TOYOTA LAND CRUISER 1986 Factory Repair Manual
Manufacturer: TOYOTA, Model Year: 1986, Model line: LAND CRUISER, Model: TOYOTA LAND CRUISER 1986Pages: 3115, PDF Size: 54.88 MB
Page 1361 of 3115
A19973
ECM
+BM
E86
BatteryIG1 ETCS
1B 1Engine Room J/B
Id3 2
2
F15
FL BlockY-B Y-B Y-B1 2
1C
MAIN
B-G DI-312
- DIAGNOSTICSENGINE
505 Author: Date:
2004 LAND CRUISER (RM1071U)
WIRING DIAGRAM
Page 1362 of 3115
A19977
Engine Room J/B
ETCS
A19521A19629
+BM(+)
E7
E8
E1 (-)
ECM Connector
- DIAGNOSTICSENGINE
DI-313
506 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the
engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help deter-
mine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean
or rich, as well as other data from the time when a malfunction occurred.
1 Check ETCS fuse.
PREPARATION:
Remove the ETCS fuse from the engine room J/B.
CHECK:
Check the continuity of the ETCS fuse.
OK:
Continuity
NG Check for short in all harness and components
connected to ETCS fuse.
OK
2 Check voltage between terminal +BM and E1 of ECM connector.
CHECK:
Measure the voltage between the specified terminals of the E7
and E8 ECM connector.
OK:
Tester ConnectionSpecified Condition
+BM (E8-6) - E7 (E7-1)9 to 14 V
OK Check for intermittent problems (See page
DI-3).
NG
Page 1363 of 3115
A21035
E8
+BM
ECM Connector
A19977
Engine Room J/B
ETCS Fuse
DI-314
- DIAGNOSTICSENGINE
507 Author: Date:
2004 LAND CRUISER (RM1071U)
3 Check for open or short in harness or connector between battery and ETCS fuse,
ETCS fuse and ECM.
Check the harness and the connector between the ETCS
fuse and the ECM:
PREPARATION:
(a) Remove the ETCS fuse from the engine room J/B.
(b) Disconnect the E8 ECM connector.
CHECK:
Measure the resistance between the wire harness side connec-
tor.
OK:
Tester ConnectionSpecified Condition
Engine Room J/B (ETCS fuse
terminal 2) - +BM (E8-6)Below 1 W
Engine Room J/B (ETCS fuse
terminal 2) or +BM (E8-6) -
Body ground
10 kW or higher
Check the harness and connector between the ETCS fuse
and the battery:
PREPARATION:
(a) Remove the ETCS fuse from the engine room J/B.
(b) Disconnect the battery positive terminal.
CHECK:
Measure the resistance between the wire harness side connec-
tor.
OK:
Tester ConnectionSpecified Condition
Engine Room J/B (ETCS fuse
teminal 1) - Battery positive terminalBelow 1 W
Engine Room J/B (ETCS fuse
terminal 1) or
Battery positive terminal - Body ground
10 kW or higher
NG Repair or replace harness or connector.
OK
Check engine room J/B.
Page 1364 of 3115
- DIAGNOSTICSENGINE
DI-315
508 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC P2119 Throttle Actuator Control Throttle Body
Range/Performance
CIRCUIT DESCRIPTION
The Electric Throttle Control System (ETCS) is composed of a throttle motor that operates the throttle valve,
a throttle position sensor that detects the opening angle of the throttle valve, an accelerator pedal position
sensor that detects the accelerator pedal position, and the ECM that controls the ETCS system.
The ECM operates the throttle motor to position the throttle valve for proper response to driver inputs. The
throttle position sensor, mounted on the throttle body, detects the opening angle of the throttle valve and
provides this signal to the ECM so that the ECM can regulate the throttle motor.
DTC No.DTC Detection ConditionTrouble Area
P2119Throttle opening angle continues to vary greatly from target
throttle opening angleElectric throttle control system
Throttle body
MONITOR DESCRIPTION
The ECM determines the ºactualº throttle angle based on the throttle position sensor signal. The ºactualº
throttle position is compared to the ºtargetº throttle position commanded by the ECM. If the difference of
these two values exceeds a specified limit, the ECM interprets this as a fault in the ETCS (Electronic Throttle
Control System). The ECM turns on the MIL and a DTC is set.
FAIL SAFE
If the ETCS (Electronic Throttle Control System) has a malfunction, the ECM cuts off current to the throttle
control motor. The throttle control valve returns to a predetermined opening angle (approximately 16°) by
the force of the return spring. The ECM then adjusts the engine output by controlling the fuel infection (inter-
mittent fuel-cut) and ignition timing in accordance with the accelerator pedal opening angle to enable the
vehicle to continue at a minimum speed.
If the accelerator pedal is depressed firmly and slowly, the vehicle can be driven slowly.
If a ºpassº condition is detected and then the ignition switch is turned OFF, the fail-safe operation will stop
and the system will return to normal condition.
MONITOR STRATEGY
Related DTCsP2119Electronic throttle control system failure
Rid / tMain sensorsThrottle actuator motorRequired sensors/componentsRelated sensorsThrottle position sensor
Frequency of operationContinuous
Duration1 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
The monitor will run whenever the follow-
ing DTCs are not presentSee ºList of disable a monitorº (on page DI-3)
The typical enabling condition is not avail-
able-
DIC2R-01
Page 1365 of 3115
DI-316
- DIAGNOSTICSENGINE
509 Author: Date:
2004 LAND CRUISER (RM1071U)
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Difference between ºtarget throttle positionº and ºactual
throttle positionº0.3 V or more
COMPONENT OPERATING RANGE
Standard Value
Commanded throttle position and current throttle position are nearly same
WIRING DIAGRAM
Refer to DTC P2102 and P2103 on page DI-302.
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the
engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help deter-
mine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean
or rich, as well as other data from the time when a malfunction occurred.
1 Are there any other codes (besides DTC P2119) being output?
PREPARATION:
(a) Connect the hand-held tester or the OBD II scan tool to the DLC3.
(b) Turn the ignition switch ON and push the hand-held tester or OBD II scan tool main switch ON.
(c) When using hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC
INFO / CURRENT CODES.
CHECK:
Read the DTC using the hand-held tester or the OBD II scan tool.
RESULT:
Display (DTC Output)Proceed to
P2119A
ºP2119º and other DTCB
HINT:
If any other codes besides P2119 are output, perform the troubleshooting for those DTCs first.
B Go to relevant DTC chart (See page DI-36).
A
Page 1366 of 3115
A21034
T16
Component Side:
M+M- Throttle Control Motor and Sensor
- DIAGNOSTICSENGINE
DI-317
510 Author: Date:
2004 LAND CRUISER (RM1071U)
2 Check throttle control motor.
PREPARATION:
Disconnect the throttle control motor and sensor connector.
CHECK:
Measure the resistance between terminals of the throttle con-
trol motor.
OK:
Tester ConnectionSpecified Condition
M+ (T16-2) - M- (T16-1)0.3 to100 W (20°C (68°F))
NG Replace throttle body (See page SF-36).
OK
3 Replace ECM and clear DTC (Check if DTC outputs reoccur).
PREPARATION:
(a) Replace ECM.
(b) Clear the DTC (See page DI-3).
(c) Start and warm up the engine.
(d) Run the engine at idle for 15 seconds or more.
CHECK:
Read the DTC using the hand-held tester or the OBD II scan tool.
OK:
No DTC output.
OK System is normal.
NG
Replace throttle body.
Page 1367 of 3115
DI-318
- DIAGNOSTICSENGINE
511 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC P2120 Throttle/Pedal Position Sensor/Switch ºDº
Circuit
DTC P2122 Throttle/Pedal Position Sensor/Switch ºDº
Circuit Low Input
DTC P2123 Throttle/Pedal Position Sensor/Switch ºDº
Circuit High Input
DTC P2125 Throttle/Pedal Position Sensor/Switch ºEº
Circuit
DTC P2127 Throttle/Pedal Position Sensor/Switch ºEº
Circuit Low Input
DTC P2128 Throttle/Pedal Position Sensor/Switch ºEº
Circuit High Input
DTC P2138 Throttle/Pedal Position Sensor/Switch
ºDº/ºEº Voltage Correlation
HINT:
This is the repair procedure for the ºaccelerator pedal position sensorº.
DIC2S-01
Page 1368 of 3115
A19694A19803
5
3.7 to 4.4
2.9 to 3.6
1.6
1.4
025 IC No. 1
IC No. 2
Accelerator Pedal
Position SensorECM
VPA
EPA
VCPA
VPA2
EPA2
VCP2Usable Range
Magnet
Magnet
Accelerator Pedal Position Sensor Output Voltage (V)
: Accelerator Pedal Fully Released
: Accelerator Pedal Fully DepressedAccelerator Pedal Turning Angle (deg)*
2*1
*1
*2
- DIAGNOSTICSENGINE
DI-319
512 Author: Date:
2004 LAND CRUISER (RM1071U)
CIRCUIT DESCRIPTION
HINT:
This electrical throttle system does not use a throttle cable.
This accelerator pedal position sensor is a non-contact type.
The accelerator pedal position sensor is mounted in the accelerator pedal to detect the angle of the accelera-
tor pedal. This sensor is electronically controlled and uses Hall-effect elements.
In the accelerator pedal position sensor, the voltage applied to terminals VPA and VPA2 of the ECM changes
between 0 V and 5 V in proportion to the angle of the accelerator pedal. The VPA is a signal to indicate the
actual accelerator pedal angle and is used for the engine control. VPA2 is used to detect malfunctions of
the sensor itself.
