Engine Control (Sfi) System (Diagnostic Codes (P0327-P1451)) (Phv): Diagnosis Toyota Prius III

INSPECTION PROCEDURE

HINT

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

Scheme 547

Scheme 548

1. READ VALUE USING TECHSTREAM (KNOCK FEEDBACK VALUE) Connect the Techstream to the DLC3. Turn the power switch on (IG) and turn the Techstream on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(ref-393299-S13482363572011040700000) . Start the engine. Warm up the engine. Enter the following menus: Powertrain / Engine and ECT / Knock Feedback Value. Read the value while driving the vehicle. OK The value changes. HINT: Malfunction does not occur Knock Feedback Value changes Malfunctions occur Knock Feedback Value does not change The knock feedback value change can be confirmed by running the engine with a high load, for example, by activating the air conditioning system and racing the engine. NG --> See step 2 OK --> See step 5
2. INSPECT ECM (KNK1 VOLTAGE) Disconnect the knock control sensor connector. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition G1-2 - G1-1 Power switch on (IG) 4.5 to 5.5 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Knock Control Sensor) Reconnect the knock control sensor connector. NG --> See step 4 OK: Go to next step
3. INSPECT KNOCK CONTROL SENSOR Remove the knock control sensor. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1 - 2 20°C (68°F) 120 to 280 kohms TEXT IN ILLUSTRATION *1 Ohmmeter *a Component without harness connected (Knock Control Sensor) Reinstall the knock control sensor. NG --> See step 7 OK --> See step 6
4. CHECK HARNESS AND CONNECTOR (ECM - KNOCK CONTROL SENSOR) Disconnect the knock control sensor connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition G1-2 - D28-87 (KNK1) Always Below 1 ohms G1-1 - D28-110 (EKNK) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition G1-2 or D28-87 (KNK1) - Body ground Always 10 kohms or higher G1-1 or D28-110 (EKNK) - Body ground Always 10 kohms or higher Reconnect the knock control sensor connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - KNOCK CONTROL SENSOR) OK --> See step 6
5. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(ref-393417-S08075097832011040700000)
6. REPLACE ECM. Refer to «REMOVAL»(ref-393423-S41700152002011040700000)
7. REPLACE KNOCK CONTROL SENSOR. Refer to «REMOVAL»(ref-393423-S13334063602011040700000)

HINT

1. If no problem is found through this diagnostic troubleshooting procedure, troubleshoot the engine mechanical systems.
2. Check the engine speed. The engine speed can be checked using the Techstream. To check, follow the operation below: Connect the Techstream to the DLC3. Turn the power switch on (IG) and turn the Techstream on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(ref-393299-S13482363572011040700000) . Start the engine. Enter the following menus: Powertrain / Engine and ECT / Data List / Engine Speed. The engine speed may be indicated as zero despite the engine rotating normally. This is caused by a lack of NE signals from the crankshaft position sensor. Alternatively, the engine speed may be indicated as lower than the actual engine speed if the crankshaft position sensor output voltage is insufficient.
3. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

Scheme 549

Scheme 550

1. READ VALUE USING TECHSTREAM (ENGINE SPEED) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(ref-393299-S13482363572011040700000) . Enter the following menus: Powertrain / Engine and ECT / Data List / Engine Speed. Start the engine. Read the values displayed on the Techstream while the engine is running. OK Correct values are displayed. HINT: To check the engine speed change, display the graph on the Techstream. If the engine does not start, check the engine speed while cranking. If the engine speed indicated on the Techstream remains at zero (0), there may be an open or short in the crankshaft position sensor circuit. NG --> See step 2 OK --> See step 8
2. INSPECT CRANKSHAFT POSITION SENSOR (RESISTANCE) Disconnect the crankshaft position sensor connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1 (NE) - 2 (NE-) Cold 1630 to 2740 ohms 1 (NE) - 2 (NE-) Hot 2065 to 3225 ohms HINT: "Cold" and "Hot" mean the temperature of the coils themselves. "Cold" is from -10 to 50°C (14 to 122°F) and "Hot" is from 50 to 100°C (122 to 212°F). If the resistance is not as specified, replace the sensor. TEXT IN ILLUSTRATION *a Component without harness connected (Crankshaft Position Sensor) Reconnect the crankshaft position sensor connector. NG --> See step 9 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM) Disconnect the crankshaft position sensor connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition D27-1 (NE) - D28-74 (NE+) Always Below 1 ohms D27-2 (NE-) - D28-120 (NE-) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D27-1 (NE) or D28-74 (NE+) - Body ground Always 10 kohms or higher D27-2 (NE-) or D28-120 (NE-) - Body ground Always 10 kohms or higher Reconnect the crankshaft position sensor connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM) OK: Go to next step
4. CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR) Check the crankshaft position sensor installation. OK Sensor is installed correctly. NG --> See step 10 OK: Go to next step
5. INSPECT NO. 1 CRANKSHAFT POSITION SENSOR PLATE (TEETH OF SENSOR PLATE) Check the teeth of the No. 1 crankshaft position sensor plate. Refer to «COMPONENTS»(ref-393424-S24416498112011040700000) . OK Sensor plate does not have any cracks or deformation. NG --> See step 11 OK: Go to next step
6. REPLACE CRANKSHAFT POSITION SENSOR Replace the crankshaft position sensor. Refer to «REMOVAL»(ref-393423-S18831488322011040700000) . NEXT: Go to next step
7. CHECK WHETHER DTC OUTPUT RECURS Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-393417-S07712997152011040700000) . Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(ref-393299-S13482363572011040700000) . Start the engine. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. Result Result Proceed to DTC is not output A DTC P0335 is output B HINT: If the engine does not start, replace the ECM. B --> See step 12 A --> END
8. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(ref-393417-S08075097832011040700000)
9. REPLACE CRANKSHAFT POSITION SENSOR. Refer to «REMOVAL»(ref-393423-S18831488322011040700000)
10. SECURELY REINSTALL SENSOR. Refer to «REMOVAL»(ref-393423-S18831488322011040700000)
11. REPLACE NO. 1 CRANKSHAFT POSITION SENSOR PLATE. Refer to «DISASSEMBLY»(ref-393424-S14703096482011040700000)
12. REPLACE ECM. Refer to «REMOVAL»(ref-393423-S41700152002011040700000)

