Toyota Tundra. Manual — part 1406

properly. If outputs from the CPUs are different and deviate from the standards, the ECM will illuminate the
MIL and set a DTC immediately.

DTC DETECTION CONDITION AND TROUBLE AREA

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS

INSPECTION PROCEDURE

1. CHECK DTC

a. Clear DTC. (See DTC CHECK/CLEAR ).

b. Turn the ignition switch off.

c. Disconnect the cable from the negative battery terminal and wait for 1 minute.

d. Connect the cable to the negative battery terminal.

e. Turn the ignition switch to ON.

f. Check DTC.

OK: P1607 is not present.

DTC Code

DTC Detection Condition

Trouble Area

P1607

ECM CPUs malfunction

ECM

Related DTC

P1607: Internal control module range check

Required sensors/Components (main)

ECM

Required sensors/Components (sub)

Cruise control

Frequency of Operation

Continuous

Duration

0.3 seconds

MIL Operation

Immediate

Sequence of Operation

None

Monitor runs whenever the following DTCs are not present

None

Cruise control

Forbiddance

When either condition below is met:

-



Cruise control

Operating



Low speed control

Operating

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

NG : REPLACE ECM (See REMOVAL )

OK : CHECK FOR INTERMITTENT PROBLEMS (See CHECK FOR INTERMITTENT
PROBLEMS )

DTC P1613 SECONDARY AIR INJECTION DRIVER MALFUNCTION; DTC P1614 SECONDARY
AIR INJECTION SYSTEM DRIVER BANK 2

DESCRIPTION

Refer to DTC P0412 .

DTC DETECTION CONDITION AND TROUBLE AREA

DTC

Code

DTC Detection Condition

Trouble Area

P1613
P1614

Either of following conditions (1) or (2) met:

1. All of following conditions met (1 trip

detection logic):



Either of air pump or air switching
valve not operating



Diagnostic signal from Air Injection
Control Driver (AID) 80%



Battery voltage 8 V or higher

2. Both of following conditions met (1 trip

detection logic):



Battery voltage 8 V or higher



Diagnostic signal from AID abnormal
(duty signal other than 0,20, 40, 80
and 100%)



AID



Open in AID ground circuit

P1613
P1614

All of following conditions met (1 trip detection
logic):

a. Air injection system operating (Air

Switching Valve [ASV] ON and air pump
ON)

b. Diagnostic signal from Air Injection

Control Driver (AID) 0%

c. Battery voltage 8 V or higher



Short in diagnostic information signal
circuit (AID - ECM)



Open or short in air pump and air
switching valve command signal
circuit (AID - ECM)



Open in AID ground circuit



AID



ECM

P1613
P1614

Both of following conditions met (1 trip detection
logic):

a. Battery voltage 8 V or higher

b. Diagnostic signal from Air Injection



Open or short in AID power source
circuit



Open in diagnostic information signal
circuit (AID - ECM)



AID

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

MONITOR DESCRIPTION

For a short time after cold engine starts, the ECM transmits command signals to the Air Injection Control
Driver (AID) to drive the air pump and the Air Switching Valve (ASV). The AID detects open and short circuits
according to the voltages at the AID terminals to the air pump and ASV, and the circuit voltage of the AID
power source, and transmits diagnostic information as a signal to the ECM.

If the Secondary Air Injection (AIR) system circuit or the AID itself malfunctions, the AID sends a malfunction
signal (duty signal) as diagnostic information to the ECM (when the system is normal, a system normal signal is
sent). The ECM sets the DTC based on the diagnostic information from the AID.

EXAMPLE:

1. The duty ratio of the diagnostic signal from the AID is 0 or 100% (remains at 0 V or the same as battery

voltage).

2. The duty ratio of the diagnostic signal from the AID shows an impossible ratio (other than 0, 20, 40, 80

and 100%).

3. The AID outputs the normal signal (normal duty signal: 80%) while the system is not operating.

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

Case 1 and 4:

TYPICAL ENABLING CONDITIONS - CASE 1 AND 4

Control Driver (AID) 100%



ECM

Related DTCs

P1613: Secondary air injection system air injection control driver
circuit range check
P1614: Secondary air injection system air injection control driver
circuit range check

Required Sensors/Components
(Main)

Air injection control driver

Required Sensors/Components
(Related)

Air switching valve

Frequency of Operation

Once per drive cycle

Duration

3 seconds

MIL Operation

Immediate

Sequence of Operation

None

Monitor runs whenever following DTCs not present

None

Battery voltage

8 V or higher

Ignition switch

ON

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

Case 2:

TYPICAL ENABLING CONDITIONS - CASE 2

Case 3:

TYPICAL ENABLING CONDITIONS - CASE 3

TYPICAL MALFUNCTION THRESHOLDS

Case 1:

TYPICAL MALFUNCTION THRESHOLDS - CASE 1

Case 2:

TYPICAL MALFUNCTION THRESHOLDS - CASE 2

Case 3:

TYPICAL MALFUNCTION THRESHOLDS - CASE 3

Starter

OFF

Monitor runs whenever following DTCs not present

None

Either a or b met:

-

a. Air pump

Not operating

b. Air switching valve

Not operating

Battery voltage

8 V or higher

Ignition switch

ON

Starter

OFF

Monitor runs whenever following DTCs not present

None

Following conditions (a) and (b) met

-

a. Air pump

Operating

b. Air switching valve

Operating

Battery voltage

8 V or higher

Ignition switch

ON

Starter

OFF

One of following conditions met:

A, B, C or D

A. Diagnostic signal duty ratio from air injection control driver

1% or more, and 10% or less

B. Diagnostic signal duty ratio from air injection control driver

30%

C. Diagnostic signal duty ratio from air injection control driver

49%

D. Diagnostic signal duty ratio from air injection control driver

91% or more, and 99% or less

Diagnostic signal duty ratio from air injection control driver

70% or more, and 90% or less

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra