check for poor connections or loose pins at all connectors related to the circuit that you are troubleshooting. If the MIL was on but then went out, the original problem may have been intermittent.

Opens and Shorts

"Open" and "Short" are common electrical terms. An open is a break in a wire or at a connection. A short is an accidental connection of a wire to ground or to another wire. In simple electronics, this usually means something won't work at all. With complex electronics (such as ECMs and PCMs) this can sometimes mean something works, but not the way it's supposed to.

How to Use the HDS (Honda Diagnostic System)

If the MIL (Malfunction Indicator Lamp) has come on

Scheme 2

Scheme 3

1. Start the engine and check the MIL (A). NOTE: If the ignition switch is turned ON (II), and the engine is not started, the MIL will stay on for 15-20 seconds (see «HOW TO SET READINESS CODES»(/acura/tl/iii-2003-2006/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
2. If the MIL stays on, connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
3. Turn the ignition switch ON (II).
4. Check the diagnostic trouble code (DTC) and note it. Also check the freeze data and/or on-board snapshot data, and download any data found. Then refer to the indicated DTCs Troubleshooting and begin the appropriate troubleshooting procedure. NOTE: Freeze data indicates the engine conditions when the first malfunction, misfire, or fuel trim malfunction was detected. The HDS can read the DTC, freeze data, current data, and other engine control module (ECM) powertrain control module (PCM) data. For specific operations, refer to the user's manual that came with the HDS.
5. If no DTCs are found, go to MIL troubleshooting «2004-2005 MODELS»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) , «2006 MODEL»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system) ).

If the MIL did not stay on

If the MIL did not stay on but there is a driveability problem, do the symptom troubleshooting.

If you can't duplicate the DTC

Some of the troubleshooting requires you to reset the ECM/PCM and try to duplicate the DTC. If the problem is intermittent and you can't duplicate the code, do not continue through the procedure. To do so will only result in confusion, and possibly, a needlessly replaced ECM/PCM.

HDS Clear Command

The ECM/PCM stores various specific data to correct the system even if there is no electrical power such as when the battery negative terminal or No. 8 Fl ECU (ECM/PCM) (15 A) fuse are disconnected. Stored data based on failed parts should be cleared by using the "CLEAR COMMAND" of the HDS, if parts are replaced.

The HDS has three kinds of clear commands to meet this purpose. They are DTC clear, ECM/PCM reset, and CKP pattern clear. The DTC clear command erases all stored DTC codes, the freeze data, the on-board snapshot, and the readiness codes. This must be done with the HDS after reproducing the DTC during troubleshooting. The ECM/PCM reset command erases all stored DTC codes, freeze data, on-board snapshot, readiness codes, and all specific data to correct system except CKP pattern. If the CKP pattern data in the ECM/PCM was cleared, you must do the CKP pattern learn procedure. The CKP pattern clear command erases only CKP pattern data. This command is for repair of a misfire or the CKP sensor.

Scan Tool Clear Command

If you are using a generic scan tool to clear commands, be aware that there is only one setting for clearing the ECM/PCM, and it clears all commands at the same time (CKP pattern learn, idle learn, readiness codes, freeze data, on-board snapshot, and DTCs). After you clear all commands, you then need to do these procedures, in this order: ECM/PCM IDLE LEARN PROCEDURE ; CKP pattern learn procedure; Test-drive to set readiness codes to complete (see HOW TO SET READINESS CODES ).

DTC Clear

1. Clear the DTC with the HDS when the engine is stopped.
2. Turn the ignition switch OFF.
3. Turn the ignition switch ON (II), and wait for 30 seconds.
4. Turn the ignition switch OFF, and disconnect the HDS from the DLC.

ECM/PCM Reset

1. Reset the ECM/PCM with the HDS when the engine is stopped.
2. Turn the ignition switch OFF.
3. Turn the ignition switch ON (II), and wait for 30 seconds.
4. Turn the ignition switch OFF, and disconnect the HDS from the DLC.
5. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .

Scheme 4

1. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
2. Turn the ignition switch ON (II).
3. Make sure the HDS communicates with the ECM/PCM. If it doesn't, go to the «DLC CIRCUIT TROUBLESHOOTING»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) .
4. Select CRANK PATTERN in the ADJUSTMENT MENU with the HDS.
5. Select CRANK PATTERN LEARNING with the HDS, and follow the screen prompts.
6. The crank pattern learn procedure is complete.

Learn Procedure (without the HDS)

1. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on.
2. Test-drive the vehicle on a level road: Decelerate (with the throttle fully closed) from an engine speed of 2,500 rpm down to 1,000 rpm with the A/T in L position, or M/T in 1st gear.
3. Test-drive the vehicle on a level road: Decelerate (with the throttle fully closed) from an engine speed of 5,000 rpm down to 3,000 rpm with the A/T in L position, or M/T in 1st gear.
4. Repeat step 2 and 3 several times.
5. Turn the ignition switch OFF.
6. Turn the ignition switch ON (II), and wait for 30 seconds. The crank pattern learn procedure is complete.

How to End a Troubleshooting Session (required after any troubleshooting)

1. Reset the ECM/PCM with the HDS.
2. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
3. Turn the ignition switch OFF.
4. Disconnect the HDS from the DLC. NOTE: The ECM/PCM is part of the immobilizer system. If you replace the ECM/PCM, it will have a different immobilizer code. In order for the engine to start, you must rewrite the immobilizer code with the HDS.

How to Troubleshoot Circuits at the ECM/PCM

Special Tools Required

Scheme 5

Scheme 6

1. Digital multimeter KS-AHM-32-003 (1) or a commercially available digital multimeter
2. Backprobe set 07SAZ-001000A (2) Connect the backprobe adapters (A) to the stacking patch cords (B), and connect the cords to a digital multimeter. Using the wire insulation as a guide for the contoured tip of the backprobe adapter, gently slide the tip into the connector from the wire side until it touches the end of the wire terminal. If you cannot get to the wire side of the connector or the wire side is sealed (A), disconnect the connector and probe the terminals (B) from the terminal side. Do not force the probe into the connector. NOTE: Do not puncture the insulation on a wire. Punctures can cause poor or intermittent electrical connections.

ECM/PCM Updating and Substitution for Testing

Special Tools Required

Honda interface module (HIM) EQS05A35570

Use this procedure when you have to substitute a known-good ECM/PCM in a troubleshooting procedure. Update the ECM/PCM only if the ECM/PCM does not have the latest software loaded.

