Engine Controls - (5VZ-FE) - Diagnostics: Pre-Check

DIAGNOSIS SYSTEM
1. Description
  - When troubleshooting On-Board Diagnostic (OBD II) vehicles, the vehicle must be connected to the OBD II scan tool (in compliance with SAE J1978) or the hand-held tester. Various data output from the vehicle's ECM can then be read.
  - OBD II regulations require that the vehicle's onboard computer illuminates the Malfunction Indicator Light (MIL) on the instrument panel when the computer detects a malfunction in: 1) the emission control system/components, or 2) the powertrain control components (which affect vehicle emissions), or 3) the computer. In addition, the applicable Diagnostic Trouble Codes (DTCs) prescribed by SAE J2012 are recorded in the ECM memory (see DIAGNOSTIC TROUBLE CODE CHART ).
    If the malfunction does not reoccur in 3 consecutive trips, the MIL goes off automatically but the DTCs remain recorded in the ECM memory.
    
    Fig 1: Locating Malfunction Indication Light
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  - To check DTCs, connect the hand-held tester or OBD II scan tool to the Data Link Connector 3 (DLC3) of the vehicle. The hand-held tester or OBD II scan tool also enables you to erase the DTC and check the freeze frame data and various forms of engine data (see the instruction manual for the OBD II scan tool or the hand-held tester). The DTC includes SAE controlled codes and manufacturer controlled codes. SAE controlled codes must be set according to the SAE, while manufacturer controlled codes can be set by a manufacturer with certain restrictions (See DTC chart DIAGNOSTIC TROUBLE CODE CHART ).
  - The diagnosis system operates in normal mode during normal vehicle use. In "normal mode", 2 trip detection logic* is used to ensure accurate detection of malfunctions. A "check mode", is also available to technicians as an option. In "check mode", 1 trip detection logic is used for simulating malfunction symptoms and increasing the system's ability to detect malfunctions, including intermittent malfunctions (hand-held tester only) (See step 3).
    
    Fig 2: Connecting Hand Held Tester To DLC3
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  - *2 trip detection logic:
    When a malfunction is first detected, the malfunction is temporarily stored in the ECM memory (1st trip). If the ignition switch is turned OFF and then ON again, and the same malfunction is detected again, the MIL will illuminate (2nd trip).
  - Freeze frame data:
    The freeze frame data records the engine conditions (fuel system, calculated load, engine coolant temperature, fuel trim, engine speed, vehicle speed, etc.) when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
  Priorities for troubleshooting:
  
  When multiple DTCs occur, find out the order in which the DTCs should be inspected by checking the component's DTC chart. If no instructions are written in the DTC chart, check DTCs in the following order of priority:
  1. DTCs other than fuel trim malfunction DTCs (P0171 and P0172) and misfire DTCs (P0300 - P0306).
  2. Fuel trim malfunction DTCs (P0171 and P0172).
  3. Misfire DTCs (P0300 - P0306).
2. Check the DLC3.
  The vehicle's ECM uses the ISO 9141-2 communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 9141-2 format.
  
  Fig 3: Identifying DLC3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 4: Connection Testing Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  HINT:
  
  Connect the cable of the OBD II scan tool or the hand-held tester to the DLC3, turn the ignition switch to ON and attempt to use the hand-held tester. If the screen displays UNABLE TO CONNECT TO VEHICLE, a problem exists in the vehicle side or the tester side.
  - If the communication is normal when the tool is connected to another vehicle, inspect the DLC3 of the original vehicle.
  - If the communication is still not possible when the tool is connected to another vehicle, the problem is probably in the tool itself, so consult the Service Department listed in the tool's instruction manual.
3. Inspect battery voltage.
  Battery Voltage: 11 to 14V
  
  If voltage is below 11 V, recharge the battery before proceeding.
4. Check MIL.
  1. The MIL turns on when the ignition switch is turned ON and the engine is not running.
    HINT:
    
