Diagnostic Trouble Code (DTC) Type(s)
| Diagnostic Trouble Code (DTC) | Domestic | Export Unleaded Fuel |
|---|---|---|
| P0068 | A | A |
| P0106 | B | B |
| P0107 | B | B |
| P0108 | B | B |
| P0112 | B | B |
| P0113 | B | B |
| P0117 | B | B |
| P0118 | B | B |
| P0120 | A | A |
| P0122 | B | B |
| P0123 | B | B |
| P0125 | B | B |
| P0128 | B | B |
| P0130 | B | B |
| P0131 | B | B |
| P0132 | B | B |
| P0133 | B | B |
| P0134 | B | B |
| P0135 | B | B |
| P0136 | B | B |
| P0137 | B | B |
| P0138 | B | B |
| P0140 | B | B |
| P0141 | B | B |
| P0171 | B | B |
| P0172 | B | B |
| P0201-P0204 | B | B |
| P0220 | A | A |
| P0222 | A | A |
| P0223 | A | A |
| P0300 | Type B EMISSION Type A CATALYST | B |
| P0301-P0304 | Type B EMISSION Type A CATALYST | B |
| P0315 | A | A |
| P0326 | B | B |
| P0327 | B | B |
| P0336 | B | B |
| P0340 | B | B |
| P0341 | B | B |
| P0420 | A | A |
| P0442 | A | A |
| P0446 | A | A |
| P0452 | A | A |
| P0453 | A | A |
| P0455 | A | A |
| P0461 | C | C |
| P0462 | C | C |
| P0463 | C | C |
| P0480 | B | B |
| P0481 | B | B |
| P0496 | A | A |
| P0502 | B | B |
| P0506 | B | B |
| P0507 | B | B |
| P0530 | C | C |
| P0562 | C | C |
| P0563 | C | C |
| P0567 | C | C |
| P0568 | C | C |
| P0571 | C | C |
| P0601 | A | A |
| P0602 | A | A |
| P0604 | A | A |
| P0606 | A | A |
| P0607 | C | C |
| P0621 | C | C |
| P0641 | A | A |
| P0651 | A | A |
| P0856 | C | C |
| P1133 | B | B |
| P1137 | B | B |
| P1138 | B | B |
| P1171 | C | C |
| P1516 | A | A |
| P1574 | D | D |
| P1599 | D | D |
| P1621 | A | A |
| P1630 | C | C |
| P1631 | C | C |
| P1640 | C | C |
| P1650 | ||
| P1670 | B | B |
| P1680 | A | A |
| P1681 | A | A |
| P1682 | A | A |
Diagnostic Trouble Code (DTC) Type(s)
Scheme 18
| Callout | Component Name |
|---|---|
| 1 | EVAP Canister Purge Solenoid Valve |
| 2 | To EVAP Canister |
| 3 | Throttle Body |
| 4 | To Intake Manifold |
Scheme 19
| Callout | Component Name |
|---|---|
| 1 | Fuel Tank Pressure (FTP) Sensor |
| 2 | Fuel Tank |
| 3 | Evaporative Emission (EVAP) Vent Solenoid Valve |
| 4 | EVAP Canister |
| 5 | EVAP Service Port |
| 6 | EVAP Purge Solenoid Valve |
| 7 | Fill Limit Vent Valve (FLVV) |
| 8 | Grade Vent Valve |
Spark Plug Inspection
- Inspect the terminal post (1) for damage. Inspect for a bent or broken terminal post (1). Test for a loose terminal post (1) by twisting and pulling the post. The terminal post (1) should NOT move.
- Inspect the insulator (2) for flashover or carbon tracking, soot. This is caused by the electrical charge traveling across the insulator (2) between the terminal post (1) and ground. Inspect for the following conditions: Inspect the spark plug boot for damage. Inspect the spark plug recess area of the cylinder head for moisture, such as oil, coolant, or water. A spark plug boot that is saturated causes arcing to ground.
- Inspect the insulator (2) for cracks. All or part of the electrical charge may arc through the crack instead of the electrodes (3, 4).
- Inspect for evidence of improper arcing. Measure the gap between the center electrode (4) and the side electrode (3) terminals. Refer to «Ignition System Specifications»(ref-188786-S18194948442005090200000) . An excessively wide electrode gap can prevent correct spark plug operation. Inspect for the correct spark plug torque. Refer to «Ignition System Specifications»(ref-188786-S18194948442005090200000) . Insufficient torque can prevent correct spark plug operation. An over torqued spark plug, causes the insulator (2) to crack. Inspect for signs of tracking that occurred near the insulator tip instead of the center electrode (4). Inspect for a broken or worn side electrode (3). Inspect for a broken, worn, or loose center electrode (4) by shaking the spark plug. A rattling sound indicates internal damage. A loose center electrode (4) reduces the spark intensity. Inspect for bridged electrodes (3, 4). Deposits on the electrodes (3, 4) reduce or eliminates the gap. Inspect for worn or missing platinum pads on the electrodes (3, 4) If equipped. Inspect for excessive fouling.
- Inspect the spark plug recess area of the cylinder head for debris. Dirty or damaged threads can cause the spark plug not to seat correctly during installation.
Spark Plug Visual Inspection
- Normal operation-Brown to grayish-tan with small amounts of white powdery deposits are normal combustion by-products from fuels with additives.
- Carbon Fouled-Dry, fluffy black carbon, or soot caused by the following conditions: Rich fuel mixtures Leaking fuel injectors Excessive fuel pressure Restricted air filter element Incorrect combustion Reduced ignition system voltage output Weak coils Worn ignition wires Incorrect spark plug gap Excessive idling or slow speeds under light loads can keep spark plug temperatures so low that normal combustion deposits may not burn off.
- Deposit Fouling-Oil, coolant, or additives that include substances such as silicone, very white coating, reduces the spark intensity. Most powdery deposits will not effect spark intensity unless they form into a glazing over the electrode.
Diagnostic Trouble Codes (DTCs)
The ECM is programmed with test routines that test the operation of the various systems the ECM controls. Some tests monitor internal ECM 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 ECM 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 ECM executes the Action Taken When the DTC Sets. Some DTCs alert the driver via the MIL or a message. Other DTCs do not trigger a driver warning, but are stored in memory. The ECM 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.
Large Leak Test
This tests for large leaks and blockages in the EVAP system. The control module will command the EVAP vent valve ON, closed, and command the EVAP purge valve ON, open, with the engine running, allowing engine vacuum into the EVAP system. The control module monitors the fuel tank pressure (FTP) sensor 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 valve OFF, closed, 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 is more than a calibrated level on 2 consecutive tests, a DTC P0440 will set.
Small Leak Test
If the large leak test passes, the control module will test for small leaks by continuing to monitor the FTP sensor for a change in voltage over a period of time. If the decay rate is more than a calibrated value, the control module will rerun the test. If the test fails again, a DTC P0442 will set.
Canister Vent Restriction Test
If the 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 valve ON, open, and commanding the EVAP vent valve OFF, open, and monitoring the FTP sensor for an increase in vacuum. If vacuum increases more than a calibrated value, DTC P0446 will set.
Purge Valve Leak Test
If the EVAP purge 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 valve OFF, closed, and vent valve OFF, open, sealing the system, and monitoring the FTP for an increase in vacuum. If the control module detects that EVAP system vacuum increases above a calibrated value, DTC P1441 will set.