GR8-1291
- Remove the battery filler caps and check the water level. If necessary, add water to the appropriate level. reinstall the caps.
- Attach the small red clamp to the positive battery terminal and the small black clamp to the negative terminal.
- Select the Battery Test icon in the main menu, then press the NEXT key.
- Test the battery by following the on-screen instructions to enter the appropriate information. Refer to the Mazda GR8-1291 instruction manual for more information.
- After the test, the control module displays a battery decision with an analysis in a series of screens. The analysis includes the battery state of health (SOH) and state of charge (SOC). Before the battery test results are displayed, use the keypad on the Control Module to enter the last five digits of the vehicle's VIN and press NEXT to continue.
- The Mazda GR8-1291 will print out the test results and display one of the eight possible results listed below. Review the results and follow the Action Step for the displayed result.
| Battery Tester Display | Action Step |
| GOOD BATTERY | Return the battery to service. |
| GOOD - RECHARGE | Fully charge the battery and return it to service |
| CHARGE & RETEST | Fully charge the battery and retest. Failure to fully charge the battery before retesting may cause false readings. If CHARGE & RETEST appears again after you fully charge the battery, replace the battery. |
| REPLACE BATTERY | A REPLACE BATTERY result may also mean a poor connection between the battery and the vehicle. If you tested the battery using the System test, disconnect the battery cables and retest using the Battery Test before replacing it. |
| BAD CELL - REPLACE | Replace the battery. WARNING: Do not charge the battery. Charging a battery with one or more bad cells could cause an explosion and serious harm to the user. |
| SIDE POST TEST | Test data was inconclusive using the side post. Retest using side post adapters. |
| JUMP START POST | Data was inconclusive using the jump start post. Retest at the battery terminals. |
| 24 VOLT BATTERY | 24-Volt battery detected. You are attempting to test both in-vehicle batteries in a 24-Volt system. Disconnect the batteries and test them individually. |
| WARNING |
| Do not charge the battery. Charging a battery with one or more bad cells could cause an explosion and serious harm to the user. |
GR8-1291 Battery Inspection
Electrolyte Specific Gravity
- Remove the battery filler caps and check the water level. If necessary, add water to the appropriate level.
- Measure the electrolyte specific gravity using a hydrometer. If it is less than the specification, recharge the battery. (See «BATTERY RECHARGING [MZI-3.7]»(ref-663012-S40093072332014101600000) .) Battery electrolyte specific gravity [20°C {68°F}] 1.22-1.29
Battery Voltage
- Inspect the battery as follows after removing the battery filler caps, checking the water level, and adding water to the appropriate level if needed. DIAGNOSTIC PROCEDURE Step Inspection Action 1 Measure the battery positive voltage. 12.4 V or more Go to Step 3. Less than 12.4 V Go to the next step. 2 Quick charge for 30 min and recheck voltage. 12.4 V or more Go to the next step. Less than 12.4 V Replace the battery. 3 Using the battery load tester, apply load current (see battery load test current) and record battery voltage after 15 seconds. Is voltage more than the specification? Yes Normal No Replace the battery. Battery load test current 80D26L (55):195 A Standard specification BATTERY SPECIFICATIONS Battery temp. (°C {°F}) Minimum voltage (V) 4 {39} 9.3 10 {50} 9.4 16 {61} 9.5 21 {70} 9.6
Using GR8-1291
| WARNING | Keep all flames away from the battery, otherwise evaporated gas from the battery fluid may catch fire and cause serious injury. |
- Remove the battery filler caps and check the water level. If necessary, add water to the appropriate level. Reinstall the caps.
- Attach the large red clamp to the positive battery terminal and the large black clamp to the negative terminal.
- Select the diagnostic icon in the main menu, then press the NEXT key.
- Follow the on-screen instructions to input the appropriate information. Refer to the Mazda GR8-1291 instruction manual for more information.
- The GR8-1291 will test and charge the battery. before the diagnostic charging results are displayed, use the keypad on the control module to input the last 5 digits of the vehicle's VIN and press NEXT to continue.
- After the charging is completed, the Mazda GR8-1291 will print out the diagnostic charging results and display one of the following results listed below. Review the results and follow the action step for the displayed result.
| Battery Tester Display | Action Step |
| GOOD BATTERY | Return the battery to service. |
| REPLACE BATTERY | Replace the battery |
| BAD CELL - REPLACE | Replace the battery WARNING: Do not charge the battery. Charging a battery with one or more bad cells could cause an explosion and serious harm to the user. |
| SIDE POST TEST | Test data was inconclusive using the side post. Retest using side post adapters. |
| JUMP START POST | Data was inconclusive using the jump start post. Retest at the battery terminals. |
| WARNING |
| Do not charge the battery. Charging a battery with one or more bad cells could cause an explosion and serious harm to the user. |
Battery Recharging Procedure GR8-1291
Without Using GR8-1291
| WARNING | Keep all flames away from the battery, otherwise evaporated gas from the battery fluid may catch fire, and cause serious injury. Remove the battery filler caps when recharging to prevent battery deformation or damage. |
| CAUTION | Do not quick charge for more than 30 min. It will damage the battery. |
Scheme 7
- Remove the battery and then place it in a pan of water.
