Start the engine and raise the engine speed to 2,500~3,000 RPM
Turn ON all electrical loads by turning on the headlamps, and by turning on the high blower motor, etc
Monitor the battery(ignition) voltage parameter on the Scantool data list
Specification :
Ambient temperature ℃(℉) | Reference Voltage(V) |
-20(-4) | Approx. 14.2~15.4 |
20(68) | Approx. 14.0~15.0 |
60(140) | Approx. 13.7~14.9 |
80(176) | Approx. 13.5~14.7 |
Is the battery voltage within the specification?
YES
Go to next step as below.
NO
Possibility of charging system malfunction. Repair or replace alternator and battery. Refer to Charging System group in Workshop manual. And then go to "Verification of Vehicle Repair" procedure.
Many malfunctions in the electrical system are caused by poor harness and terminals.
Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination,deterioration, or damage.
Has a problem been found?
YES
Repair as necessary and go to "Verification of vehicle Repair" procedure
NO
Go to "System inspection" procedure.
With ignition OFF, disconnect alternator connector
Ignition "ON" & Engine "OFF"
Measure voltage between terminals 1 of the alternator harness connector and chassis ground
Specification : Approx. 9~11V
Normal waveform with ignition "ON"
Is voltage within the specification?
YES
Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage. So, check poor connections and the related circuit between ECM and component thoroughly. Repair as necessary and go to "Verification of Vehicle Repair" procedure.
NO
Repair as necessary and go to "Verification of Vehicle Repair" procedure.