HINT

1. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
2. If no problem is found through this diagnostic troubleshooting procedure, troubleshoot the engine mechanical system.

Scheme 551

Scheme 552

Scheme 553

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0340, P0342 AND P0343) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. Result Result Proceed to DTC P0340, P0342 or P0343 is output A DTC P0340, P0342 or P0343 and other DTCs are output B HINT: If any DTCs other than P0340, P0342 and P0343 are output, troubleshoot those DTCs first. B --> See step 11 A: Go to next step
2. INSPECT CAMSHAFT POSITION SENSOR (POWER SOURCE) Disconnect the camshaft position sensor connector. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition D18-3 (VC) - Body ground Power switch on (IG) 4.5 to 5.0 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Camshaft Position Sensor) Reconnect the camshaft position sensor connector. NG --> See step 10 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM) Disconnect the camshaft position sensor connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition D18-1 (VVI+) - D28-76 (G2+) Always Below 1 ohms D18-2 (VVI-) - D28-122 (G2-) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D18-1 (VVI+) or D28-76 (G2+) - Body ground Always 10 kohms or higher D18-2 (VVI-) or D28-122 (G2-) - Body ground Always 10 kohms or higher Reconnect the camshaft position sensor connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (CAMSHAFT POSITION SENSOR - ECM) OK: Go to next step
4. CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR) Check the camshaft position sensor installation. OK Sensor is installed correctly. NG --> See step 12 OK: Go to next step
5. INSPECT INTAKE CAMSHAFT (TIMING ROTOR) Check the timing rotor of the intake camshaft. OK Camshaft timing rotor does not have any cracks or deformation. NG --> See step 13 OK: Go to next step
6. REPLACE CAMSHAFT POSITION SENSOR Replace the camshaft position sensor. Refer to «REMOVAL»(ref-393423-S28940228442011040700000) . NEXT: Go to next step
7. CHECK WHETHER DTC OUTPUT RECURS (P0340, P0342 OR P0343) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-393417-S07712997152011040700000) . Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(ref-393299-S13482363572011040700000) . Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. Result Result Proceed to DTC P0340, P0342 or P0343 is output A DTC is not output B HINT: If the engine does not start, replace the ECM. B --> END A: Go to next step
8. ADJUST VALVE TIMING HINT: There are no marks on the cylinder head to match-up for the purpose of checking valve timing. Valve timing can only be inspected by lining up the colored plates on the timing chain with the marks on the pulleys. It may be necessary to remove and reinstall the chain to match-up the alignment marks. Refer to «DISASSEMBLY»(ref-393424-S14703096482011040700000) . TEXT IN ILLUSTRATION *1 Top *2 Alignment Mark *3 No. 1 Cylinder at TDC Compression NEXT: Go to next step
9. CHECK WHETHER DTC OUTPUT RECURS (P0340, P0342 OR P0343) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-393417-S07712997152011040700000) . Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(ref-393299-S13482363572011040700000) . Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Trouble codes. Read the DTCs. Result Result Proceed to DTC is not output A DTC P0340, P0342 or P0343 is output B HINT: If the engine does not start, replace the ECM. B --> See step 14 A --> END
10. CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM) Disconnect the camshaft position sensor connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition D18-3 (VC) - D28-99 (VCV1) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D18-3 (VC) or D28-99 (VCV1) - Body ground Always 10 kohms or higher Reconnect the camshaft position sensor connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (CAMSHAFT POSITION SENSOR - ECM) OK --> See step 14
11. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-393417-S03455429922011040700000)
12. SECURELY REINSTALL SENSOR. Refer to «REMOVAL»(ref-393423-S28940228442011040700000)
13. REPLACE INTAKE CAMSHAFT. Refer to «REMOVAL»(ref-393424-S01153334242011040700000)
14. REPLACE ECM. Refer to «REMOVAL»(ref-393423-S41700152002011040700000)

