Toyota Sienna Service Manual: Check mode procedure

HINT:

Intelligent tester only: Compared to normal mode, check mode is more sensitive to malfunctions. Therefore, check mode can detect the malfunctions that cannot be detected by normal mode.

1. CHECK MODE PROCEDURE (Using an intelligent tester)

(a) Check and ensure the following conditions:

(1) Battery voltage 12 V or more

(2) Throttle valve fully closed

(3) The shift lever in the P or N position

(4) A/C switched OFF

(b) Turn the ignition switch off.

(c) Connect an intelligent tester to the DLC3.

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

(e) Turn the tester ON.

(f) Select the following menu items: DIAGNOSIS / ENHANCED OBD II / CHECK MODE.

(g) Switch the ECM from normal mode to check mode.

(h) Make sure that the MIL flashes as shown in the illustration.

(i) Start the engine.

(j) Make sure that the MIL goes off.

(k) Simulate the conditions of the malfunction described by the customer.

(l) Check for DTCs and freeze frame data using the tester.

FAIL-SAFE CHART

If any of the following DTCs are set, the ECM enters fail-safe mode to allow the vehicle to be driven temporarily.

HINT:

• *1: The vehicle can be driven slowly when the accelerator pedal is depressed firmly and slowly. If the accelerator pedal is depressed quickly, the vehicle may speed up and slow down erratically.
• *2: Misfire related fail-safe operations occur when catalyst overheat malfunctions occur.