Komatsu PC200-8M0 Shop Manual page 613

301 Troubleshooting by failure code, Part 1
Failure code [CA222] Ambient Press Sens Low Error
Cause
Defective ambient pressure sensor
6 (improper input voltage to engine
controller)
7 Defective engine controller
Circuit diagram related to ambient pressure sensor
PC200, 200LC, 220, 220LC-8M0
Procedure, measuring location, criteria and remarks
a If no failure is found by checks on causes 1 to 5 and check result of cause
6 is abnormal, sensor is defective.
1. Turn starting switch to OFF position.
2. Insert T-adapters to connector ECM.
3. Turn starting switch to ON position.
Between ECM (3) and (38)
If no failure is found by above checks, engine controller is defective. (Since
this is an internal defect, troubleshooting cannot be performed.)
SEN06133-00
Sensor out-
Voltage
put
0.5 to 4.5 V
43
40-301