Toyota Tundra. Manual — part 1228

2. INSPECT STOP LIGHT SWITCH ASSEMBLY (See INSPECTION PROCEDURE )

NG : REPLACE STOP LIGHT SWITCH ASSEMBLY . (See STOP LIGHT SWITCH ).

OK : Go to next step.

3. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - ECM)

a. Disconnect the A4 stop light switch connector.

b. Disconnect the A24 ECM connector.

c. Measure the resistance according to the value(s) in the table below.

Standard resistance (Check for open)

TESTER CONNECTION SPECIFIED CONDITION

Standard resistance (Check for short)

TESTER CONNECTION SPECIFIED CONDITION

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

Tester Connection Condition Specified Condition

A24-36 (STP) - A4-1

Always

Below 1 ohms

A24-35 (ST1-) - A4-4 Always

Below 1 ohms

Tester Connection

Condition Specified Condition

A24-36 (STP) or A4-1 - Body ground

Always

10 kohms or higher

A24-35 (ST1-) or A4-4 - Body ground Always

10 kohms or higher

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

Fig. 183: Identifying A4 Stop Light Switch Connector & A24 ECM Connector Terminals

OK : REPLACE ECM (See REMOVAL )

DTC P1607 CRUISE CONTROL INPUT PROCESSOR

DESCRIPTION

The ECM continuously monitors its main and sub CPUs. This self-check ensures that the ECM is functioning
properly. If outputs from the CPUs are different and deviate from the standards, the ECM will illuminate the
MIL and set a DTC immediately.

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

Related DTC

P1607: Internal control module range check

Required sensors/Components (Main)

ECM

Required sensors/Components (Related)

Cruise control

Frequency of Operation

Continuous

Duration

0.3 seconds

MIL Operation

Immediate

Sequence of Operation

None

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

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 ON.

f. Check DTC.

OK: P1607 is not present.

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 TROUBLE DETECTION CONDITION CHART

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

DTC

No.

DTC Detection Condition

Trouble Area

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

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-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

P1613
P1614



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



Battery voltage 8 V or more

2. Both of following conditions met (1 trip

detection logic):



Battery voltage 8 V or more



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



Air injection control driver (AID)



Open in AID ground circuit

P1613

w

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 more



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 more

b. Diagnostic signal from Air Injection Control

Driver (AID) 100%



Open or short in AID power source
circuit



Open in diagnostic information signal
circuit (AID - ECM)



AID



ECM

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra