Generator Inspection; Generator Warning Light; Generator - Mazda CX-7 2007 Workshop Manual

GENERATOR INSPECTION[L3 WITH TC]
Caution
• Do not apply direct battery positive voltage to generator terminal D, otherwise it could cause
damage to the internal parts (power transistor) of the generator.

Generator Warning Light

1. Verify that the battery is fully charged.
2. Verify that the drive belt deflection/tension is correct. (See 01-10-3 DRIVE BELT INSPECTION[L3 WITH TC].)
3. With the ignition switch turned to the ON position, verify that the generator warning light illuminates.
• If it does not illuminate, inspect the generator warning light and the wiring harness.
— If the generator warning light and the wiring harness are normal, inspect the PCM.
4. Verify that the generator warning light goes out after the engine is started.
• If it does not go out, inspect if any one of the following DTCs in the on-board diagnostic system are
displayed: P0112, P0113, P2502, P2503, P2504. (See 01-02-13 DTC TABLE[L3 WITH TC].)

Generator

Voltage
1. Verify that the battery is fully charged.
2. Verify that the drive belt deflection/tension is correct. (See 01-10-3 DRIVE BELT INSPECTION[L3 WITH TC].)
3. Turn off all electrical loads.
4. Start the engine.
5. Verify that the generator rotates smoothly without any noise while the engine is running.
• If there is any noise, find the cause and repair or replace the generator.
6. Measure the voltage at each terminal using a
tester.
• If it is not as specified, find the cause and
repair or replace the applicable part.
Generator standard voltage [IG-ON]
Terminal B: B+
Terminal P: Approx. 1 V or less
Terminal D: Approx. 0 V
Generator standard voltage [Idle, 20 °C {68
°F}]
Terminal B: 13— 15 V
Terminal P: Approx. 3— 8 V
Terminal D: Turn the electrical loads (headlights, blower motor, rear window defroster) on and verify
that the voltage reading increases.
Current
Note
• Since the charging current decreases rapidly after starting the engine, carry out the following procedure
quickly, and read the maximum current value.
1. Verify that the battery is fully charged.
2. Verify that the drive belt deflection/tension is correct. (See 01-10-3 DRIVE BELT INSPECTION[L3 WITH TC].)
3. Disconnect the negative battery cable.
4. Connect a tester, which can read 120 A or more, between generator terminal B and the wiring harness.
5. Connect the negative battery cable.
6. Turn off all electrical loads.
7. Start the engine.
8. Increase engine speed to 2,500 rpm.
Note
• When the electrical load on the vehicle is low, the specified current cannot be verified although the
generator is normal. In this case, increase the electrical load (Leave the headlights turned on for a while,
then discharge the battery, or use a similar method.) and recheck.
• When the generator itself or the ambient temperature are too high, the specified current also cannot be
verified. In this case, cool down the generator and recheck.
01-17–6
CHARGING SYSTEM [L3 WITH TC]
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