Charging System Test No 5 - Alternator Output Too Low (Code 41, Codes 41-47 Or Code 47)
- With tester connected to diagnostic connector, connect voltmeter negative lead to battery negative post. Put system in ATM Test "09". Refer to ENTERING ON-BOARD DIAGNOSTICS in this article. Touch positive lead of voltmeter to each alternator field terminal. If voltmeter reads zero volts at both field terminals, repair Dk. Green (J2) wire for an open circuit to wiring harness splice. If voltmeter reads battery voltage at one field terminal and is pulsating between zero and battery voltage at other field terminal, check for loose alternator drive belt, check alternator, and check battery. If voltmeter reads battery voltage at both field terminals, go to next step.
- Turn ignition off. Disconnect 14-pin connector from SMEC. Connect a voltmeter to Dk. Green wire in cavity No. 14 and ground. Turn ignition on. If voltmeter reads battery voltage, go to next step. If voltmeter reads zero volts, repair Dk. Green wire in cavity No. 14 of 14-pin connector for an open circuit to alternator.
- Turn ignition off. Seperate 14-pin connector. Connect half of 14-pin connector with cavities No. 1 through 7 to SMEC. Connect positive lead of an analog voltmeter to Dk. Green wire in cavity No. 14. Connect negative lead of voltmeter to Dk. Green/Orange wire in cavity No. 11. Put system in ATM Test "09". Refer to ENTERING ON-BOARD DIAGNOSTICS in this article. If voltmeter is pulsating between 0-12 volts, replace SMEC for a bad power board. Before replacing SMEC, ensure terminals in cavities No. 11 and 14 of 14-pin connector are not damaged causing a poor connection. If voltmeter reads zero volts, go to next step.
- Turn ignition off. Disconnect 60-pin connector from SMEC. Connect an ohmmeter between Dk. Green/Orange wire in cavity No. 11 of 14-pin connector and Dk. Green/Orange wire in cavity No. 14 of 60-pin connector. If ohmmeter reads continuity, replace SMEC for a bad logic board. Before replacing SMEC, ensure cavity No. 14 of 60-pin connector is not damaged causing a poor connection. If ohmmeter reads no continuity, repair Dk. Green/Orange wire of 60-pin connector for an open circuit to 14-pin connector.