Note. Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

Scheme 554

1. CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - BODY GROUND) Disconnect the ignition coil assembly connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition D23-4 (GND) - Body ground Always Below 1 ohms D22-4 (GND) - Body ground Always Below 1 ohms D21-4 (GND) - Body ground Always Below 1 ohms D20-4 (GND) - Body ground Always Below 1 ohms Reconnect the ignition coil assembly connectors. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION COIL ASSEMBLY - BODY GROUND) OK: Go to next step
2. INSPECT IGNITION COIL ASSEMBLY (POWER SOURCE) Disconnect the ignition coil assembly connectors. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition D23-1 (+B) - D23-4 (GND) Power switch on (IG) 11 to 14 V D22-1 (+B) - D22-4 (GND) Power switch on (IG) 11 to 14 V D21-1 (+B) - D21-4 (GND) Power switch on (IG) 11 to 14 V D20-1 (+B) - D20-4 (GND) Power switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Ignition Coil Assembly) Reconnect the ignition coil assembly connectors. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION COIL ASSEMBLY - IG2 RELAY) OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - ECM) Disconnect the ignition coil assembly connectors. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition D23-2 (IGF) - D28-23 (IGF1) Always Below 1 ohms D22-2 (IGF) - D28-23 (IGF1) Always Below 1 ohms D21-2 (IGF) - D28-23 (IGF1) Always Below 1 ohms D20-2 (IGF) - D28-23 (IGF1) Always Below 1 ohms Standard Resistance (Check for Open) Tester Connection Condition Specified Condition D23-3 (IGT1) - D28-108 (IGT1) Always Below 1 ohms D22-3 (IGT2) - D28-107 (IGT2) Always Below 1 ohms D21-3 (IGT3) - D28-106 (IGT3) Always Below 1 ohms D20-3 (IGT4) - D28-105 (IGT4) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D23-2 (IGF) or D28-23 (IGF1) - Body ground Always 10 kohms or higher D22-2 (IGF) or D28-23 (IGF1 - Body ground Always 10 kohms or higher D21-2 (IGF) or D28-23 (IGF1) - Body ground Always 10 kohms or higher D20-2 (IGF) or D28-23 (IGF1) - Body ground Always 10 kohms or higher Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D23-3 (IGT1) or D28-108 (IGT1) - Body ground Always 10 kohms or higher D22-3 (IGT2) or D28-107 (IGT2) - Body ground Always 10 kohms or higher D21-3 (IGT3) or D28-106 (IGT3) - Body ground Always 10 kohms or higher D20-3 (IGT4) or D28-105 (IGT4) - Body ground Always 10 kohms or higher Reconnect the ECM connector. Reconnect the ignition coil assembly connectors. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION COIL ASSEMBLY - ECM) OK: Go to next step
4. CHECK WHETHER DTC OUTPUT RECURS (DTC P0351, P0352, P0353 OR P0354) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-393417-S07712997152011040700000) . Shuffle arrangement of the ignition coil assemblies (among No. 1 to No. 4 cylinders). NOTE: Do not shuffle the connectors. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. Result Result Proceed to Same DTC output A Different ignition coil DTC output B B --> See step 5 A --> See step 6
5. REPLACE IGNITION COIL ASSEMBLY. Refer to «REMOVAL»(ref-393423-S24681311562011040700000)
6. REPLACE ECM. Refer to «REMOVAL»(ref-393423-S41700152002011040700000)

HINT

1. By using the Control the EGR Step Position Active Test, the operation of the EGR valve can be checked.
2. When the engine is idling steadily with the EGR valve fully closed, if the EGR valve is normal and it is opened using the Active Test, the Data List value changes as follows. Data List Change in Data List when Number of Steps is Increased Using Control the EGR Step Position Active Test Engine Speed Idle becomes rough MAP Pressure rises
3. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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.

