1986 TOYOTA LAND CRUISER ignition
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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 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
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 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 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 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
Page 1381 of 3115
FI7052DepressedReleased
DI-332
- DIAGNOSTICSENGINE
525 Author: Date:
2004 LAND CRUISER (RM1071U)
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)
Either of the following conditions is metA or B
A. Ignition switchON
B. Throttle control motor powerON
System is not under limp home mode due to accelerator pedal position sensor malfunction
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
|VPA - (VPA2 - 0.8)|*
*Corrected by learning valueMore than 0.4 V
WIRING DIAGRAM
Refer to DTC P2120 on page DI-318.
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 Replace ECM (See page SF-60).
NG