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 1371 of 3115
DI-322
- DIAGNOSTICSENGINE
515 Author: Date:
2004 LAND CRUISER (RM1071U)
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
P2120:
VPA voltage0.2 V or less or 4.8 V or more fluttering
P2122:
VPA voltage0.2 V or less (When VPA2 angle 1 deg or more)
P2123:
VPA voltage4.8 V or more
P2125:
VPA2 voltage0.5 V or less or 4.8 V or more fluttering
P2127:
VPA2 voltage0.5 V or less (When VPA angle 1 deg or more)
P2128:
Following conditions are met:A and B
A. VPA voltage0.2 V or more and 3.45 V or less
B. VPA2 voltage4.8 V or more
P2138:
Following condition is met forA or B
A. Difference between VPA and VPA2 voltages0.02 V or less
B. Both following conditions are met:(a) and (b)
(a) VPA voltage0.2 V or less
(b) VPA2 voltage0.5 V or less
COMPONENT OPERATING RANGE
ParameterStandard Value
VPA voltageMore than 0.2 V and less than 4.8 V
VPA2 voltageMore than 0.5 V and Less than 4.8 V
Difference between VPA and VPA2 voltagesMore than 0.02 V
Page 1372 of 3115
A19759
A14
Accelerator Pedal Position Sensor
VPA1
EP1
VCP1BR-W
R-BECM
E9
2923
VPA2
EP2
VCP25
3
6
2
1
4R
L-R
W-R
WE9
E9
E9
E9
E926
27 22
28
VCP2 EPA2 VPA2 VCPAEPAVPA
- DIAGNOSTICSENGINE
DI-323
516 Author: Date:
2004 LAND CRUISER (RM1071U)
WIRING DIAGRAM
Page 1373 of 3115
FI7052DepressedReleased
DI-324
- DIAGNOSTICSENGINE
517 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.
Hand-held tester:
1 Connect hand-held tester, and read the voltage for accelerator pedal position
sensor data.
PREPARATION:
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch ON and push the hand-held tes-
ter main switch ON.
(c) Enter the following menus: DIAGNOSIS / ENHANCED
OBD II / DATA LIST / ETCS / ACCEL POS #1 and ACCEL
POS #2.
CHECK:
Read the voltage for the accelerator pedal position sensor data.
OK:
Accelerator pedalACCEL POS #1ACCEL POS #2
Released0.5 to 1.1 V1.2 to 2.0 V
Depressed2.6 to 4.5 V3.4 to 5.3 V
OK Go to step 5.
NG
Page 1374 of 3115
A21022
Wire Harness Side:
A14
Accelerator Pedal Position Sensor
EP2
VPA2
EP1
VCP2VPA1VCP1
A21033
E9
ECM Connector
VPA2
VCPAVPA
EPA2EPA
VCP2
- DIAGNOSTICSENGINE
DI-325
518 Author: Date:
2004 LAND CRUISER (RM1071U)
2 Check for open and short in harness and connector in VCPA, VCP2, VPA, VPA2
EPA and EPA2 circuit between ECM and accelerator pedal position sensor.
PREPARATION:
(a) Disconnect the A14 accelerator pedal position sensor
connector.
(b) Disconnect the E9 ECM connector.
CHECK:
Measure the resistance between the wire harness side connec-
tors.
OK:
Tester ConnectionSpecified Condition
VPA1 (A14-5) - VPA (E9-22)Below 1 W
EP1 (A14-3) - EPA (E9-28)Below 1 W
VCP1 (A14-6) - VCPA (E9-26)Below 1 W
VPA2 (A14-2) - VPA2 (E9-23)Below 1 W
EP2 (A14-1) - EPA2 (E9-29)Below 1 W
VCP2 (A14-4) - VCP2 (E9-27)Below 1 W
VPA1 (A14-5) or VPA (E9-22) -
Body ground10 kW or higher
EP1 (A14-3) or EPA (E9-28) -
Body ground10 kW or higher
VCP1 (A14-6) or VCPA (E9-26) -
Body ground10 kW or higher
VPA2 (A14-2) or VPA2 (E9-23) -
Body ground10 kW or higher
EP2 (A14-1) or EPA2 (E9-29) -
Body ground10 kW or higher
VCP2 (A14-4) or VCP2 (E9-27) -
Body ground10 kW or higher
NG Repair or replace harness or connector.
OK
Page 1375 of 3115
A19521A19757
EPA (-)
VCPA (+)
EPA2 (-) VCP2 (+)
Accelerator Pedal
Position Sensor
Connector
E9
A14
DI-326
- DIAGNOSTICSENGINE
519 Author: Date:
2004 LAND CRUISER (RM1071U)
3 Check voltage between terminals VCPA and EPA, and VCP2 and EPA2 of ECM
terminals.
PREPARATION:
(a) Turn the ignition switch ON.
(b) Disconnect the A14 accelerator pedal position sensor
connector.
CHECK:
Measure the voltage between the specified terminals of the E9
ECM connector.
OK:
Tester ConnectionSpecified Condition
VCPA (E9-26) - EPA (E9-28)4.5 to 5.5 V
VCP2 (E9-27) - EPA2 (E9-29)4.5 to 5.5 V
NG Replace ECM (See page SF-60).
OK
4 Replace accelerator pedal assembly (See page SF-58).
Go
Page 1376 of 3115
- DIAGNOSTICSENGINE
DI-327
520 Author: Date:
2004 LAND CRUISER (RM1071U)
5 Check if DTC output recur?
PREPARATION:
(a) Connect the hand-held tester to the DLC3.