Note. Do not turn the ignition switch OFF while updating the ECM/PCM. If you turn the ignition switch OFF before completion, the ECM/PCM can be damaged.

How to Update the ECM/PCM

Note. To ensure the latest program is installed, do an ECM/PCM update whenever a ECM/PCM is substituted or replaced. You can not update an ECM/PCM with the program it already has. It will only accept a new program. Before you update the ECM/PCM, make sure the vehicle's battery is fully charged. To prevent ECM/PCM damage, do not operate anything electrical (audio system, brakes, A/C, power windows, moonroof, door locks, etc.) during the update. If you need to diagnose the Honda interface module (HIM) because the HIM's red (#3) light came on or was flashing during the update, leave the ignition switch in the ON (II) position when you disconnect the HIM from the data link connector (DLC). This will prevent ECM/PCM damage.

Scheme 7

1. Turn the ignition switch ON (II). Do not start the engine.
2. Connect the HDS or the Honda interface module (HIM) to the data link connector (DLC) (A) located under the driver's side of the dashboard.
3. Select the INSPECTION MENU with the HDS.
4. Do the TP POSITION CHECK in the ETCS TEST.
5. Do the ECM/PCM update procedure as described on the HIM label and in the ECM/PCM update system.
6. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
7. Do the CKP pattern clear/pattern learn procedure.

Scheme 8

Scheme 9

1. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
2. Make sure the HDS communicates with the ECM/PCM. If it doesn't, skip step 3 to 5 and clean the throttle body (see «THROTTLE BODY TEST»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#intake-air-system) ) after this procedure.
3. Turn the ignition switch ON (II).
4. Select the INSPECTION MENU with the HDS.
5. Do the TP POSITION CHECK in the ETCS TEST.
6. Turn the ignition switch OFF.
7. Jump the SCS line with the HDS.
8. Pull back the carpet.
9. Remove the ducts (A).
10. Disconnect the ECM/PCM connectors (B).
11. Remove the bolts (C), then remove the ECM/PCM (D).
12. Install a known-good ECM/PCM in the reverse order of removal.
13. Open the SCS with the HDS.
14. Turn the ignition switch ON (II). NOTE: For 2005-2006 models: DTC P0630 "VIN Not Programmed or Mismatch" may be stored because the VIN has not been programmed into the ECM/PCM; ignore it, and continue this procedure.
15. 2005-2006 models: Input the VIN to the ECM/PCM with the HDS.
16. Rewrite the immobilizer code with the ECM/PCM replacement procedure in the HDS; it allows you to start the engine.
17. Reset the ECM/PCM with the HDS.
18. Do the «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iii-2003-2006/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) .
19. Do the CKP pattern clear/pattern learn procedure.

OBD Status

The OBD status shows the current system status of each DTC and all of the parameters. This function is used to see if the technician's repair was successfully finished. The results of diagnostic tests for the DTC are displayed as

1. PASSED: On board diagnosis is successfully finished.
2. FAILED: On board diagnosis has finished but failed.
3. EXECUTING: The vehicle is in enable criteria conditions for the DTC and the on board diagnosis is running.
4. NOT COMPLETED: The on board diagnosis was running but is out of the enable conditions of the DTC.
5. OUT OF CONDITION: The vehicle has stayed out of the enable conditions of the DTC.

DTC Troubleshooting Index

DTC TROUBLESHOOTING INDEX

DTC TROUBLESHOOTING INDEX

DTC TROUBLESHOOTING INDEX

DTC TROUBLESHOOTING INDEX

DTC TROUBLESHOOTING INDEX

DTC TROUBLESHOOTING INDEX

DTC TROUBLESHOOTING INDEX

DTC TROUBLESHOOTING INDEX

Symptom Troubleshooting Index

When the vehicle has one of these symptoms, check for a diagnostic trouble code (DTC) with the HDS. If there is no DTC, do the diagnostic procedure for the symptom, in the sequence listed, until you find the cause.

SYMPTOM TROUBLESHOOTING INDEX

Electronic Control System

The functions of the fuel and emission control systems are managed by the engine control module (ECM) on vehicles with manual transmission, or the powertrain control module (PCM) on vehicles with automatic transmissions.

Self-diagnosis

The ECM/PCM detects a failure of a signal from a sensor or from another control unit and stores a Temporary DTC or a DTC in erasable memory (RAM). Depending on the failure, a DTC is stored in the first or the second drive cycle. When a DTC is stored, the ECM/PCM turns on the malfunction indicator lamp (MIL) by supplying ground to the MIL circuit.

1. One Drive Cycle Detection Method When an abnormality occurs in the signal from a sensor or from another control unit, the ECM/PCM stores a DTC for the failure in the RAM and turns on the MIL immediately.
2. Two Drive Cycle Detection Method When an abnormality occurs in the signal from a sensor or from another control unit in first drive cycle, the ECM/PCM stores a Temporary DTC for the failure in RAM. The MIL does not come on at this time. If the failure continues in the second drive cycle, the ECM/PCM stores a DTC in erasable memory and turns on the MIL.

Fail-safe Function

When an abnormality occurs in the signal from a sensor or from another control unit, the ECM/PCM ignores that signal and assumes a pre-programmed value that allows the engine to continue running. This causes a DTC to be stored and the MIL to come on.

MIL Bulb Check and Readiness Code Condition

When the ignition switch is turned ON (II), the ECM/PCM supplies ground to the MIL circuit for about 15 to 20 seconds to check the bulb condition. If any readiness codes are not set to complete, the MIL flashes five times. If all readiness codes are set to complete, the MIL goes off.

Self Shut Down (SSD) Mode

After the ignition switch is turned OFF, the ECM/PCM stays on (up to 15 minutes). If the ECM/PCM connector is disconnected during this time, the ECM/PCM may be damaged. To cancel this mode, disconnect the negative cable from the battery or jump the SCS line with the HDS after the ignition switch is turned OFF.

Scheme 10

Scheme 11

Scheme 12

Scheme 13

Scheme 14

Scheme 15

Scheme 16

Scheme 17

Scheme 18

Scheme 19

Scheme 20

Scheme 21

Scheme 22

Scheme 23

Scheme 24

Scheme 25

Scheme 26

Scheme 27

Scheme 28

Scheme 29

Scheme 30

Scheme 31

Scheme 32

Scheme 33

Scheme 34

Scheme 35

Scheme 36

Scheme 37

Scheme 38

PGM-FI System

The programmed fuel injection (PGM-FI) system is a sequential multiport fuel injection system.

