Toyota Sequoia (2005). Manual — part 118
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–
DIAGNOSTICS
ENGINE
DI–267
461
Pressure sensor chattering, low/high voltage:
Battery voltage
8 V
–
Ignition switch
ON
Starter
OFF
TYPICAL MALFUNCTION THRESHOLDS
Detection Criteria
Threshold
Pressure sensor noise:
Frequency that FTP change is 0.3 kPa or more
10 times or more for 10 sec.
Pressure sensor stuck:
FTP change for 10 sec. during EVAP monitor (0.02 inch
reference pressure)
Less than 4.9 mmHg (0.65 kPa)
Pressure sensor chattering:
Pressure sensor voltage
Less than 0.45 V, or more than 4.9 V
Pressure sensor low voltage:
Pressure sensor voltage
Less than 0.45 V
Pressure sensor high voltage:
Pressure sensor voltage
More than 4.9 V
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DI–268
–
DIAGNOSTICS
ENGINE
462
INSPECTION PROCEDURE
NOTICE:
When a vehicle is brought into the workshop, leave it as it is. Do not change the vehicle condi-
tion. For example, do not tighten the fuel tank cap.
Do not disassemble the pump module.
A hand–held tester is required to conduct the following diagnostic troubleshooting procedure.
1
Confirm DTC and EVAP pressure.
PREPARATION:
(a)
Connect a hand–held tester to the DLC3.
(b)
Turn the ignition switch to ON (do not start the engine).
(c)
Turn the tester ON.
CHECK:
(a)
Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
(b)
Read DTCs.
(c)
Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / VAPOR
PRESS.
(d)
Read the EVAP (Evaporative Emission) pressure displayed on the tester.
RESULT:
Display (DTC Output)
Test Results
Suspected Trouble Areas
Proceed To
P0451
Pressure sensor
C
P0452
Less than 45 kpa (430 mmHg)
Wire harness/connector (ECM – pressure
sensor)
Pressure sensor
Short in ECM circuit
A
P0453
More than 120 kPa (900 mmHg)
Wire harness/connector (ECM – pressure
sensor)
Pressure sensor
Open in ECM circuit
B
B
Go to step 4.
C
Go to EVAP inspection procedure
(See page
).
A
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B17417
E4
PPMP
–
DIAGNOSTICS
ENGINE
DI–269
463
2
Measure resistance between terminal PPMP of ECM and body ground.
PREPARATION:
(a)
Turn the ignition switch to OFF.
(b)
Disconnect the E4 ECM connector.
CHECK:
Measure the resistance between PPMP terminal of the ECM
connector and the body ground.
RESULT:
Test Results
Suspected Trouble Areas
Proceed To
10
Ω
or less
Wire harness/connector (ECM – pressure sensor)
Short in pressure sensor circuit
A
10 k
Ω
or more
Wire harness/connector (ECM – pressure sensor)
Short in ECM circuit
B
B
Go to step 7.
A
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B17417
E4
PPMP
A23446
L5
DI–270
–
DIAGNOSTICS
ENGINE
464
3
Measure resistance between terminal PPMP of ECM and body ground.
PREPARATION:
(a)
Disconnect the L5 canister connector.
(b)
Disconnect the E4 ECM connector.
CHECK:
Check the resistance between PPMP terminal of the ECM con-
nector and the body ground.
Result:
Test Results
Suspected Trouble Areas
Proceed To
10 k
Ω
or more
Short in pressure sensor circuit
A
10
Ω
or less
Short in wire harness/connector (ECM – pressure sensor)
B
A
Go to step 5.
B
Go to step 6.
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