Dtc: P2120 Throttle/Pedal Position Sensor/Switch "D" Circuit - Hino 238 Workshop Manual

DTC: P2120
P2120: Throttle/Pedal Position Sensor/Switch "D" Circuit
INFORMATION
Engine
ECU
1. Technical description
–
•
<Description of malfunction>
• Neither of accelerator sensors are properly functioning.
2. DTC set condition
(1) DTC detection condition
• Engine ECU power supply voltage is in the range of 10 V to 16 V.
• Starter switch ON.
• Engine running or starter LOCK
(2) Judgement criteria
• Both sensors are out of order at the same time.
3. Reset condition
• Immediately after normal operation is restored.
4. Indication, warning or system control regulation when the DTC is set.
• MIL: ON
• Diag lamp: OFF
• Cruise control function is not available.
• Idling stop system is not available.
5. Symptoms on the vehicle when the DTC is set
<Symptoms on the vehicle due to backup control (fail safe function)>
• Cruise control does not work.
• Idling stop system does not work.
<Symptoms on the vehicle due to malfunction>
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•
6. Pre-inspection work
• Check that the battery voltage is in the normal range.
7. After-inspection work
• Clear all past DTCs.
• Check that no DTC is stored after test drive.
8. Estimated failure factors
• Malfunction of both sensors
• Malfunction of engine ECU
ENGINE CONTROL SYSTEM (J08E)
KRS K91 KRS
(AVC4)
LCS K93 LCS
(ADG8)
K62 K92 K62
(ACS2)
KRR K8Y KRR
(AVC3)
LCR K90 LCR
(ADG7)
K5Z K8Z K5Z
(ACS1)
K91
(VCC2)
K93
(GND2)
K92
Accelerator
(SIG2)
K8Y
sensor
(VCC1)
K90
(GND1)
K8Z
(SIG1)
4–977
EN01H16F01030F03001126
SAPH16F010300755