Diagnostic Aids

After engine is started, temperature should rise steadily to about 194°F (90°C), and then stabilize when thermostat opens. When a Code 14A is set, ECM will turn on engine cooling fan. Code 14A will set if circuit is shorted to ground. For intermittent inspection, see INTERMITTENTS in TESTS W/O CODES article.

Fig 1: Code 14A - Schematic

Courtesy of ISUZU MOTOR CO.

Fig 2: Code 14A - Diagnostic Flowchart

Courtesy of ISUZU MOTOR CO.