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Chapter 6: System Test
Before starting the test, inspect the alternator drive belt. A belt that is glazed or worn, or lacks the
proper tension, will prevent the engine from achieving the rpm levels needed for the test.
The System Test includes 3 tests that provide a complete diagnosis of the vehicle’s electrical system:
• BATTERY TEST
• STARTER TEST
• ALTERNATOR TEST
The System Test includes the option of using an amp clamp.
You also have the option of viewing or printing the results at the end of each test, or at the end of the
entire test sequence.
Battery Test
The System Test includes a test of the battery to eliminate it as the cause of starting or charging
problems. See Chapter 4 for the Battery Test procedure.
If the EXP determines that the battery needs assistance to start the vehicle, it will prompt you to begin
the Jump Start routine described in Chapter 8.
Starter Test
If you are using the amp clamp, keep it clamped around the negative (–) battery cable.
1. Start the engine at the prompt.
2. The EXP will display one of 1 of 7 starter decisions (Table 2) with the complete results in
a series of screens as shown in Figure 15. Use the UP/DOWN ARROW keys to scroll to
each screen.
To send the results to an IR printer, press the PRINT soft key. To continue testing, press
the NEXT soft key.
NOTE: In some cases, the EXP may not detect the vehicle’s starting prole. It will dis-
play the soft key options STARTED and NO START. If you select STARTED, the EXP will
skip to the alternator test. If you select NO START, the test process ends.
Chapter 6: System Test
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