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Engine Controls (1ZZ-FE) - Diagnostics: Other Toyota Celica T230 рестайлинг

Testing & Diagnostics 26 illustrations ~3502 words

TYPICAL MALFUNCTION THRESHOLDS

Detection CriteriaThreshold
Either of the following conditions is metA or B
A. Output signal duty for OCVOutput duty ratio is 100% (always ON) but target duty ratio is less than 70%
B. Output signal duty for OCVOutput duty is 3% or less despite the ECM supplying current to the OCV

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

ParameterStandard Value
Output signal duty for OCV"More than 3%" and "less than 100%"

COMPONENT OPERATING RANGE

Scheme 278

Scheme 278: WIRING DIAGRAM
Scheme 278: WIRING DIAGRAM
Detection CriteriaThreshold
Duration time of the following condition; A and B are met5 sec. or more
A. Following conditions are met(a) and (b)
(a) VVT control statusFeedback
(b) Deviation of valve timing (Target valve timing - Actual valve timing)More than 5°CA
B. Response of valve timing5 sec./5°CA or more

TYPICAL MALFUNCTION THRESHOLDS - CAMSHAFT POSITION "A" -TIMING OVER

Detection CriteriaThreshold
Either of the following conditions is met for 18 sec.A or B
A "VVT learned" valueLess than 24°CA
B "VVT learned" valueMore than 46°CA

TYPICAL MALFUNCTION THRESHOLDS - CRANKSHAFT POSITION - CAMSHAFT POSITION CORRELATION (BANK 1 SENSOR A)

MONITOR RESULT

The detailed information is described in "CHECKING MONITOR STATUS" (see PRE-CHECK ).

  1. TID (Test Identification) is assigned to each emission-related component.
  2. TLT (Test Limit Type): 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.
  3. CID (Component Identification) is assigned to each test value.
  4. Unit Conversion is used to calculate the test value indicated on generic OBD scan tools.

TID $04: HO2S Heater

TLTCIDUnit ConversionDescription of Test ValueDescription of Test Limit
1$01Multiply by 0.000076 (A)Maximum HO2S heater current (bank 1 sensor 1)Malfunction criterion
1$02Multiply by 0.000076 (A)Maximum HO2S heater current (bank 1 sensor 2)Malfunction criterion

MONITOR RESULT - OXYGEN SENSOR HEATER CONTROL CIRCUIT

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not presentSee "List of disable a monitor" (in PRE-CHECK )
The typical enabling condition is not available

TYPICAL ENABLING CONDITIONS - MASS OR VOLUME AIR FLOW CIRCUIT

Detection CriteriaThreshold
Mass air flow meter voltageLess than 0.2 V or more than 4.9 V

TYPICAL MALFUNCTION THRESHOLDS - MASS OR VOLUME AIR FLOW CIRCUIT

ParameterStandard Value
Mass air flow meter voltage0.4 to 2.2V

COMPONENT OPERATING RANGE - MASS OR VOLUME AIR FLOW CIRCUIT

Scheme 279

Scheme 279: WIRING DIAGRAM
Scheme 279: WIRING DIAGRAM
Detection CriteriaThreshold
Mass air flow meter voltage (High voltage)More than 2.2 V
Mass air flow meter voltage (Low voltage)Less than 0.4 V

TYPICAL MALFUNCTION THRESHOLDS - MASS AIR FLOW CIRCUIT RANGE/PERFORMANCE PROBLEM

The monitor will run whenever the following DTCs are not presentSee "List of disable a monitor" (in PRE-CHECK )
The typical enabling condition is not available

TYPICAL ENABLING CONDITIONS - INTAKE AIR TEMP. CIRCUIT MALFUNCTION

Detection CriteriaThreshold
Intake air temperature sensor resistance (Intake air temperature)Less than 98.5 ohm, or more than 156 (More than 140°C (284°F), or less than -40°C (-40°F))

