Toyota RAV4 manuals

Toyota Sienna Service Manual: ECM / PCM Internal Engine Off Timer Performance

DTC SUMMARY

ECM / PCM Internal Engine Off Timer Performance

DESCRIPTION

To ensure the accuracy of the EVAP (Evaporative Emission) monitor values, the soak timer, which is built into the ECM, measures 5 hours (+/- 15 minutes) from when the ignition switch is turned off, before the monitor is run. This allows the fuel to cool down, which stabilizes the Fuel Tank Pressure (FTP). When 5 hours have elapsed, the ECM turns on.

ECM / PCM Internal Engine Off Timer Performance

MONITOR DESCRIPTION

5 hours after the ignition switch is turned off, the soak timer activates the ECM to begin the EVAP system monitor. While the engine is running, the ECM monitors the synchronization of the soak timer and the CPU clock. If these two are not synchronized, the ECM interprets this as a malfunction, illuminates the MIL and sets the DTC (2 trip detection logic).

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS

INSPECTION PROCEDURE

HINT:

1 REPLACE ECM

(a) Replace the ECM (See page ES-498).

2 CHECK WHETHER DTC OUTPUT RECURS

(a) Connect the intelligent tester to the DLC3.

(b) Turn the ignition switch to the ON position.

(c) Clear the DTCs (See page ES-39).

(d) Start the engine and wait for 10 minutes or more.

(e) Select the following menu items on the tester: DIAGNOSIS / ENHANCED OBD II / DTC INFO / PENDING CODES.

(f) If no pending DTC is displayed, the repair has been successfully completed.

OK: No DTC output.

END

Evaporative Emission System Switching Valve Control Circuit High
DTC SUMMARY DESCRIPTION The circuit description can be found in the EVAP (Evaporative Emission) System (See page ES-404). INSPECTION PROCEDURE Refer to the EVAP System (See page ES-404). ...

A/F Sensor Circuit Slow Response
HINT: DTC P2A00 indicates malfunctions related to the bank 1 A/F sensor. DTC P2A03 indicates malfunctions related to the bank 2 A/F sensor. Bank 1 refers to the bank that includes cylinder ...

Other materials:

Coolant
Replacement 1. REMOVE NO. 1 ENGINE UNDER COVER (See page EM-26) 2. REMOVE V-BANK COVER SUB-ASSEMBLY (See page EM-28) 3. DRAIN ENGINE COOLANT (a) Loosen the radiator drain cock plug. HINT: Collect the coolant in a container and dispose of it according to the regulations in your area. (b ...

Differential system
PRECAUTION NOTICE: When disconnecting the negative (-) battery terminal, initialize the following systems after the terminal is reconnected. 1. Before disassembly, clean the outside of the rear differential assembly and remove any sand or mud to prevent it from entering the inside of the as ...

Engine
GENERAL MAINTENANCE HINT: Inspect these items when the engine is cold. 1. INSPECT DRIVE BELT HINT: (See page EM-6) 2. REPLACE SPARK PLUGS HINT: (See page IG-8) 3. INSPECT AIR FILTER (a) Remove the air filter. (b) Visually check that the air filter is not excessively damaged or oily ...

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