Inspection Procedure

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 pump module.
An intelligent tester is required to conduct the following diagnostic troubleshooting procedure.

CONFIRM DTC AND EVAP PRESSURE

Connect an intelligent tester to the DLC3.
Turn the ignition switch to ON (do not start the engine).
Turn the tester ON.
Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
Read DTCs.
Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / VAPOR PRESS.

Read the EVAP (Evaporative Emission) pressure displayed on the tester.

Result

DTC OUTPUT 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 Short in ECM circuit	B

B: Go to step 5

C: GO TO EVAP SYSTEM

A: Go to next step

CHECK HARNESS AND CONNECTOR (PUMP MODULE - ECM)

Turn the ignition switch to OFF.
Disconnect the E6 ECM connector.

Measure the resistance between PPMP terminal of the ECM connector and the body ground.

Fig 1: Disconnecting E6 ECM Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Result

RESULT REFERENCE (1 OF 2)

Test Results	Suspected Trouble Areas	Proceed to
10 or less	Wire harness/connector (ECM - pressure sensor) Short in pressure sensor circuit	A
10 k or more	Wire harness/connector (ECM - pressure sensor) Short in ECM circuit	B

Reconnect the ECM connector.

B: Go to step 8

A: Go to next step

CHECK HARNESS AND CONNECTOR (PUMP MODULE - ECM)

Disconnect the L4 canister connector.
Disconnect the E6 ECM connector.

Measure the resistance between PPMP terminal of the ECM connector and the body ground.

Fig 2: Disconnecting L4 Canister And E6 ECM Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Result

RESULT REFERENCE (2 OF 2)

Test Results	Suspected Trouble Areas	Proceed to
10 k or more	Short in pressure sensor circuit	A
10 or less	Short in wire harness/connector (ECM - pressure sensor)	B

Reconnect the canister connector.
Reconnect the ECM connector.

B: Go to step 7

A: Go to next step

REPLACE CHARCOAL CANISTER ASSEMBLY
1. Replace the charcoal canister assembly.
2. Connect the intelligent tester to the DLC3.
3. Turn the ignition switch to ON and turn the tester ON.
4. Wait for at least 60 seconds.
5. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / PENDING CODES.
  HINT:
  
  If no pending DTC is displayed on the tester, the repair has been successfully completed.
NEXT : COMPLETED

CHECK HARNESS AND CONNECTOR (PUMP MODULE - ECM)

Disconnect the L4 canister connector.
Turn the ignition switch to ON.

Measure the voltage and resistance of the L4 connector.

Standard voltage and resistance

VOLTAGE AND RESISTANCE SPECIFIED CONDITION

Tester Connections	Specified Condition
L4-4 - Body ground	Between 4.5 V and 5.5 V
L4-3 - Body ground	Between 4.5 V and 5.5 V
L4-2 - Body ground	100 or lees

Fig 3: Locating L4 Canister Connector

Result

RESULT REFERENCE

Test Results	Suspected Trouble Areas	Proceed to
Voltage and resistance within standard ranges	Open in pressure sensor circuit	A
Voltage and resistance outside standard ranges	Open in wire harness/connector (ECM - pressure sensor)	B

Reconnect the canister connector.

B: Go to step 7

A: Go to next step

REPLACE CHARCOAL CANISTER ASSEMBLY
1. Replace the charcoal canister assembly.
2. Connect the intelligent tester to the DLC3.
3. Turn the ignition switch to ON and turn the tester ON.
4. Wait for at least 60 seconds.
5. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / PENDING CODES.
  HINT:
  
  If no pending DTC is displayed on the tester, the repair has been successfully completed.
NEXT: COMPLETED
REPAIR OR REPLACE WIRE HARNESS AND CONNECTORS
1. Repair or replace the wire harness and the connectors.
2. Connect the intelligent tester to the DLC3.
3. Turn the ignition switch to ON and turn the tester ON.
4. Wait for at least 60 seconds.
5. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / PENDING CODES.
  HINT:
  
  If no pending DTC is displayed on the tester, the repair has been successfully completed.
NEXT : COMPLETED
REPLACE ECM
1. Replace the ECM (See REMOVAL ).
2. Connect the intelligent tester to the DLC3.
3. Turn the ignition switch to ON and turn the tester ON.
4. Wait for at least 60 seconds.
5. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / PENDING CODES.
  HINT:
  
  If no pending DTC is displayed on the tester, the repair has been successfully completed.
NEXT : COMPLETED

HINT:

DTC P2610 is set if an internal ECM problem is detected. Diagnostic procedures are not required. ECM replacement is required.
Read freeze frame data using an intelligent tester or OBD II scan tool. 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.

REPLACE ECM
1. Replace the ECM (See REMOVAL ).
NEXT
CHECK WHETHER DTC OUTPUT RECURS
1. Connect an intelligent tester to the DLC3.
2. Turn the ignition switch to ON.
3. Clear DTCs (See DTC CHECK / CLEAR ).
4. Start the engine and wait for 10 minutes or more.
5. On the tester, select the following menu items:
  DIAGNOSIS / ENHANCED OBD II / DTC INFO / PENDING CODES.
6. If no pending DTC is displayed, the repair has been successfully completed.
NEXT : END