Toyota Tundra (2015 year). Manual — part 1219
OK
Standard Voltage:
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
1 (Air pump heater (AI-HTR) relay) - Body ground
Always
11 to 14 V
Text in Illustration
*1
Engine Room Relay Block
*2
Air Pump Heater (AI-HTR) Relay
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
3.
CHECK HARNESS AND CONNECTOR (ECM - AIR PUMP HEATER (AI-HTR) RELAY)
(a) Remove the air pump heater (AI-HTR) relay from the engine room relay block.
(b) Disconnect the D74 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
2 (Air pump heater (AI-HTR) relay) - D74-60 (HAI1)
Always
Below 1 Ω
2 (Air pump heater (AI-HTR) relay) or D74-60 (HAI1) - Body ground
Always
10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE ECM
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P144C,P144D...
Last Modified: 9-16-2014
6.6 C
Doc ID: RM0000021140P7X
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: 1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1603,P1605; Engine Stall History; 2015 MY Tundra
[08/2014 - ]
DTC
P1603
Engine Stall History
DTC
P1605
Rough Idling
DESCRIPTION
P1603
After starting the engine, this DTC is stored when the engine stops without the ignition switch being operated.
Using the Techstream, the conditions present when the DTC was stored can be confirmed by referring to the
freeze frame data. Freeze frame data records engine conditions when a malfunction occurs. This information can
be useful when troubleshooting.
DTC
NO.
DTC DETECTION CONDITION
TROUBLE AREA
P1603
After monitoring for startability problems (P1604) finishes and
5 seconds or more elapse after starting the engine, with the
engine running, the engine stops (the engine speed drops to
200 rpm or less) without the ignition switch being operated for
0.5 seconds or more (1 trip detection logic).
Air leak in intake system
Purge VSV
Brake booster
Mass air flow meter
Engine coolant temperature
sensor
Water inlet with thermostat
sub-assembly
Power supply circuit (purge
VSV, air fuel ratio sensor,
fuel injector assembly,
ignition coil assembly)
Fuel pump
Fuel pump control circuit
Fuel line
PCV valve and hose
Camshaft timing oil control
valve
Knock sensor
Ignition system
Air conditioning system
Power steering system
Electrical load signal system
Charging system
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1603,P1605;...
DTC
NO.
DTC DETECTION CONDITION
TROUBLE AREA
A/T system
Park/neutral position switch
assembly
ECM
Wire harness or connector
EGR valve assembly
Engine immobiliser system
P1605
This DTC is stored if the engine speed drops below the set speed without the ignition switch being operated.
Using the Techstream, the conditions present when the DTC was stored can be confirmed by referring to the
freeze frame data. Freeze frame data records engine conditions when a malfunction occurs. This information can
be useful when troubleshooting.
DTC
NO.
DTC DETECTION CONDITION
TROUBLE AREA
P1605
After 5 seconds or more elapse after starting the engine,
with the engine running, the engine speed drops to 400
rpm or less without the ignition switch being operated for
0.5 seconds or more (1 trip detection logic).
Air leak in intake system
Purge VSV
Brake booster
Mass air flow meter
Engine coolant temperature
sensor
Water inlet with thermostat
sub-assembly
Power supply circuit (purge VSV,
air fuel ratio sensor, fuel injector
assembly, ignition coil assembly)
Fuel pump
Fuel pump control circuit
Fuel line
PCV valve and hose
Camshaft timing oil control valve
Knock sensor
Ignition system
Air conditioning system
Power steering system
Electrical load signal system
Charging system
A/T system
Park/neutral position switch
assembly
ECM
Wire harness or connector
EGR valve assembly
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1603,P1605;...
DTC
NO.
DTC DETECTION CONDITION
TROUBLE AREA
Engine immobiliser system
INSPECTION PROCEDURE
HINT:
In contrast to normal malfunction diagnosis for components, circuits and systems, DTCs P1603 and P1605
are used to determine the malfunctioning area from the problem symptoms and freeze frame data when
the user mentions problems such as engine stall.
SUSPECTED AREA
Engine vibration occurs and engine stops
Air-fuel ratio abnormal
Engine stops with no engine vibration
Ignition system, injection stoppage, high load from
external parts
Engine can be started with accelerator pedal
depressed
Insufficient air volume
Rough idling after engine started
Air-fuel ratio abnormal, abnormal combustion
.
Using freeze frame data, narrow down the parts to be inspected according to the vehicle conditions at the
time when the malfunction occurred.
P1603:
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1603,P1605;...
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