Scheme 555

Scheme 556

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO P0401) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTC. Result Result Proceed to DTC P0401 is output A DTC P0401 and other DTCs are output B HINT: If any DTCs other than P0401 are output, troubleshoot those DTCs first. B --> See step 12 A: Go to next step
2. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(ref-393299-S13482363572011040700000) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or more. HINT: The A/C switch and all accessory switches should be off and shift lever in P or N. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position. Confirm the Throttle Idle Position is ON and check the engine idling condition and MAP values in the Data List while performing the Active Test. HINT: Do not leave the EGR valve open for 10 seconds or more during the Active Test. Be sure to return the EGR valve to step 0 when the Active Test is completed. Do not open the EGR valve 30 steps or more during the Active Test. OK MAP and idling condition change in response to EGR step position as follows. Standard - EGR Step Position (Active Test) 0 Steps 0 to 30 Steps Idling condition Steady idling Idling changes from steady to rough idling or engine stalls MAP (Data List) - MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed HINT: During Active Test, if the idling condition does not change in response to EGR step position, then there is probably a malfunction in the EGR valve. Result Result Proceed to Within standard range A Outside of standard range B B --> See step 4 A: Go to next step
3. INSPECT EGR VALVE ASSEMBLY Check if the EGR valve are clogged with deposits. Check if the EGR valve is closed. OK EGR valve is closed and no deposits. Result Result Proceed to NG A OK B B --> See step 5 A: Go to next step
4. REPLACE EGR VALVE ASSEMBLY Replace the EGR valve assembly. Refer to «REMOVAL»(ref-393412-S37278285322011040700000) . NEXT: Go to next step
5. CHECK FOR DEPOSIT (INTAKE PORT TO EGR VALVE ASSEMBLY) Check for exhaust leaks at each connection point. Check for cracks, damage, and clogs in the pipes between the intake manifold and the EGR valve assembly. This check may require the removal of components. Check if there is a built-up of deposits in the EGR valve of pipes. OK No deposits. NG --> REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA OK: Go to next step
6. CHECK FOR DEPOSIT (EXHAUST MANIFOLD SUB-ASSEMBLY TO EGR VALVE ASSEMBLY) Check for exhaust leaks at each connection point. Check for cracks, damage, and clogs in the pipes between the exhaust manifold sub-assembly and the EGR valve assembly. This check may require the removal of components. Check if there is a built-up of deposits in the EGR valve of pipes. OK No deposits. NG --> REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA OK: Go to next step
7. INSPECT EGR WITH COOLER PIPE SUB-ASSEMBLY Check for blockage of the EGR with cooler pipe sub-assembly. OK No blockage for the EGR with cooler pipe sub-assembly. NG --> REPAIR OR REPLACE EGR WITH COOLER PIPE SUB-ASSEMBLY OK: Go to next step
8. READ VALUE USING TECHSTREAM (MANIFOLD ABSOLUTE PRESSURE SENSOR) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Data List / MAP. Read the MAP value. Standard Switch Condition Techstream Display Power switch on (IG) 80 to 110 kPa (600 to 825 mmHg) Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(ref-393299-S13482363572011040700000) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or more. Enter the following menus: Powertrain / Engine and ECT / Data List / MAP. Read the MAP value when idling the engine with the A/C switch and all accessory switches should be off and shift lever in P or N. Standard Engine Condition Techstream Display Idling Less than 80 kPa (600 mmHg) Result Result Proceed to NG A OK B B --> See step 11 A: Go to next step
9. CHECK INTAKE SYSTEM Check the intake system for vacuum leaks. Refer to «ON-VEHICLE INSPECTION»(ref-393426-S19662706812011040700000) . OK No leaks in intake system. NG --> REPAIR OR REPLACE INTAKE SYSTEM OK: Go to next step
10. REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR Replace the manifold absolute pressure sensor. Refer to «REMOVAL»(ref-393412-S38654987542011040700000) . NEXT: Go to next step
11. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-393417-S07712997152011040700000) . Turn the power switch off and wait for 30 seconds. Turn the power switch on (IG) and turn the Techstream on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(ref-393299-S13482363572011040700000) . Start the engine and warm it up until the engine coolant temperature reaches 70°C (158°F) or more. HINT: The A/C switch and all accessory switches should be off and shift lever in P or N. Drive the vehicle at 25 to 37 mph (40 to 60 km/h) with the shift lever in B. WARNING: Strictly observe speed limits and traffic laws when performing the confirmation drive pattern. Perform fuel cut operation for 5 seconds or more with the accelerator pedal fully released. HINT: If the deceleration was not completed, perform the Confirmation Driving Pattern again. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending. Read Pending DTC. If the pending DTC is output, the system is malfunctioning. HINT: If a pending DTC is not output, perform the following procedure. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness. Input the DTC: P0401. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit HINT: If a pending DTC is not output and the DTC judgment result is INCOMPLETE or UNKNOWN, drive the vehicle again at 25 to 37 mph (40 to 60 km/h) with the shift lever in B, perform fuel cut operation for 5 seconds or more with the accelerator pedal fully released, and check the DTC judgment result. NEXT --> END
12. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-393417-S03455429922011040700000)

Note. Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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.