Air Conditioning (A/C) Compressor Clutch Relay

When the ECM/PCM receives a demand for cooling from the A/C system, it delays the compressor from being energized, and enriches the mixture to assure smooth transition to the A/C mode.

Alternator Control

The alternator signals the ECM/PCM during charging.

Air Fuel Ratio (A/F) Sensor

The A/F sensor operates over a wide air/fuel range. The A/F sensor is installed upstream of the WU-TWC, and sends signals to the ECM/PCM which varies the duration of fuel injection accordingly.

Scheme 39

Barometric Pressure (BARO) Sensor

The BARO sensor is inside the ECM/PCM. It converts atmospheric pressure into a voltage signal that is used by the ECM/PCM to modify the basic duration of the fuel injection discharge.

Camshaft Position (CMP) Sensor

The CMP sensor input is used by the ECM/PCM to determine ignition timing at start up (cranking) and when crank angle is abnormal.

Scheme 40

Crankshaft Position (CKP) Sensor

The CKP sensor detects crankshaft speed and is used by the ECM/PCM to determine ignition timing and timing for fuel injection of each cylinder as well as detecting engine misfire.

Scheme 41

Engine Coolant Temperature (ECT) Sensor

The ECT sensor is a temperature dependent resistor (thermistor). The resistance of the thermistor decreases as the engine coolant temperature increases.

Scheme 42

Ignition Timing Control

The ECM/PCM contains the memory for basic ignition timing at various engine speeds and manifold absolute pressures. It also adjusts the timing according to engine coolant temperature.

Injector Timing and Duration

The ECM/PCM contains the memory for basic discharge duration at various engine speeds and manifold pressures. The basic discharge duration, after being read out from the memory, is further modified by signals sent from various sensors to obtain the final discharge duration.

By monitoring long term fuel trim, the ECM/PCM detects long term malfunctions in the fuel system and sets a diagnostic trouble code (DTC).

Input Shaft (Mainshaft) Speed Sensor

This sensor detects input shaft (mainshaft) speed.

Scheme 43

Intake Air Temperature (IAT) Sensor

The IAT sensor is a temperature dependent resistor (thermistor). The resistance of the thermistor decreases as the intake air temperature increases.

Scheme 44

Knock Sensor

The knock control system adjusts the ignition timing to minimize knock.

Scheme 45

Malfunction Indicator Lamp (MIL) Indication (In relation to Readiness Codes)

The vehicle has certain "readiness codes" that are part of the on-board diagnostics for the emissions systems. If the vehicle's battery has been disconnected or gone dead, if the DTCs have been cleared, or if the ECM/PCM has been reset, these codes are reset. In some states, part of the emissions testing is to make sure these codes are set to complete. If all of them are not set to complete, the vehicle may fail the test, or the test cannot be finished.

To check if the readiness codes are set to complete, turn the ignition switch ON (II), but do not start the engine. The MIL will come on for 15-20 seconds. If it then goes off, the readiness codes are complete. If it flashes five times, one or more readiness codes are not complete. To set each code, drive the vehicle or run the engine as described in how to set readiness codes (see HOW TO SET READINESS CODES ).

Manifold Absolute Pressure (MAP) Sensor

The MAP sensor converts manifold absolute pressure into electrical signals to the ECM/PCM.

Scheme 46

Output Shaft (Countershaft) Speed Sensor

This sensor detects output shaft (countershaft) speed.

Scheme 47

Secondary Heated Oxygen Sensor (Secondary HO2S)

The secondary HO2S detects the oxygen content in the exhaust gas downstream of the warm up three way catalytic converter (WU-TWC), and sends signals to the ECM/PCM. To stabilize its output, the sensor has an internal heater. The ECM/PCM compares the HO2S output with the A/F sensor output to determine catalyst efficiency. The secondary HO2S is on the WU-TWC.

Scheme 48

Electronic Throttle Control System

The throttle is electronically controlled by the electronic throttle control system. Refer to the system diagram to see the functional layout of the system.

Idle control: When the engine is idling, the ECM/PCM controls the throttle actuator to maintain the proper idle speed according to engine loads. Acceleration control: When the accelerator pedal is pressed, the ECM/PCM opens the throttle valve depending on the accelerator pedal position (APP) sensor signal.

Cruise control: The ECM/PCM controls the throttle actuator to maintain set speed when the cruise control is operating. The throttle actuator takes the place of the cruise control actuator.

Accelerator Pedal Position (APP) Sensor

As the accelerator pedal position changes, the sensor varies the signal voltage to the ECM/PCM.

Scheme 49

Scheme 50

Throttle Body

The throttle body is a single-barrel side draft type. The lower portion of the throttle valve is heated by engine coolant from the cylinder head to prevent icing of the throttle plate.

Scheme 51

Idle Control System

When the engine is cold, the A/C compressor is on, the transmission is in gear, the brake pedal is pressed, the power steering load is high, or the alternator is charging, the ECM/PCM controls current to the throttle actuator to maintain the correct idle speed.

Brake Pedal Position Switch

The brake pedal position switch signals the ECM/PCM when the brake pedal is pressed.

Power Steering Pressure (PSP) Switch

The PSP switch signals the ECM/PCM when the power steering load is high.

Fuel Cut-off Control

During deceleration with the throttle valve closed, current to the injectors is cut off to improve fuel economy at engine speeds over 950 rpm (M/T: 1,050 rpm). Fuel cut-off control also occurs when the engine speed exceeds 6,900 rpm, regardless of the position of the throttle valve, to protect the engine from over-revving. When the vehicle is stopped, the ECM/PCM cuts the fuel at engine speeds over 5,000 rpm. Engine speed of fuel cut is lower on a cold engine.

Fuel Pump Control

When the ignition is turned on, the ECM/PCM grounds PGM-FI main relay 2 (FUEL PUMP) which feeds current to the fuel pump for 2 seconds to pressurize the fuel system. With the engine running, the ECM/PCM grounds PGM-FI main relay 2 (FUEL PUMP) and feeds current to the fuel pump. When the engine is not running and the ignition is on, the ECM/PCM cuts ground to PGM-FI main relay 2 (FUEL PUMP) which cuts current to the fuel pump.