    If the MIL does not light up, troubleshoot the combination meter (See COMBINATION METER ).
  2. When the engine is started, the MIL should turn off. If the lamp remains on, the diagnosis system has detected a malfunction or abnormality in the system.
  3. See DIAGNOSTIC TROUBLE CODE CHART to confirm the details of the DTCs.
Fig 5: Locating Malfunction Indication Light
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
DTC CHECK / CLEAR (Normal Mode)
NOTE:
- If no DTC appears in the normal mode: On the OBD II scan tool or the hand-held tester, check the pending fault code using the Continuous Test Results function (Mode 7 for SAE J1979).
- When the diagnosis system is changed from normal mode to check mode or vice-versa, all DTCs and freeze frame data recorded in normal mode will be erased. Before changing modes, always check and make a note of DTCs and freeze frame data.
1. Check the DTC.
  1. Connect the OBD II scan tool or hand-held tester to the DLC3.
  2. Turn the ignition switch to ON.
  3. Use the OBD II scan tool or the hand-held tester to check the DTCs and freeze frame data and then write them down. For the hand-held tester, select the item: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES. For the OBD II scan tool, see its instruction manual.
  4. See DIAGNOSTIC TROUBLE CODE CHART to confirm the details of the DTCs.
  NOTE:
  When simulating a symptom with the OBD II scan tool (excluding hand- held tester) to check DTCs, use normal mode. For DTCs subject to "2 trip detection logic", perform either of the following actions.
  - Check the pending fault code: For the hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / PENDING CODES.
  - Turn the ignition switch to OFF after the symptom is simulated once. Then repeat the simulation process again. When the problem has been simulated again, the MIL illuminates and the DTCs are recorded in the ECM.
  - Check the pending fault code using the Continuous Test Results function (Mode 7 for SAE J1979) on the OBD II scan tool.
2. Clear the DTC (using OBD II scan tool or hand-held tester).
  1. Connect the OBD II scan tool or the hand-held tester to the DLC3.
  2. Turn the ignition switch to ON.
  3. Erase DTCs and freeze frame data with the OBD II scan tool (complying with SAE J1978) or the hand-held tester. For the hand-held tester: 1) enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CLEAR CODES; and 2) press YES. For the OBD II scan tool, see its instruction manual.
3. Clear DTC (not using OBD II scan tool or hand-held tester)
  1. Disconnecting the battery cable, or remove the EFI NO. 1 fuse AND ETCS fuse more than 60 seconds. After disconnecting the battery terminal, perform the "INITIALIZE" procedure (See PRE-CHECK ).
CHECK MODE PROCEDURE
HINT:

Hand-held tester only:

Check mode has a higher sensitivity to detect malfunctions and can detect malfunction that normal mode cannot detect. Check mode can also detect all the malfunctions that normal mode can detect.

Check mode procedure.
1. Make sure that the items below are true:
  - Battery positive voltage 11 V or more
  - Throttle valve fully closed
  - Transmission in the P or N position
  - A/C switched OFF
2. Turn the ignition switch to OFF.
3. Connect the hand-held tester to the DLC3 in the at the lower left of the instrument panel.
4. Turn the ignition switch to ON and push the hand-held tester ON.
5. Change the ECM to check mode with the hand-held tester. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / CHECK MODE. Make sure the MIL flashes as shown in the figure.
  NOTE: All DTCs and freeze frame data recorded will be erased if: 1) the hand-held tester is used to change the ECM from normal mode to check mode or vice-versa; or 2) during check mode, the ignition switch is turned from ON to ACC or OFF.
  