Scheme 557

Scheme 558

1. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(ref-393299-S13482363572011040700000) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or more. HINT: The A/C switch and all accessory switches should be off. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position. Confirm the Throttle Idle Position is ON and check the engine idling condition and MAP values in the Data List while performing the Active Test. HINT: Do not leave the EGR valve open for 10 seconds or more during the Active Test. Be sure to return the EGR valve to step 0 when the Active Test is completed. Do not open the EGR valve 30 steps or more during the Active Test. OK MAP and idling condition change in response to EGR step position when Throttle Idle Position is ON in Data List. Standard - EGR Step Position (Active Test) 0 Steps 0 to 30 Steps Idling condition Steady idling Idling changes from steady to rough idling MAP (Data List) MAP value is 20 to 40 kPa (150 to 300 mmHg) (EGR valve is fully closed) MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed HINT: During Active Test, if the idling condition does not change in response to EGR step position, then there is probably a malfunction in the EGR valve. Result Result Proceed to Within standard range A Outside of standard range B B --> See step 2 A --> See step 6
2. INSPECT EGR VALVE ASSEMBLY Disconnect the EGR valve assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2 (+B1) - 3 (EGR2) 20 °C (68 °F) 18 to 22 ohms 2 (+B1) - 1 (EGR4) 5 (+B2) - 4 (EGR1) 5 (+B2) - 6 (EGR3) TEXT IN ILLUSTRATION *a Component without harness connected (EGR Valve Assembly) Reconnect the EGR valve assembly connector. NG --> See step 7 OK: Go to next step
3. INSPECT EGR VALVE ASSEMBLY (+B1 OR +B2 VOLTAGE) Disconnect the EGR valve assembly connector. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition D10-2 (+B1) - Body ground Power switch on (IG) 11 to 14 V D10-5 (+B2) - Body ground TEXT IN ILLUSTRATION *a Front view of wire harness connector (to EGR Valve Assembly) Reconnect the EGR valve assembly connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (EGR VALVE ASSEMBLY - EFI MAIN RELAY) OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (ECM - EGR VALVE ASSEMBLY) Disconnect the EGR valve assembly connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition D28-45 (EGR1) - D10-4 (EGR1) Always Below 1 ohms D28-44 (EGR2) - D10-3 (EGR2) D28-43 (EGR3) - D10-6 (EGR3) D28-42 (EGR4) - D10-1 (EGR4) Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D28-45 (EGR1) or D10-4 (EGR1) - Body ground Always 10 kohms or higher D28-44 (EGR2) or D10-3 (EGR2) - Body ground D28-43 (EGR3) or D10-6 (EGR3) - Body ground D28-42 (EGR4) or D10-1 (EGR4) - Body ground Reconnect the ECM connector. Reconnect the EGR valve assembly connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - EGR VALVE ASSEMBLY) OK: Go to next step
5. CHECK DTC OUTPUT RECORDS (DTC P0403) Connect the Techstream to the DLC3. Turn the power switch on (IG) and turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-393417-S07712997152011040700000) . Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(ref-393299-S13482363572011040700000) . Start the engine warm it up. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. Result Result Proceed to DTC is not output A DTC P0403 is output B B --> See step 8 A --> END
6. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(ref-393417-S08075097832011040700000)
7. REPLACE EGR VALVE ASSEMBLY. Refer to «REMOVAL»(ref-393412-S37278285322011040700000)
8. REPLACE ECM. Refer to «REMOVAL»(ref-393423-S41700152002011040700000)

CONDITIONING FOR SENSOR TESTING

HINT

Perform the operation with the engine speeds and time durations described below prior to checking the waveforms of the air fuel ratio sensor and heated oxygen sensor. This is in order to activate the sensors sufficiently to obtain the appropriate inspection results.

Scheme 559

1. (a) Connect the Techstream to the DLC3 [A].
2. (b) Turn the power switch on (IG) and turn the Techstream on [B].
3. (c) Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(ref-393299-S13482363572011040700000) [C].
4. (d) Start the engine and warm it up with all the accessories switched off until the engine coolant temperature stabilizes [D].
5. (e) Run the engine at an engine speed of between 2500 rpm for at least 3 minutes [E].
6. (f) While running the engine at 2500 rpm for 2 seconds and 1500 rpm for 2 seconds, check the waveforms of the air fuel ratio and heated oxygen sensors using the Techstream [F].

HINT

1. If either of the voltage outputs of the air fuel ratio or heated oxygen sensor does not fluctuate, or there is noise in the waveform of either sensor, the sensor may be malfunctioning.
2. If the voltage outputs of both the sensors remain lean or rich, the air fuel ratio may be extremely lean or rich. In such cases, perform the Active Test operation by entering the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F sensor.
3. If the three-way catalytic converter has deteriorated, the heated oxygen sensor (located behind the three-way catalytic converter) voltage output fluctuates up and down frequently, even under normal driving conditions (active air fuel ratio control is not performed).