The ECM judges the current angle of the accelerator pedal from these signals input from terminals VPA and
VPA2, and the ECM controls the throttle motor based on these signals.
Page 1369 of 3115
DI-320
- DIAGNOSTICSENGINE
513 Author: Date:
2004 LAND CRUISER (RM1071U)DTC No.
DTC Detection Condition
(Open or short in accelerator pedal position sensor circuit)Main trouble Area
P2120Condition (a) continues for 0.5 seconds or more:
(a) VPA 0.2 V and VPA2 0.97 deg, or VPA 4.8 VAccelerator pedal position sensor
ECM
P2122
Condition (a) and (b) continues for 0.5 seconds or more:
(a) VPA 0.2 V
(b) VPA2 0.97 degAccelerator pedal position sensor
VCPA circuit open
VPA circuit open or ground short
ECM
P2123Condition (a) continues for 2.0 seconds or more:
(a) VPA 4.8 VAccelerator pedal position sensor
EPA circuit open
ECM
P2125
Condition (a) continues for 0.5 seconds or more:
(a) VPA2 0.5 V and VPA 0.97 deg, or VPA2 4.8 V and
0.2 V VPA 3.45 VAccelerator pedal position sensor
ECM
P2127
Condition (a) and (b) continues for 0.5 seconds or more:
(a) VPA2 0.5 V
(b) VPA 0.97 degAccelerator pedal position sensor
VCP2 circuit open
VPA2 circuit open or ground short
ECM
P2128
Condition (a) and (b) continues for 2.0 seconds or more:
(a) VPA2 4.8 V
(a) 0.2 V VPA 3.45 VAccelerator pedal position sensor
EPA circuit open
ECM
P2138
Condition (a) or (b) continues for 2.0 seconds or more:
(a) |VPA - VPA2| 0.02 V
(b) VPA 0.2 V and VPA2 0.5 VVPA and VPA2 circuit are short circuited
Accelerator pedal position sensor
ECM
HINT:
After confirming DTC P2120, P2122, P2123, P2125, P2127, P2128 and P2138 use the OBD II scan tool
or the hand-held tester to confirm the accelerator pedal opening percentage.
Accelerator pedal position expressed as voltage
Trouble areaAccelerator pedal completely releasedAccelerator pedal fully depressedTrouble area
ACCEL POS #1ACCEL POS #2ACCEL POS #1ACCEL POS #2
VC circuit open0 to 0.2 V0 to 0.2 V0 to 0.2 V0 to 0.2 V
VPA circuit open or ground short0 to 0.2 V1.2 to 2.0 V0 to 0.2 V3.4 to 5.3 V
VPA2 circuit open or ground short0.5 to 1.1 V0 to 0.2 V2.6 to 4.5 V0 to 0.2 V
E2 circuit open4.5 to 5.5 V4.5 to 5.5 V4.5 to 5.5 V4.5 to 5.5 V
MONITOR DESCRIPTION
When VPA or VPA2, deviates from the standard, or the difference between the voltage outputs of the two
sensors is less than threshold, the ECM concludes that there is a defect in the accelerator pedal position
sensor. The ECM turns on the MIL and a DTC is set.
Example:
When the voltage output of the VPA below 0.2 V or exceeds 4.8 V.
FAIL SAFE
The accelerator pedal position sensor has two (main and sub) sensor circuits. If a malfunction occurs in ei-
ther of the sensor circuits, the ECM detects the abnormal signal voltage difference between the two sensor
circuits and switches to limp mode. In limp mode, the remaining circuit is used to calculate the accelerator
pedal opening to allow the vehicle to continue driving.
If both circuits malfunction, the ECM regards the opening angle of the accelerator pedal to be fully closed.
In this case, the throttle valve will remain closed as if the engine is idling.
If a ºpassº condition is detected and then the ignition switch is turned OFF, the fail-safe operation will stop
and the system will return to normal condition.
Page 1370 of 3115
- DIAGNOSTICSENGINE
DI-321
514 Author: Date:
2004 LAND CRUISER (RM1071U)
MONITOR STRATEGY
P2120Accelerator position sensor 1 (VPA) range check
(Fluttering)
P2122Accelerator position sensor 1 (VPA) range check
(Low voltage)
P2123Accelerator position sensor 1 (VPA) range check
(High voltage)
Related DTCsP2125Accelerator position sensor 2 (VPA2) range
check (Fluttering)
P2127Accelerator position sensor 2 (VPA2) range
check (Low voltage)
P2128Accelerator position sensor 2 (VPA2) range
check (High voltage)
P2138Accelerator position sensor correlation range
check
Required sensors/componentsAccelerator position sensor
Frequency of operationContinuous
Duration2 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever the follow-
ing DTCs are not presentSee ºList of disable a monitorº (on page DI-3)
Ignition switchON
Throttle control motor powerON