TYPICAL MALFUNCTION THRESHOLDS - INTAKE AIR TEMP. CIRCUIT MALFUNCTION

ParameterStandard Value
Intake air temperature sensor resistance98.5 ohm (140°C (284°F)) to 156 kohm (-40 °C (-40ohmF))

COMPONENT OPERATING RANGE - INTAKE AIR TEMP. CIRCUIT MALFUNCTION

Scheme 280

Scheme 280: WIRING DIAGRAM
Scheme 280: WIRING DIAGRAM
The monitor will run whenever the following DTCs are not presentSee "List of disable a monitor" (in PRE-CHECK )
The typical enabling condition is not available

TYPICAL ENABLING CONDITIONS - ENGINE COOLANT TEMPERATURE CIRCUIT

Detection CriteriaThreshold
Engine coolant temperature sensor resistance (Coolant temperature)Less than 79 ohm or more than 156 kohm (More than 140°C (284°F) or less than -40°C (-40°F))

TYPICAL MALFUNCTION THRESHOLDS - ENGINE COOLANT TEMPERATURE CIRCUIT

ParameterStandard Value
Engine coolant temperature sensor resistance79 ohm (140°C (284°F)) to 156 kohm (-40°C (-40°F))

COMPONENT OPERATING RANGE - ENGINE COOLANT TEMPERATURE CIRCUIT

Scheme 281

Scheme 281: WIRING DIAGRAM
Scheme 281: WIRING DIAGRAM
Standard Value
Engine coolant temperature changes with the actual engine coolant temperature

COMPONENT OPERATING RANGE - ENGINE COOLANT TEMPERATURE CIRCUIT RANGE/PERFORMANCE PROBLEM

The monitor will run whenever the following DTCs are not presentSee "List of disable a monitor" (in PRE-CHECK )
The typical enabling condition is not available

TYPICAL ENABLING CONDITIONS - THROTTLE POSITION SENSOR/SWITCH "A" CIRCUIT MALFUNCTION

Detection criteriaThreshold
Throttle position sensor voltageLess than 0.1 V or more than 4.9 V

TYPICAL MALFUNCTION THRESHOLDS - THROTTLE POSITION SENSOR/SWITCH "A" CIRCUIT MALFUNCTION

ParameterStandard value
Throttle position sensor voltage0.1 to 4.9 V

COMPONENT OPERATING RANGE - THROTTLE POSITION SENSOR/SWITCH "A" CIRCUIT MALFUNCTION

Scheme 282

Scheme 282: WIRING DIAGRAM
Scheme 282: WIRING DIAGRAM
Detection CriteriaThreshold
Closed throttle position learning value26.254° (1.05 V) or more or less than 7.456° (0.298 V)

TYPICAL MALFUNCTION THRESHOLDS - THROTTLE/PEDAL POSITION SENSOR/SWITCH "A" CIRCUIT RANGE/PERFORMANCE PROBLEM

ParameterStandard Value
Closed throttle position learning valueLess than 26.254° (1.05 V) and 7.456° (0.298 V) or more

COMPONENT OPERATING RANGE - THROTTLE/PEDAL POSITION SENSOR/SWITCH "A" CIRCUIT RANGE/PERFORMANCE PROBLEM

Detection CriteriaThreshold
A. Estimated engine coolant temperature75°C (167°F) or more
B. Engine coolant temperature sensor output valueLess than 75°C (167°F)
Duration period of both A and B5 sec. or more

TYPICAL MALFUNCTION THRESHOLDS - COOLANT THERMOSTAT (COOLANT TEMPERATURE BELOW THERMOSTAT REGULATING TEMPERATURE)

The detailed information is described in "CHECKING MONITOR STATUS" (see PRE-CHECK ).

  1. TID (Test Identification) is assigned to each emission-related component.
  2. TLT (Test Limit Type): 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.
  3. CID (Component Identification) is assigned to each test value.
  4. Unit Conversion is used to calculate the test value indicated on generic OBD scan tools.

