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Failure code [CA123] Chg Air Press Sensor Low Error

Failure code [CA123] Chg Air Press Sensor Low Error


Failure code CA123
Trouble Charge air pressure sensor low error (Engine controller system )

Contents of trouble failure code CA123
• Pressure signal circuit of boost pressure/temperature sensor mendeteksi low voltage.


Action of controller
• Fixes charge pressure value and continues operation.


Problem that appears on machine
Menyebabkan engine output lower

Related information
• Signal voltage on boost pressure side of boost pressure/temperature sensor can be checked with
monitoring function. (Code: 36501 Boost pressure sensor voltage)

• Method of reproducing failure code: Turn starting switch ON.


Prosedur Troublshooting Failure code [CA123]


1.Defective sensor power supply 2 system
If failure code [CA187] is also indicated, carry out troubleshooting
for it first.

2.Defective boost pressure/ temperature sensor [pressure signal system]
BOOST PRESS & IMT

  • Between (3) – (1) Voltage Power supply 4.75 – 5.25 V


3.Ground fault in wiring harness (Short circuit with GND circuit )
Prepare with starting switch OFF, then carry out troubleshooting without turning starting switch ON

  • BOOST PRESS & IMT Wiring harness between CE01 (female) (44)  (female) (4)Resistance Min. 100  kz


4. Short circuit in wiring harness (with another wiring  harness)
a Prepare with starting switch OFF, then carry out troubleshooting without turning starting switch ON.

  • Wiring harness between CE01 (female) (44) BOOST PRESS & IMT (female) (4) and between CE01 (female) (47) – JC02 –  BOOST PRESS & IMT (female) (1) Resistance Min. 100 kz

5.Defective wiring harness connector
Connecting parts between boost pressure/temperature sensor – engine wiring harness – engine controller may be defective. Check them directly.
  • Looseness of connector, breakage of lock, or breakage of seal
  • Corrosion, bend, breakage, push-in, or expansion of pin
  • Moisture or dirt in connector or defective insulation

6. Defective engine controller
Prepare with starting switch OFF, then turn starting switch ON and carry out troubleshooting
  • CE01 Between (37) – (47)  Voltage Power supply 4.75 – 5.25


Charge-air-pressure-sensor
gambar-Charge-air-pressure-sensor