  Fig 6: Inspecting Flashing
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
6. Start the engine. The MIL should turn off after the engine starts.
7. Simulate the conditions of the malfunction described by the customer.
8. After simulating the malfunction conditions, use the hand-held tester diagnosis selector to check the DTC, freeze frame data and other data.
9. After checking the DTC, inspect the applicable circuit.
1. Using OBD II scan tool or hand-held tester:
  Clear DTC
  1. Connect the OBD II scan tool or hand-held tester to the DLC3.
  2. Turn the ignition switch to ON.
  3. Erase DTCs and freeze frame data with the OBD II scan tool (complying with SAE J1978) or the hand-held tester. For the hand-held tester: 1) enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CLEAR CODES; and 2) press YES. For the OBD II scan tool, see its instruction manual.
Clear DTC (not using OBD II scan tool or hand-held tester)
1. Disconnecting the battery cable, or remove the EFI NO. 1 fuse more than 60 seconds.
  After disconnecting the battery terminal, perform the "INITIALIZE" procedure (See PRE-CHECK ).
FAIL-SAFE CHART
If any of the following codes are recorded, the ECM enters into the ail-safe mode.

Fig 7: DTC Fail Safe Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CHECK FOR INTERMITTENT PROBLEMS
HINT:

Hand-held tester only:

By putting the vehicle's ECM in check mode, 1 trip detection logic is possible instead of 2 trip detection logic and sensitivity to detect open circuits is increased. This makes it easier to detect intermittent problems.
1. Clear the DTCs (See step 2).
2. Set the check mode (See step 3).
3. Perform a simulation test (See HOW TO PROCEED WITH TROUBLESHOOTING ).
4. Check the connector and terminal (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
5. Handle the connector (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
BASIC INSPECTION
When the malfunction code is not confirmed in the DTC check, troubleshooting should be performed in all the possible circuits considered as the cause of the problems. In many cases, by carrying out the basic engine check shown in the following flow chart, the location causing the problem can be found quickly and efficiently. Therefore, use this check is essential in the engine troubleshooting.
1. Is battery positive voltage 11 V or more when engine is stopped?
  1. NO: Charge or replace battery.
  2. YES: Go to next step.
2. Is engine cranked?
  1. NO: Proceed to STARTERS , and continue to troubleshoot.
  2. YES: Go to next step.
3. Does engine start?
  1. NO: Go to step 7 .
  2. YES: Go to next step.
4. Check air filter.
  PREPARATION:
  
  Remove the air filter.
  
  CHECK:
  
  Visually check that the air filter is not dirty or excessive oily.
  1. NG: Replace air filter.
  2. OK: Go to next step.
5. Check idle speed.
  PREPARATION:
  1. Warm up the engine to the normal operating temperature.
  2. Switch off all the accessories.
  3. Switch off the A/C.
  4. Shift the transmission into the N position.
  5. Connect the hand-held tester or OBD II scan tool to the DLC3 of the vehicle.
  CHECK:
  
  Use the "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL" to check the idle speed.
  
  OK:
  1. Idle speed: 650 to 750 RPM
  1. NG: Proceed to PROBLEM SYMPTOMS TABLE .
  2. OK: Go to next step.
6. Check ignition timing (See IGNITION TIMING (5VZ-FE) ).
  1. NG: Proceed to IGNITION SYSTEM (5VZ-FE) , and continue to troubleshoot.
  2. OK: Proceed to PROBLEM SYMPTOMS TABLE .
7. Check fuel pressure.
  PREPARATION:
  1. Be sure that enough fuel is in the tank.
  2. Connect the hand-held tester to the DLC3.
  3. Turn the ignition switch ON and push the hand-held tester main switch ON.
  4. Use the ACTIVE TEST mode to operate the fuel pump.
  5. Please refer to the hand-held tester operator's manual for further details.
  6. Without hand-held tester, connect the positive (+) and negative (-) leads from the battery to the fuel pump connector (See FUEL PUMP ).
  Fig 8: Locating Fuel Inlet Hose
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  CHECK:
  
  Check for the fuel pressure in the fuel inlet hose when it is pinched by hand.
  
  HINT:
  
  At this time, you will hear the fuel flowing noise.
  1. NG: Proceed to FUEL PUMP , and continue to troubleshoot.
  2. OK: Go to next step.
8. Check for spark.
  PREPARATION:
  1. Remove the ignition coil or disconnect the high-tension cord from the spark plug.
  2. Remove the spark plug.
  3. Connect the ignition coil or high-tension cord to the spark plug again, and connect the ignition coil connector.
  4. Disconnect the injector connector.
  5. Ground the spark plug.
  Fig 9: Connecting Ignition Coil To Spark Plug
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  CHECK:
  
  Check if spark occurs while the engine is being cranked.
  