TID $08: Thermostat

TLTCIDUnit ConversionDescription of Test ValueDescription of Test Limit
1$01Multiply by 0.625 and subtract 40 (°C)ECT sensor output when estimated ECT reaches malfunction criterionMalfunction criterion

MONITOR RESULT - COOLANT THERMOSTAT (COOLANT TEMPERATURE BELOW THERMOSTAT REGULATING TEMPERATURE)

Detection CriteriaThreshold
Either the following conditions A or B is met3 times or more
A. Front oxygen sensor voltage is 0.55 V or lessFor 18 sec. or more
B. Front oxygen sensor voltage is 0.4 V or moreFor 18 sec. or more

TYPICAL MALFUNCTION THRESHOLDS - OXYGEN SENSOR CIRCUIT (BANK 1 SENSOR 1)

ParameterStandard value
In the normal condition, the heated oxygen sensor voltage0 to 1 V

COMPONENT OPERATING RANGE - OXYGEN SENSOR CIRCUIT (BANK 1 SENSOR 1)

Detection CriteriaThreshold
Time that output voltage of front heated oxygen sensor increase from 0.4 V to 0.55 V and that they decrease from 0.55 V to 0.4 V1.0 sec. or more

TYPICAL MALFUNCTION THRESHOLDS

ParameterStandard value
Voltage output from heated oxygen sensorQuickly fluctuates between 0.4 V and 0.55 V

COMPONENT OPERATING RANGE

Detection CriteriaThreshold
Front heated oxygen sensor voltageLess than 0.45 V

TYPICAL MALFUNCTION THRESHOLDS

ParameterStandard value
In the normal condition, the front heated oxygen sensor voltage0 to 1 V

COMPONENT OPERATING RANGE

ParameterStandard Value
Heated oxygen sensor voltage0 to 1 V

COMPONENT OPERATING RANGE

Detection CriteriaThreshold
Either following condition continues for 3 sec.A or B
A. Smoothed fuel trim learning value (Lean)1.35 or more
B. Smoothed fuel trim learning value (Rich)0.65 or less

TYPICAL MALFUNCTION THRESHOLDS

CONFIRMATION DRIVING PATTERN

  1. Connect the hand-held tester to the DLC3.
  2. Record DTCs and the freeze frame data.
  3. Set the check mode using the hand-held tester (See «PRE-CHECK»(ref-206111-S34504961872005112400000) ).
  4. Read the value on the misfire counter for each cylinder when idling. If the value is displayed on the misfire counter, skip the following procedure of confirmation driving.
  5. Drive the vehicle several times with the engine speed, load and its surrounding range shown with ENGINE SPD, CALC LOAD in the freeze frame data or MISFIRE RPM, MISFIRE LOAD in the data list. If you have no hand-held tester, turn the ignition switch OFF after the symptom is simulated once. Then repeat the simulation process again. HINT: Do not turn the ignition switch OFF during the confirmation driving pattern. This switches the diagnosis system from the check mode to the normal mode, so all the DTCs and freeze frame data will be erased. ENGINE SPEED Engine Speed Time Idling 5 minutes and 45 seconds or more 1,000 RPM 4 minutes or more 2,000 RPM 3 minutes and 30 seconds or more 3,000 RPM 1 minute and 30 seconds or more
  6. Check whether there is misfire, and DTC and the freeze frame data. After that, record them.
  7. Turn the ignition switch OFF and wait for at least 5 seconds.
Detection CriteriaThreshold
Sensor failure is indicated when the knock sensor output level is below the specific threshold for10 sec.

TYPICAL MALFUNCTION THRESHOLDS

Scheme 283

Scheme 283: WIRING DIAGRAM
Scheme 283: WIRING DIAGRAM
Detection CriteriaThreshold
Case 1
Engine speed signalNo signal for 4.7 sec.
Case 2
Engine speed signalNo signal for 0.5 sec.