PGM-FI Main Relay 1 (Fl MAIN) and 2 (FUEL PUMP)

PGM-FI main relay 1 (Fl MAIN) is energized whenever the ignition switch is ON (II) to supply battery voltage to the ECM/PCM, power to the injectors, and power for PGM-FI main relay 2 (FUEL PUMP). PGM-FI main relay 2 (FUEL PUMP) is energized to supply power to the fuel pump for 2 seconds when the ignition switch is turned ON (II), and when the engine is cranking or running.

Catalytic Converter System

Warm Up Three Way Catalytic Converter (WU-TWC) and Three Way Catalytic Converter (TWC)

The WU-TWC/TWC converts hydrocarbons (HC), carbon monoxide (CO), and oxides of nitrogen (NOx) in the exhaust gas to carbon dioxide (CO 2 ), nitrogen (N 2 ), and water vapor.

WU-TWC

Scheme 52

TWC

Scheme 53

Exhaust Gas Recirculation (EGR) System

Refer to the system diagram to see a functional layout of the system.

EGR Valve

The EGR valve lowers peak combustion temperatures and reduces oxides of nitrogen emissions (NOx) by recirculating exhaust gas through the intake manifold and into the combustion chambers.

Positive Crankcase Ventilation (PCV) System

The PCV valve prevents blow-by gasses from escaping into the atmosphere by venting them into the intake manifold.

Scheme 54

Evaporative Emission (EVAP) Control System

Refer to the system diagram to see the functional layout of the system.

EVAP Canister

The EVAP canister temporarily stores fuel vapor from the fuel tank until it can be purged from the EVAP canister into the engine and burned.

EVAP Canister Purge Valve

When the engine coolant temperature is below 149°F (65°C), the ECM/PCM turns off the EVAP canister purge valve which cuts vacuum to the EVAP canister.

Fuel Tank Pressure (FTP) Sensor

The FTP sensor converts fuel tank absolute pressure into an electrical input to the ECM/PCM during the EVAP leak check.

Scheme 55

EVAP Canister Vent Shut Valve

The EVAP canister vent shut valve is on the EVAP canister.

The EVAP canister vent shut valve controls the venting of the EVAP canister.

Scheme 56

Fuel Cap Warning Message (2004 Model)

The ECM/PCM detects whether the fuel fill cap is loose or missing under certain conditions and alerts the driver by showing the information in the multi-information display.

First Drive Cycle

During the first drive cycle after a cold start, the ECM/PCM stores Temporary DTC P0457 "Evaporative Emission (EVAP) System Leak Detected/Fuel Fill Cap Loose or Missing" if the fuel cap is loose or missing, but no indicator comes on, and no message is shown in the multi-information display (A).

Scheme 57

Second Drive Cycle

During the second drive cycle after a cold start, if the fuel fill cap is still loose or missing, the ECM/PCM alerts the driver to check the fuel fill cap by showing a "CHECK FUEL CAP" message in the multi-information display. Tightening the fuel cap does not make the message go off immediately.

Scheme 58

Procedure

1. Tighten the fuel fill cap three clicks.
2. Clear the Temporary DTC with the HDS.
3. Verify there is no leak by doing the EVAP FUNCTION TEST in the INSPECTION MENU with the HDS.

1. Tighten the fuel fill cap three clicks.
2. Turn the ignition switch OFF.
3. Start the engine, and drive at a steady speed over 28 mph (45 km/h), without moving the accelerator pedal, for about 1 minute. Do this several times.

Third Drive Cycle

During the third drive cycle after a cold start, if the fuel fill cap is still loose or missing, the ECM/PCM stores DTC P0457 "Evaporative Emission (EVAP) System Leak Detected/Fuel Fill Cap Loose or Missing". The malfunction indicator lamp (MIL) (A) comes on, and the "CHECK FUEL CAP" message goes off.

Scheme 59

Fuel Cap Warning Message (2005-2006 Models)

The ECM/PCM detects whether the fuel fill cap is loose or missing under certain conditions and alerts the driver by showing the information in the multi-information display. If the ECM/PCM detects a small volume leak, the MIL may come on during the third drive cycle and store a DTC.

During the first drive cycle after a cold start, the ECM/PCM alerts the driver to check the fuel fill cap by showing a "CHECK FUEL CAP" (2005 model) ("TIGHTEN FUEL CAP" (2006 model)) message in the multi-information display (A), and it stores Temporary DTC P0457 "Evaporative Emission (EVAP) System Leak Detected/Fuel Fill Cap Loose or Missing". Tightening the fuel cap does not make the message go off immediately.

2005 model

Scheme 60

2006 model

Scheme 61

1. Tighten the fuel fill cap one click.
2. Clear the Temporary DTC with the HDS.
3. Verify there is no leak by doing the EVAP FUNCTION TEST in the INSPECTION MENU with the HDS.

1. Tighten the fuel fill cap one click.
2. Turn the ignition switch OFF.
3. Start the engine, and drive at a steady speed over 28 mph (45 km/h), without moving the accelerator pedal, for about 1 minute. Do this several times.

During the second drive cycle after a cold start, if the fuel fill cap is still loose or missing, the ECM/PCM alerts the driver to check the fuel fill cap by showing a "CHECK FUEL CAP" (2005 model) ("TIGHTEN FUEL CAP" (2006 model)) message in the multi-information display. Tightening the fuel cap does not make the message go off immediately.

During the third drive cycle after a cold start, if the fuel fill cap is still loose or missing, the ECM/PCM stores DTC P0457 "Evaporative Emission (EVAP) System Leak Detected/Fuel Fill Cap Loose or Missing". The malfunction indicator lamp (MIL) (A) comes on, and the "CHECK FUEL CAP" (2005 model) ("TIGHTEN FUEL CAP" (2006 model)) message goes off.

Scheme 62

Electronic Throttle Control System Diagram

The electronic throttle control system consists of the throttle actuator, throttle position (TP) sensor A/B, accelerator pedal position (APP) sensor A/B, throttle actuator control module, and the ECM/PCM. The throttle is electronically controlled by this system.

Scheme 63

Intake Manifold Tuning (IMT) Valve System

Engine power is adjusted by opening and closing the intake manifold tuning (IMT) actuator. When the valve is closed, there is high torque at low engine speed. When the valve is open, there is high torque at high engine speed. The intake manifold tuning (IMT) valve actuator has a sensor that detects the IMT valve position and sends the position signal to the ECM/PCM.

