1998 TOYOTA LAND CRUISER Factory Repair Manual

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Page 1121 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual A19549
THA
E2ECM
2
1
Mass Air
Flow Meter Mass Air
Flow Meter
12
M1
THA E2
M1
DI-72
- DIAGNOSTICSENGINE
265 Author: Date:
2004 LAND CRUISER (RM1071U)
2 Check for open in harness or ECM.
PREPARATION

Page 1122 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual A19548THA
E2
THA
E2ECM Mass Air Flow Meter
M1
E5
ECM Connector
A19550
THA
E2ECM Mass Air Flow
Meter
M1
- DIAGNOSTICSENGINE
DI-73
266 Author: Date:
2004 LAND CRUISER (RM1071U)
3 Check for open in h

Page 1123 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual A19551A19635
ECM Mass Air Flow Meter
THA
E2 M1
E5
DI-74
- DIAGNOSTICSENGINE
267 Author: Date:
2004 LAND CRUISER (RM1071U)
5 Check for short in harness or ECM.
PREPARATION:
(a) Disconnect the E5 E

Page 1124 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual - DIAGNOSTICSENGINE
DI-75
268 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC P0115 Engine Coolant Temperature Circuit
DTC P0117 Engine Coolant Temperature Circuit Low
Input
DTC P0118 Engine Coolan

- DIAGNOSTICSENGINE
DI-75
268 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC P0115 Engine Coolant Temperature Circuit
DTC P0117 Engine Coolant Temperature Circuit Low
Input
DTC P0118 Engine Coolant Temperature Circuit High
Input
CIRCUIT DESCRIPTION
A thermistor is built in the Engine Coolant Temperature (ECT) sensor and changes the resistance value ac-
cording to the engine coolant temperature.
The structure of the sensor and connection to the ECM is the same the Intake Air Temperature (IAT) sensor.
HINT:
If the ECM detects the DTC ºP0115, P0117 or P0118º, it operates the fail-safe function in which the ECT
is assumed to be 80 C (176 F).
DTC No.Proceed toDTC Detection ConditionTrouble Area
P0115Step 1
Open or short in engine cool-
ant temperature sensor circuit
for 0.5 sec.
P0117Step 4
Short in engine coolant tem-
perature sensor circuit for 0.5
sec.Open or short in engine coolant temperature sensor circuit
Engine coolant temperature sensor
ECM
P0118Step 2
Open in engine coolant tem-
perature sensor circuit for 0.5
sec.
HINT:
After confirming DTC ºP0115, P0117 or P0118,º use the OBD II scan tool or the hand-held tester to confirm
the engine coolant temperature from the DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL.
Temperature DisplayedMalfunction
-40°C (-40°F)Open circuit
140°C (284°F) or moreShort circuit
MONITOR DESCRIPTION
The ECT (Engine Coolant Temperature) sensor is used to monitor the engine coolant temperature. The ECT
sensor has a thermistor that varies its resistance depending on the temperature of the engine coolant. When
the coolant temperature is low, the resistance in the thermistor increases. When the temperature is high, the
resistance drops. The variations in resistance are reflected in the voltage output from the sensor.
The ECM monitors the sensor voltage and uses this value to calculate the engine coolant temperature.
When the sensor output voltage deviates from the normal operating range, the ECM interprets this as a fault
in the ECT sensor and sets a DTC.
Example:
When the ECM calculates that the ECT is less than -40C (-40F), or more than 140C (284F), and if either
the condition continues for 0.5 sec. or more, the ECM will set a DTC.
DI1LF-13

Page 1125 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual DI-76
- DIAGNOSTICSENGINE
269 Author: Date:
2004 LAND CRUISER (RM1071U)
MONITOR STRATEGY
P0115Engine coolant temperature sensor range check
(Fluttering)
Related DTCsP0117Engine coolant temperatur

Page 1126 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual A19963
2
1G-B
BR-W
E528 E5 19
THW
E2
E1 R 5V ECM
BR E 2
Engine Coolant Temp. Sensor
3
If1
- DIAGNOSTICSENGINE
DI-77
270 Author: Date:
2004 LAND CRUISER (RM1071U)
WIRING DIAGRAM
INSPECTION PROCEDUR

Page 1127 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual DI-78
- DIAGNOSTICSENGINE
271 Author: Date:
2004 LAND CRUISER (RM1071U)
1 Connect OBD II scan tool or hand-held tester, and read value of engine coolant
temperature.
PREPARATION:
(a) Connect the

Page 1128 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual A19552
Engine Coolant
Temp. Sensor
2
1THW
E2ECM
E2
- DIAGNOSTICSENGINE
DI-79
272 Author: Date:
2004 LAND CRUISER (RM1071U)
2 Check for open in harness or ECM.
PREPARATION:
(a) Disconnect the E2

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