  NOTE: To prevent excess fuel from being injected from the injectors during this test, don't crank the engine for more than 5-10 seconds at a time.
  1. NG: Proceed to IGNITION SYSTEM (5VZ-FE) , and continue to troubleshoot.
  2. OK: Proceed to PROBLEM SYMPTOMS TABLE .
DATA LIST
HINT:

According to the DATA LIST displayed by the OBD II scan tool or hand-held tester, you can read the value of the switch, sensor, actuator and so on without parts removal. Reading the DATA LIST as a first step of troubleshooting is one of the method to shorten the labor time.

NOTE: The values given below for "Normal Condition" are representative values. So, a vehicle may still be normal even if its value differs from those listed here. So, do not depend solely on the "Normal Condition" here when deciding whether a part is faulty or not.
1. Warm up the engine.
2. Turn the ignition switch OFF.
3. Connect the OBD II scan tool or the Hand-held tester to the DLC3.
4. Turn the ignition switch to ON.
5. Turn ON the hand-held tester.
6. Select the item: DIAGNOSIS / ENHANCED OBD II / DATA LIST.
7. According to the display on tester, read the DATA LIST.
Fig 10: Data List Measurement Chart (1 Of 3)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 11: Data List Measurement Chart (2 Of 3)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 12: Data List Measurement Chart (3 Of 3)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
ACTIVE TEST
HINT:

Performing the ACTIVE TEST using the OBD II scan tool or Hand-held tester allows the relay, VSV, actuator and so on to operate without parts removal. Performing the ACTIVE TEST as a first step of troubleshooting is one of the method to shorten the labor time.

It is possible to display the DATA LIST during the ACTIVE TEST.
1. Warm up the engine.
2. Turn the ignition switch OFF.
3. Connect the OBD II scan tool or the Hand-held tester to the DLC3.
4. Turn the ignition switch ON.
5. According to the display on tester, read the "ACTIVE TEST".
Fig 13: Active Test Diagnostic Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

DEFINITION OF TERMS

TERMS DEFINITION CHART

Term	Definition
Monitor description	Description of what the ECM monitors and how it detects malfunctions (monitoring purpose and its details).
Related DTCs	Diagnostic code
Typical enabling condition	Preconditions that allow the ECM to detect malfunctions. With all preconditions satisfied, the ECM sets the DTC when the monitored value(s) exceeds the malfunction threshold(s).
Sequence of operation	The priority order that is applied to monitoring, if multiple sensors and components are used to detect the malfunction. While another sensor is being monitored, the next sensor or component will not be monitored until the previous monitoring has concluded.
Required sensor/components	The sensors and components that are used by the ECM to detect malfunctions.
Frequency of operation	The number of times that the ECM checks for malfunctions per driving cycle. "Once per driving cycle" means that the ECM detects malfunction only one time during a single driving cycle. "Continuous" means that the ECM detects malfunction every time when enabling condition is met.
Duration	The minimum time that the ECM must sense a continuous deviation in the monitored value(s) before setting a DTC. This timing begins after the "typical enabling conditions" are met.
Malfunction thresholds	Beyond this value, the ECM will conclude that there is a malfunction and set a DTC.
MIL operation	MIL illumination timing after a defect is detected. "Immediately" means that the ECM illuminates MIL the instant the ECM determines that there is a malfunction. "2 driving cycle" means that the ECM illuminates MIL if the same malfunction is detected again in the 2nd driving cycle.

TOYOTA/LEXUS PART AND SYSTEM NAME LIST

This reference list indicates the part names used along with their definitions.

PART AND SYSTEM NAME LIST

TOYOTA/LEXUS name	Definition
Toyota HCAC system, Hydro-Carbon Adsorptive Catalyst (HCAC) system, HC adsorptive three-way catalyst	HC adsorptive three-way catalytic converter
Variable Valve Timing sensor, VVT sensor	Camshaft position sensor
Variable valve timing system, VVT system	Camshaft timing control system
Camshaft timing oil control valve, Oil control valve, OCV, VVT, VSV	Camshaft timing oil control valve
Variable timing and lift, VVTL	Camshaft timing and lift control
Crankshaft position sensor "A"	Crankshaft position sensor
Engine speed sensor	Crankshaft position sensor
THA	Intake air temperature
Knock control module	Engine knock control module
Knock sensor	Engine knock sensor
Mass or volume air flow circuit	Mass air flow sensor circuit
Vacuum sensor	Manifold air pressure sensor
Internal control module, Control module, Engine control ECU, PCM	Power train control module
FC idle	Deceleration fuel cut
Idle air control valve	Idle speed control
CCV, Canister close valve VSV for canister control	Evaporative emissions canister vent valve
EVAP VSV, Vacuum switching valve assembly No. 1, EVAP VSV, Purge VSV	Evaporative emissions canister purge valve
VSV for pressure switching valve, Bypass VSV	Evaporative emission pressure switching valve
Vapor pressure sensor, EVAP pressure sensor, Evaporative emission control system pressure sensor	Fuel tank pressure sensor
Charcoal canister	Evaporative emissions canister
ORVR system	On-board refueling vapor recovery system
Intake manifold runner control	Intake manifold tuning system
Intake manifold runner valve, IMRV, IACV (runner valve)	Intake manifold tuning valve
Intake control VSV	Intake manifold tuning solenoid valve
AFS	Air fuel ratio sensor
O2 sensor	Heater oxygen sensor
Oxygen sensor pumping current circuit	Oxygen sensor output signal
Oxygen sensor reference ground circuit	Oxygen sensor signal ground
Accel position sensor	Accelerator pedal position sensor
Throttle actuator control motor, Actuator control motor, Electronic throttle motor, Throttle control motor	Electronic throttle actuator
Electronic throttle control system, Throttle actuator control system	Electronic throttle control system
Throttle/pedal position sensor, Throttle/pedal position switch, Throttle position sensor/switch	Throttle position sensor
Turbo press sensor	Turbocharger pressure sensor
Turbo VSV	Turbocharger pressure control solenoid valve
P/S pressure switch	Power-steering pressure switch
VSV for ACM	Active control engine mount

List of Disable a Monitor
HINT:

This table below shows the ECM monitoring status for the components listed in the top of the table when the DTCs on the left of the table are set.

As for the "X" mark, when the DTC on the left is stored, detection of the DTC in the upper column is not performed.

Fig 14: Monitor Disable List Chart (1 Of 6)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 15: Monitor Disable List Chart (2 Of 6)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 16: Monitor Disable List Chart (3 Of 6)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 17: Monitor Disable List Chart (4 Of 6)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 18: Monitor Disable List Chart (5 Of 6)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 19: Monitor Disable List Chart (6 Of 6)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

O2S TEST RESULT

INTRODUCTION
The O2S TEST RESULT refers to the results of the engine control module (ECM) when it monitors the oxygen sensor (O2S), and it can be read using the hand-held tester or the generic OBDII scan tool. Based on this, you can find the O2S's conditions.

The ECM monitors the O2S in the various items. You can read the monitor result (TEST DATA) of each monitor item using the O2S TEST RESULT. However, the output value of the TEST DATA is the latest "snapshot" value that is it taken after monitoring and therefore it is not dynamic. In this article, the description of the O2S TEST RESULT (for O2S related DTCs) are written in a table. This table consists of 5 items:
1. TEST ID (a code applied to each TEST DATA)
2. Description of TEST DATA
3. Conversion Factor (When Conversion Factor has a value written in the table, multiply the TEST DATA value appearing on the scan tool by the Conversion Factor value. The result will be the required value.)
4. Unit
5. Standard Value
If the TEST DATA value appearing on the scan tool is out of the standard value, the O2S is malfunctioning. If it is within the standard value, the O2S is functioning normally. However, if the value is on the borderline of the standard value, the O2S may malfunction very soon.
HOW TO READ O2S TEST RESULT USING HAND-HELD TESTER
1. Connect the hand-held tester to the DLC3.
2. On the tester screen, select the following menus: DIAGNOSIS/CARB OBDII/O2S TEST RESULT. A list of the O2S equipped on the vehicle will be displayed.
  
