5.
Read "DTC Status" parameter.
Alternator output and power demand of all electrical loads and systems must be matched to each other as ideally as possible so that the entire system is reliable and trouble-free in operation. The ECM monitors alternator output deviation from the signal of the FR terminal of the alternator when the engine is running.
ECM sets DTC P0626 if the ECM detects that the alternator's output duty signal is 0%.
Item | Detecting Condition | Possible Cause |
DTC Strategy | ● Input signal check | ● Open or Short to Power in harness ● Faulty charging system |
Enable Conditions | ● Battery voltage ＜ 16V ● Engine speed : 600 ~ 4000 ● Engine coolant temp. ＞ 75℃ | |
Threshold Value | ● Duty calculated by Alternator PWM signal = 0% | |
Diagnostic Time | ● 100 sec. | |
MIL ON Condition | ● DTC only |
Connect scantool to Data Link Connector(DLC).
IG "ON".
Select "Diagnostic Trouble Codes(DTCs)" mode, and then Press F4(DTAL) to check DTC'sinformation from the DTCs menu
Confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditionsnoted in the freeze frame data or enable conditions noted in the DTC detecting condition.
Read "DTC Status" parameter.
Is parameter displayed "History(Not Present) fault"?
History fault : DTC occurred but has been cleared.
Present fault : DTC is occurring at present time.
▶ Fault is intermittent caused by poor contact in the sensor's and/or ECM's connector or wasrepaired and ECM memory was not cleared. Thoroughly check connectors for looseness,poor connection, bending, corrosion, contamination, deterioration, or damage.Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
▶ Go to "Terminal ＆ Connector Inspection" 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?
▶ Repair as necessary and go to "Verification of vehicle Repair" procedure.
▶ 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?
▶ 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.
▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
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
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?
▶ Go to next step as below.
▶ 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.
After a repair, it is essential to verify that the fault has been corrected.
Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode.
Press F4(DTAL) and confirm that "DTC Readiness Flag" indicates "Complete".
If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.
Read "DTC Status" parameter.
Is parameter displayed "History(Not Present) fault"?
▶ System performing to specification at this time. Clear the DTC.
▶ Go to the applicable troubleshooting procedure.
