19 (2)

DTC Code	DTC Name
19 (2)	Accelerator Position Sensor Range / Performance Problem

DESCRIPTION

Tech Tips

This is the repair procedure of "accelerator pedal position sensor".
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 opening angle of the accelerator pedal. Since this sensor is electronically controlled with hall elements, accurate control and reliability can be obtained. It has the 2 sensors to detect accelerator position and malfunctions of the accelerator position sensor.

In the accelerator pedal position sensor, the voltage applied to pedal terminals VPA and VPA2 of the ECM changes between 0 V and 5 V in proportion to the opening angle of the accelerator pedal. The VPA is a signal to indicate the actual accelerator pedal opening angle which is used for engine control, and the VPA2 is a signal to indicate information about the opening angle which is used for detecting malfunctions. Based on signals input from terminals VPA and VPA2, the ECM judges the current opening angle of the accelerator pedal and controls the injection pump.

DTC No.	DTC Detecting Condition	Trouble Area
19 (2)	Either of ECM sensors completed learning, and electric potential difference of No. 1 and No. 2 sensors has become more than 1.2 V or less than 0.4 V.	Open or short in accelerator pedal position sensor circuit Accelerator pedal position sensor ECM
One of the following continues more than 2.0 seconds. When the electrical potential difference of No. 1 and No. 2 sensors is not within the specified value. VPA2 is greater than or equal to 4.9 V Accelerator idling criterion voltage of No. 1 and No. 2 is less than 0.04 V.

DTC No.

DTC Detecting Condition

Trouble Area

19 (2)

Either of ECM sensors completed learning, and electric potential difference of No. 1 and No. 2 sensors has become more than 1.2 V or less than 0.4 V.

Open or short in accelerator pedal position sensor circuit
Accelerator pedal position sensor
ECM

One of the following continues more than 2.0 seconds.

When the electrical potential difference of No. 1 and No. 2 sensors is not within the specified value.
VPA2 is greater than or equal to 4.9 V
Accelerator idling criterion voltage of No. 1 and No. 2 is less than 0.04 V.

Tech Tips

After confirming DTC 19 (2), use the intelligent tester to confirm the throttle valve opening percentage.

Trouble area	Accelerator pedal position expressed as voltage
	Accelerator pedal released		Accelerator pedal depressed
	ACCEL POS #1	ACCEL POS #2	ACCEL POS #1	ACCEL POS #2
VC circuit open	0 to 0.2 V	0 to 0.2 V	0 to 0.2 V	0 to 0.2 V
VPA circuit open or ground short	0 to 0.2 V	1.2 to 2.0 V	0 to 0.2 V	3.4 to 5.3 V
VPA2 circuit open or ground short	0.5 to 1.1 V	0 to 0.2 V	2.6 to 4.5 V	0 to 0.2 V
E2 circuit open	4.5 to 5.5 V	4.5 to 5.5 V	4.5 to 5.5 V	4.5 to 5.5 V

WIRING DIAGRAM

INSPECTION PROCEDURE

Tech Tips

Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

When using intelligent tester:

PROCEDURE

READ VALUE USING INTELLIGENT TESTER (ACCELERATOR POSITION)
1. Connect the intelligent tester to the DLC3.
2. Turn the ignition switch ON.
3. Enter the following menus: Powertrain / Engine and ECT / Data List / Accel Position.
4. Check that the value displayed on the intelligent tester changes when repeatedly depressing and releasing the accelerator pedal.
  
  OK
  
  Value changes.
OK
REPLACE ECM

NG

OK
Value changes.

CHECK WIRE HARNESS (ECM - ACCELERATOR PEDAL POSITION SENSOR)

Disconnect the A13 accelerator pedal position sensor connector.
Disconnect the E21 and E22 ECM connectors.

Measure the resistance of the wire harness side connectors.

Standard resistance

Tester Connection	Specified Condition
A13-1 (VCP2) - E22-1 (VC)	Below 1 Ω
A13-2 (EPA2) - E22-9 (E2)	Below 1 Ω
A13-3 (VPA2) - E21-12 (VPA2)	Below 1 Ω
A13-4 (VCPA) - E21-6 (VCPA)	Below 1 Ω
A13-5 (EPA) - E21-4 (EPA)	Below 1 Ω
A13-6 (VPA) - E21-5 (VPA)	Below 1 Ω
A13-1 (VCP2) or E22-1 (VC) - Body ground	10 kΩ or higher
A13-2 (EPA2) or E22-9 (E2) - Body ground	10 kΩ or higher
A13-3 (VPA2) or E21-12 (VPA2) - Body ground	10 kΩ or higher
A13-4 (VCPA) or E21-6 (VCPA) - Body ground	10 kΩ or higher
A13-5 (EPA) or E21-4 (EPA) - Body ground	10 kΩ or higher
A13-6 (VPA) or E21-5 (VPA) - Body ground	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

REPLACE ACCELERATOR PEDAL ROD ASSEMBLY

When not using intelligent tester:

PROCEDURE

CHECK ECM (VPA, VPA2 VOLTAGE)

Turn the ignition switch ON.

Measure the voltage of the ECM connector.

Standard voltage

Accelerator pedal position is released
Tester Connection	Specified Condition
E21-5 (VPA) - E21-4 (EPA)	0.5 to 1.1 V
E21-12 (VPA2) - E22-9 (E2)	1.2 to 2.0 V

Standard voltage

Accelerator pedal position is depressed
Tester Connection	Specified Condition
E21-5 (VPA) - E21-4 (EPA)	2.6 to 4.5 V
E21-12 (VPA2) - E22-9 (E2)	3.4 to 5.3 V

OK

REPLACE ECM

NG

CHECK WIRE HARNESS (ECM - ACCELERATOR PEDAL POSITION SENSOR)

Disconnect the A13 accelerator pedal position sensor connector.
Disconnect the E21 and E22 ECM connectors.

Measure the resistance of the wire harness side connectors.

Standard resistance

Tester Connection	Specified Condition
A13-1 (VCP2) - E22-1 (VC)	Below 1 Ω
A13-2 (EPA2) - E22-9 (E2)	Below 1 Ω
A13-3 (VPA2) - E21-12 (VPA2)	Below 1 Ω
A13-4 (VCPA) - E21-6 (VCPA)	Below 1 Ω
A13-5 (EPA) - E21-4 (EPA)	Below 1 Ω
A13-6 (VPA) - E21-5 (VPA)	Below 1 Ω
A13-1 (VCP2) or E22-1 (VC) - Body ground	10 kΩ or higher
A13-2 (EPA2) or E22-9 (E2) - Body ground	10 kΩ or higher
A13-3 (VPA2) or E21-12 (VPA2) - Body ground	10 kΩ or higher
A13-4 (VCPA) or E21-6 (VCPA) - Body ground	10 kΩ or higher
A13-5 (EPA) or E21-4 (EPA) - Body ground	10 kΩ or higher
A13-6 (VPA) or E21-5 (VPA) - Body ground	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

REPLACE ACCELERATOR PEDAL ROD ASSEMBLY

ECD SYSTEM, Diagnostic DTC:19 (2)