TYPICAL MALFUNCTION THRESHOLDS

Scheme 284

Scheme 284: WIRING DIAGRAM
Scheme 284: WIRING DIAGRAM
ParameterStandard Value
Camshaft position sensor signal input during every 720°CA3

COMPONENT OPERATING RANGE

Detection CriteriaThreshold
"Ignition signal fail count"More than 2
"Ignition signal fail count" is as followsWhen IGF should have returned despite sending IGT

TYPICAL MALFUNCTION THRESHOLDS

Standard Value
Confirmed signal number = ignition signal number

COMPONENT OPERATING RANGE

Scheme 285

Scheme 285: WIRING DIAGRAM
Scheme 285: WIRING DIAGRAM
Detection CriteriaThreshold
Catalyst deterioration level (Heated oxygen sensor locus length ratio)0.52 or more
Number of times detection4 times

TYPICAL MALFUNCTION THRESHOLDS

The detailed information is described in "CHECKING MONITOR STATUS" (see PRE-CHECK ).

  1. TID (Test Identification) is assigned to each emission-related component.
  2. TLT (Test Limit Type): 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.
  3. CID (Component Identification) is assigned to each test value.
  4. Unit Conversion is used to calculate the test value indicated on generic OBD scan tools.

TID $01: Catalyst- Using Front HO2S and Rear HO2S

TLTCIDUnit ConversionDescription of Test ValueDescription of Test Limit
0$01Multiply by 0.0078 (no dimension)Catalyst deterioration level bank 1 : Determined by waveform of front HO2S and rear HO2SMalfunction criterion

DESCRIPTION OF TEST VALUE

Scheme 286

Scheme 286: CONFIRMATION ENGINE RACING PATTERN
Scheme 286: CONFIRMATION ENGINE RACING PATTERN

Scheme 287

Scheme 287
Scheme 287
  1. Connect the hand-held tester to the DLC3, or connect the probe of the oscilloscope between terminals OX1, OX2 and E1 of the ECM connector.
  2. Start engine and warm it up with all accessories switched OFF until water temp. is stable.
  3. Race the engine at 2,500 - 3,000 RPM for about 3 min.
  4. After confirming that the waveforms of the oxygen sensor, bank 1 sensor 1 (OX1), oscillate around 0.5 V during feedback to the ECM, check the waveform of the oxygen sensor, bank 1 sensor 2 (OX2). HINT: If there is a malfunction in the system, the waveform of the oxygen sensor, bank 1 sensor 2 (OX2), is almost the same as that of the oxygen sensor, bank 1 sensor 1 (OX1), on the left. There are some cases where, even though a malfunction exists, the MIL may either light up or not light up.

Same as P0442 (see DTC P0442 Evaporative Emission Control System Leak Detected (Small Leak), DTC P0456 Evaporative Emission Control System Leak Detected (Very Small Leak) )

The detailed information is described in "CHECKING MONITOR STATUS" (see PRE-CHECK ).

  1. TID (Test Identification) is assigned to each emission-related component.
  2. TLT (Test Limit Type): 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.
  3. CID (Component Identification) is assigned to each test value.
  4. Unit Conversion is used to calculate the test value indicated on generic OBD scan tools.

TID $02: EVAP - Vacuum Monitor

TLTCIDUnit ConversionDescription of Test ValueDescription of Test Limit
1$01Multiply by 0.0916 (mmHg)Test value of EVAP VSV: Determined by fuel tank pressure change during vacuum introductionMalfunction criterion
1$02Multiply by 0.0458 and subtract 2.93 (mmHg)Test value of bypass VSV (pressure switching valve) and CCV: Determined by fuel tank pressure change at switching over bypass VSV and CCVMalfunction criterion
0$03Multiply by 0.0458 (mmHg)Test value of 0.04 inch leak: Determined by fuel tank pressure changeMalfunction criterion
0$04Multiply by 0.0458 (mmHg)Test value of 0.02 inch leak: Determined by fuel tank pressure changeMalfunction criterion

DESCRIPTION OF TEST VALUE

Scheme 288

Scheme 288: WIRING DIAGRAM
Scheme 288: WIRING DIAGRAM

The detailed information is described in "CHECKING MONITOR STATUS" (see PRE-CHECK ).

  1. TID (Test Identification) is assigned to each emission-related component.
  2. TLT (Test Limit Type): 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.
  3. CID (Component Identification) is assigned to each test value.
  4. Unit Conversion is used to calculate the test value indicated on generic OBD scan tools.
TLTCIDUnit ConversionDescription of Test ValueDescription of Test Limit
1$01Multiply by 0.0916 (mmHg)Test value of EVAP VSV: Determined by fuel tank pressure change during vacuum introductionMalfunction criterion
1$02Multiply by 0.0458 and subtract 2.93 (mmHg)Test value of bypass VSV (pressure switching valve) and CCV: Determined by fuel tank pressure change at switching over bypass VSV and CCVMalfunction criterion
0$03Multiply by 0.0458 (mmHg)Test value of 0.04 inch leak: Determined by fuel tank pressure changeMalfunction criterion
0$04Multiply by 0.0458 (mmHg)Test value of 0.02 inch leak: Determined by fuel tank pressure changeMalfunction criterion

CHECKING MONITOR STATUS

Scheme 289

Scheme 289: Hand held tester
Scheme 289: Hand held tester

Scheme 290

Scheme 290
Scheme 290

Scheme 291

Scheme 291
Scheme 291

Scheme 292

Scheme 292
Scheme 292

Scheme 293

Scheme 293
Scheme 293

Scheme 294

Scheme 294
Scheme 294
  1. Check that fuel tank cap meets OEM specifications. NG : Replace with a cap that meets OEM specifications. OK : Go to next step.
  2. Check that fuel tank cap is correctly installed. NG : Correctly install fuel tank cap. OK : Go to next step.
  3. Check fuel tank cap (See «INSPECTION»(ref-206125-S08304753912006073100000) ). NG : Replace fuel tank cap. OK : Go to next step.
  4. Check filler neck for damage. PREPARATION: Remove the fuel tank cap. CHECK: Visually inspect the filler neck for damage. NG : Replace filler pipe. OK : Go to next step.
  5. Check purge flow. PREPARATION: Connect the hand-held tester to the DLC3. Select the "ENHANCED OBD II/ACTIVE TEST" mode on the hand-held tester. Disconnect the vacuum hose for the EVAP VSV from the charcoal canister. Start the engine. Select the item "EVAP VSV (ALON)/ALL" in the ACTIVE TEST and operate EVAP VSV (Press the right or left button). CHECK: When the EVAP VSV is operated by the hand-held tester, check whether the disconnected hose applies suction to your finger. OK: VSV is ON: Disconnected hose applies suction to your finger. VSV is OFF: Disconnected hose applies no suction to your finger. OK : Go to step 9 . NG : Go to next step.
  6. Check vacuum hose between intake manifold and EVAP VSV, and EVAP VSV and charcoal canister. CHECK: Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection. Check the vacuum hose for cracks, hole, damage and blockage. NG : Repair or replace vacuum hose. OK : Go to next step.
  7. Check operation of EVAP VSV (See VSV For Evaporative Emission (EVAP) ). NG : Replace EVAP VSV. OK : Go to next step.
  8. Check for open and short in harness and connector between EFI main relay (Marking: EFI) and EVAP VSV, and EVAP VSV and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). NG : Repair or replace harness or connector. OK : Replace ECM (See Engine Control Module (ECM) ).
  9. Check CCV. PREPARATION: Disconnect the vacuum hose for the CCV from the charcoal canister. Turn the ignition switch ON and push the hand-held tester main switch ON. Select the "ENHANCED OBD II/ACTIVE TEST" mode on the hand-held tester. Select the item "CAN CTRL VSV/ALL" in the ACTIVE TEST and operate CAN CTRL VSV (Press the right or left button). CHECK: Check the VSV operation when it is operated by the hand-held tester. OK: VSV is ON: Air does not flow from port E to port F. VSV is OFF: Air from port E flows out through port F. OK : Go to step 13 . NG : Go to next step.
  10. Check vacuum hose between CCV and charcoal canister. CHECK: Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection. Check the vacuum hose for cracks, hole damage and blockage. NG : Repair or replace vacuum hose. OK : Go to next step.
  11. Check operation of CCV (See VSV For Canister Closed Valve (CCV) ). NG : Replace CCV. OK : Go to next step.
  12. Check for open and short in harness and connector between EFI main relay (Marking: EFI) and CCV, and CCV and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). NG : Repair or replace harness or connector. OK : Replace ECM (See Engine Control Module (ECM) ).
  13. Check pressure switching valve. PREPARATION: Turn the ignition switch ON and push the hand-held tester main switch ON. Select the "ENHANCED OBD II/ACTIVE TEST" mode on the hand-held tester. Select the item "TANK BYPASS VSV/ALL" in the ACTIVE TEST and operate TANK BYPASS VSV (Press the right or left button). Check the VSV operation when it is operated by the hand-held tester. CHECK: Check the VSV operation when it is operated by the hand-held tester. OK: VSV is ON: Air from port E flows out through port F. VSV is OFF: Air does not flow from port E to port F. OK : Go to step 16 . NG : Go to next step.
  14. Check operation of pressure switching valve (See VSV For Pressure Switching Valve ). NG : Replace pressure switching valve. OK : Go to next step.
  15. Check for open and short in harness and connector between EFI main relay (Marking: EFI) and pressure switching valve, and pressure switching valve and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). NG : Repair or replace harness or connector. OK : Replace ECM (See Engine Control Module (ECM) ).
  16. Check whether hose close to fuel tank has been modified, and check whether there are signs of any accident near fuel tank. CHECK: Check for cracks, deformation and loose connection of the following parts: Fuel tank Fuel tank filler pipe Hoses and tubes around fuel tank NG : Repair or replace evaporative emission leak part. OK : Go to next step.
  17. Check vacuum hoses between vapor pressure sensor and fuel tank, and charcoal canister and pressure switching valve. CHECK: Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection. Check the vacuum hose for cracks, hole and damage. NG : Repair or replace vacuum hose. OK : Go to next step.
  18. Check hose and tube between fuel tank and charcoal canister. CHECK: Check for proper connection of the fuel tank and fuel evap pipe (See «PARTS LAYOUT AND SCHEMATIC DRAWING»(ref-206125-S22456243822006073100000) ), fuel evap pipe and fuel tube under the floor, fuel tube under the floor and charcoal canister. Check the hose and tube for cracks, hole and damage. NG : Repair or replace hose and tube. OK : Go to next step.
  19. Check voltage between terminals VC and E2 of ECM connector. CHECK: Remove the ECM cover. Turn the ignition switch ON. CHECK: Measure the voltage between terminals VC and E2 of the ECM connector. OK: Voltage: 4.5 to 5.5 V NG : Replace ECM (See Engine Control Module (ECM) ). OK : Go to next step.
  20. Check voltage between terminals PTNK and E2 of ECM connectors. PREPARATION: Remove the ECM cover. Turn the ignition switch ON. CHECK: Measure the voltage between terminals PTNK and E2 of the ECM connectors at following condition (1) and (2). Disconnect the vacuum hose from the vapor pressure sensor. Using the MITYVAC (Hand-Held Vacuum Pump), apply a vacuum of 4.0 kPa (30 mmHg, 1.18 in.Hg) to the vapor pressure sensor. NOTE: Vacuum applied to vapor pressure sensor must be less than 66.7 kPa (500 mmHg, 19.7 in.Hg). OK: Condition (1) Voltage: 2.9 to 3.7 V Condition (2) Voltage: 0.5 V or less OK : Go to step 22 . NG : Go to next step.
  21. Check for open and short in harness and connector between vapor pressure sensor and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). NG : Repair or replace harness or connector. OK : Replace ECM (See Engine Control Module (ECM) ).
  22. Check fuel tank inlet valve. NG : Replace fuel tank inlet valve. OK : Go to next step.
  23. Check fuel tank. NG : Replace fuel tank. OK : Go to next step.
  24. Check charcoal canister for cracks, hole and damage. NG : Repair or replace charcoal canister. OK : Replace ECM (See Engine Control Module (ECM) ).