Scheme 560

Scheme 561

Scheme 562

Scheme 563

1. AIR FUEL RATIO CONTROL HINT: Malfunctioning areas can be identified by performing the Control the Injection Volume for A/F Sensor function provided in the Active Test. The Control the Injection Volume for A/F Sensor function can help to determine whether the air fuel ratio sensor, heated oxygen sensor and other potential trouble areas are malfunctioning. The following instructions describe how to conduct the Control the Injection Volume for A/F Sensor operation using the Techstream. Connect the Techstream to the DLC3. Turn the power switch on (IG) and turn the Techstream on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(ref-393299-S13482363572011040700000) . Start the engine. Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor. Perform the Active Test operation with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume). Monitor the voltage outputs of the air fuel ratio and heated oxygen sensors (AFS Voltage B1S1 and O2S B1S2) displayed on the Techstream. HINT: The Control the Injection Volume for A/F Sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%. Each sensor reacts in accordance with increases and decreases in the fuel injection volume. Techstream Display (Sensor) Injection Volume Status Voltage AFS Voltage B1S1 (Air fuel ratio) +25% Rich Less than 3.1 V AFS Voltage B1S1 (Air fuel ratio) -12.5% Lean More than 3.4 V O2S B1S2 (Heated oxygen) +25% Rich More than 0.55 V O2S B1S2 (Heated oxygen) -12.5% Lean Less than 0.4 V NOTE: The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds. Case Air Fuel Ratio Sensor (Sensor 1) Output Voltage Heated Oxygen Sensor (Sensor 2) Output Voltage Main Suspected Trouble Area 1 - 2 Air fuel ratio sensor Air fuel ratio sensor heater Air fuel ratio sensor circuit 3 Heated oxygen sensor Heated oxygen sensor heater Heated oxygen sensor circuit Exhaust gas leaks 4 Fuel pressure Exhaust gas leaks (Air fuel ratio extremely lean or rich) Following the Control the Injection Volume for A/F Sensor procedure enables technicians to check and graph the voltage outputs of both the air fuel ratio and heated oxygen sensors. To display the graph, enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor / A/F Control System / AFS Voltage B1S1 and O2S B1S2. HINT: Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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.

DTC SUMMARY

HINT

The reference orifice is located inside the canister pump module.

Refer to the EVAP System. Refer to INSPECTION PROCEDURE .

HINT

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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.

HINT

The canister pressure sensor is built into the canister pump module.

Note. When a vehicle is brought into the workshop, leave it as it is. Do not change the vehicle condition. For example, do not tighten the fuel cap. Do not disassemble the canister pump module. The Techstream is required to conduct the following diagnostic troubleshooting procedure.

Scheme 564

Scheme 565

Scheme 566

1. CONFIRM DTC AND EVAP PRESSURE Connect the Techstream to the DLC3. Turn the power switch on (IG) (do not start the engine). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. Enter the following menus: Powertrain / Engine and ECT / Data List / Vapor Pressure Pump. Read the EVAP (evaporative emission) pressure displayed on the Techstream. Result Display (DTC Output) Result Suspected Trouble Area Proceed to P0451 - Canister pressure sensor C P0452 Less than 45 kPa (337 mmHg) Wire harness/connector (ECM - canister pressure sensor) Canister pressure sensor Short in ECM circuit A P0453 More than 120 kPa (901 mmHg) Wire harness/connector (ECM - canister pressure sensor) Canister pressure sensor Open in ECM circuit B C --> See step 4 B --> See step 5 A: Go to next step
2. CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM) Turn the power switch off. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Result Tester Connection Condition Specified Condition Suspected Trouble Area Proceed to D28-114 (PPMP) - Body ground Always Below 10 ohms Wire harness/connector (ECM - canister pressure sensor) Short in canister pressure sensor circuit A 10 kohms or higher Wire harness/connector (ECM - canister pressure sensor) Short in ECM circuit B Reconnect the ECM connector. B --> See step 9 A: Go to next step
3. CHECK HARNESS AND CONNECTOR (NO. 3 FRAME WIRE - ECM) Disconnect the No. 3 frame wire from the floor wire side connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Result Tester Connection Condition Specified Condition Suspected Trouble Area Proceed to D28-114 (PPMP) - Body ground Always 10 kohms or higher Short in canister pressure sensor circuit A Below 10 ohms Short in wire harness/connector (ECM - canister pressure sensor) B Reconnect the No. 3 frame wire to the floor wire side connector. Reconnect the ECM connector. B --> See step 8 A --> See step 6
4. GO TO EVAP SYSTEM. Refer to «EVAP System»(ref-393419-S37940908042011040700000)
5. CHECK HARNESS AND CONNECTOR (NO. 3 FRAME WIRE - ECM) Disconnect the No. 3 frame wire from the floor wire side connector. Turn the power switch on (IG). Measure the voltage and resistance according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition R45-6 (VCC) - Body ground Power switch on (IG) 4.5 to 5.5 V R45-7 (VOUT) - Body ground Power switch on (IG) 4.5 to 5.5 V Standard Resistance (Check for Open) Tester Connection Condition Specified Condition R45-8 (SGND) - Body ground Always Below 100 ohms TEXT IN ILLUSTRATION *a Front view of wire harness connector (to No. 3 Frame Wire) Result Result Suspected Trouble Area Proceed to Voltage and resistance within standard ranges Open in canister pressure sensor circuit A Voltage and resistance outside standard ranges Open in wire harness/connector (ECM - canister pressure sensor) B Reconnect the No. 3 frame wire to the floor wire side connector. B --> See step 8 A: Go to next step
6. CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - FLOOR WIRE) Disconnect the No. 3 frame wire from the canister pump module and floor wire side connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition No. 3 frame wire canister pump module side terminal 6 - R45-6 (VCC) Always Below 1 ohms No. 3 frame wire canister pump module side terminal 7 - R45-7 (VOUT) Always Below 1 ohms No. 3 frame wire canister pump module side terminal 8 - R45-8 (SGND) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition No. 3 frame wire canister pump module side terminal 6 or R45-6 (VCC) - Body ground Always 10 kohms or higher No. 3 frame wire canister pump module side terminal 7 or R45-7 (VOUT) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *a Front view of the wire harness connector (to Canister Pump Module) *b Front view of the wire harness connector (to Floor Wire) Reconnect the No. 3 frame wire to the canister pump module and floor wire side connector. NG --> See step 10 OK: Go to next step
7. REPLACE CANISTER Replace the canister. Refer to «REMOVAL»(ref-393412-S26183763292011040700000) . NOTE: When replacing the canister, check the canister pump module interior and related pipes for water, fuel and other liquids. If liquids are present, check for disconnections and/or cracks in the following: 1) the pipe from the air inlet port to the canister pump module; 2) the canister filter; and 3) the fuel tank vent hose. TEXT IN ILLUSTRATION *1 Fuel Tank Vent Hose *2 Vent Hose *3 Air Inlet Port *4 Inspection Area (Check for Disconnection and/or Cracks) *5 Canister *6 Fuel Tank NEXT --> See step 11
8. REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 3 FRAME WIRE - ECM) Repair or replace harness or connector. NEXT --> See step 11
9. REPLACE ECM Replace the ECM. Refer to «REMOVAL»(ref-393423-S41700152002011040700000) . NEXT --> See step 11
10. REPAIR OR REPLACE HARNESS OR CONNECTOR (CANISTER PUMP MODULE - FLOOR WIRE) Repair or replace harness or connector. NEXT: Go to next step
11. CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-393417-S07712997152011040700000) . Turn the power switch off and wait for 30 seconds. Turn the power switch on (IG) and turn the Techstream on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(ref-393299-S13482363572011040700000) . Start the engine and warm it up. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness. Input the DTC: P0451, P0452 or P0453. Check the DTC judgment result. HINT: If DTC judgment result is NORMAL, the repair has been successfully completed. NEXT --> END