Scheme 64

Exhaust Gas Recirculation (EGR) System Diagram

The EGR system reduces oxides of nitrogen (NOx) emissions by recirculating exhaust gas through the EGR valve and the intake manifold into the combustion chambers. The ECM/PCM memory contains the ideal EGR valve position for various operating conditions.

The EGR valve position sensor detects the amount of EGR valve lift and sends it to the ECM/PCM. The ECM/PCM then compares it with the ideal lift in its memory (based on signals sent from other sensors). If there is any difference between the two, the ECM/PCM cuts current to the EGR valve.

Scheme 65

Evaporative Emission (EVAP) Control Diagram

The EVAP controls minimize the amount of fuel vapor escaping to the atmosphere. Vapor from the fuel tank is temporarily stored in the EVAP canister until it can be purged from the canister into the engine and burned.

Scheme 66

1. The EVAP canister is purged by drawing fresh air through it and into a port on the intake manifold. The purging vacuum is controlled by the EVAP canister purge valve, which operates whenever engine coolant temperature is above 149°F (65°C).
2. During refueling, the fuel tank vapor control valve opens with the pressure in the fuel tank, and feeds the fuel vapor to the EVAP canister.

Scheme 67

Scheme 68

Scheme 69

Scheme 70

Scheme 71

Scheme 72

Scheme 73

Scheme 74

Scheme 75

Scheme 76

Scheme 77

Scheme 78

Scheme 79

Scheme 80

Scheme 81

Scheme 82

Scheme 83

Scheme 84

Scheme 85

Scheme 86

Scheme 87

Scheme 88

The vehicle has certain "readiness codes" that are part of the on-board diagnostics for the emissions systems. If the vehicle's battery has been disconnected or gone dead, if the DTCs have been cleared, or if the ECM/PCM has been reset, these readiness codes are reset. In some states, part of the emissions testing is to make sure these codes are set to complete. If all of them are not set to complete, the vehicle may fail the emission test, or the test cannot be finished.

To check if the readiness codes are set to complete, turn the ignition switch ON (II), but do not start the engine. The MIL will come on for 15-20 seconds. If it then goes off, the readiness codes are complete. If it flashes five times, one or more readiness codes are not set to complete. To set readiness codes from incomplete to complete, do the procedure for the appropriate code.

To check the status of a specific DTC system, check the OBD status in the DTC MENU with the HDS (see OBD STATUS ). This screen displays the code, the current data list of the enable criteria, and the status of the readiness testing.

Catalytic Converter Monitor and Readiness Code

Note. Do not turn the ignition switch off during the procedure. All readiness codes are cleared when the battery is disconnected, if the DTCs have been cleared, or if the ECM/PCM is reset with the HDS. Low ambient temperatures or excessive stop-and-go traffic may increase the drive time needed to switch the readiness code from incomplete to complete. The readiness code will not switch to complete until all the enable criteria are met. If a fault in the secondary HO2S system caused the MIL to come on, the readiness code cannot be set to complete until you correct the fault.

Enable Criteria

1. ECT at 158°F (70°C) or higher.
2. Intake air temperature (IAT) at 20°F (-7°C) or higher.
3. Vehicle speed sensor (VSS) reads more than 25 mph (40 km/h).

1. Connect the HDS to the vehicle's data link connector (DLC), and bring up the READINESS Codes screen for Catalyst in the DTCs MENU.
2. Start the engine.
3. Test-drive the vehicle under stop-and-go conditions with short periods of steady cruise. After about 5 miles (8 km), the readiness code should switch to complete.
4. If the readiness code is still not set to complete, check for a Temporary DTC with the HDS. If there is no DTC, one or more of the enable criteria were probably not met; repeat the procedure.

Evaporative Emission (EVAP) Control System Monitor and Readiness Code

Note. All readiness codes are cleared when the battery is disconnected, if the DTCs have been cleared, or if the ECM/PCM is reset with the HDS.

1. Battery voltage is higher than 10.5 V.
2. Engine at idle.
3. ECT sensor between 176°F (80°C) and 212°F (100°C).
4. MAP sensor less than 46.6 kPa (14 in.Hg, 350 mmHg).
5. Vehicle speed 0 mph (0 km/h).
6. IAT sensor between 32°F (0°C) and 212°F (100°C).

1. Connect the HDS to the vehicle's data link connector (DLC).
2. Start the engine.
3. Select EVAP TEST in the INSPECTION MENU with the HDS, then select the FUNCTION TEST in the EVAP TEST MENU. If the result is normal, readiness is complete. If the result is not normal, go to the next step.
4. Check for a Temporary DTC. If there is no DTC, one or more of the enable criteria were probably not met; repeat the procedure.

Air Fuel Ratio (A/F) Sensor Monitor and Readiness Code

Note. Do not turn the ignition switch off during the procedure. All readiness codes are cleared when the battery is disconnected, if the DTCs have been cleared, or if the ECM/PCM is reset with the HDS.

ECT at 140°F (60°C) or higher. Procedure

1. Start the engine.
2. Test-drive the vehicle under stop-and-go conditions with short periods of steady cruise. During the drive, decelerate (with the throttle fully closed) for 5 seconds. After about 3.5 miles (5.6 km), the readiness code should switch from incomplete to complete.
3. Check the readiness codes screen for the AIR FUEL RATIO (A/F) SENSOR in the DTCs MENU with the HDS. If the screen shows complete, readiness is complete. If the screen shows not complete, go to the next step.
4. Check for a Temporary DTC. If there is no DTC, the enable criteria was probably not met. Select the DATA LIST Menu. Check the ECT in the ALL DATA LIST with the HDS. If the ECT is lower than 140°F (60°C), run the engine until it is higher than 140°F (60°C), then repeat the procedure.

Air Fuel Ratio (A/F) Sensor Heater Monitor Readiness Code

Note. All readiness codes are cleared when the battery is disconnected, if the DTCs have been cleared, or if the ECM/PCM is reset with the HDS.

1. Start the engine, and let it idle 1 minute. The readiness code should switch from incomplete to complete.
2. If the readiness code is still not set to complete, check for a Temporary DTC. If there is no DTC, repeat the procedure.

Misfire Monitor and Readiness Code

1. This readiness code is always set to available because misfiring is continuously monitored.
2. Monitoring pauses, and the misfire counter resets, if the vehicle is driven over a rough road.
3. Monitoring also pauses, and the misfire counter holds at its current value, if the throttle position changes more than a predetermined value, or if driving conditions fall outside the range of any related enable criteria.

