Failsafe Chart

HINT:

If any of the following codes are recorded, the ECM enters the fail-safe mode.

Fig. 31: MIL Flash Pattern FAIL-SAFE CHART

DTC

Item

Fail-safe Operation

Fail-safe Deactivation Conditions

P0031, P0032, P0051 and P0052

Air Fuel Ratio (A/F) Sensor Heater

ECM turn off A/F Sensor heater.

Ignition switch OFF

2007 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Sequoia

P0037, P0038, P0057 and P0058

Heated Oxygen (HO2) Sensor Heater

ECM turn off HO2 Sensor heater.

Ignition switch OFF

P0100, P0102 and P0103

Mass Air Flow (MAF) Meter

The ignition timing is calculated from engine RPM and throttle position.

"Pass" condition detected

P0110, P0112 and P0113

Intake Air Temperature (IAT) Sensor

The ECM detects that IAT is 20°C (68°F).

"Pass" condition detected

P0115, P0117 and P0118

Engine Coolant Temperature (ECT) Sensor

The ECM detects that ECT is 80°C (176°F).

"Pass" condition detected

P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2102, P2103, P2111, P2112, P2118, P2119 and P2135

Electronic Throttle Control System (ETCS)

The ECM cuts off the throttle actuator current and the throttle valve returns to 7° throttle position by the return spring. The ECM then adjusts the engine output by controlling the fuel injection (intermittent fuel-cut) and ignition timing in accordance with the accelerator pedal opening angle to continue at a minimal speed*.

"Pass" condition is detected and then the ignition switch is turned OFF.

P0327, P0328, P0332 and P0333

Knock Sensor

The ECM sets the ignition timing to the maximum retard position.

Ignition switch OFF

P0351 to P0358

Igniter

Fuel-cut

"Pass" condition detected.

P2120, P2121, P2122, P2123, P2125, P2127, P2128 and P2138

Accelerator Pedal Position (APP) Sensor

The APP sensor has 2 sensor elements (main and sub). If either of the elements malfunctions, the ECM controls the engine with other elements. If both of the elements malfunction, ECM regards accelerator pedal as being released. As a result, throttle valve is closed and engine idles.

"Pass" condition is detected and the ignition switch is turned OFF

P2440 and P1441 and/or P1444

Air Injection (Al) system

Restrict the throttle opening angle: Ga is 30 g/sec. or less

"Pass" condition detected

P1441 and P1444

Air Injection (Al) system

Restrict the throttle opening angle: Ga is 50 g/sec. or less

"Pass" condition detected

P1441, P1444

Air Injection (Al) system

Restrict the throttle opening angle: Ga is 100 g/sec. or less

"Pass" condition detected

P2430, P2431, P2432, P2433

Pressure Sensor

Restrict the throttle opening angle: Ga is 50 g/sec. or less

"Pass" condition detected

HINT:

*: 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.

DATA LIST / ACTIVE TEST

DATA LIST / ACTIVE TEST

1. DATA LIST

2007 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Sequoia

Using the intelligent tester's DATA LIST allows switch, sensor, actuator and other item values to be read without removing any parts. Reading the DATA LIST early in troubleshooting is one way to save time.

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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