Accelerator Pedal Position Sensor: Testing and Inspection
INSPECTION OF ELECTRICAL EQUIPMENT
#001 Inspection of combination switch
AK14A connector connection table
- If there IS any abnormality, replace the switch.
#031 Inspection of clutch switch
- If there is any abnormality, replace the switch.
#157 Inspection of idling speed adjustment potentiometer
- Apply 5 V DC to terminals 1 and 2 of the idling speed adjustment potentiometer.
- Turn the knob fully counterclockwise. Then, measure the output voltage across terminals 2 and 3 (see the diagrams) while slowly turning the knob clockwise.
- If any measurement is out of specification, replace the idling speed adjustment potentiometer.
#163 Inspection of torque limit switch
- If there is any abnormality, replace the switch.
#262 Inspection of water temperature sensor
- Place the water temperature sensor in a container filled with engine oil.
- Heat the oil to each of the specified temperatures. Stir the oil well while doing so.
- Measure the resistance between terminals 1 and 2.
- If either measurement is out of specification, replace the sensor.
#263 Inspection of engine speed sensor
- Measure the resistance between terminals 1 and 2.
Standard value: (at 20 °C {68 °F}) 860 ± 86 ohms
- If the measurement is out of specification, replace the sensor.
#265 Inspection of vehicle speed sensor
- With the battery voltage applied to terminals 1 and 2, slowly turn part A of the sensor.
- Measure the maximum voltage (high pulse voltage B) and minimum voltage (low pulse voltage C) occurring at each specified pair of terminals.
- If any measurement IS out of specification, replace the sensor.
#305 Inspection of boost air temperature sensor
- Place the boost air temperature sensor in a container filled with engine oil.
- Heat the oil to each of the specified temperatures. Stir the oil well while doing so.
- Measure the resistance between terminals 1 and 2.
- If either measurement IS out of specification, replace the sensor.
#318 Inspection of boost pressure sensor
- Apply 5 V DC to terminals 3 and 1.
- Apply air pressure A. Gradually increase it and, while doing so, measure the output voltage occurring at terminals 2 and 1 (see the diagram).
- If any measurement IS out of specification, replace the sensor.
#319 Inspection of common rail pressure sensor
- The sensor cannot easily be inspected in isolation, so you must evaluate it indirectly by inspection of system harnesses and related parts.
- If there is no abnormality in any related part but the system is abnormal, replace the common rail.
#320 Inspection of cylinder recognition sensor
- Measure the resistance between terminals 2 and 3.
Standard value: 200 to 1800 ohms
- If the measurement is out of specification, replace the sensor.
#323 Inspection of fuel temperature sensor
- Measure the resistance between terminals 1 and 2.
- If any measurement is out of specification, replace the sensor.
#324 Inspection of accelerator pedal position sensor
[Inspection]
- Apply 5 V DC to terminals 4 and 2 of the accelerator pedal position sensor.
- Measure the output voltage at terminals 2 and 5 (sensor 1) and the output voltage at terminals 1 and 2 (sensor 2) with the accelerator lever in each specified position.
A: Position In which accelerator lever is touching stopper
B: Position at which continuity between terminals 2 and 3 disappears as accelerator pedal is pushed downward
C: Position in which accelerator lever is touching stopper bolt
- If any output voltage is out of specification, make an adjustment.
- If any output voltage is still out of specification when you have made an adjustment, replace the sensor.
[Adjustment]
- To adjust the output voltage for the idling position A, loosen the screws and move the accelerator pedal position sensor. Tighten the screws after making the adjustment.
- To adjust the output voltage for the full load position C, loosen the nut and make the adjustment using the stopper bolt. After making the adjustment, lock the stopper bolt in position with the nut.
#565 Inspection of exhaust brake 3-way magnetic valve
- Perform the following checks. If there is any abnormality, replace the exhaust brake 3-way magnetic valve.
1. Check of operation
- Gradually increase from zero the voltage applied to terminals 1 and 2.
- Observe the voltage when the exhaust brake 3-way magnetic valve operates.
(Determine the magnet valve's OFF-ON operation from the operating sound.)
Standard value (min. operating voltage): 11 V or lower
2. Check of continuity and airtightness
- Vacuum pressure applied during check: -100 kPa (-29.5 in.Hg, -750 mmHg)
#574 Inspection of MPROP
(injection quantity adjustment valve)
- Measure the resistance between terminals 1 and 2.
standard value: 2.6 to 3.15 ohms
- If the measurement is out of specification, replace the supply pump.
#582 Inspection of injector magnetic valve
- Measure the resistance between terminals 1 and 2.
Standard value (at 20 °C {68 °F}) 0.255 ± 0.04 ohms
- If the measurement is out of specification, replace the injector.
#828 Inspection of fuel injection rate adjustment resistor
- Measure the resistance of the resistor number marked on the fuel injection rate adjustment resistor.
- If the measurement IS out of specification, replace the fuel injection rate adjustment resistor with one that has the same resistor number and same specified resistance.
CAUTION: The fuel injection rate adjustment resistor is matched to the engine. If you replace it, be sure to replace it with one that has the same resistor number.