Toyota Tundra (2015 year). Manual — part 1218
Last Modified: 9-16-2014
6.6 C
Doc ID: RM0000046N101EX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: 1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P144C,P144D; Open in Secondary Air Injection System
Heater Control Circuit; 2015 MY Tundra [08/2014 - ]
DTC
P144C
Open in Secondary Air Injection System Heater Control Circuit
DTC
P144D
Short in Secondary Air Injection System Heater Control Circuit
DESCRIPTION
The ECM operates the air pump heater (AI-HTR) relay which causes the air pump heater (AI-HTR) to operate.
DTC
NO.
DTC DETECTION CONDITION
TROUBLE AREA
P144C
Open or short in the air pump heater (AI-HTR) relay
circuit for 5 seconds (1 trip detection logic).
Open or short in air pump heater
(AI-HTR) relay circuit
Air pump heater (AI-HTR) relay
ECM
P144D
Open or short in the air pump heater (AI-HTR) relay
circuit for 5 seconds (1 trip detection logic).
Open or short in air pump heater
(AI-HTR) relay circuit
Air pump heater (AI-HTR) relay
ECM
MONITOR DESCRIPTION
These DTCs are designed to detect a malfunction in the air pump heater (AI-HTR) relay circuit. When the system
The battery voltage is not applied to terminal HAI1 while the air pump heater (AI-HTR) relay is off.
The battery voltage is applied to terminal HAI1 while the air pump heater (AI-HTR) relay is on.
MONITOR STRATEGY
Related DTCs
P144C: Air pump heater relay circuit range check (Low voltage)
P144D: Air pump heater relay circuit range check (High voltage)
Required Sensors/Components (Main)
Air pump heater relay (AI-HTR)
Required Sensors/Components (Related)
-
Duration
5 seconds
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P144C,P144D...
MIL operation
Immediate
TYPICAL ENABLING CONDITIONS
Case 1
Monitor runs whenever following DTCs not stored
None
Current air pump heater relay (AI-HTR)
ON
Last air pump heater (AI-HTR) relay
ON
Battery voltage
8 V or more
Ignition switch
ON
Starter
OFF
Case 2
Monitor runs whenever following DTCs not stored
None
Current air pump heater (AI-HTR) relay
OFF
Last air pump heater (AI-HTR) relay
OFF
Battery voltage
8 V or more
Ignition switch
ON
Starter
OFF
TYPICAL MALFUNCTION THRESHOLDS
P144C
Air pump heater (AI-HTR) relay output terminal voltage
Low
P144D
Air pump heater (AI-HTR) relay output terminal voltage
High
CONFIRMATION DRIVING PATTERN
Connect the Techstream to the DLC3.
1.
Turn the ignition switch to ON and turn the Techstream on.
2.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation).
3.
Turn the ignition switch off and wait for at least 30 seconds.
4.
Turn the ignition switch to ON and turn the Techstream on.
5.
Wait for 10 seconds.
6.
Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the Air Pump Heater.
7.
Activate the air pump heater for 10 seconds or more.
HINT:
The active test activates the air pump heater for up to 60 seconds.
To protect the air pump heater, do not perform this test more than 4 times in a row.
8.
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P144C,P144D...
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
9.
Read Pending DTCs.
HINT:
If a pending DTC is output, the system is malfunctioning.
If a pending DTC is not output, perform the following procedure.
10.
Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
11.
Input the DTC: P144C or P144D.
12.
Check the DTC judgment result.
TECHSTREAM
DISPLAY
DESCRIPTION
NORMAL
DTC judgment completed
System normal
ABNORMAL
DTC judgment completed
System abnormal
INCOMPLETE
DTC judgment not completed
Perform driving pattern after confirming DTC enabling conditions
N/A
Unable to perform DTC judgment
HINT:
If the judgment result shows NORMAL, the system is normal.
If the judgment result shows ABNORMAL, the system has a malfunction.
13.
If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip
and check for permanent DTCs
.
HINT:
If no permanent DTC is output, the system is normal.
If a permanent DTC is output, the system is malfunctioning.
14.
WIRING DIAGRAM
Refer to DTC P0412
.
INSPECTION PROCEDURE
NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
HINT:
Read freeze frame data using the Techstream. Freeze frame data records the engine condition when
malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was
moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other
data from the time the malfunction occurred.
PROCEDURE
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P144C,P144D...
OK
1.
INSPECT AIR PUMP HEATER (AI-HTR) RELAY
(a) Remove the air pump heater (AI-HTR) relay from the engine
room relay block.
(b) Measure the resistance according to the value(s) in the table
below.
Standard Resistance:
TESTER
CONNECTION
CONDITION
SPECIFIED
CONDITION
3 - 5
Battery voltage not applied
10 kΩ or higher
Battery voltage applied to
terminals 1 and 2
Below 1 Ω
NG
REPLACE AIR PUMP HEATER (AI-HTR) RELAY
2.
CHECK AIR PUMP HEATER (AI-HTR) RELAY (POWER SOURCE)
(a) Remove the air pump heater (AI-HTR) relay from the engine
room relay block.
(b) Measure the voltage according to the value(s) in the table below.
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P144C,P144D...
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