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STATES |
DETAILS/RESULTS/ACTIONS |
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A1: CHECK THE BATTERY |
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1Perform a Battery Capacity Test with FDS 2000 |
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• Is the battery OK? |
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→ Yes |
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Go to A2 Proceed to PINPOINT TEST A |
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→ No |
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INSTALL a new battery. CHECK that the system is operating correctly. |
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A2: CHECK FUSE 10 (10A) |
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1CHECK Fuse 10 (10A) in the battery junction box. |
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• Is fuse 10 (10 A) good? |
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→ Yes |
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Go to A3 Proceed to PINPOINT TEST A |
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→ No |
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INSTALL a new 10A fuse. CHECK the system for proper operation. If the problem persists, check for a short to ground. |
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A3: CHECK THE CHARGING SYSTEM |
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1Perform a Charge Test using the FDS 2000. |
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• Is the generator output power normal? |
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→ Yes |
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DIAGNOSE the charging system warning lamp. Refer to Section 413-01 for additional information. |
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→ No |
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Go to A4 Proceed to PINPOINT TEST A |
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A4: CHECK GROUNDING |
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1Enter the ON position. |
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2Measure the voltage between the generator case and the negative battery terminal. |
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• Is the voltage less than 0.5V? |
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→ Yes |
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Go to A5 Proceed to PINPOINT TEST A |
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→ No |
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CLEAN and TIGHTEN the alternator mount, engine ground strap to the chassis, and battery ground cable. CHECK for proper system operation. If the problem persists, INSTALL a new battery ground cable. |
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A5: CHECK BATTERY WIRE |
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1Enter the ON position. |
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2Measure the voltage between the B+ terminal of the generator and the positive terminal of the battery. |
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• Is the voltage less than 0.5V? |
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→ Yes |
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Go to A6 Proceed to PINPOINT TEST A |
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→ No |
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CLEAN and TIGHTEN the battery cable hardware. CHECK for proper system operation. If problem persists, INSTALL a new battery cable. |
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A6: CHECK THE BATTERY POWER SUPPLY TO THE GENERATOR |
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1Measure the voltage between the B+ pin of the generator, electrical circuit 30-BA6 (red), and ground. |
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• Is the voltage equal to the battery voltage? |
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→ Yes |
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Go to A7 Proceed to PINPOINT TEST A |
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→ No |
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REPAIR circuit 30-BA6 (red) or circuit 50-BB10 (red). CHECK for proper system operation. |
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A7: CHECK THE CURRENT SUPPLIED TO THE GENERATOR REGULATOR |
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1Enter the OFF position. |
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2Disconnect the Generator - C870. |
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3Measure the voltage between pin 3 C870 of the generator, circuit 30-BA10 (red), harness side, and ground. |
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• Is the voltage more than 10V? |
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→ Yes |
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Go to A8 Proceed to PINPOINT TEST A |
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→ No |
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If fuse F10 is good, REPAIR circuit 30-BA10. CHECK for proper system operation. |
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A8: CHECK POWERTRAIN CONTROL MODULE AND GENERATOR COMMUNICATION CIRCUIT |
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1Connect the Generator - C870. |
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2Connect the diagnostic tool.FDS 2000 |
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3Enter the ON position. |
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4Retrieve PCM diagnostic trouble codes (DTCs). |
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• Are any DTCs issued? |
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→ Yes |
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Use FDS 2000 to diagnose PCM and communication components. |
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→ No |
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REPAIR or INSTALL a new alternator. CHECK that the system is operating correctly. |
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PINPOINT TEST B: RADIO INTERFERENCE
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STATES |
DETAILS/RESULTS/ACTIONS |
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B1: ISOLATE THE GENERATOR |
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1Remove the accessory drive belt. Refer to Section 303-05 for additional information. |
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2Enter the ON position. |
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3Run the engine for a few seconds with the radio on. |
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• Does the interference persist? |
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→ Yes |
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For additional information, see Section 415-00. |
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→ No |
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CLEAN and TIGHTEN all support points and electrical fittings, power and ground wires. CHECK for proper system operation. If interference persists, INSTALL a new alternator. |
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