DLC - p120

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DIAGNOSTICS ENGINE

DI67

1HDFTV ENGINE SUP (RM1179E)

DTC P1120/19 Accel. Position Sensor circuit (Open/Short)

CIRCUIT DESCRIPTIONThe accelerator pedal position sensor is mounted at the accelerator pedal and detects the accelerator pedal

opening angle. When the accelerator pedal is fully closed, a voltage of approximately1.0 V is applied to ter-

minals VA, VAS of the engine ECU. The voltage applied to the terminals VA, VAS of the engine ECU in-

creases in proportion to the opening angle of the accelerator pedal and becomes approximately 3.8 V when

the accelerator pedal is fully opened. The engine ECU judges the vehicle driving conditions from these sig-

nals input from terminals VA, VAS and uses them as one of the conditions to control the injection volume

and diesel throttle valve position. The idle switch is mounted in the accelerator pedal position sensor and

sends the IDL signal to the engine ECU when the accelerator pedal is fully depressed.

This system has 2 way accelerator pedal position sensor and accelerator pedal closed position switch for

fail safe.

DTC No. DTC Detection Condition Trouble Area

P1120/19Open or short in accelerator pedal position sensor circuit for

0.05 sec. or more

SOpen or short in accelerator pedal position sensor circuit

SAccelerator pedal position sensor

SEngine ECU

HINT:

After confirming DTC P1120/19 use the intelligent tester II to confirm the accelerator pedal opening percent-

age and accelerator pedal close position switch condition.

Accelerator pedal opening position

expressed as percentage Trouble area

Accelerator pedal fully closed Accelerator pedal fully open

0% 0% VCC line openVA, VAS line open or short

Approx.100% Approx. 100% E2C line open

DIDYO01

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A23867

Engine ECU

VCC

VA

VAS

IDL

E2C

PDL

5 V

+B

+B

E1

E18

33

27

35

15

34

16

LR

GR

If5

IZ1

4

5

1

3

2

A17Accelerator PedalPosition Sensor

A32Accelerator PedalClosed Position Switch

E18

E18

E18

E18

E18

2BR

RY

PL

LGB

6B

ED

1

IZ1

4

Ih1 BRBR

VC

VA

VAS

IDL

EC

LGB

BRW

3

GR

21

BR10

6D

25

J/B No. 6

DI68DIAGNOSTICS ENGINE


WIRING DIAGRAM

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FI7052

BE6653A05026 A05257

4(VC)

ON

()(+)

DIAGNOSTICS ENGINE

DI69

1HDFTVENGINESUP (RM1179E)

INSPECTIONPROCEDURE

WhenusingintelligenttesterII:

1 ConnectintelligenttesterII,andreadacceleratorpedalopeningpercentage.

PREPARATION:

(a) ConnecttheintelligenttesterIItotheDLC3.

(b) TurntheignitionswitchONandpushtheintelligenttester

IImainswitchON.

(c) Depressandreleasetheacceleratorpedal

CHECK:

(a) Readtheacceleratorpedalopeningpercentage.

Resalt:

Condition Proceedto

Valuechangesinaccordancewithaccel-

eratorpedalposition A

Valueisfixedat 100% B

Value is fixed at 0% C

A Check for intermittent problems(SeepageDI4).

B Go to step 6.

C

2 Check voltage between terminal 4 of wire harness side connector and bodyground.

PREPARATION:

(a) Disconnect the accelerator pedal position sensor con-

nector.(b) Turn the ignition switch ON.

CHECK:

Measure the voltage between terminal 4 of wire harness side

connector and body ground.

OK:

Voltage: 4.5 to 5.5 V

NG Go to step 5.

OK
http://m_di_0004.pdf/http://m_di_0004.pdf/http://m_di_0004.pdf/http://m_di_0004.pdf/

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A23883

E2C

VA

VAS



3 Check voltage between terminals VA, VAS and E2C of engine ECU.

PREPARATION:

(a) Remove the glove compartment door.

(b) Turn the ignition switch ON.CHECK:

Measure the voltage between terminals VA, VAS and E2C of

the engine ECU.

OK:

Accelerator pedal Voltage

Fully closed 0.6 to 1.3 V

Fully open 2.8 to 4.5 V

OK Check and replace engine ECU

(SeepageIN1

9).

NG

4 Check for open and short in harness and connector between engine ECU andacceleratorpedalpositionsensor(VA,VASline)(SeepageIN19).

NG Repair or replace harness or connector.

OK

Replace accelerator pedal position sensor.
http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/

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A23883

E2C VCC

A23883

E2C

DIAGNOSTICS ENGINE

DI71


5 Check voltage between terminals VCC and E2C of engine ECU.

PREPARATION:


(b) Turn the ignition switch ON.CHECK:

Measure the voltage between terminals VCC and E2C of the

engine ECU connector.

OK:


NG Check and replace engine ECU(SeepageIN19).

OK

Check for open in harness and connector between engine ECU and accelerator pedal positionsensor(VCCline)(SeepageIN19).

6 Check resistance between terminals E2C of engine ECU and body ground.

PREPARATION:


CHECK:

Measure the resistance between terminals E2C of the engine

ECU connector and body ground.

OK:

Resistance: Below 1


OK

7 Check for open and short in harness and connector between engine ECU andacceleratorpedalpositionsensor(E2Cline)(SeepageIN19).


OK
http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/

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BE6653A05026 A05257

4 (VC)

ON

()(+)

A23883

E2C

VA

VAS




When not using intelligent tester II:

1 Check voltage between terminal 4 of wire harness side connector and bodyground.

PREPARATION:

(a) Disconnect the accelerator pedal position sensor con-

nector.

(b) Turn the ignition switch ON.

CHECK:

Measure the voltage between terminal 4 of wire harness side

connector and body ground.

OK:Voltage: 4.5 to 5.5 V

NG Go to step 4.

OK

2 Check voltage between terminals VA, VAS and E2C of engine ECU.

PREPARATION:



CHECK:

Measure the voltage between terminals VA, VAS and E2C of

the engine ECU.

OK:

Accelerator pedal Voltage

Fully closed 0.6 to 1.3 V

Fully open 2.8 to 4.5 V

OK Check and replace engine ECU(SeepageIN19).

NG
http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/

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A23883

E2C VCC

DIAGNOSTICS ENGINE

DI73


3 Check for open and short in harness and connector between engine ECU andacceleratorpedalpositionsensor(VA,VASline)(SeepageIN19).


OK


4 Check voltage between terminals VCC and E2C of engine ECU.

PREPARATION:



CHECK:

Measure the voltage between terminals VCC and E2C of the

engine ECU connector.

OK:



OK

Check for open in harness and connector between engine ECU and accelerator pedal positionsensor(VCCline)(SeepageIN19).
http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/http://m_in_0019.pdf/

DLC - p120

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