HINT

1. The following conditions may also cause DTC P0505 to be set: The floor carpet overlapping slightly onto the accelerator pedal, causing the accelerator pedal to be slightly depressed and therefore the throttle valve position to be slightly open. The accelerator pedal being not fully released.
2. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

HINT

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

HINT

1. DTC P050B may be set when the engine shows the symptom as listed below. If necessary, check the trouble area as listed below. Symptom Factor Trouble Area Low idle speed at engine cold. Excessive engine friction Engine oil deterioration Rough idle at engine cold. Abnormal combustion Fuel quality
2. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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.

Note. Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

HINT

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

HINT

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

HINT

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

Refer to the EVAP System. Refer to INSPECTION PROCEDURE .

Scheme 567

Scheme 568

1. P1420: EVAP (evaporative emission) small leak In operation C, the leak detection pump creates negative pressure (vacuum) in the EVAP system and the EVAP system pressure is measured. If the stabilized system pressure is higher than the second reference pressure, the ECM determines that the EVAP system has a small leakage, illuminates the MIL and sets the DTC (2 trip detection logic).
2. P1421: EVAP gross leak In operation C, the leak detection pump creates negative pressure (vacuum) in the EVAP system and the EVAP system pressure is measured. If the stabilized system pressure is higher than [second reference pressure x 0.2] (near atmospheric pressure), the ECM determines that the EVAP system has a large leakage, illuminates the MIL and sets the DTC (2 trip detection logic).

Refer to the EVAP System. Refer to INSPECTION PROCEDURE .

Scheme 569

1. P1422: Fuel tank small leak In operation G, the leak detection pump creates negative pressure (vacuum) in the fuel tank and the fuel tank pressure is measured. If the stabilized system pressure is higher than the third reference pressure, the ECM determines that the fuel tank has a small leakage. The ECM illuminates the MIL and sets the DTC (2 trip detection logic).
2. P1423: Fuel tank gross leak In operation G, the leak detection pump creates negative pressure (vacuum) in the fuel tank and the fuel tank pressure is measured. If the stabilized system pressure is higher than [third reference pressure x 0.2] (near atmospheric pressure), the ECM determines that the fuel tank has a large leakage. The ECM illuminates the MIL and sets the DTC (2 trip detection logic).

Note. When a vehicle is brought into the workshop, leave it as it is. Do not change the vehicle condition. For example, do not tighten the fuel tank cap. Do not disassemble the canister pump module. The Techstream is required to conduct the following diagnostic troubleshooting procedure.