- Remove the battery filler caps.
- Connect a battery charger to the battery and adjust the charging current as follows. Battery slow charge current 80D26L (55): 5.5-6.5 A Battery quick charge current [30 min] 80D26L (55): 35 A
- After the battery is recharged, verify that the voltage is within the specification and remains at the same value for 1 h or more after the recharging has been completed. If not within the specification, replace the battery. Standard voltage 12.4 V or more
Generator Warning Light
- Verify that the battery is fully charged.
- Verify that the generator and A/C drive belt is correct. (See «DRIVE BELT INSPECTION [MZI-3.7]»(ref-663015-S40499803102014101600000) .)
- 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.
- Verify that the generator warning light goes out after the engine is started. If it does not go out, inspect if any DTCs are displayed. If any DTCs are displayed, carry out troubleshooting according to the corresponding DTC inspection.
Scheme 8
- Verify that the battery is fully charged.
- Verify that the generator and A/C drive belt is correct. (See «DRIVE BELT INSPECTION [MZI-3.7]»(ref-663015-S40499803102014101600000) .)
- Turn off all electrical loads.
- Start the engine.
- 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.
- 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 A: B+ Terminal RC: Approx. 1 V or less Terminal LI: Approx. 1 V Generator standard voltage [Idle, 20 °C {68 °F}] Terminal B: 12-16 V Terminal A: 12-16 V Terminal RC: 0-16 V Terminal LI: 1-16 V
Current
Note. Since the charging current decreases rapidly after starting the engine, carry out the following procedure quickly, and read the maximum current value.
- Verify that the battery is fully charged.
- Verify that the generator and A/C drive belt is correct. (See «DRIVE BELT INSPECTION [MZI-3.7]»(ref-663015-S40499803102014101600000) .)
- Disconnect the negative battery cable.
- Connect a tester, which can read 120 A or more , between generator terminal B and the wiring harness.
- Connect the negative battery cable.
- Turn off all electrical loads.
- Start the engine.
- 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.
- Turn the following electrical loads on and verify that the current reading increases more than the minimum value indicated below. Headlights (high-beam) Blower motor (HI) Rear window defroster Brake lights Generator generated current minimum value 70 % of the nominal output current (nominal output current: 110 A) [Ambient temp. 20 °C {68 °F}, voltage 13.0-15.0 V, both engine and generator are hot]
Scheme 9
Scheme 10
- Measure the resistance between the slip rings using a tester. If not within the specification, replace the rotor. Generator rotor resistance (between slip rings) [20 °C {68 °F}] 1.8-2.2 ohm
- Verify that there is no continuity between the slip ring and core using a tester. If there is continuity, replace the rotor.
- Inspect the slip ring surface condition. If the slip ring surface is rough, use a lathe or fine sandpaper to smooth it.
Scheme 11
Scheme 12
Scheme 13
- Verify that the continuity is as indicated in the table in the illustration. If there is any malfunction, replace the stator.
- Verify that there is no continuity between the stator coil leads and core using a tester. If there is continuity, replace the stator coil.
Scheme 14
- Inspect brushes for wear. If any brush is worn almost to or beyond the limit, replace all of the brushes. Generator brush length Standard: 22.5 mm {0.89 in} Minimum: 5.0 mm {0.20 in}
Scheme 15
- Measure the force of the brush spring using a spring pressure gauge
- Read the spring pressure gauge at the brush tip projection of 2 mm {0.079 in}. Replace the brush spring if necessary. Generator brush spring force Standard: 4.1-5.3 N {0.42-0.54 kgf, 0.92-1.19 lbf} Minimum: 1.7 N {0.17 kgf, 0.38 lbf}
Scheme 16
Scheme 16: Rectifier (Using an analog circuit tester)
- Inspect for continuity of the diodes using an analog circuit tester. If not as specified, replace the rectifier. Specification CONTINUITY CHART Negative Positive Continuity E P1, P2, P3, P4, P5, P6 Yes B No P1, P2, P3, P4, P5, P6 E No B Yes
Rectifier (Using a digital circuit tester)
- Inspect for continuity of the diodes using a digital circuit tester. If not as specified, replace the rectifier. Specification CONTINUITY CHART Negative Positive Continuity E P1, P2, P3, P4, P5, P6 No B Yes P1, P2, P3, P4, P5, P6 E Yes B No
Scheme 17
- Inspect for abnormal noise, looseness, and sticking. Replace the bearing if necessary.