Fuel System Monitor and Readiness Code

1. This readiness code is always set to available because the fuel system is continuously monitored during closed loop operation.
2. Monitoring pauses when the catalytic converter, EVAP control system, and A/F sensor monitors are active.
3. Monitoring also pauses when any related enable criteria are not being met. Monitoring resumes when the enable criteria is again being met.

Comprehensive Component Monitor and Readiness Code

This readiness code is always set to available because the comprehensive component monitor is continuously running whenever the engine is cranking or running.

EGR Monitor and Readiness Code

Note. Do not turn the ignition switch off during the procedure. All readiness codes are cleared when the battery is disconnected, if the DTCs have been cleared, or if the ECM/PCM is reset with the HDS.

ECT at 176°F (80°C) or higher.

1. Connect the HDS to the vehicle's data link connector (DLC).
2. Start the engine.
3. Drive at a steady speed with the A/T in D position or M/T in 4th gear, 50-62 mph (80-100 km/h) or above for more than 10 seconds.
4. With the A/T in D position or M/T in 4th gear, decelerate from 62 mph (100 km/h) or above by completely releasing the throttle for at least 5 seconds. If the engine is stopped during this procedure, go to step 3 and do the procedure again.
5. Check the OBD status screen for DTC P0401 in the DTCs MENU with the HDS. If it is passed, readiness is complete. If it is not passed, go to step 3 and retest.

