Diagnostic Aids

After engine is started, temperature should rise steadily to approximately 194°F (90°C), then stabilize when thermostat opens. Code 14B will set if circuits No. A11 and D12 are open. Check terminals at sensor for good contact. For intermittent inspection, see INTERMITTENTS in TESTS W/O CODES article in the ENGINE PERFORMANCE Section.

Fig 1: Code 14B Schematic - CTS Circuit (Low Temperature Indicated)

Courtesy of ISUZU MOTOR CO.

Fig 2: Code 14B Flow Chart - CTS Circuit (Low Temperature Indicated)

Courtesy of ISUZU MOTOR CO.