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Engine
Yes
Step 4
Check the generator regulator excitation power supply.
Yes
Replace the generator. Confirm the fault has been fixed.
Step 5
Step 6
Are other instrument lights and indicators working properly?
Yes
Replace the instrument cluster. Refer to
Step 7
Step 8
Check the instrument power circuit and ground circuit. Refer to
Next
Step 9
Diagnostic completed.
2.11.7.8 Generator Noise Diagnosis
Diagnostic Tips:Generator noise may be caused by electrical or mechanical noise. Electrical noise (electromagnetic hum sound) is
usually added to the generator with the electrical load changes, which is the normal operating characteristics of all generators. During
the service, pay attention to distinguish, otherwise it will cause unnecessary customer complaints. When diagnose the generator
mechanical noise, firstly check whether there are loose generator components or interference. In some cases even if the sound in
engine compartment is light, it can enter into the passenger compartment. If this is the case, replacing the generator does not solve
the problem, which leads to misjudgments.
Keep the generator not working, and confirm whether the noise disappears.
Step 1
Starting / Charging System JL4G18-D
No
Refer to
2.11.7.6 Charging Indicator Always
Confirm the fault has been fixed.
No
No
12.8.3.1 Instrument Panel
11.7.6.7 DTC U129C
(a)
Start the engine, verify that the noise can be heard.
(b)
Shut down the engine.
(c)
Disconnect the generator from the generator on the wiring
harness connector EN07.
(d)
Start the engine.
Confirm whether the noise disappears?
Yes
EC718/EC718RV EC715/EC715RV 10/2009
The generator regulator power circuit is open.
Repair the faulty part. Confirm the fault has
been fixed.
OnStep 5.
Refer to
2.11.7.6 Charging Indicator Always
OnStep 6
Go to step 8
Replacement.
U129D.
Go to step 6
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