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DI-735
DIAGNOSTICS - ENGINE (2UZ-FE)
DIDRW-01
DTC P1440 Secondary Air Injection System Control
Valve Circuit Bank 1
DTC P1443 Secondary Air Injection System Control
Valve Circuit Bank 2
CIRCUIT DESCRIPTION
Refer to DTC P0412 on page DI-656.
DTC No. DTC Detection Condition Trouble Area
S Open or short in VSV for air injection control circuit (Bank 1)
AIV1 terminal voltage becomes less than half of the +B voltage
S VSV power source
P1440 while the VSV for air injection control is not operating.
S VSV for air injection control (Bank 1)
(1 trip detection logic)
S ECM
S Open or short in VSV for air injection control circuit (Bank 2)
AIV2 terminal voltage becomes less than half of the +B voltage
S VSV power source
P1443 while the VSV for air injection control is not operating.
S VSV for air injection control (Bank 2)
(1 trip detection logic)
S ECM
MONITOR DESCRIPTION
The ECM detects an open or short in the circuit of the VSV for air injection control according to the AIV1
(AIV2) terminal voltage, stores the DTC, and then illuminates the MIL. When the AIV1 (AIV2) terminal voltage
is less than half of the +B voltage while the VSV for air injection control is not operating, the ECM determines
it as a malfunction.
MONITOR STRATEGY
Secondary air injection system control valve cir-
P1440
cuit (Bank 1) range check
Related DTCs
R l t d DTC
Secondary air injection system control valve cir-
P1443
cuit (Bank 2) range check
Required sensors/components VSV for air injection control
Frequency of operation Continuous
Duration 0.5 sec.
MIL operation Immediate
Sequence of operation None
DI-736
DIAGNOSTICS - ENGINE (2UZ-FE)
TYPICAL ENABLING CONDITIONS
Specification
Item
It
Minimum Maximum
The monitor will run whenever this DTC is
See page DI-437
not present
P1440:
Engine Running
Air switching valve No. 2 (Bank 1) Not operating
P1443:
Engine Running
Air switching valve No. 2 (Bank 2) Not operating
TYPICAL MALFUNCTION THRESHOLDS
Detection Criteria Threshold
P1440:
Air switching valve No. 2 (Bank 1) output terminal level Low
P1443:
Air switching valve No. 2 (Bank 2) output terminal level Low
WIRING DIAGRAM
Refer to DTC P0412 on page DI-656.
INSPECTION PROCEDURE
1 Check VSV for air injection control power source.
Wire Harness Side: PREPARATION:
(a) Disconnect the VSV for air injection control connector.
V14 (b) Turn the ignition switch ON.
V15 CHECK:
Measure the voltage between the terminal 1of VSV connector
and body ground.
OK:
VSV for Air Injection Standard: 9 V or more
Control Connector B17440
NG Check and replace harness and connector.
OK
DI-737
DIAGNOSTICS - ENGINE (2UZ-FE)
2 Check for open and short circuit in harness and connector between ECM and
VSV for air injection control
PREPARATION:
E7 (a) Disconnect the E7 ECM connector.
(b) Disconnect the VSV for air injection control connector.
CHECK:
Measure the resistance between the VSV connector and ECM.
OK:
Standard:
Tester connection Specified condition
AIV1 AIV2
B17412
E7-27 (AIV1) - V14-2 Below 1
E7-26 (AIV2) - V15-2 Below 1
Wire Harness Side:
CHECK:
Measure the resistance between the VSV connector and body
V14
ground.
V15 OK:
Standard:
Tester connection Specified condition
VSV for Air Injection E7-27 (AIV1) or V14-2 and Body
10 K or higher
Control Connector ground
B17440
E7-26 (AIV1) or V15-2 and Body
10 K or higher
ground
NG Repair or replace harness or connector.
OK
DI-738
DIAGNOSTICS - ENGINE (2UZ-FE)
3 Check resistance of VSV for air injection control.
PREPARATION:
(a) Disconnect the connector from the VSV.
(b) Disconnect the 2 vacuum hoses from the VSV.
CHECK:
Measure the resistance between the VSV terminals.
OK:
Standard:
Tester Connection Specified Condition
B17515
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