Scheme 295

Scheme 295: OBD II scan tool (excluding hand-held tester)
Scheme 295: OBD II scan tool (excluding hand-held tester)

Scheme 296

Scheme 296
Scheme 296

Scheme 297

Scheme 297
Scheme 297

Scheme 298

Scheme 298
Scheme 298

Scheme 299

Scheme 299
Scheme 299

Scheme 300

Scheme 300
Scheme 300
  1. Check that fuel tank cap meets OEM specifications. NG: Replace with a cap that meets OEM specifications. OK: Go to next step.
  2. Check that fuel tank cap is correctly installed. NG: Correctly install fuel tank cap. OK: Go to next step.
  3. Check fuel tank cap (See «INSPECTION»(ref-206125-S08304753912006073100000) ). NG: Replace fuel tank cap. OK: Go to next step.
  4. Check filler neck for damage. PREPARATION: Remove the fuel tank cap. CHECK: Visually inspect the filler neck for damage. NG: Replace filler pipe. OK: Go to next step.
  5. Check whether hose close to fuel tank has been modified, and check whether there are signs of any accident near fuel tank or charcoal canister. CHECK: Check for cracks, deformation and loose connection of the following parts: Fuel tank Charcoal canister Fuel tank filler pipe Hoses and tubes around fuel tank and charcoal canister NG: Repair or replace evaporative emission leak part. OK: Go to next step.
  6. Check vacuum hoses between vapor pressure sensor and fuel tank, charcoal canister and pressure switching valve, and pressure switching valve and charcoal canister. CHECK: Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection. Check the vacuum hose for cracks, hole and damage. NG: Repair or replace vacuum hose. OK: Go to next step.
  7. Check hose and tube between fuel tank and charcoal canister. CHECK: Check for proper connection of the fuel tank and fuel evap pipe (See «PARTS LAYOUT AND SCHEMATIC DRAWING»(ref-206125-S22456243822006073100000) ), fuel evap pipe and fuel tube under the floor, fuel tube under the floor and charcoal canister. Check the hose and tube for cracks, hole and damage. NG: Repair or replace hose and tube. OK: Go to next step.
  8. Check vacuum hoses ((8), (9), (10) and (11) in see scheme 246 in circuit description). CHECK: Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection. Check the vacuum hose for cracks, hole damage, and blockage. NG: Repair or replace vacuum hose. OK: Go to next step.
  9. Check connector for EVAP VSV, connector for CCV, connector for pressure switching valve and vapor pressure sensor connector for looseness and disconnection. NG: Repair or connect or sensor connector. OK: Go to next step.
  10. Check charcoal canister for cracks, hole and damage. NG: Check and replace charcoal canister. OK: Go to next step.
  11. Check voltage between terminals VC and E2 of ECM connector. CHECK: Remove the ECM cover. Turn the ignition switch ON. CHECK: Measure the voltage between terminals VC and E2 of the ECM connector. OK: Voltage: 4.5 to 5.5 V NG: Replace ECM (See Engine Control Module (ECM) ). OK: Go to next step.
  12. Check voltage between terminals PTNK and E2 of ECM connectors. PREPARATION: Remove the ECM cover. Turn the ignition switch ON. CHECK: Measure the voltage between terminals PTNK and E2 of the ECM connectors at following condition (1) and (2). Disconnect the vacuum hose from the vapor pressure sensor at following condition (1) and (2). Using the MITYVAC (Hand-Held Vacuum Pump), apply a vacuum of 4.0 kPa (30 mmHg, 1.18 in.Hg) to the vapor pressure sensor. NOTE: Vacuum applied to vapor pressure sensor must be less than 66.7 kPa (500 mmHg, 19.7 in.Hg). OK: Condition (1) Voltage: 2.9 to 3.7 V Condition (2) Voltage: 0.5 V or less OK: Go to step 14. NG: Go to next step.
  13. Check for open and short in harness and connector between vapor pressure sensor and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See Engine Control Module (ECM) ).
  14. Check EVAP VSV. PREPARATION: Remove the ECM cover. Turn the ignition switch ON. CHECK: Check VSV function. Connect between terminal EVP1 of the ECM connector and body ground (VSV ON). Disconnect between terminal EVP1 of the ECM connector and body ground (VSV OFF). OK: VSV is ON: Air from port E flows out through port F. VSV is OFF: Air does not flow from port E to port F. OK: Go to step 17. NG: Go to next step.
  15. Check operation of EVAP VSV (See VSV For Evaporative Emission (EVAP) ). NG: Replace EVAP VSV. OK: Go to next step.
  16. Check for open and short in harness and connector between EFI main relay (Marking: EFI) and EVAP VSV, and EVAP VSV and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ) NG: Repair or replace harness or connector. OK: Replace ECM (See Engine Control Module (ECM) ).
  17. Check CCV. PREPARATION: Remove the ECM cover. Turn the ignition switch ON. CHECK: Check the VSV function. Connect between terminal CCV of the ECM connector and body ground (VSV ON). Disconnect between terminal CCV of the ECM connector and body ground (VSV OFF). OK: VSV is ON: Air does not flow from port E to port F. VSV is OFF: Air from port E flows out through port F. OK: Go to step 20. NG: Go to next step.
  18. Check operation of CCV (See VSV For Canister Closed Valve (CCV) ). NG: Replace CCV. OK: Go to next step.
  19. Check for open and short in harness and connector between EFI main relay (Marking: EFI) and CCV, and CCV and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See Engine Control Module (ECM) ).
  20. Check pressure switching valve. PREPARATION: Remove the ECM cover. Turn the ignition switch ON. CHECK: Check the VSV function. Connect between terminal TBP of the ECM connector and body ground (VSV ON). Disconnect between terminal TBP of the ECM connector and body ground (VSV OFF). OK: VSV is ON: Air from port E flows out through port F. VSV is OFF: Air does not flow from port E to port F. OK: Go to step 23. NG: Go to next step.
  21. Check operation of pressure switching valve (See VSV For Pressure Switching Valve ). NG: Replace pressure switching valve. OK: Go to next step.
  22. Check for open and short in harness and connector between EFI main relay (Marking: EFI) and pressure switching valve, and pressure switching valve and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See Engine Control Module (ECM) ).
  23. Check fuel tank inlet valve. NG: Replace fuel tank inlet valve. OK: Go to next step.
  24. Check fuel tank. NG: Replace fuel tank. OK: It is likely that vehicle user did not properly close fuel tank cap.
Detection CriteriaThreshold
Vehicle speed sensor signalNo pulse input

TYPICAL MALFUNCTION THRESHOLDS

Scheme 301

Scheme 301: WIRING DIAGRAM
Scheme 301: WIRING DIAGRAM
Detection CriteriaThreshold
Battery voltageLess than 3.5 V

TYPICAL MALFUNCTION THRESHOLDS

Scheme 302

Scheme 302: WIRING DIAGRAM
Scheme 302: WIRING DIAGRAM
Detection CriteriaThreshold
Starter signalON (at "more than 20 km/h (12.4 mph) and more than 1,000 RPM")

TYPICAL MALFUNCTION THRESHOLDS

Scheme 303

Scheme 303: WIRING DIAGRAM
Scheme 303: WIRING DIAGRAM

More articles — Engine Controls (1ZZ-FE) - Diagnostics