LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Isuzu >> 1989 >> I-Mark LS >> Repair and Diagnosis >> Engine Performance >> System >> Tests W/Codes - EFI >> Diagnostic Circuit Check >> Code 15 - Coolant Temperature Sensor (Cts) Low Temperature Indicated >> Notes
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Code 15 - Coolant Temperature Sensor (Cts) Low Temperature Indicated: Notes

NOTE: Test numbers refer to test numbers on diagnostic chart.
  1. Checks to see if code was set as result of hard failure or intermittent condition. Code 15 will set if engine has been running for 2 minutes and signal voltage indicates a coolant temperature less than -37°F (-37°C).
  2. This test simulates conditions for Code 14. If ECM recognizes grounded circuit (low voltage) and displays a high temperature, ECM and wiring are okay.
  3. This test will determine if there is a wiring problem or faulty ECM. If circuit No. 452 is open, there may also be a Code 33 stored. Ensure to carefully check terminals at Black engine harness connector.
scientia non olet · About LEMON Manuals