See also:
• 2004-2005 MODELS
• ECM/PCM IDLE LEARN PROCEDURE
• DLC CIRCUIT TROUBLESHOOTING
• THROTTLE BODY TEST
• DTC P0107: MAP SENSOR CIRCUIT LOW VOLTAGE (2004-2005 MODELS)
• DTC P0108: MAP SENSOR CIRCUIT HIGH VOLTAGE (2004-2005 MODELS)
• DTC P0111: IAT SENSOR CIRCUIT RANGE/PERFORMANCE PROBLEM (2006 MODEL), DTC P1116: ECT SENSOR CIRCUIT RANGE/PERFORMANCE PROBLEM (2006 MODEL)
• DTC P0112: IAT SENSOR CIRCUIT LOW VOLTAGE
• DTC P0113: IAT SENSOR CIRCUIT HIGH VOLTAGE (2004-2005 MODELS)
• DTC P0116: ECT SENSOR CIRCUIT RANGE/PERFORMANCE PROBLEM (2004-2005 MODELS)
• DTC P0117: ECT SENSOR CIRCUIT LOW VOLTAGE
• DTC P0118: ECT SENSOR CIRCUIT HIGH VOLTAGE (2004-2005 MODELS)
• DTC P0122: TP SENSOR A CIRCUIT LOW VOLTAGE
• DTC P0123: TP SENSOR A CIRCUIT HIGH VOLTAGE
• DTC P0125: ECT SENSOR MALFUNCTION/SLOW RESPONSE (2004-2005 MODELS)
• DTC P0128: COOLING SYSTEM MALFUNCTION
• DTC P0133: REAR A/F SENSOR (BANK 1, SENSOR 1) SLOW RESPONSE (2004 MODEL), DTC P0153: FRONT A/F SENSOR (BANK 2, SENSOR 1) SLOW RESPONSE (2004 MODEL)
• DTC P0134: REAR A/F SENSOR (BANK 1, SENSOR 1) HEATER SYSTEM MALFUNCTION (2004-2005 MODELS), DTC P0154: FRONT A/F SENSOR (BANK 2, SENSOR 1) HEATER SYSTEM MALFUNCTION (2004-2005 MODELS)
• DTC P0135: REAR A/F SENSOR (BANK 1, SENSOR 1) HEATER CIRCUIT MALFUNCTION (2004-2005 MODELS), DTC P0155: FRONT A/F SENSOR (BANK 2, SENSOR 1) HEATER CIRCUIT MALFUNCTION (2004-2005 MODELS)
• DTC P0137: REAR SECONDARY HO2S (BANK 1, SENSOR 2) CIRCUIT LOW VOLTAGE (2004 MODEL), DTC P0157: FRONT SECONDARY HO2S (BANK 2, SENSOR 2) CIRCUIT LOW VOLTAGE (2004 MODEL)
• DTC P0138: REAR SECONDARY HO2S (BANK 1, SENSOR 2) CIRCUIT HIGH VOLTAGE (2004 MODEL), DTC P0158: FRONT SECONDARY HO2S (BANK 2, SENSOR 2) CIRCUIT HIGH VOLTAGE (2004 MODEL)
• DTC P0139: REAR SECONDARY HO2S (BANK 1, SENSOR 2) SLOW RESPONSE (2004 MODEL), DTC P0159: FRONT SECONDARY HO2S (BANK 2, SENSOR 2) SLOW RESPONSE (2004 MODEL)
• DTC P0141: REAR SECONDARY HO2S (BANK 1, SENSOR 2) HEATER CIRCUIT MALFUNCTION (2004-2005 MODELS), DTC P0161: FRONT SECONDARY HO2S (BANK 2, SENSOR 2) HEATER CIRCUIT MALFUNCTION (2004-2005 MODELS)
• DTC P0171: REAR BANK (BANK 1) FUEL SYSTEM TOO LEAN, DTC P0172: REAR BANK (BANK 1) FUEL SYSTEM TOO RICH, DTC P0174: FRONT BANK (BANK 2) FUEL SYSTEM TOO LEAN, DTC P0175: FRONT BANK (BANK 2) FUEL SYSTEM TOO RICH
• DTC P0222: TP SENSOR B CIRCUIT LOW VOLTAGE
• DTC P0223: TP SENSOR B CIRCUIT HIGH VOLTAGE
• DTC P0300: RANDOM MISFIRE AND ANY COMBINATION OF THE FOLLOWING:, DTC P0301: NO. 1 CYLINDER MISFIRE DETECTED, DTC P0302: NO. 2 CYLINDER MISFIRE DETECTED, DTC P0303: NO. 3 CYLINDER MISFIRE DETECTED, DTC P0304: NO. 4 CYLINDER MISFIRE DETECTED, DTC P0305: NO. 5 CYLINDER MISFIRE DETECTED, DTC P0306: NO. 6 CYLINDER MISFIRE DETECTED
• DTC P0301: NO. 1 CYLINDER MISFIRE DETECTED (2004-2005 MODELS), DTC P0302: NO. 2 CYLINDER MISFIRE DETECTED (2004-2005 MODELS), DTC P0303: NO. 3 CYLINDER MISFIRE DETECTED (2004-2005 MODELS), DTC P0304: NO. 4 CYLINDER MISFIRE DETECTED (2004-2005 MODELS), DTC P0305: NO. 5 CYLINDER MISFIRE DETECTED (2004-2005 MODELS), DTC P0306: NO. 6 CYLINDER MISFIRE DETECTED (2004-2005 MODELS)
• DTC P0325: KNOCK SENSOR CIRCUIT MALFUNCTION
• DTC P0335: CKP SENSOR A NO SIGNAL (2004-2005 MODELS), DTC P0385: CKP SENSOR B NO SIGNAL (2004-2005 MODELS)
• DTC P0339: CKP SENSOR A CIRCUIT INTERMITTENT INTERRUPTION, DTC P0389: CKP SENSOR B CIRCUIT INTERMITTENT INTERRUPTION
• DTC P0340: CMP SENSOR NO SIGNAL (2004-2005 MODELS)
• DTC P0344: CMP SENSOR CIRCUIT INTERMITTENT INTERRUPTION
• DTC P0401: EGR INSUFFICIENT FLOW
• DTC P0404: EGR CONTROL CIRCUIT RANGE/PERFORMANCE PROBLEM
• DTC P0406: EGR VALVE POSITION SENSOR CIRCUIT HIGH VOLTAGE (2004-2005 MODELS)
• DTC P0420: REAR BANK CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD (BANK 1); DTC P0430: FRONT BANK CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD (BANK 2)
• DTC P0442, P0456: EVAP SYSTEM SMALL LEAK DETECTED, EVAP SYSTEM VERY SMALL LEAK DETECTED
• DTC P0443: EVAP CANISTER PURGE VALVE CIRCUIT MALFUNCTION
• DTC P0451: FTP SENSOR CIRCUIT RANGE/PERFORMANCE PROBLEM
• DTC P0452: FTP SENSOR CIRCUIT LOW VOLTAGE (2004-2005 MODELS)
• DTC P0453: FTP SENSOR CIRCUIT HIGH VOLTAGE (2004-2005 MODELS
• DTC P0498: EVAP CANISTER VENT SHUT VALVE CIRCUIT LOW VOLTAGE (2004-2005 MODELS)
• DTC P0499: EVAP CANISTER VENT SHUT VALVE CIRCUIT HIGH VOLTAGE
• DTC P0506: IDLE CONTROL SYSTEM RPM LOWER THAN EXPECTED
• DTC P0562: CHARGING SYSTEM LOW VOLTAGE (2006 MODEL)
• DTC P0563: ECM/PCM POWER SOURCE CIRCUIT UNEXPECTED VOLTAGE
• DTC P0603: ECM/PCM INTERNAL CIRCUIT MALFUNCTION (KEEP ALIVE MEMORY (KAM) ERROR)
• DTC P0630: VIN NOT PROGRAMMED OR MISMATCH
• DTC P0685: ECM/PCM INTERNAL CIRCUIT MALFUNCTION (POWER CONTROL CIRCUIT)
• DTC P0700: A/T CONTROL SYSTEM MALFUNCTION
• DTC P0715: INPUT SHAFT (MAINSHAFT) SPEED SENSOR CIRCUIT MALFUNCTION (M/T) (2004-2005 MODELS)
• DTC P0720: OUTPUT SHAFT (COUNTERSHAFT) SPEED SENSOR CIRCUIT MALFUNCTION (M/T) (2004-2005 MODELS)
• DTC P1077: IMT VALVE STUCK IN HIGH RPM POSITION
• DTC P1078: IMT VALVE STUCK IN LOW RPM POSITION: (2004-2005 MODELS)
• DTC P1109: BARO SENSOR CIRCUIT OUT OF RANGE HIGH (2005-2006 MODELS)
