Trouble Code Explanation

See CHARGING SYSTEM FAULT CODES table for charging-related faults.
Code 12 will set if battery feed to the SBEC-II has been disconnected within last 50-100 starts. SBEC-II monitors this circuit whenever ignition is on.
Code 41 will set if the alternator field control fails to switch properly. SBEC-II monitors this circuit whenever ignition is on.
If battery temperature sense voltage goes out of range, Code 44 will set in memory. SBEC-II monitors this circuit any time ignition is on.
If battery voltage is more than one volt above desired control voltage for more than 20 seconds, a Code 46 will be set in memory. SBEC-II monitors this signal whenever the engine is running.
If battery is more than one volt below desired control voltage for more than 20 seconds, Code 47 will be set. Code 47 will also set if no significant change in voltage is detected during alternator test. The SBEC-II monitors this signal whenever engine speed is more than 1500 RPM.

CHARGING SYSTEM FAULT CODES

Code

Circuit

"CHECK ENGINE" Light Status

Battery Feed to SBEC-II

Off

41 ⁽¹⁾

Alternator Field Control

44 ⁽¹⁾

⁽²⁾ Battery Temp. Sensor

46 ⁽¹⁾

High Battery Voltage

47 ⁽¹⁾

Low Battery Voltage

Off

End of Diagnostic Mode

Off

⁽¹⁾	This code will cause limp-in mode.

⁽²⁾	Sensor inside SBEC-II. If failed, replace SBEC-II.

NOTE: Only charging system-related codes are listed here. For engine-related codes, see appropriate G-TESTS W/CODES article in the ENGINE PERFORMANCE section.