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DTC P24BB: Canister Pressure Sensor Circuit High Input
 
 
 
 
CIRCUIT OPERATION
  • The ECM terminal EVSS supplies a 5 volts reference signal to the canister pressure sensor. The canister pressure sensor is grounded through the ECM terminal EVSE.
  • The canister pressure sensor returns a voltage signal to the ECM terminal EVS that is proportional to the pressure in the fuel tank.
 
 
TECHNICAL DESCRIPTION
  • To determine whether the canister pressure sensor is defective, the ECM monitors the canister pressure sensor output voltage.
  • The ECM judges if the canister pressure sensor output voltage is normal.
 
 
DESCRIPTIONS OF MONITOR METHODS
  • canister pressure sensor output voltage is out of specified range.
 
 
MONITOR EXECUTION
  • Continuous.
 
 
MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR)
Other Monitor (There is no temporary DTC set in memory for the item monitored below)
  • Not applicable
Sensor (The sensors below are determined to be normal)
  • Not applicable
 
 
DTC SET CONDITIONS
Logic Flow Chart (Monitor Sequence)
 
 
Check Conditions
  • More than 2 seconds have passed since the power supply mode of electric motor switch was ON.
Judgment Criterion
  • Canister pressure sensor output voltage is higher than 4.9 volts for 2 seconds.
 
 
FAIL-SAFE AND BACKUP FUNCTION
  • None
 
 
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .
 
 
TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THIS CODE TO BE SET ARE:)
  • canister pressure sensor failed.
  • Open or shorted canister pressure sensor circuit, harness damage or connector damage.
  • ECM failed.
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), check data list item 212: canister pressure sensor.
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn off the power supply mode of the electric motor switch before connecting or disconnecting scan tool (M.U.T.-IIISE).
(1) Connect scan tool (M.U.T.-IIISE). Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-IIISE) .
(2) Turn on the power supply mode of the electric motor switch.
(3) Remove the fuel cap.
(4) Set scan tool (M.U.T.-IIISE) to the data reading mode for item 212, canister pressure sensor.
  • When altitude is 0 m (0 foot), 101 kPa (29.8 in.Hg).
  • When altitude is 600 m (1,969 feet), 95 kPa (28.1 in.Hg).
  • When altitude is 1,200 m (3,937 feet), 88 kPa (26.0 in.Hg).
  • When altitude is 1,800 m (5,906 feet), 81 kPa (23.9 in.Hg).
(5) Turn off the power supply mode of the electric motor switch.
Is the sensor operating properly?
It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting / Inspection Service Points - How to Cope with Intermittent Malfunctions .
Go to Step 2.
 
STEP 2. Check the continuity at evaporative leak check module harness side connector.
(1) Disconnect the evaporative leak check module connector and measure at the harness side.
(2) Measure the continuity between terminal EVSE and ground
  • Continuity (2 ohms or less)
Does continuity exist?
Go to Step 5.
Go to Step 3.
 
STEP 3. Check of open circuit and harness damage in EVSE line between evaporative leak check module connector and ECM connector.
Is the harness wire in good condition?
Go to Step 4.
Repair the connector(s) or wiring harness. Then go to Step 7.
 
STEP 4. Using scan tool (M.U.T.-IIISE), check data list item 212: canister pressure sensor.
(1) Turn on the power supply mode of the electric motor switch.
(2) Remove the fuel cap.
(3) Set scan tool (M.U.T.-IIISE) to the data reading mode for item 212, canister pressure sensor.
  • When altitude is 0 m (0 foot), 101 kPa (29.8 in.Hg).
  • When altitude is 600 m (1,969 feet), 95 kPa (28.1 in.Hg).
  • When altitude is 1,200 m (3,937 feet), 88 kPa (26.0 in.Hg).
  • When altitude is 1,800 m (5,906 feet), 81 kPa (23.9 in.Hg).
(4) Turn off the power supply mode of the electric motor switch.
Is the sensor operating properly?
It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting / Inspection Service Points - How to Cope with Intermittent Malfunctions .
Replace the ECM (Refer to Removal and Installation ). Then go to Step 7.
 
STEP 5. Check of short to power supply, open circuit and harness damage in EVS line between evaporative leak check module connector and ECM connector.
Is the harness wire in good condition?
Go to Step 6.
Repair the connector(s) or wiring harness. Then go to Step 7.
 
STEP 6. Replace the canister pressure sensor (integrated in evaporative emission canister).
(1) Replace the canister pressure sensor (integrated in evaporative emission canister).
(2) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .
(3) Check the diagnostic trouble code (DTC).
Is DTC P24BB set?
Replace the ECM (Refer to Removal and Installation ). Then go to Step 7.
The inspection is complete.
 
STEP 7. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .
(2) Check the diagnostic trouble code (DTC).
Is DTC P24BB set?
Retry the troubleshooting.
The inspection is complete.