  Fig 20: Sensor Numbering List
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Select the desired O2S and press ENTER. The following screen will appear.
4. Press HELP and iquest simultaneously. More information will appear.
5. Example:
  - The hand-held tester displays "17" as a value of the "TIME $81" (see Fig 21).
  - Find the Conversion Factor value of "TIME $81" in the O2S TEST RESULT chart below. 0.3906 is specified for $81 in this chart.
  - Multiply "17" in step (1) by 0.3906 (Conversion Factor) in the step (2).
    17 x 0.3906 = 6.6%
  - If the answer is within the standard value, the "TIME $81" can be confirmed to be normal.

Fig 21: Identifying Hand-Held Tester Display

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

O2S TEST RESULT Chart

O2S TEST RESULT DESCRIPTION

TEST ID	Description of TEST DATA	Conversion Factor	Unit	Standard Value
$81	Percentage of monitoring time when the O2S voltage is less than 0.05V	Multiply 0.3906	%	Within 60 %

CHECKING MONITOR STATUS
NOTE: The Monitor Status is not applicable to the heated oxygen sensor (HO2S). The HO2S status can be checked with O2S TEST RESULT.
1. INTRODUCTION
  The purpose of the monitor result (mode 6) is to allow access to the results for on-board diagnostic monitoring tests of specific components/systems that are not continuously monitored. Examples are catalyst, EVAP and thermostat.
  
  The monitor result allows the OBD scan tool to display the monitor status, test value and test limit. The monitor status indicates whether the component is functioning normally or not (PASS or FAIL). The test value is the value that was used to determine the monitor status. When the test value is inside the test limit, the ECM determines the component is functioning normally (PASS). If the test value is outside the test limit, the ECM determines the component is malfunctioning (FAIL).
  
  A problem in these components/systems can be found by comparing the test value and test limit. The monitor result information is included under "MONITOR RESULT" in the DTC tests.
2. PROCEDURE
  NOTE: The monitor result and test value are cleared when the ignition switch is turned OFF.
  1. Connect the hand-held tester to the DLC3.
  2. Turn the ignition switch ON.
  3. Clear the DTCs.
  4. Run the vehicle in accordance with the applicable drive pattern described in READINESS MONITOR DRIVE PATTERN (see READINESS MONITOR DRIVE PATTERN ).
  5. Select from the tester menus: DIAGNOSIS, ENHANCED OBD II, MONITOR INFO and MONITOR RESULT. The monitor result appears after the component name.
    INCMP: The component has not been monitored yet.
    
    PASS: The component is functioning normally.
    
    FAIL: The component is malfunctioning.
  6. Confirm that the component is set to either PASS or FAIL.
    
    Fig 22: Checking Monitor Status Result Block
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. Select the component (Label) and press ENTER. The accuracy test value appears when the monitor result is either PASS or FAIL.
    VAL The test value
    
    LMT: The test limit
    
    TLT: The test limit type. Either 0 or 1 is displayed.
  8. If TLT is 0, the component is malfunctioning when the test value is higher than the test limit. If TLT is 1, the component is malfunctioning when the test value is lower than the test limit.
  9. Compare the test value with the test limit. The test value is usually significantly higher or lower than the test limit. If the test value is on the borderline of the test limit, there is a potential malfunction in the component.

HINT:

The monitor result might on rare occasions be PASS even if the MIL is illuminated. This indicates the system malfunctioned on a previous driving cycle. This might be caused by an intermittent problem.

Fig 23: Thermostat Malfunction Display System