• DTC P1128: MAP SENSOR CIRCUIT LOWER THAN EXPECTED
• DTC P1129: MAP SENSOR CIRCUIT HIGHER THAN EXPECTED
• DTC P1172: REAR A/F SENSOR (BANK 1, SENSOR 1) CIRCUIT OUT OF RANGE HIGH (2005-2006 MODELS); DTC P1174: FRONT A/F SENSOR (BANK 2, SENSOR 1) CIRCUIT OUT OF RANGE HIGH (2005-2006 MODELS)
• DTC P1297: ELD CIRCUIT LOW VOLTAGE (2004-2005 MODELS)
• DTC P1298: ELD CIRCUIT HIGH VOLTAGE (2004-2005 MODELS)
• DTC P1454, P2422: FTP SENSOR CIRCUIT RANGE/PERFORMANCE PROBLEM; DTC P2422: EVAP CANISTER VENT SHUT VALVE STUCK CLOSED MALFUNCTION
• DTC P1549: CHARGING SYSTEM HIGH VOLTAGE (2006 MODEL)
• DTC P1683: THROTTLE VALVE DEFAULT POSITION SPRING PERFORMANCE PROBLEM
• DTC P1684: THROTTLE VALVE RETURN SPRING PERFORMANCE PROBLEM
• DTC P16BB: ALTERNATOR B TERMINAL CIRCUIT LOW VOLTAGE (2006 MODEL)
• DTC P16BC: ALTERNATOR FR TERMINAL CIRCUIT/IGP CIRCUIT LOW VOLTAGE (2006 MODEL)
• DTC P2101: THROTTLE ACTUATOR SYSTEM MALFUNCTION
• DTC P2108: THROTTLE ACTUATOR CONTROL MODULE PROBLEM
• DTC P2118: THROTTLE ACTUATOR CURRENT CIRCUIT RANGE/PERFORMANCE PROBLEM
• DTC P2122: APP SENSOR A (THROTTLE POSITION SENSOR A (THROTTLE POSITION SENSOR D) CIRCUIT LOW VOLTAGE (2004-2005 MODELS)
• DTC P2123: APP SENSOR A (THROTTLE POSITION SENSOR D) CIRCUIT HIGH VOLTAGE (2004-2005 MODELS)
• DTC P2127: APP SENSOR B (THROTTLE POSITION SENSOR E) CIRCUIT LOW VOLTAGE (2004-2005 MODELS)
• DTC P2128: APP SENSOR B (THROTTLE POSITION SENSOR E) CIRCUIT HIGH VOLTAGE (2004-2005 MODELS)
• DTC P2135: TP SENSOR A/B VOLTAGE INCORRECT CORRELATION
• DTC P2138: APP SENSOR A/B (THROTTLE POSITION SENSOR D/E) INCORRECT VOLTAGE CORRELATION
• DTC P2176: THROTTLE ACTUATOR CONTROL SYSTEM IDLE POSITION NOT LEARNED
• DTC P2195: REAR A/F SENSOR (BANK 1, SENSOR 1) SIGNAL STUCK LEAN; DTC P2197: FRONT A/F SENSOR (BANK 2, SENSOR 1) SIGNAL STUCK LEAN
• DTC P2227: BARO SENSOR CIRCUIT RANGE/PERFORMANCE PROBLEM
• DTC P2228: BARO SENSOR CIRCUIT LOW VOLTAGE
• DTC P2229: BARO SENSOR CIRCUIT HIGH VOLTAGE
• DTC P2237: REAR A/F SENSOR (BANK 1, SENSOR 1) IP CIRCUIT HIGH VOLTAGE (2004-2005 MODELS), DTC P2240: FRONT A/F SENSOR (BANK 2, SENSOR 1) IP CIRCUIT HIGH VOLTAGE (2004-2005 MODELS)
• DTC P2237: REAR A/F SENSOR (BANK 1, SENSOR 1) IP CIRCUIT HIGH VOLTAGE (2006 MODEL); DTC P2240: FRONT A/F SENSOR (BANK 2, SENSOR 1) IP CIRCUIT HIGH VOLTAGE (2006 MODEL)
• DTC P2238: REAR A/F SENSOR (BANK 1, SENSOR 1) IP CIRCUIT LOW VOLTAGE (2004-2005 MODELS); DTC P2241: FRONT A/F SENSOR (BANK 2, SENSOR 1) IP CIRCUIT LOW VOLTAGE (2004-2005 MODELS)
• DTC P2243: REAR A/F SENSOR (BANK 1, SENSOR 1) VCENT CIRCUIT HIGH VOLTAGE (2004-2005 MODELS); DTC P2247: FRONT A/F SENSOR (BANK 2, SENSOR 1) VCENT CIRCUIT HIGH VOLTAGE (2004-2005 MODELS)
• DTC P2245: REAR A/F SENSOR (BANK 1, SENSOR 1) VCENT CIRCUIT LOW VOLTAGE (2004-2005 MODELS); DTC P2249: FRONT A/F SENSOR (BANK 2, SENSOR 1) VCENT CIRCUIT LOW VOLTAGE (2004-2005 MODELS)
• DTC P2251: REAR A/F SENSOR (BANK 1, SENSOR 1) VS CIRCUIT HIGH VOLTAGE (2004-2005 MODELS); DTC P2254: FRONT A/F SENSOR (BANK 2, SENSOR 1) VS CIRCUIT HIGH VOLTAGE (2004-2005 MODELS)
• DTC P2252: REAR A/F SENSOR (BANK 1, SENSOR 1) VS CIRCUIT LOW VOLTAGE (2004-2005 MODELS); DTC P2255: FRONT A/F SENSOR (BANK 2, SENSOR 1) VS CIRCUIT LOW VOLTAGE (2004-2005 MODELS)
• DTC P2270: REAR SECONDARY HO2S (BANK 1, SENSOR 2) CIRCUIT SIGNAL STUCK LEAN (2005-2006 MODELS); DTC P2271: REAR SECONDARY HO2S (BANK 1, SENSOR 2) CIRCUIT SIGNAL STUCK RICH (2005-2006 MODELS); DTC P2272: FRONT SECONDARY HO2S (BANK 2, SENSOR 2) CIRCUIT SIGNAL STUCK LEAN (2005-2006 MODELS); DTC P2273: FRONT SECONDARY HO2S (BANK 2, SENSOR 2) CIRCUIT SIGNAL STUCK RICH (2005-2006 MODELS)
• DTC P2279: INTAKE AIR SYSTEM LEAK
• DTC P2413: EGR SYSTEM MALFUNCTION (2004-2005 MODELS)
• DTC P2552: THROTTLE ACTUATOR CONTROL MODULE RELAY MALFUNCTION (2004-2005 MODELS)
• DTC P2610: ECM/PCM IGNITION OFF INTERNAL TIMER MALFUNCTION (2006 MODEL)
• DTC P2627: REAR A/F SENSOR (BANK 1, SENSOR 1) LABEL CIRCUIT LOW VOLTAGE (2004-2005 MODELS); DTC P2630: FRONT A/F SENSOR (BANK 2, SENSOR 1) LABEL CIRCUIT LOW VOLTAGE (2004-2005 MODELS)
• DTC P2628: REAR A/F SENSOR (BANK 1, SENSOR 1) LABEL CIRCUIT HIGH VOLTAGE (2004-2005 MODELS); DTC P2631: FRONT A/F SENSOR (BANK 2, SENSOR 1) LABEL CIRCUIT HIGH VOLTAGE (2004-2005 MODELS)
• DTC P2646: ROCKER ARM OIL PRESSURE SWITCH (VTEC OIL PRESSURE SWITCH) CIRCUIT LOW VOLTAGE (2004-2005 MODELS)
• DTC P2A00: REAR A/F SENSOR (BANK 1, SENSOR 1) CIRCUIT RANGE/PERFORMANCE PROBLEM; DTC P2A03: FRONT A/F SENSOR (BANK 2, SENSOR 1) CIRCUIT RANGE/PERFORMANCE PROBLEM
• DTC U0073: F-CAN MALFUNCTION (BUS-OFF) (2004-2005 MODELS); DTC U0155: F-CAN MALFUNCTION (GAUGE CONTROL MODULE-ECM/PCM) (2004-2005 MODELS)
• DTC U0107: LOST COMMUNICATION WITH THROTTLE ACTUATOR CONTROL MODULE (2004-2005 MODELS)
• DTC U0122: F-CAN MALFUNCTION (VSA-ECM/PCM) (2004-2005 MODELS)
• DTC U0122: F-CAN MALFUNCTION (VSA-ECM/PCM) (2006 MODEL)
• BATTERY TEST
• STARTER CIRCUIT TROUBLESHOOTING
• FUEL PRESSURE TEST
• 2004-2005 MODELS
• 2006 MODEL
• TROUBLESHOOTING
• IDLE SPEED INSPECTION
• APP SENSOR SIGNAL INSPECTION
• FUEL TANK REPLACEMENT
• HOW TO SET READINESS CODES
• OBD STATUS