Charging System

Charging Circuit Troubleshooting (cont'd)


  1. Start the engine. Hold the engine at 3,000 rpm (min-1) with no load (in Neutral) until the radiator fan comes on then let it idle.
  2. Raise the engine speed to 2,000 rpm (min-1) and hold it there.
  3. Turn the headlights (high beam) on, and measure voltage at the under-hood fuse/relay box terminal.

Is the voltage between 13.9 and 15.1 V?

YES - Go to step 9.

NO - Repair the alternator components (see page 4-29).

  1. Read the amperage at 13.5 V.

NOTE: Adjust the voltage by turning the blower motor, rear window defogger, brake lights, etc. ON.

Is the amperage 60A or more?

YES - Alternator/regulator operation is OK.

NO - Repair the alternator components (see page 4-29).

Alternator Control System Test

  1. Check for proper operation of the ELD by checking the MIL (see page 11-3).
  2. Disconnect the engine wire harness 6P connector from the starter sub-harness 6P connector.
  3. Start the engine, and turn the headlights (high beam) ON.
  4. Measure voltage between the engine wire harness 6P connector terminal No. 2 and the positive terminal of the battery.



Wire side of female terminals

Is there 1 V or less?

YES - Go to step 8.

NO - Go to step 5.

  1. Turn the headlights and ignition switch OFF.
  2. Disconnect ECM connector B (24P).