Scheme 570

Scheme 571

1. CONFIRM DTC AND FUEL TANK PRESSURE Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. Enter the following menus: Powertrain / Engine and ECT / Data List / Vapor Pressure Tank. Read the EVAP (evaporative emission) pressure displayed on the Techstream. Result Display (DTC Output) Result Suspected Trouble Area Proceed to P1451 - Pressure sensor C P1452 Less than -17.187 kPa (-128.93 mmHg) Wire harness/connector (ECM - fuel tank pressure sensor) Fuel tank pressure sensor Short in ECM circuit A P1453 More than 23.937 kPa (179.58 mmHg) Wire harness/connector (ECM - fuel tank pressure sensor) Fuel tank pressure sensor Open in ECM circuit B C --> See step 11 B --> See step 4 A: Go to next step
2. CHECK HARNESS AND CONNECTOR (FUEL TANK PRESSURE SENSOR - ECM) Turn the power switch off. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Result Tester Connection Condition Result Suspected Trouble Area Proceed to D28-77 (PTNK) - Body ground Always 10 ohms or less Wire harness/connector (ECM - fuel tank pressure sensor) Short in fuel tank pressure sensor circuit A 10 kohms or more Wire harness/connector (ECM - fuel tank pressure sensor) Short in ECM circuit B Reconnect the ECM connector. B --> See step 9 A: Go to next step
3. CHECK HARNESS AND CONNECTOR (NO. 3 FRAME WIRE - ECM) Disconnect the No. 3 frame wire from the floor wire side connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Result Tester Connection Condition Result Suspected Trouble Area Proceed to D28-77 (PTNK) - Body ground Always 10 kohms or higher Short in fuel tank pressure sensor circuit A Below 10 ohms Short in wire harness/connector (ECM - fuel tank pressure sensor) B Reconnect the No. 3 frame wire to the floor wire side connector. Reconnect the ECM connector. B --> See step 7 A: Go to next step
4. CHECK HARNESS AND CONNECTOR (NO. 3 FRAME WIRE - BODY GROUND) Disconnect the No. 3 frame wire from the floor wire side connector. Turn the power switch on (IG). Measure the voltage and resistance according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition R45-2 (VC) - Body ground Power switch on (IG) 4.5 to 5.5 V Standard Resistance (Check for Open) Tester Connection Condition Specified Condition R45-10 (E2) - Body ground Always Below 100 ohms Result Result Suspected Trouble Area Proceed to Voltage and resistance within standard ranges Open in fuel tank pressure sensor circuit A Voltage and resistance outside standard ranges Open in wire harness/connector (ECM - fuel tank pressure sensor) B TEXT IN ILLUSTRATION *a Front view of wire harness connector (to No. 3 Frame Wire) Reconnect the No. 3 frame wire to the floor wire side connector. B --> See step 7 A: Go to next step
5. CHECK HARNESS AND CONNECTOR (FUEL TANK PRESSURE SENSOR - FLOOR WIRE) Disconnect the No. 3 frame wire from the fuel tank pressure sensor and floor wire side connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition No. 3 frame wire fuel tank pressure sensor side terminal 3 - R45-2 (VC) Always Below 1 ohms No. 3 frame wire fuel tank pressure sensor side terminal 2 - R45-9 (PTNK) Always Below 1 ohms No. 3 frame wire fuel tank pressure sensor side terminal 1 - R45-10 (E2) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition No. 3 frame wire fuel tank pressure sensor side terminal 3 or R45-2 (VC) - Body ground Always 10 kohms or higher No. 3 frame wire fuel tank pressure sensor side terminal 2 or R45-9 (PTNK) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *a Front view of the wire harness connector (to Fuel Tank Pressure Sensor) *b Front view of the wire harness connector (to Floor Wire) Reconnect the No. 3 frame wire to the fuel tank pressure sensor and floor wire side connectors. NG --> See step 8 OK: Go to next step
6. REPLACE VAPOR PRESSURE SENSOR ASSY Replace the fuel tank pressure sensor. Refer to «REMOVAL»(ref-393412-S19129505922011040700000) . NEXT --> See step 10
7. REPAIR OR REPLACE HARNESS OR CONNECTOR HINT: If the tailpipe has been removed, go to the next step before reinstalling it. NEXT --> See step 10
8. REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL TANK PRESSURE SENSOR - FLOOR WIRE) Repair or replace No. 3 frame wire. NEXT --> See step 10
9. REPLACE ECM Replace the ECM. Refer to «REMOVAL»(ref-393423-S41700152002011040700000) . NEXT --> See step 10
10. CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-393417-S07712997152011040700000) . Turn the power switch off and wait for 30 seconds. Turn the power switch on (IG) and turn the Techstream on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(ref-393299-S13482363572011040700000) . Start the engine and warm it up. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness. Input the DTC: P1451, P1452 or P1453. Check the DTC judgment result. HINT: If DTC judgment result is NORMAL, the repair has been successfully completed. NEXT --> END
11. GO TO EVAP SYSTEM. Refer to «EVAP System»(ref-393419-S37940908042011040700000)