(b) Disconnect the battery terminals or remove the EFI or ECD No. 1 fuse and ETCS fuse (Clear DTCs).
(c) Start the engine.
(d) Drive the engine at idle for 15 seconds or more.
CHECK:
Read the DTC output.
OK:
No DTC output.
OK System is OK.
NG
Replace ECM (See page SF-60).
Page 1377 of 3115
A21022
Wire Harness Side:
A14
Accelerator Pedal Position Sensor
EP2
VPA2
EP1
VCP2VPA1VCP1
A21033
E9
ECM Connector
VPA2
VCPAVPA
EPA2EPA
VCP2
DI-328
- DIAGNOSTICSENGINE
521 Author: Date:
2004 LAND CRUISER (RM1071U)
OBD II scan tool (excluding hand-held tester):
1 Check for open and short in harness and connector in VCPA, VCP2, VPA, VPA2
EPA and EPA2 circuit between ECM and accelerator pedal position sensor.
PREPARATION:
(a) Disconnect the A14 accelerator pedal position sensor
connector.
(b) Disconnect the E9 ECM connector.
CHECK:
Measure the resistance between the wire harness side connec-
tors.
OK:
Tester ConnectionSpecified Condition
VPA1 (A14-5) - VPA (E9-22)Below 1 W
EP1 (A14-3) - EPA (E9-28)Below 1 W
VCP1 (A14-6) - VCPA (E9-26)Below 1 W
VPA2 (A14-2) - VPA2 (E9-23)Below 1 W
EP2 (A14-1) - EPA2 (E9-29)Below 1 W
VCP2 (A14-4) - VCP2 (E9-27)Below 1 W
VPA1 (A14-5) or VPA (E9-22) -
Body ground10 kW or higher
EP1 (A14-3) or EPA (E9-28) -
Body ground10 kW or higher
VCP1 (A14-6) or VCPA (E9-26) -
Body ground10 kW or higher
VPA2 (A14-2) or VPA2 (E9-23) -
Body ground10 kW or higher
EP2 (A14-1) or EPA2 (E9-29) -
Body ground10 kW or higher
VCP2 (A14-4) or VCP2 (E9-27) -
Body ground10 kW or higher
NG Repair or replace harness or connector.
OK
Page 1378 of 3115
A19521A19757
EPA (-)
VCPA (+)
EPA2 (-) VCP2 (+)
Accelerator Pedal
Position Sensor
Connector
E9
A14
- DIAGNOSTICSENGINE
DI-329
522 Author: Date:
2004 LAND CRUISER (RM1071U)
2 Check voltage between terminals VCPA and EPA, and VCP2 and EPA2 of ECM
terminals.
PREPARATION:
(a) Turn the ignition switch ON.
(b) Disconnect the A14 accelerator pedal position sensor
connector.
CHECK:
Measure the voltage between the specified terminals of the E9
ECM connector.
OK:
Tester ConnectionSpecified Condition
VCPA (E9-26) - EPA (E9-28)4.5 to 5.5 V
VCP2 (E9-27) - EPA2 (E9-29)4.5 to 5.5 V
NG Replace ECM (See page SF-60).
OK
3 Replace accelerator pedal assembly (See page SF-58).
Go
Page 1379 of 3115
DI-330
- DIAGNOSTICSENGINE
523 Author: Date:
2004 LAND CRUISER (RM1071U)
4 Check if DTC output recur?
PREPARATION:
(a) Connect the OBD II scan tool to the DLC3.
(b) Disconnect the battery terminals or remove the EFI or ECD No. 1 fuse and ETCS fuse (Clear DTCs).
(c) Start the engine.
(d) Drive the engine at idle for 15 seconds or more.
CHECK:
Read the DTC output.
OK:
No DTC output.
OK System is OK.
NG
Replace ECM (See page SF-60).
Page 1380 of 3115
- DIAGNOSTICSENGINE
DI-331
524 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC P2121 Throttle/Pedal Position Sensor/Switch ºDº
Circuit Range/Performance
HINT:
This is repair procedure for the ºaccelerator pedal position sensorº.
CIRCUIT DESCRIPTION
Refer to DTC P2120 on page DI-318.
DTC No.DTC Detecting ConditionTrouble Area
P2121
Conditions (a) and (b) continue for 0.5 seconds:
(a) Difference between VPA and VPA2 exceeds the threshold
(b) IDL is OFFAccelerator pedal position sensor circuit
Accelerator pedal position sensor
ECM
MONITOR DESCRIPTION
The accelerator pedal position sensor is mounted on the accelerator pedal bracket. The accelerator pedal
position sensor has 2 sensor elements/signal outputs: VPA1 and VPA2. VPA1 is used to detect the actual
accelerator pedal angle (used for engine control) and VPA2 is used to detect malfunctions in VPA1. When
the difference between the voltage outputs of VPA1 and VPA2 deviate from the standard, the ECM con-
cludes the accelerator pedal position sensor has a malfunction. The ECM turns on the MIL and a DTC is
set.
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.
MONITOR STRATEGY
Related DTCsP2121Accelerator position sensor (rationality)
Required sensors/componentsAccelerator position sensor
Frequency of operationContinuous
Duration0.5 sec.
MIL operationImmediate
Sequence of operationNone
DIC2T-01