Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSDAIHATSU1990CHARADE L3-0993CC 1.0LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSBAROMETRIC PRESSURE SENSORTESTING AND INSPECTION
1990 Daihatsu Charade L3-0993cc 1.0L
Barometric Pressure Sensor: Testing and Inspection
1990 Daihatsu Charade L3-0993cc 1.0LSECTION Testing and Inspection
Fig. 8 Pressure Sensor Specification Chart.:
Fig. 9 Pressure Sensor Specification Chart.:
1. Connect ECU test harness.
2. Proceed as follows:
a. Measure voltage between terminals 9 and 29.
b. Refer to Fig. 8 for voltage specification.
c. If voltage does not conform to specification, measure voltage between terminals 31 and 29 on the ECU test harness.
d. Ensure voltage is 4.5-5.5 volts, then replace pressure sensor. When the pressure sensor is replaced it is necessary to replace the fuel and air filter.
e. If voltage between terminals 31 and 29 is not 4.5-5.5 volts, check wiring between ECU and pressure sensor.
f. Apply 7.87 inches of vacuum to the pressure sensor.
g. Ensure voltage between terminals 9 and 29 drops by .55 volts.
h. If voltage does not drop as specified, replace the pressure sensor.
3. Perform Pressure Sensor circuit test.
Fig. 43 ECU System Diagnosis, Pressure Sensor Check (Part 1 Of 2):
Fig. 43 ECU System Diagnosis, Pressure Sensor Check (Part 2 Of 2):
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.